BPV Spring 2010 Final

8/18/2019 BPV Spring 2010 Final

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The first wave of baby-boomers is due to reach

retirement age by 2012 – and by 2020, it is

estimated that Canada could be short about 1

million workers due to an ageing population and

declining birth rates (Conference Board of Canada,

2000). By 2026, more than half the population will

be over the age of 43 (Canadian Federation of

Independent Businesses, 2003).

What will this mean for our respective industries –

and how will it impact safety?

With fewer students entering technical trades and

professions, a future shortage may exacerbate

non-compliance issues and incidents in the boilers

and pressure vessels industry as well as power

engineering. Human capital and succession

planning will become even more critical to the

success of many organizations. In this context,

greater knowledge transfer through documented

knowledge management processes, with

possibilities such as apprenticeship programs and

engineering co-ops, will somewhat mitigate the

safety risk with respect to the projected skill-gap,

as well as enable continued access to the

knowledge, skills and experience of the boilers and

pressure vessels/operating (power) engineers work

force.

Since 2001, the Technical Standards and Safety

Authority (TSSA) has acted as an influential

advocate and, where appropriate, a lead to prompt

both industry and government to create additional

training capacity for required skills, enhance the

availability of training programs, and attract new,

younger and second-careeer workers into impacted

fields.

TSSA additionally raised potential concerns

regarding the availability of skilled workers within

each of its safety advisory councils. Responses

varied significantly, but interest was demonstrated

in coordinated actions to promote the training and

availability of skilled resources.

As such, TSSA has been involved in:

• monitoring the situation to determine if such

shortages begin to create public safety

Trends suggest that Canada, and Ontario specifically as an

economic driver, is beginning to feel the effect of a shortage in

skilled trades and professions, and this will likely worsen if not

immediately addressed.

ISSUE I N

T H I S

Incident Review: Pressure Equipment

Exposed to Fire 2

TSSA Approved Training Providers 3

Requirements to Manufacture or Install

Piping Systems for ASME/NB Certificate

Holders 3

New Requirements for R-744 — CarbonDioxide as a Refrigerant 4

Is Media the Message? 5

National Board Announces Changes to

Commissioning Process 6

New VP of Operations — Michael Beard 7

Impregnated Graphite Pressure Vessels 8

Unqualified Source Material for Nuclear

Applications 9

Fusible Plugs for Hand-Fired Boilers 9

ASME B16.5 Slip-On Flange Attachment

Welds 10

ASME Section IV — 2009 Addenda:

Heating Boiler Minimum Design

Thickness 11

Volume 7

Issue 1

Spring 2010

BOILERS AND PRESSURE VESSELS EDITION

continued on page 12

Messagefrom the Acting Director By John Marshall, Acting Director of Boilers and Pressure Vessels andOperating Engineers Safety Program

P u t t i n g P u b l i c S a f e t y F i r s t

Update


http://slidepdf.com/reader/full/bpv-spring-2010-final 2/12P u t t i n g P u b l i c S a f e t y F i r s t

Volume 7

Issue 1

Spring 20102

This article introduces one evaluation technique as

provided in API 579-1 / ASME FFS-1 2007 Fitness-

for-Service (Issue June 5, 2007).

API RP 579 was first published in 2000 by the

America Petroleum Institute (API) for the refining

and petrochemical industry as a recommended

practice for the assessment of the structural

integrity of equipment containing identified flaws or

damage. Since ASME had also begun to review

post-construction issues, both writing organizationsformed a joint committee to avoid overlap and

duplication by expanding the industry application to

include a wider range of processes, manufacturing

and power generation industries. The standard is

currently under the purview of the ASME Board on

Pressure Technology Codes and Standards and the

API CRE Committee, and it has been approved by

the American National Standards Institute (ANSI).

Part 11 of API 579-1 / ASME FFS-1 introduces a

guideline for how to identify components requiring

an evaluation. Part of that evaluation may require

re-rating of components that have been judged to

have experienced changes in mechanical

properties. The guideline does not include non-

pressure containing components, nor does it

address wiring, instrumentation or gaskets, which

typically is assumed to require replacement. The

standard provides the following categorized list of

damage to be considered:

a) mechanical distortion and structural damage

(for example caused by thermal and/or

restricted expansion);

b) degradation of mechanical properties;

c) degradation of metallurgical microstructure;

d) degradation in corrosion resistance and

susceptibility to environmental cracking and

creep damage;

e) presence of crack-like flaws in the pressure

boundary; and

f) residual stress changes.

