Tank Hydrostatic Test Specification CQS001-2006 - A4A1F1

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Tank Hydrostatic Test SpecificationCQS001 - 2006

Revision: 0Prepared By: Vincent ChouApproval Date: August 11, 2006

Copyright © 2006 Enbridge Pipelines Inc., All Rights Reserved

Construction Quality Specification

Enbridge Pipelines Inc.

Enbridge Energy Partners L.P.



TANK H YDROSTATIC TEST SPECIFICATION CQS001 – 2006

Copyright ©© 2006 Enbridge Pipelines Inc. All rights reserved Page iConstruction Quality Specification – CQS001 (2006)

Table of Contents1

Scope ............................................................................................................................ 1

2 Regulations, Codes And Standards........................................................................... 1

2.1

NEB Regulated Facilities..........................................................................................1

2.2

Other Authorities Having Jurisdiction ....................................................................2

3

Personnel...................................................................................................................... 2

3.1

Test Supervisor .........................................................................................................2

3.2 Alternate Test Supervisor ........................................................................................2

3.3

Testing Personnel .....................................................................................................2

4 Test Medium .................................................................................................................2

5 Test Duration, Tank Fill Rate And Liquid Level ........................................................3

6 Tank Preparation.......................................................................................................... 3

7

Test Materials ............................................................................................................... 4

8

Safety Precautions....................................................................................................... 5

9

Survey And Inspection Requirements ....................................................................... 5

9.1 Survey Prior To Filling The Tank.............................................................................6

9.2

Survey During Filling The Tank ...............................................................................7

9.3

After Completion Of The Test ..................................................................................7

10 Environmental - Water Draw And Disposal ...............................................................8 10.1 Pre-test Preparation ..................................................................................................8

10.2

Source/Withdrawal....................................................................................................9

10.3

Location .....................................................................................................................9

10.4

Discharge...................................................................................................................9

10.5 Water Additives/Saline Test Water ........................................................................10

11

Contingency Plans..................................................................................................... 10

12

Standards Of Acceptability ....................................................................................... 10

12.1 Tank Shell ................................................................................................................10

12.2

Tank Floor................................................................................................................10

12.3 Rolling Ladder .........................................................................................................10

12.4 Floating Roof ...........................................................................................................11

12.5

Tank Foundation .....................................................................................................11

13 Tank Strapping........................................................................................................... 11

14 Records....................................................................................................................... 11

Appendix I - Tank Hydrostatic Test Procedure Checklists............................................ 13 A1.1

Test Planning and Preparation Procedure............................................................14

A1.2

On-Site Test Preparation Procedure .....................................................................15




Copyright ©© 2006 Enbridge Pipelines Inc. All rights reserved Page iiConstruction Quality Specification – CQS001 (2006)

A1.3

Tank Filling Procedure and Hydrostatic Test Procedure ....................................16

A1.4

Tank Emptying and Test Completion Procedure .................................................18

Appendix II - Hydrotest Permit Request Form................................................................. 19

Appendix III - Above Ground Tank Hydrostatic Test Report.......................................... 21




Copyright ©© 2006 Enbridge Pipelines Inc. All rights reserved Page 1Construction Quality Specification – CQS001 (2006)

1 Scope

Industry standards and government regulations require that new tanks undergo a hydrostatictest before being placed into service to ensure the integrity of the tank, floating roof, foundation,

and appurtenances.Oil tanks that undergo alterations, repair work or reconstructive work may require a hydrostatictest prior to being placed back into service.

The purpose of this document is to provide procedures to safely conduct a tank hydrostatic teston newly constructed tanks and tanks that have previously been in service.

2 Regulations, Codes And Standards

This hydrostatic test specification is in accordance with the latest edition of the followingregulatory and industry standards:

API Std 650 Section 5.3Welded Steel Tanks for Oil Storage

API 653 Section 12 and Appendix BTank Inspection, Repair, Alteration and Reconstruction

CFR 49CFR Part 195, Section 195.307Code of Federal Regulations (Pipeline Safety): Part 195 Transportation of Hazardous Liquids byPipeline

CSA Z662Oil and Gas Pipeline Systems

NEB OPR Part 5National Energy Board Onshore Pipeline Regulations

NFPA 30 Section 4.4Flammable and Combustible Liquids Code

OH&S (CDN)Canadian Centre for Occupational Health and Safety

Applicable Environmental Regulations

Enbridge Environmental Guidelines for Construction

2.1 NEB Regulated Facilities

An NEB notification of hydrotest may be required. Records previously associated with the NEB

notification are still required to be created for the Company files; see the section on Records.

