Chemical Injection Skids

MECHANICAL DESIGN&DRAFTING DEPT.

© 2009 Petronash. All rights reserved Petronash-Proprietary & Confidential© 2009 Petronash. All rights reserved Petronash-Proprietary & Confidential

CHEMICAL INJECTION SKIDS

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© 2009 Petronash. All rights reserved Petronash-Proprietary & Confidential

Typical chemical injection Skid (Vertical Tank)

Storage tank

Level gauge

Injection Pump

Flow meter

Electrical JB&LCP

Skid drainSkid base frame

Lifting Lug

Calibration pot

PRV.

Pulsation Dampener

Suction line Strainer



Typical chemical injection Skid(Horizontal Tank)

LCP

Ladder platform &handrails

Man way

Over flow with sight glass

Flow meter corolius type

Level transmitter

Gooseneck Vent

Loading Line

Suction Line Strainer

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PUMPS

Diaphragm Type

Plunger Type

Single Head

Multi Head

Manual control

Automatic Control

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Installation of Pumps

Pump should be raised for easily connect suction Lines

Pump should be easily accessible for maintenance

No pipe line should be routed above the pump which restricts accessibility and removal of pump

Take special care If Pump using Electrical/Pneumatic activators it need more space for pump installation

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TanksCommon Type of Tanks

Horizontal Cylindrical on saddles

Vertical Cylindrical with Dished bottom and flat top on Legs

Vertical Cylindrical with conical bottom and flat top on legsRectangular Tank with stiffeners

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Installation and minimum requirement of tanks

Legs of vertical tanks/Saddle of Horizontal Tanks should have a base beam in the skid frame

All tanks should have Ladder if height is more than 2mts and place near by Level gauge for easily access level gauge top nozzle valves

Man way should be in accessible area with appropriate elevation for easy access

All Tanks should have internal ladder

All Tanks should have minimum 2 no's of earth bosses

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Skid Frames

Skid should have a peripheral base frame for support all items in the skid

Skid should have internal supports/stiffeners maximum span of 900 mm for support grating

Skid should have minimum 4 Lifting Lug/ Trunnion support for lifting

Skid should have Minimum 2 No's of Earth Boss/Lug/cleat for Earthling

Skid should have Drip pan if asked by client (CS/SS upon client)

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Ladder hand rail and Platforms

Ladder and platforms are mandatory if anything need to access on top of the tank

All monkey ladder should have minimum width of 400 mm and distance between rungs should be 250 mm if client spec. not available

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Level Gauge and Level transmitters

Level gauge should be near to ladder and loading line

Level gauge drain valve should have sufficient height if it is connecting to common drain header

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Level gauge should be near to ladder and loading line



Tank Manway

All tanks should have Man way/Hand hole According to size of the tank/P&ID

Man way cover should be easily removable and ensure there is enough space for swing the man way cover with Davit

Man way should be placed near side wall of vertical tank for access the inside rungs ladder

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Goose Neck went with flame arrestor

Minimum 1 mts of height required for Gooseneck vent

If flame arrestor mentioned in the P&ID confirm with project s which type of Flame arrestor are going to use

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PRV

All PRV should be installed top of the tanks

PRV. should be accessible for maintenance /calibration

PRV. Outlet line should be sloped towards tank nozzle for drain completely

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Return lines

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All return lines should be neatly arranged and properly supported

All return lines should be sloped towards tank return nozzle for easy drain and any expansion in return line and if it is horizontal should use eccentric reducer only


© 2009 Petronash. All rights reserved Petronash-Proprietary & Confidential 15

Loading lines

Loading lines should be neatly arranged and properly supported

Loading lines should be easily accessible elevation and near to Level gauge for clear view of filling



Tank outlet valve should be accessible for easy operationTank outlet to pump reduction line reducer should be eccentricSuction line drain should be clear from obstructions of base frame

Suction line strainer should be in a convenient elevation and away from all obstruction for easy removal of filter and drain

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Pump suction Lines



Discharge/Injection Lines

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Injection line valves should be easily accessible for operation

For easy operation and maintenance of pump no discharge line should be routed above the pump

All PD,PG,PRV&PT shall be Visible, accessible and have space for replacement

If required all the above said items shall be branched separately for easy operation and maintenance



Discharge/Injection Lines

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Prior to installing any Flow meter confirm whether this can be install horizontal/vertical

All Flow meters/Flow indicators shall be installed as per below mentioned rule

10D 5D

Flow meter

D=Id of pipe



Miscellaneous

Loading pumps etc

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Documents

Chemical Injection Skids