A flow chart is also provided to assist in the steps of

the evaluation process.

Fire damage evidence must be collected, whichincludes determination of why the fire occurred and

the nature and extent of damage, noting aspects

such as fire confinement or the spread of fire. Data

collection should include:

a) the temperature extremes to which various

components were subjected;

b) the nature of the fuel including any heat source;

c) the location of ignition source or sources

including direct flame impingement and/or

radiant heat;

d) the time duration at temperatures; and

e) the cooling rate.

The data collection is then further developed to

include a plot plan of the area showing location of

equipment and as much information as possible

such as flow directions of water used to extinguish

the fire. From the information collected, heat

exposure zones are developed and ASME begins to

define the components which would require an

assessment. It should also be noted that attention

needs to be given to uninsulated attachments such

as bolting and fittings attached to an insulated

pressure vessel or piping. Three levels of

assessments are described depending on the heat

exposure zone. Six exposure zones are also

described, starting with Zone I at ambient

temperature with no damaging effects, to Zone VI

over 730ºC (1346ºF), that is considered severe hea

exposure.

Charts are included describing specific materials of

construction and what impact you would expect to

see. For example: paint on tanks or structural steel

shows visible colour changes, blistering or charring

at temperatures over 205ºC (400ºF) and copper

tubing such as for instruments or condenser tubingsoftens and sags with grain coarsening at

temperatures exceeding 280ºC (540ºF).

All pressure equipment is regulated under Ontario

Regulation 220/01 (Boilers and Pressure Vessels),

and its exposure to fire is a reportable incident to

TSSA. The Authorized Inspector needs to inspect

any such item that has sustained possible damage

that is not repaired or replaced, and it would need to

be demonstrated that it has been effectively

evaluated proving fitness for service.

INCIDENT REVIEW: PRESSURE EQUIPMENTEXPOSED TO FIREBy Cathy Turylo, Engineering Manager, Boilers and Pressure Vessels Safety Program

Over the years, TSSA has seen

several instances where pressure

equipment has been exposed to a

fire, that is direct flame

impingement or radiant heat of a

fire, and the questions are: is this

equipment potentially damaged

and is it fit for service?



TSSA Approved Training ProvidersBy Joe Raso, Examiner, Operating Engineers Safety Program

TSSA BOILERS AND PRESSURE VESSELS EDITION 3

Although studies show a decline in the number of

persons entering the profession of Power/

Operating Engineering within Canada, TSSA notes

that Ontario is being proactive in attracting people

to Power Engineering by offering practical time-

reduction incentive programs for approved training

courses.

The level of interest in such programs is rapidly

growing and there are currently four approved

TSSA training providers in the province of Ontario:

Confederation College in Thunder Bay, coordinated

by Ron Morancy; Cambrian College in Sudbury,

coordinated by Robert Baker; Lambton College in

Sarnia, coordinated by Bryan Aitken; and St. Clair

College in Windsor, coordinated by Eli Di Credico.

These four approved training providers have a total

intake of approximately 400-500 students annually

for one- to three-year courses. Each faculty has its

own uniqueness that attracts the younger

generation as well as second-career candidates

from all areas.

Each of these approved training providers has a

positive impact, not only for students but for future

training providers seeking time-reduction program

approval in the dynamic profession of Power

Engineering.

If your company intends to fabricate pressure

piping, regulated under Ontario Regulation 220/01

and in accordance with ASME Code B31.1 or

B31.3, you must also meet the additional

requirements of the CSA B51Boiler, Pressure

Vessel and Pressure Piping Code. The additional

requirements of CSA B-51 are mostly administrative

in nature and may be addressed in a supplement to

your existing Quality Control Manual. In this case, a

full survey at the shop location is not necessary and

TSSA can perform modified assessments based on

the manual and supplement review. This option is

not available to the ASME or NB certificate holder,which only holds a certificate for safety relief

devices.

Applicants must submit:

• an application;

• a deposit or purchase order;

• valid ASME or NB Certificate of Authorization;

and

• Quality Control Manual with supplement.