The Board Order Certificate issued by the NEB for the project may contain additional testing ornotification requirements and shall be reviewed during test planning. The Test Supervisor shallincorporate additional requirements into the test procedures.





2.2 Other Authorities Having Jurisdiction

Local authorities should be consulted to determine if there are any additional testingrequirements.

3 Personnel

3.1 Test Supervisor

A Test Supervisor is required for all tank hydrostatic testing. The Test Supervisor is responsiblefor planning and supervising the hydrostatic test.

The Test Supervisor shall be independent of the contractor undertaking the hydrostatic test andshall be adequately qualified to fulfil the responsibilities.

3.2 Alternate Test Supervisor

An alternate Test Supervisor, as designated by the Test Supervisor, will be required for tank

hydrostatic tests.

3.3 Testing Personnel

Testing Personnel must have demonstrated qualifications. A qualified third party contractor,company personnel or a combination of both may be retained to conduct the hydrostatic test ofthe tank.

Testing Personnel shall perform all testing functions set forth by the Testing Supervisor that mayinclude, but are not limited to:

a) isolation of piping;

b) filling the tank;c) surveying;

d) leak checks;

e) pontoon checks;

f) ladder checks;

g) foundation checks;

h) draining the tank;

i) compliance with testing and discharge regulations;

j) test documentation.

4 Test Medium

Domestic raw water (free of chlorine, etc.) is the preferred test medium although other sourcesmay be used (i.e. lake water, river water, well water). Alkaline water shall not be used as a testmedium. Laboratory tests of the water shall be performed prior to use with the results found tobe satisfactory to the Testing Supervisor and the Environment Department.





Additives shall not be used unless approved by the Environment Department. If additives areapproved for use a list of the additives used and the reasons for using them shall be included inthe testing documentation.

The volume of water required for the test is substantial; a suitable source for the water and adisposal site must be identified early on in the test planning to avoid delays.

5 Test Duration, Tank Fill Rate And Liquid Level

The Test Supervisor shall verify that the test height of water in the tank is the maximum designliquid level from the tank datasheets. The tank is to be filled up to the maximum design liquidlevel and held for a minimum of 24 hours. A longer duration may be required for additionalsettling time and stabilization of the foundation, as well as additional time for the floating roofdeck to dry off from rainfall for inspection.

Any welded joints above the test-water level shall be examined by:

a) painting the joints on the inside with a highly penetrating oil and carefully examining theoutside of the joints for leakage, or

b) applying vacuum to either side of the joints and carefully examining the joints for leakage,or

c) using any combination of the above two methods.

Repairs of defects discovered after the tank has been filled with water for testing shall be madewith the water level at least 0.3 m (1 ft) below any point being repaired or, if repairs have to bemade on or near the tank bottom, with the tank empty. Welding shall not be done on any tankunless all connecting lines have been completely blinded.

The maximum tank fill rate shall be the lesser of:

a) the maximum tank fill rate specified by the tank manufacturer (typically shown on the tankfabrication and erection drawings);

b) the maximum water draw rate specified on the environmental permits; and

c) a rate that allows for adequate inspection time and uniform loading during the filling processas determined by the Test Supervisor.

The test height of the water and the maximum tank fill rate shall be documented on theHydrotest Permit Request and the Test Reports.

6 Tank Preparation

The hydrostatic test shall be conducted prior to the installation of an internal lining.

The tank shall be internally cleaned prior to the hydrostatic test to ensure that the test waterdoes not become contaminated. Diesel or penetrating oil, sometimes used during the tankerection to test the shell or floating roof welds, can contaminate the test water. Steam cleaningis sometimes required if excessive amounts of diesel have been used. Also, excessive millscale, rust, welding flux and other debris can contaminate the water and should be removedfrom the tank prior to filling.

For new tanks, it is typically the tank erection contractor's responsibility to clean the tank at thecompletion of tank erection. The Test Supervisor shall inspect the tank to ensure the tank is





clean prior to filling. For previously in-service tanks, the test supervisor is responsible to ensurethe tank is clean prior to filling.

All welding on the tank shell and floating roof as well as all tank shell and floating roofinspections required by API Std 650 and/or API 653 shall be completed before the hydrostatictest can begin. Prior to commencing with the test the Company's Tank Inspector shall provide

written confirmation that these inspections have been completed with satisfactory results andthat the tank is ready for hydrostatic testing.

For existing tanks, all existing permanent external piping shall be disconnected and blinded offprior to the test.