The following are guidelines to address in the

supplement:

• cover page and scope of the supplement (add

reference to CSA B-51);

• definition of code to include CSA B51;

• drawings and design control – provision to

ensure that pressure piping system drawings

are submitted to TSSA Boiler s and Pressure

Vessels (BPV) Engineering for registration of

the piping system;

• material control to state that fittings and flexible

hose assemblies used for the piping systemrequire a separate Canadian Registration

Number issued to a fitting manufacturer;

• Provision for Authorized Inspector employed

either by a jurisdiction or Authorized Inspection

Agency for inspection of the pressure piping;

• data report provision for a company

representative and the Authorized Inspector to

sign and date the “TSSA Piping System

Installation and Test Data Report"; and

• supplement control – provision for TSSA

representative sign-off on the supplement.

After a modified assessment, TSSA will issue a

Certificate of Authorization valid for three years – if

all requirements have been met.

Name or Location Change onCertificate of Authorization

Certificate holders from time-to-time change the

name or location on their Certificate of

Authorization. These changes require that the

certificate holder apply for a new certificate. TSSAhas posted guidelines on its website so certificate

holders know what to do if such a situation occurs.

If all requirements of the guidelines have been met,

TSSA can issue a Certificate of Authorization with

the new information; otherwise a new survey will be

required.

REQUIREMENTS TO MANUFACTURE OR INSTALL PIPINGSYSTEMS FOR ASME / NB CERTIFICATE HOLDERSBy Frank Musuta, Technical Specialist, Boilers and Pressure Vessles Safety Program






Annex J, a new normative (mandatory) annex to

CSA B52, is also provided in Supplement No.1,

identifying several precautions and hazards for

carbon dioxide refrigeration systems. Clause J5

identifies carbon dioxide’s potential to sublimate at

low pressure that is solid carbon dioxide (dry ice)

forming from the vapour phase. This creates a

concern for relief valves to freeze up while relieving

pressure. Care must be taken when relieving

pressure or transferring liquid carbon dioxide to

guard against a blockage due to solid carbon

dioxide forming at low pressures. Relief valves are

positioned to discharge directly to the outdoors

without vent lines to minimize the potential of

blockage due to the formation of solid carbon

dioxide.

Although carbon dioxide is non-toxic, it is an

asphyxiant and therefore there is a real danger of

suffocation. Per Table 1 of CSA B52, the maximum

quantity of carbon dioxide permitted per occupied

space is 2.5 kg / 304 m3 (5.7 lb / 1000 ft3) and is

limited by IDLH4. Adequate ventilation must be

provided and carbon dioxide detectors are strongly

recommended. To compound this problem, liquid

carbon dioxide has a very high coefficient of thermal

expansion; use at ambient temperature could be

sufficient to expand trapped liquid, generate excess

pressure and rupture components. Thermal relief

valves must be considered in all sections of the

system where liquid carbon dioxide could be

trapped.

Other considerations such as chemical reactions

with carbon dioxide (with water to form carbonic

acid or with ammonia) in a cascade system using

carbon dioxide and ammonia can form the corrosive

ammonia carbonate or with some synthetic oils can

form carboxylic acid. Care needs to be exercised to

avoid cross contamination.

New installations of carbon dioxide refrigeration

systems require these designs to be registered with

TSSA and shall demonstrate compliance with all

aspects of the new CSA B52 requirements including

the new Annex J. Installation inspections by the

TSSA Authorized Inspector will require verification

that all required safety features have been provided

4IDLH - immediately dangerous to life or health; thmaximum concentration of a substance from whicone can escape within 30 minutes without any escape-impairing symptoms or irreversible healtheffects.

Care must be taken when relieving

pressure or transferring liquid

carbon dioxide to guard against a

blockage due to solid carbon

dioxide forming at low pressures.

IS MEDIA THE MESSAGE?

Engineer Kaivan Kia at TSSA participated in two

webinars hosted by an information handling

service, in which he confirmed the efficiency and

effectiveness of using the ASME code as well as

other codes on-line, a service that has been used

for quite a few years at TSSA. The two one-hour

webinars combined attracted over 1600

participants from around the world including theUnited States, Mexico, Europe and China!

Now we ask you, is the media still the message?

S A REFRIGERANT



No Change in Scope for CurrentCommission Holders

The scope of work for an individual holding a

National Board Commission (with or without

endorsements) issued prior to January 1, 2010, will

not change. For example, the scope of work for an

inspector holding a Commission issued prior to

January 1, 2010, includes in-service inspections

and repair/alteration inspections. After January 1,

2010, nothing will change. The inspector will still be

able to perform in-service inspections and

repair/alteration inspections. Many AuthorizedInspection Agencies require an inspector to have

an “A” endorsement to perform repair/alteration

inspections. An Inspector whose “A” endorsement

was issued prior to January 1, 2010, will still be

able to perform repair/alteration inspections.

Revised Commission Cards

Commission cards have been revised to reflect

these changes. The card front shows the

designation at the bottom: In-Service Commission

on the lower-left and New Construction on the

lower-right.

Commission cards for individuals holding a

National Board Commission issued prior to

January 1, 2010, will be annotated “IS” under “In-

Service Commission” on the lower left.

Commission cards for individuals holding a

National Board Commission and endorsement(s) A,

B, N, NS, I, or C issued prior to January 1, 2010,

will be annotated “IS” under “ In-Service

Commission” on the lower left and the

endorsement A, B, N, NS, I or C shown under “New

Construction Commission” on the lower right. The

back of the commission card explains the

designations.

New Construction Inspector Commission – Repairs/Alterations

Individuals who attain the New Construction

Inspector Commission after January 1, 2010, (and

who do not have the In-Service Inspection

Commission) will be required to complete National

Board’s Part 3 Online Training course prior to

performing repair/alteration inspections. This is a

requirement to ensure individuals have exposure to

the National Board Inspection Code, not available

in the “A” Course. The commission cards for these

individuals will be annotated with an “AR” under “New Construction Commission” on the lower right.

When an inspector, having only a New

Construction Inspector Commission, is entering

information on an ASME Manufacturer’s Data

Report, the endorsement listed should be “A” and

not “AR.” Similarly, when entering information on

NBIC Forms R-1, R-2, etc., the endorsement

should be “AR”, and not “A.” Inspectors having an

“IS” commission, with or without an endorsement,

are not required to enter any endorsement on the

NBIC Forms.

There will be no change in fees for the newcommissioning process.

Revised In-Service Inspector Examination

The scope of the examination will be changed to

more accurately reflect items an in-service

inspector actually inspects. Basis of the


Volume 7

Issue 1

Spring 20106

NATIONAL BOARD ANNOUNCES CHANGES TO CO

Beginning January 1, 2010, the

National Board will offer two separate,

but equal commissions: one for

inspectors performing in-service

inspections (In-Service Inspector

Commission), including jurisdictional

certificate inspections, repair and

alterations; and one for inspectors

performing shop and field inspections

(New Construction Inspector

Commission). The In-Service Inspector

Commission may be attained by

passing the In-Service Inspector

Commission examination, while the

New Construction Inspector

Commission may be attained byattending the National Board “A”

Course and passing the examination

(following the course). Inspector

candidates for both commissions

must meet additional requirements in

NNB-263, “Rules for National Board In-

Service and New Commissioned

Inspectors,” including requirementsfor education, experience and

employment1.




examination will come mostly from Parts 1, 2 and 3

of the National Board Inspection Code and NB-263.

Some calculations will still be derived from formulas

in the ASME Code. A new body of knowledge will

soon be available on the National Board’s website,

specifically detailing what an inspector candidate

should know. The In-Service Inspector examination

will be changed to a one day format, consisting of

two three-and-one-half hour sessions totalling

seven hours. There will be 85 questions and a

score of 70 or above is required for passing.

Compatible Training Course (New)

A new In-Service Commission (IC) training course

will be available in early 2010. It is non-mandatory

and will replace the current Pre-Examination

Course (PEC). The IC Course will combine

examination preparation with emphasis on in-

service inspection: installation, product inspection,

service conditions and verification inspections

required for repairs and alterations. Training will

complement the newly revised Body of Knowledge,

which will support the examination.

Inspector Candidates in Transition

Individuals, who take the National Board

Commission Examination in December 2009 and

receive a passing score and meet all the other

requirements of NB-263, will be issued an In-

Service Inspector Commission, with an “IS”

designated on the lower left.