For new tanks, hydrostatic testing shall be completed prior to connecting any permanentexternal piping to the tank.

The floating roof man-way covers shall be bolted or soft-bolted in place. At the discretion of theTest Supervisor, one pontoon man-way may be left accessible (with the cover on) to allow easyaccess for dipping the tank to monitor water level or to use absorbent to mop up trace amountsof oil or other contaminants from the top of the water. Gauge hatches and vacuum breakervents may also be used for these purposes.

The floating roof pontoon inspection hatches shall be placed over the openings, with thelockdown mechanisms not secured, to allow for easy visual inspection of the pontoons’ interiors.

The floating roof seal should be completely installed prior to the tank hydrostatic test.

Note: There is a risk of seal damage when conducting a cold weather hydrostatic test as theseal can freeze to the tank shell. In this case the Test Supervisor may elect to have thecontractor install the seal after the hydrostatic test.

7 Test Materials

The Test Supervisor shall decide which test materials will be supplied by the Company and

which test materials will be supplied by the Testing Contractor. Generally, the followingmaterials will be required:

a) Pressure Gauges;

b) Survey Instruments (Contractor);

c) Blind flanges, bolts and gaskets;

d) Water pump;

e) Flow meter;

f) Temporary piping;

g) Pressure test reports;

h) Lubrication for rolling ladder bearings;

i) Measuring rod or steel tape of sufficient measuring length to reach bottom of tank from topof deck while it is on high legs;

j) Thermometer to measure air temperature;

k) Thermometer to measure water temperature;

l) Measuring tape;





m) Plumb Line;

n) Flashlight;

o) Lighting facilities for tank lot area as well as the floating roof area;

p) Water sampling containers;

q) Squeegees or other such equipment to mop out water from tank upon completion of test;

r) Erosion protection materials - depends upon the particular circumstances of the waterdischarge; and

s) Heater units and/or hoarding for exposed pipe during winter testing.

t) Four foot level used to check pontoon to shell clearance.

8 Safety Precautions

For Company Personnel, safety procedures for entry into the tank and tank lot area shall be inaccordance with the Company’s Operating, Maintenance and Procedures Manual.

For Contractors, safety procedures for entry into the tank and tank lot area shall be inaccordance with the Company’s Contractor Safety Manual (Canada) or the ContractorsConstruction Safety Program (U.S.).

Procedures shall be reviewed with local Operations Safety Representatives prior to the test.

9 Survey And Inspection Requirements

Due to the substantial load imparted on the tank foundation by the tank shell and contents tanksettlement will occur. It is critical to measure this tank settlement and evaluate whether it isacceptable or whether remedial action is required to assure tank integrity.

During the design phase of new tank construction or remedial work on existing tanks, an initialreport documenting the calculated maximum allowable settlement values per API 653 AppendixB shall be supplied to the Engineering Department Contact by an API 653 certified TankInspection Consultant as per D08-100 and EES68. Prior to the start of the hydrostatic test, thisreport shall be transmitted by the Engineering Department Contact to the Test Supervisor. TheTest Supervisor shall then review the settlement limits on the report with the Tank InspectionConsultant. Before, during, and after the hydrostatic test, the Test Supervisor shall ensure thatthe Tank Inspection Consultant monitors tank foundation settlement and collects all survey data,conducting assessments per API 653 Appendix B as necessary. If, at any time, the measuredfoundation settlement values are greater than the calculated maximum allowable settlementvalues, the Test Supervisor shall immediately suspend the hydrostatic test and notify theEngineering Department Contact. The Engineering Department Contact, Test Supervisor, TankInspection Consultant, and a qualified Geotechnical Engineering Consultant shall thencollaborate to assess the situation. Only after the assessment and any required remedialactions have been completed can the test be resumed.

After a tank is constructed, a base line of survey data shall be collected prior to, during and afterthe tank hydrostatic test. Each time the tank is re-hydrotested the tank shall be re-surveyed priorto, during and after the hydrostatic test to compare with the base line data. It is the responsibilityof the Test Supervisor to ensure that all of the necessary survey data is collected by the TankInspection Consultant. Included below are the minimum survey requirements that shall be met.





For previously in-service tanks, the scope of surveying required prior to, during and after thetank hydrostatic test depends upon the remedial work performed on the tank and foundation. Ifextensive foundation repair work was performed, it is recommended that the Test Supervisordiscuss the survey scope of work with the Tank Inspection Consultant, Engineering DepartmentContact, and Geotechnical Engineering Consultant to determine if additional surveys should be

performed.It is critical to ensure that an appropriate survey benchmark monument is used (to allow surveyrepeatability over time) and that the same benchmark and tank survey points are used in thesubsequent survey inspections. Buildings and equipment shall not be used as surveybenchmarks. If the existing base line data does not meet the requirements of these procedures(i.e., inappropriate locations or insufficient data points) the scope of the survey shall beexpanded to include survey points required by these procedures as well as the base line surveypoints.