Individuals, who take the National BoardCommission Examination in December 2009 and do

not receive a passing score, may be eligible to

retake the examination. A new requirement for re-

examination (NB-263 Paragraph RI-1.7) states: “An

applicant, who fails to receive a passing grade after

taking the examination three times in a 12 month

period, shall not be permitted to take the

examination for at least one year following the last

attempt.”

Summary

The changes have been developed to meet current

needs of industry, based upon feedback received

from employers of inspectors. The ultimate goal is

to avoid compromising the quality of a process in

effect for nearly 90 years. For more information,

visit the National Board’s website at

www.nationalboard.org .

1Note: For a copy of the newly revised NB-263, please reference the National Board website at:

www.nationalboard.org/SiteDocuments/Commissioned%20Inspectors/NB-263.pdf .

TSSA recently made a few organizational changes,

seeking to improve operational efficiency – with the

ultimate goal of further enhancing safety

performance. To that end, a new role of Vice

President of Operations has been created to

provide strategic direction for all program areas,

and assist in the development, assessment and

implementation of TSSA’s corporate strategies.

Not only will this role provide more strategic

decisions at the corporate level, it will enable the

program directors and managers to focus more fullyon operational matters – a shift that will enable

TSSA to enhance its overall safety performance and

organizational effectiveness.

It is in this context that TSSA is pleased to

announce Michael Beard as the new Vice President

of Operations.

With a considerable background in operations and

general management, spanning Canada, the US

and South Africa, Mr. Beard brings a wealth of

strategic and operational experience, including

senior positions within several companies, such as

Chubb Security Canada and Bell ExpressVu. He

additionally has a Bachelor's Degree in Electrical

Engineering and a Masters Degree in Business

Leadership.

Michael brings valuable executive and strategic

leadership skills to TSSA, and is becoming a strong

member of TSSA’s senior management team.

NEW VP OF OPERATIONS – MICHAEL BEARD

SIONING PROCESS



Volume 7

Issue 1

Spring 20108

IMPREGNATED GRAPHITE PRESSURE VESSELS

By Wendy Du, Mechanical Engineer, Boilers and Pressure Vessels Safety Program and

Cathy Turylo, Engineering Manager, Boilers and Pressure Vessels Safety Program


Graphite is porous and cannot be used in pressure

vessel construction but when impregnated with

resin can become pressure retaining. Impregnated

graphite in a specified proprietary process is made

up of graphite grades and impregnating agents in a

unique composite material and, although graphite

and impregnating agents have specifications, there

is no published specification for this composite.

These vessels are designed for a maximum

internal and/or external pressure of 2410 kPa (350

psig) and minimum temperature of -73 °C (-100

°F) and maximum temperature of 204 °C (400 °F).Specific material properties and controls are

provided in Part UIG and are used in the design

calculations for each vessel part. New terms are

also introduced in this part, including “cementing”,

which is the process of joining parts using graphite

cement followed by a curing process, and certified

materials, which are only manufactured by a

Certificate Holder. Pressure tests are also

identified as hydrostatic only and at 1.5 times

design pressure and 1.75 times for lethal service

vessels.

Manufacturers wanting to build with this materialwill still apply their ASME Code “U” symbol stamp

for ASME Section VIII Division 1 construction (note

“UM” stamping is not permitted), and will also need

to include new requirements provided in Part UIG

in their ASME Quality Control Manual. The manual

will need to include provisions for the Authorized

Inspector to review re-qualification of procedures

and personnel, and material control traceable to a

lot number which is maintained until the Data

Report is completed and Code symbol applied.

The manufacturer needs to maintain all records for

at least five years after production has ceased.

These vessels will have unique marking on their

ASME nameplate. Under the ASME “U” code

symbol stamp, there will be a letter “G” indicatinggraphite pressure vessel or pressure vessel part.

The nameplate can be applied to either the

metallic or graphite parts. For multiple identical

items from a single lot, such as for graphite tubes,

the partial stamping nameplate is applied to the

bundle or container as applicable. Each piece is

identified by permanent marking with the

manufacturer’s name, date and serial number. The

subsequent manufacturer maintains the nameplate

until all pieces are used and the ASME “U” stamp

is obliterated from the nameplate in the presence

of the Authorized Inspector.