9.1 Survey Prior To Filling The Tank

Measurements shall be made by the Tank Inspection Consultant in the annular plate region

(immediately adjacent to the shell) at a maximum of 9.75 m (32 ft.) intervals around the tankshell. The recommended number of survey stations, as a function of tank diameter, is shown inthe table below:

Tank Diameter, D No. of Stations, N

(ft) (m)

D≤80 D≤24.4 8

80<D≤120 24.4<D≤36.6 12

120<D≤160 36.6<D≤48.8 16

160<D≤200 48.8<D≤61 20

200<D≤240 61<D≤73.2 24

240<D≤280 73.2<D≤85.3 28

280<D≤320 85.3<D≤97.5 32

320<D≤360 97.5<D≤109.7 36

360<D≤400 109.7<D≤121.9 40

The arc length (L) between stations for specific diameters can then be calculated by theformula:

L= π DN

The separation of the floating roof pontoons from the tank shell shall be measured anddocumented. This may be accomplished by plumbing up from the outer rim of the pontoons toabove the foam dam where the distance to the shell can then be measured. The separationshall be within the prescribed limits for the tank roof seal design. This data will serve as baselinedata for monitoring during filling the tank.

Check the tank for plumb. Four readings at 90 degrees separation around the tank are required.If considerable discrepancies arise, a total of eight readings at 45 degrees separation may betaken.





9.2 Survey During Filling The Tank

The separation between the tank shell and the floating roof shall be monitored throughout thefilling of the tank to assure that the separation is within the correct dimensional tolerancesthroughout the range of floating roof travel.

The Test Supervisor shall monitor the tank filling rate to ensure it is not exceeding the limitstated on the permits.

Filling of the tank shall be interrupted and the annular plate shall be re-surveyed by the TankInspection Consultant as follows:

a) At approximately the one quarter full level;

b) At approximately the half full level or the three-quarters full level; and

c) Once the tank level has reached the maximum design liquid level.

After each survey the settlement values must be calculated and evaluated before thehydrostatic test proceeds. If any prior geotechnical surveys or reports indicate potentialsettlement problems, the Test Supervisor may elect to have annular plate re-surveys conductedat additional fill levels.

9.3 After Completion Of The Test

The annular plate shall be re-surveyed by the Tank Inspection Consultant as follows:

a) At the completion of the 24 hour test, prior to removing the water from the tank; and

b) Once the water has been completely removed.

After each survey the settlement values must be calculated and evaluated.

The Test Supervisor shall monitor the tank de-watering rate to ensure it is not exceeding thelimit stated on the permits.

Once the tank has been de-watered the tank bottom internal elevation measurements shall betaken as described below:

The measurements shall commence at the tank shell and proceed inward along equally spacedtank diameter axes. The number of tank axes shall be half the number of stations as describedin the Survey Prior To Filling The Tank section of this specification. Elevations shall be takenevery 300 mm (1 ft.) within 3 m (10 ft.) of the tank shell and then every 3 m (10 ft.) across thediameter of the tank thereafter.

The tank plumb shall be re-checked at the same locations as previously surveyed.

After all data has been collected and evaluated, the Tank Inspection Consultant shall submit tothe Test Supervisor five copies of a detailed report containing survey data and associated





drawings, an analysis of the data, an assessment and associated drawings of tank foundationsettlement per API 653 Appendix B, and a description of any corrective actions taken. Fivecopies of a summary report stating the acceptability of the settlement values shall also besubmitted. The Test Supervisor shall forward the reports as per the requirements of the Recordssection of this specification.

10 Environmental - Water Draw And Disposal

10.1 Pre-test Preparation

The Test Supervisor shall complete the Hydrotest Permit Request and submit it to the Safetyand Environment Department (Canada) at least 10 weeks before the scheduled date of the testand the Environment Department (U.S.) at least 26 weeks before the scheduled date of the test.

The Environment Department is responsible for obtaining the necessary water appropriationand discharge permits and/or approvals for the test.

The Environment Department is responsible for notifying the applicable authorities about the

hydrostatic test. The Environment Department may wish to delegate this task to the TestSupervisor; in this case the Environment Department shall provide the Test Supervisor with alist that details:

a) all required notifications;

b) necessary lead time for each notification;

c) information that is required to be submitted with the notifications; and

d) contact names and addresses.

It shall be the responsibility of the Test Supervisor with input and assistance of the EnvironmentDepartment to determine:

a) primary and secondary sources of test water;

b) volume of water needed;

c) proposed withdrawal rate;

d) proposed screen size on the water intake;

e) method of transporting the water to site;

f) primary and secondary discharge locations;

g) rate of discharging the water;

h) method of water treatment if required; and

i) discharge/erosion control measures.

This information shall be included on the Hydrotest Permit Request form, the Test Proceduresand the Test Reports.

The Environment Department shall be notified immediately of any changes or additions to theinformation on the permit request form, or to accommodate an expedited schedule for permitrequests.

The Environment Department shall provide a Confirmation Memo to the Test Supervisor statingthat all permits and approvals have been received and that the test can proceed. Copies of the





permits and approvals complete with supplementary conditions for testing shall be attached tothe Confirmation Memo.

After approvals are obtained, the test practices with regards to environmental permit conditionsshall not be changed without written permission from the Environment Department.

Amendments to the proposed testing plan may be required based upon conditional permits andapprovals. The water draw and water disposal procedures can only be finalized once thepermits and approvals are received from the Environment Department and the conditionsincorporated into the test procedures.

10.2 Source/Withdrawal

Follow all conditions outlined in the withdrawal permit.

When planning the test, consider utilizing, where possible, alternatives to natural bodies ofwater as a source of hydrostatic test water such as municipal water supplies or industrial watersupplies at plants or refineries.

Avoid using water bodies with known environmental sensitivities.

Ensure withdrawal sources have sufficient quantity and quality of water required for testingpurposes. Avoid use of highly saline sources of water if practical.

Do no exceed permitted withdrawal rates, nor 10% of the flow or volume of the water sourceunless otherwise approved by authorities having jurisdiction.

Screen intakes in order to minimize intake of debris and organisms (this may be regulated withinthe withdrawal permit).

Test source water quality in accordance with permits as required and provide the EnvironmentalDepartment with lab results well in advance of water withdrawal.

The test water is typically tested prior to filling, during filling and as soon as the tank is full or

prior to disposal to demonstrate that the water has not been contaminated. The EnvironmentDepartment shall give direction as to the frequency of sampling, testing protocol, third partysampling companies, and laboratories for analysis.

10.3 Location

Only withdraw from approved locations.

Avoid locating water withdrawal/discharge sites on steep slopes, muskegs or other sensitiveareas.

10.4 Discharge

Follow all conditions outlined in the discharge permit.

During pressure testing, discharge water only at approved locations.

Locate dewatering sites:

a) downstream of municipal water intakes, or

b) upstream of municipal water intakes at a distance approved by regulatory authorities.

If possible, discharge the source water within the same watershed from where it was withdrawn.





Discharge water must not be more than 2°C (4°F) warmer or cooler than a receiving body ofwater if the receiving body of water supports sport fish. If the potential exists for a temperaturechange that exceeds these limits, contact the Environment Department.

Dewater the tank in such a manner that prevents soil erosion and damage to the beds andbanks of water bodies. Use low velocities, dissipate water energy and utilize protective riprap,

sheeting, tarpaulins or equivalent to prevent washouts, flooding or erosion.

Undertake representative sampling and obtain a laboratory analysis of discharge test water andobtain soil chemistry analysis, if required, prior to discharging on land.

Note: Other requirements for water discharge are handled on a project specific basis. For moreinformation, contact the Environment Department.

10.5 Water Additives/Saline Test Water

The Environment Department must approve any additives to test water before use. Avoid orminimize the use of additives, although non-toxic, biodegradable, or photodegradable additivesat minimum dosages may be permitted with regulatory approval.

Recover all methanol, ethylene glycol and water contaminated by freezing depressants in tanks.Do not allow contaminants to enter natural bodies of water or soils.

Dispose of contaminated test water at approved sites/facilities.

11 Contingency Plans

To minimize the effects of a leak during testing the Test Supervisor shall prepare contingencyplans to:

a) deal with component failure;

b) contain and recover the test medium or any other leaks or spills;

c) dispose of any contaminated material; and

d) notify appropriate environmental agencies.

12 Standards Of Acceptability

12.1 Tank Shell

The tank shell shall exhibit no leaks. The tank shell shall remain within the dimensionaltolerances of API Std 650 or as set forth by the Test Supervisor, which ever is more stringent.