These vessels, like any other pressure vessel in

Ontario, will require design registration and

Canadian Registration Number stamped on the

nameplate, installation inspection by the TSSA

Authorized Inspector and periodic inspection in

accordance with Ontario Regulation 220/01

(Boilers and Pressure Vessels). Overpressureprotection is also required and any reaction forces

from the relief device on the graphite components

will need to be considered.

Pressure vessels constructed of impregnated graphite are a safety matter and a brand

new section in the ASME Code Section VIII Division 1 in the 2009 addenda under Part

UIG. This material is used in industrial applications such as the pharmaceutical and

chemical process industries for corrosion resistance and high temperature conductivity.

There are unique material considerations for design, fabrication and testing since this

material, unlike metallic vessels, is brittle and properties are dependent on the

fabrication process. There are also new marking requirements and a new data report –

Form U-1B – to be used.

These vessels are designed for a

maximum internal and/or external

pressure of 2410 kPa (350 psig)

and minimum temperature of

-73 °C (-100 °F) and maximum

temperature of 204 °C (400 °F).

Specific material properties and

controls are provided in Part UIG

and are used in the design

calculations for each vessel part.




This article is to assist Certificate

Holders and Material Organizations

in understanding the ASME Code

requirements for Unqualified

Source Material in nuclear

applications.

Q: What is unqualified sourcematerial?

A: ASME Sec. III, Div.1, NCA-9000 defines it as:

“…source material not produced by a

Certificate Holder, Material Organization, or

approved supplier in accordance with the

requirements of NCA-3800.”

Q: What does the UnqualifiedSource Material section of ASMESec. III, Div.1, NCA-3855.5permit?

A: It provides a Certificate Holder or an

accredited or qualified Material Organization

with a means of converting unqualified source

material to source material by following a

process of qualification defined in NCA-3855.5.

Briefly the activities are:

1) Accept certification of the requirements

performed during the melting, heat

analysis and heat treatment of the

unqualified source material by the

producing material manufacturer.

2) Verify that no welding was performed on

the unqualified source material by the

producing material manufacturer.

3) Perform or subcontract a product

analysis to verify the chemical

composition of each piece of unqualified

source material.

4) Perform or subcontract all other

requirements of the material

specification on either:

i) each piece of unqualified source

material (where Certificates of

Compliance [NCA-3862.1(g)] are

acceptable, testing of each piece is

not required) or;

ii) each heat and lot of unqualified

source material, only if heat and lot

identification and traceability have

been established by the supplier in

accordance with NCA-3855.5(3)(a)to (e), i.e.:

a) A Certified Material Test

Report is provided with the

unqualified source material.

b) The unqualified source

material is traceable to the

Certified Material Test Report.

c) Procurement documents

require that suppliers of

unqualified source material

establish written procedures

for identifying source

materials in a manner that

provides traceability to the

Certified Material Test Report

d) The Material Organization

reviews and accepts the

supplier’s identification and

traceability procedures and

verifies compliance with the

procedures at a frequencycommensurate with the

schedule of production or

procurement, but at least

once triennially.

e) Upon receipt, the Material

Organization shall verify by

review of objective evidence

that the requirements of the

procurement documents have

been met.

Note that the requirements of (2) and (3) above

apply to verification and testing of all unqualified

source material before performing the tests requiredin (4) above. It shall also be noted that the

provisions of (1) through (4) above are performed in

accordance with the Material Organization’s Quality

System Program.

Please refer to ASME Section III, Div.1, NCA-

3855.5 for a complete list of the code requirements

UNQUALIFIED SOURCE MATERIAL FORNUCLEAR APPLICATIONSBy Larry Calvert, Senior Technical Specialist, Boilers and Pressure Vessles Safety Program

FUSIBLE PLUGS FOR HAND-FIRED BOILERSBy Cathy Turylo, Engineering Manager, BPV Safety Program

The requirement for fusible plugs for hand-fired

boilers (solid fuel-fired boilers) has been reinstated

in the 2009Addenda of the ASME Code Section I

High Pressure Boilers. Fusible plugs must follow

the requirements provided in Appendix A, including

a minimum replacement interval of once per year.

All owners/users of hand-fired boilers should take

note of this safety device requirement for new

construction under ASME Section I.Adding a

fusible plug to existing equipment can be treated

as a repair 1; however , it is strongly recommended

that the original boiler manufacturer is consulted as

to the appropriate

location for the fusible plug.