12.2 Tank Floor

The tank floor shall exhibit no leaks. The leak detection sump, if installed, shows no sign ofleaks.

12.3 Rolling Ladder

The rolling ladder shall be true and freely roll on the guide rails for the complete length of travel.





12.4 Floating Roof

The floating roof shall be dry at the time of inspection during the hydrotest and exhibit no leaks.The appearance of a damp spot on the upper side of the lower deck shall be consideredevidence of leakage. If it is raining during the filling or the 24 hour hydrotest hold time, the hold

time may be extended until the deck dries off for inspection.The interior of the pontoons shall be inspected with no evidence of leaks.

The floating roof maintains the tolerances as specified in API Std 650 and does not bind on theguide poles throughout the full operating range, while filling and emptying the tank.

The floating roof drainpipe and hose systems of primary drains shall be pressure tested withwater at a pressure of 350 kPa (50 lbf/in.2) gauge prior to the tank hydrostatic test. For newtanks, the tank fabrication and erection contractor or the floating roof fabrication contractortypically completes this test. The Test Supervisor shall confirm that this test has been completedprior to starting the tank hydrostatic test. For previously in-service tanks the Test Supervisorshall determine whether a re-test of this piping is necessary.

The Test Supervisor shall verify the requirements of the floating roof drain manufacturer andensure that they are satisfied. Unless specified otherwise by these requirements, the floatingroof drain line valve shall be left in the open position during the tank hydrostatic test and nowater shall be evident coming out of the drain line.

12.5 Tank Foundation

Settlement of foundation shall remain within the specified tolerances.

13 Tank Strapping

Typically, a tank is strapped after the test and internal lining installation. Refer to the company

Tank Strapping Specification available through the Engineering Standards department.

14 Records

The following documents shall be compiled/created throughout the tank hydrostatic testprocedures.

a) Tank drawings that must, as a minimum, identify:

i) where the tank was isolated or blind flanged;

ii) location of fill and drain nozzles;

iii) types, grades, sizes and rating of fittings and valves attached to tank;

iv) elevation profile of tank;

v) thickness and grades of tank shell;

vi) maximum design liquid level; and

vii) nominal volume.

b) Signed copy of the Procedures certifying that the steps have been completed;

c) Signed copy of the Above Ground Tank Hydrostatic Test Report;





d) Copy of the Hydrotest Permit Request form;

e) Copy of the environmental permits and approvals;

f) Copy of water test sampling results;

g) Confirmation Memo from Environment Department;

h) Copy of the initial design-phase report from the Tank Inspection Consultant documentingcalculated maximum allowable settlement values per API 653 Appendix B;

i) Copy of a detailed report from the Tank Inspection Consultant containing survey data andassociated drawings, an analysis of the data, an assessment and associated drawings oftank foundation settlement per API 653 Appendix B, and a description of any correctiveactions taken;

j) Copy of a summary report from the Tank Inspection Consultant stating the acceptability ofthe settlement values;

k) Written description and drawing of the tank roof measurements during fill and de-wateringand any corrective actions taken; and

l) Written description of any other issues associated with the tank hydrostatic test and anycorrective actions taken.

The Test Supervisor shall ensure that a copy of this information is filed with the RegionalOperations Office. Three additional copies shall be forwarded to the Engineering DepartmentContact who shall review the information and forward one copy to the Engineering Library, onecopy to the Environment Department, and one copy to the Facilities Integrity EngineeringDepartment.





Appendix I - Tank HydrostaticTest Procedure Checklists





A1.1 Test Planning and Preparation Procedure

This procedure generally covers the minimum requirements for the planning and preparation foran oil tank hydrostatic test.

ACTION: ACTION B Y: CHECK

1. Fill out the Hydrotest Permit Request Form and submit to the EnvironmentDepartment.

2. Compile the Tank Drawings.

3. Review the project's Board Order Certificate and modify these proceduresas required to meet any additional or more specific requirements.

4. Contact the Engineering Department Contact to review the scope of work,procedures, the requirements of API 650, API 653, and the calculatedmaximum allowable tank foundation settlement values.

5. If the Tank Inspection Consultant from the tank design phase has not beenretained, hire a new one.

6. Review the calculated maximum allowable tank foundation settlementvalues with the Tank Inspection Consultant.

7. Hire a strapping contractor (if applicable).

8. Hire a testing contractor.

9. Coordinate with the Environment Department to hire water testing andwater treatment services if needed.

10. Make arrangements or verify that arrangements have been made for thetank and floating roof to be cleaned in preparation for the hydrostatic test.