1Repairs must be conducted by a Certificate of Authorization holder for repairs and can bewitnessed by an insurance inspector (if insured)or the TSSA Authorized Inspector.



Volume 7

Issue 1

Spring 201010

ASME B16.5 SLIP-ON FLANGE ATTACHMENT WELDS

By Stephen Lam, Senior Engineer, Boilers and Pressure Vessels Safety Program

In the 2009 addendum of ASME Section VIII DIV 1,the sizes of the attachment welds for ASME B16.5

slip-on flanges have been brought into line with the

piping codes. In the ASME B31.1 (Power Piping),

B31.3 (Process Piping) and B31.5 (Refrigeration

Piping and Heat Transfer Components) codes, the

size of the internal fillet/groove weld for slip-on

flanges is the lesser of tn or 6 mm (1/4 in.), and the

size of the external fillet weld is the lesser of 1.4tnor the thickness of the hub of the slip-on flange.

In the 2009 addendum of ASME Section VIII DIV 1,

instead of referring to FIG. 2-4 sketch (3) of

Appendix 2, FIG. UW-21 (for socket weld flanges)has been expanded to include typical details for

slip-on flange attachment welds. However, there is

an error in FIG. UW-21 where the size of the

external fillet weld (xmin) is defined as “the lesser of

1.4tmin or the thickness of the hub” in lieu of “the

lesser of 1.4tn or the thickness of the hub”. It is

expected that this error will be corrected in the 2010

edition.

The maximum set-back dimension for the flange

shown in FIG. 2-4 sketch (3) has now been

eliminated in FIG. UW-21. The internal weld does

not need to be larger than 6 mm (1/4 in.), but theexternal fillet weld is much larger than it used to be.

Note: tn is the nominal thickness of the pipe/nozzle

neck

For updates and further information,

check out TSSA’s website

www.tssa.org




ASME SECTION IV – 2009 ADDENDA: HEATING BOILERMINIMUM DESIGN THICKNESSBy Liliana Constantinescu, Engineer, Boilers and Pressure Vessles Safety Program

The Addenda 2009 of ASME Section

IV introduced an important change in

calculation of the minimum thickness

of any ferrous or non-ferrous plate

used in the manufacturing of heating

boilers by deleting the diameter-based

minimum thickness requirements of

table HF-301.1 and HF-301.2. This

change has a significant impact on thedesign of heating boilers and

especially for the design of large

boilers with a diameter over 1067 mm

(42 in.).

In the previous edition of ASME Section IV, the

minimum thickness of ferrous or non-ferrous plates

was established as the maximum value between

the thickness determined by HG formulas or by

proof testing and the thickness value presented on

tables HF-301. For heating boilers with a diameter

over 1067 mm (42 in.), the requirements of tables

HF-301 were governing in most of the cases

because of the low design pressure/temperature

applications which actually made the design very

conservative and the used plate thickness over-

designed.

Based on the 2009 Addenda, the minimum

thickness of ferrous plates used in the

manufacturing of heating boilers is established as

the maximum value between the thickness

calculated by HG formulas or by proof testing and

6.3mm (1/4 in.). There are two exemptions to this

rule: one for low pressure-limited diameter design o

carbon steel plates presented in paragraph HF-

301.1(b); and the second for specific alloy steel

plates presented in paragraph HF-301.1(c). For

non-ferrous material, the minimum thickness is

established as the maximum value between the

thickness calculated by HG formulas or by proof

testing and 3.2 mm (1/8 in.) for copper, admiralty

and red brass and 2.4 mm (3/32 in.) for copper-

nickel alloys.

To illustrate the Addenda 2009 change in the

heating boiler design, the minimum thickness of a1118 mm (44 in.), 1575 mm (62 in.) and 2032 mm

(80 in.) ID shell plate were calculated based on

requirements of the previous edition of ASME

Section IV and the 2009 Addenda listed in the

following table.

Boiler’s

Shell

Diameter ID

Plate’s

Material

Specification

Design Conditions HG-301

Formulas

t=PR/SE-0.6P

Table

HF-301

Section IV -2007 Ed.

Add.2008

min required thickness

Section IV -2007 Ed.

Add. 2009

min required thickness

1118 mm

(44 in.)

SA-516

GR.70

P=412kPa(60psi)

T= 120C(250F)

E=0.6 worse case

4 mm

(0.158 in.)