11. Designate an Alternate Test Supervisor.

12. Obtain the necessary test materials.

13. Ensure receipt of the Confirmation Memo from the EnvironmentDepartment.

14. Review conditions of the permits and approvals, modify these proceduresas required to meet any additional or more specific requirements.

15. Develop the required contingency plans with input from the Environmentdepartment, Regional Office and local Operations personnel.

Test Supervisor Leader Sign-Off Date





A1.2 On-Site Test Preparation Procedure

This procedure generally covers the pre-test steps and requirements in preparation for thehydrostatic test.


1. The Test Planning and Preparation Procedure has been completed.

2. Meet with site operations personnel to review procedures.- Safety procedures.- Environmental protection measures.- Testing procedures.

3. Kick off meeting with testing contractor- Review permit requirements and other environmental requirements.- Review contingency plans.- Review safety requirements and procedures.- Review tank filling procedure and contractors specific plans to transport

water to site.

4. Ensure that the tank is clean of debris and other material and chemicalsthat could contaminate the water.

5. Blind off and bolt up the tank nozzles and all inspection/access doors withthe exception of the nozzle to be used during filling.

6. If so required, confirm that the floating roof drainpipe and hose systems ofprimary drains have been pressure tested with water at a pressure of 350kPa (50 lbf/in.2) gauge.

7. Ensure roof drain valve is installed. Verify the requirements of the drainmanufacturer and ensure that they are satisfied. Unless specified otherwiseby these requirements, ensure the roof drain valve is left in the openposition to allow for monitoring of the roof drain line during hydrostatic test.

8. Ensure that the floating roof man-way covers are bolted or soft-bolted inplace. At the discretion of the Test Supervisor, one pontoon man-way maybe left accessible (with the cover on) to allow easy access to the test water.

9. Ensure that the floating roof pontoon inspection hatches are installed withlockdown mechanisms not secured.

10. Confirm that all survey work required prior to filling the tank is complete.

11. Obtain approval from the Company's Tank Inspector stating that all workand inspection required prior to testing has been successfully completed.

12. Lubricate rolling ladder bearings.

13. Mark the inside of the tank at 1-foot intervals above floating roof pontoonsnear guide pole to allow for easy tracking of the fill rate. (Suggested, NotRequired)

14. Ensure roof vents are open and operable. Ensure that the 1 ½” or 2” valveson the top of the suction/fill nozzles are open. They will stay open until thewater level in the tank reaches their level. The suction/fill piping will want tofloat otherwise if the air is not bled off.






A1.3 Tank Filling Procedure and Hydrostatic Test Procedure

This procedure generally covers the steps required for filling the tank and inspection activitiesduring filling.


1. The On-Site Test Preparation Procedure has been completed.

2. Review permits and ensure that all requirements have been included in thefinal procedures.

3. Prepare the Above Ground Tank Hydrostatic Test Report.

4. Take water samples for testing in accordance with permits as required.Results from water analysis shall be reviewed and found to be acceptableprior to proceeding.

5. The Test Supervisor (or alternate) is to be on site monitoring the filling of

the tank at all times.

6. Commence filling:

The Test Supervisor shall stop the filling of the tank immediately if a leak isdetected or tank foundation settlement exceeds the acceptable limits.Repairs shall be completed in accordance with API 650 and API 653 withthe water level at least 0.3 m (1 ft) below any point being repaired or, ifrepairs have to be made on or near the tank bottom, with the tank empty.Welding shall not be done on any tank unless all connecting lines havebeen completely blinded.

The Test Supervisor shall as a minimum stop the filling at the followingHold Points to allow for additional inspections, elevation surveys andintegrity evaluations.

- Immediately following floating of the internal roof.- At the one-quarter full level.- At the half or three-quarters full level.- Once the tank level has reached the maximum design liquid level.

7. The test supervisor shall confirm that the fill rate is as per the permitrequirements.

Note: This can be accomplished by checking the level of water in the tankby gauging through the floating roof or by flow gauges on the fill lines.

8. Record times that all tank level readings are taken as well as weatherconditions, water temperature and ambient temperature on the test report.

Readings are to be taken and documented every hour.






9. At regular intervals the Test Supervisor shall:- Check that roof is rising freely and not binding on guide/gauge poles etc.- Check that rolling ladder is moving smoothly.- Check that seal is moving smoothly and distance between roof and tank

shell is consistent and within tolerances. This may be accomplished byplumbing up from the outer rim of the pontoons to above the foam damwhere the distance to the shell can then be measured.