8 mm

(0.3125 in.)

Max (4 mm,8 mm) =

8 mm (0.3125 in.)

Max (4 mm, 6.3 mm) =

6.3 mm (0.25 in.)

1575 mm

(62 in.)

SA-516

Gr.70

P=412kPa(60psi)

T= 120C(250F)

E=0.6 worse case

5.6 mm

(0.222 in.)

9.5 mm

(0.375 in.)

Max (5.6 mm, 9.5 mm)

= 9.5 mm (0.375 in.)

Max (5.6 mm, 6.3 mm) =

6.3 mm (0.25 in.)

2032 mm

(80 in.)

SA-516

GR.70

P=412kPa(60psi)

T= 120C(250F)

E=0.6 worse case

7.3 mm

(0.287 in.)

11 mm

(0.4375 in.)

Max (7.3 mm, 11 mm)

= 11mm (0.4375 in.)

Max (7.3 mm, 6.3 mm) =

7.2 mm (0.29 in.)



Volume 7

Issue 1

Spring 201012

B O I L E R S A N D P R E S S U R E V E S S E L S E D I T I O N

We welcome your comments and story ideas for future

editions of this newsletter. Please contact:

TSSA UPDATE (Boilers and Pressure Vessels Edition)

3300 Bloor St. West, 14th Floor, Centre Tower,

Toronto ON M8X 2X4

Email [email protected]

Fax 416.231.1626

Message from the Director continued from page 1

concerns or hamper the organization’s ability

to operate effectively;

• working with the advisory councils to quantify

thresholds of labour shortages that begin to

create public safety risks;

• continuing to participate with industry partners

such as the Heating Refrigeration and Air

Conditioning Institute, Ontario Energy

Association, and Skills Canada (Ontario) in

formulating plans to mitigate such risks;

• considering unique applications for remote

areas within Training and Certification with use

of innovative processes such as the promotion

of on-line training to ensure educational

access is not a roadblock;

• recommending regulatory improvement to

provide new certification initiatives to assist

those entering or within the profession of

power engineering; and

• working with the Ministry of Trades, Colleges

and Universities (MTCU) to increase operating

(power) engineering courses.

Specific to TSSA’s Operating Engineers programarea, the organization has begun two key risk

reduction groups (RRGs) with regard to pandemics

and anticipated staff shortages in power engineering

roles in registered plants.

Considering TSSA’s response to a widespread

outbreak of a debilitating disease or illness, such as

the H1N1 flu virus, the first RRG has examined how

TSSA would respond to a large number of power

engineers falling ill and how, or if, to allow plants to

continue operating with lower levels of staffing.

The second RRG has been defining ways that

TSSA, working with industry and government, can

encourage the current and future generations of

students to consider power engineering as a career,

particularly as power engineers near retirement and

new power and steam plants put additionaldemands on the profession.

TSSA has also completed its work with MTCU and

the Ministry of Consumer Services with regard to a

national commitment to labour mobility through the

Agreement on Internal Trade (AIT). What is AIT?

It is an intergovernmental trade agreement, signed

by Canadian First Ministers in 1995, to eliminate or

reduce measures that restrict labour mobility across

provinces.

AIT or labour mobility will allow an individual

certified for a specific occupation in one province or

territory to be recognized for the same or matched

certification in another province or territory – without

additional material training, experience,

examinations or assessments.

Equivalency will however require careful

consideration by TSSA and MTCU. The proposed

legislation does allow TSSA to maintain additional

certification requirements for workers already

certified elsewhere in Canada, if the requirements

are deemed necessary to ensure the public is

protected. Exceptions supported by the Ontario

government will be posted on the MTCU website at

www.edu.gov.on.ca/eng/tcu .

If a province has concerns regarding standards in

another jurisdiction, the government may support anexception to full labour mobility; however,

exceptions may be challenged. Challenge

procedures may be found on the MTCU website as

well. For further details on matched certificates

between Ontario and other provinces, visit TSSA’s

website under ‘Labour Mobility’ at www.tssa.org.

Sign up for email notifications on TSSA’s Boilers

and Pressure Vessels/Operating Engineer

webpages and receive prompt updates on this and

other safety issues.

Any further questions, please contact TSSA’s

Customer Contact Centre via email at

[email protected] or toll-free at

1-877-682-8772.

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