- Check floating roof deck for signs of leaks.- Check all pontoons for leaks by lifting inspection cover and checking

inside with a flashlight.- Visually inspect exterior of tank and appurtenances for signs of leaks.- Confirm that the fill rate does not exceed the rate specified on the permit.- Take water samples for analysis as required by the environmental

permits.

10. Fill the tank to the maximum design liquid level. If the maximum designliquid level is the overflow slots record if leakage overflow is uniform or on

one side of the tank only.11. Remove water supply piping and blind fill valve.

12. Record time tank was full on the test report and begin the 24-hour test.Water test samples may be taken at this point and sent to the laboratory inorder to reduce waiting time.

13. Check tank for visible leaks around shell, floating roof, nozzles, blinds andfoundation.

14. Conduct the following checks every 4 hours and record the results on thetest report.- Inspect floating roof deck and pontoons for leaks.- Check the tank shell, nozzles, blinds for leaks.- Visually check the tank foundation for signs of unusual settlement.

15. Each Acceptance Criteria shall be reported on the Test Reports as either Acceptable or Not Acceptable. All Acceptance Criteria must be acceptablefor a successful test.






A1.4 Tank Emptying and Test Completion Procedure

This procedure generally covers the steps required for emptying the tank and completing thehydrostatic tank test.


1. The Tank Filling and Hydrostatic Testing Procedure has been successfullycompleted.

2. Confirm that all survey work required prior to releasing the test water iscomplete.

3. Take water sample(s) and obtain water analysis. Ensure that the water is notcontaminated and that it can be released in accordance with the permits.Ensure that the Environment Department is notified prior to releasing thewater.

4. Check permit for instructions on discharge rates, environmental protectionrequirements, etc. Ensure that the required protective measures are in place.

5. If required, set up a filtration system to remove impurities such as rust andsmall traces of hydrocarbons from the water to be drained.

6. Drain the tank at proper rate and record levels, temperatures and time on theTest Reports.

7. At regular intervals the Test Supervisor shall:- Check that roof is dropping freely and not binding on guide/gauge poles

etc.- Check that rolling ladder is moving smoothly.- Check that seal is moving smoothly and distance between roof and tank

shell is consistent and within tolerances.

- Confirm that the discharge rate does not exceed the rate specified on thepermit.

- Take water samples for analysis as required by the environmentalpermits.

8. Maintain high legs on deck.

9. Drain as much water as possible from the tank.

10. Unbutton all flanges and clean out tank with squeegees etc.

11. Check that deck legs remain on reinforcing pads on tank floor. Recordresults of inspection on the Test Report.

12. Check roof drain piping for leaks. Record results of inspection on the Test

Report.13. Ensure final survey is conducted.

14. Compile and forward final documentation in accordance with therequirements of the Records section of this specification and of any permits.






Appendix II - Hydrotest Permit Request Form





Hydrotest Permit Request Form

Project/AFE: Request Date:Test Report No: Page of Proposed Test Date:Pipeline Contractor:Testing Contractor:

Description of Facility

Mainline Line - No. From MP To MPStation Piping - StationTank Hydrotest - Tank No. VolumeEmergency Stock Pipe - Pipe IDDrawing Attached - No.

Pipe Data: OD Length

Test Medium Fill Volume Squeeze Volume

Water Source/Withdrawal

Water Withdrawal Date: Start Finish Duration Analine Dye: No YesWater Additives/ Others No Yes (Describe)

Primary Water Source/Location:Secondary Water Source/Location:

Rate of Water Draw: Screen Size on Intake:Method of Transporting Water to Site, if applicable Temporary Piping Tank Truck(If temporary pipe is required, attach maps/drawings and description.)

Water Discharge

Water Discharge Date: Start Finish DurationPrimary Discharge Location:Secondary Discharge Location:

Rate of Discharging Water:Method of Water Treatment:

Discharge Control Measures (e.g., baffles, straw filters, rip rap, tarpaulins):

Requested By: Phone:

Signature :

Source: Enbridge Environmental Guidelines for Construction, December 1, 2003Fax this form to Safety and Environment (780) 420-8253 (CAN) (715) 394-1570 (US)





Appendix III - Above Ground Tank Hydrostatic Test Report




Page of

Above Ground Tank Hydrostatic Test Report

Tank # :

AFE # :

Start Date :

Test Pressure :

Date/Time Height of Height of Test Med. Ambient

Water Water Temp. Temp. Remarks

Change C° / F° C° / F°

Contractor Rep. : Company Rep. :

Documents

Tank Hydrostatic Test Specification CQS001-2006 - A4A1F1