Fixing Procedure for FRP-GRP Pipes

7/28/2019 Fixing Procedure for FRP-GRP Pipes

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23.03.10 0 SEPL NC USY

Date Rev. Prepared Checked Approved

STATUS :

UNITS :

SCALE : NTS SHEET 01 OF 05 REV. 0

THERMOSYSTEMS PVT. LTD.

HYDERABAD

FIXING PROCEDURE OF GRP / FRP PIPES

TSPL-P143-WPS-812DRG NO:

VENDOR/

SUPPLIER :

FILE NO :TITLE :

M.N.DASTUR & COMPANY (P) LIMITED, KOLKATA

MADHUCON PROJECTS LIMITEDROAD NO.36, JUBILEE HILLS, HYDERABAD - 500 033, AP - INDIA

SUBMISSION

SUBMISSION FOR APPROVAL

2 X 135MW THERMAL POWER PLANT (PHASE -1)TAMMINAPATNAM & MUMMIDI VILLAGES, CHILLAKUR MANDAL

SPSR NELLORE DISTRICT - 524121, ANDHRA PRADESH - INDIA

SIMHAPURI ENERGY PRIVATE LIMITEDMADHUCON GREENLANDS, BEGUMPET, HYDERABAD - 500 016, AP- INDIA

DEVELOPMENT CONSULTANTS PRIVATE LIMITED, KOLKATA

ORIGINATOR :

EPC ENGINEER

PROJECT :

OWNER :

OWNER

ENGINEER :

EPC

CONTRACTOR :

Doc. No. : TSPL-P143-WPS-812 Page 1 of 5


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BELL & SPIGOT WITH RUBBER SEAL JOINT

Bell and Spigot with elastomeric seal joint is used to connect two GRP pipes mainly used

for underground application. Bell & Spigot joint has a groove on the Bell end to retain anelastomeric seal that shall be the sole element of the joint to provide the water-tightness.

This flexible joint allows for axial movement of the spigot in the Bell and some angular

deflection.

The schematic arrangement of Bell & Spigot with rubber seal is shown in the sketch. The

GRP pipe will have one end provided with Bell and other end provided with a matching

Spigot. The essential requirements to accomplish this jointing are:

Bell provided at one end of the pipe Spigot provided at other end of the pipe Elastomeric seals made of rubber

Fig. Bell & Spigot Joint with Elastomeric Seal.



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Bell End: The Bell end is an integral filament wound part of the pipe The inner diameter

of the bell end is manufactured perfectly to suit the spigot end with required tolerance.

Spigot End: The other end of the pipe will have the spigot. The spigot end is accurately

machined to the required tolerance.

Rubber Seal: The rubber seal is made up of EPDM rubber. This rubber seal provides a

very tight leak proof joint.

Joint Assembly:

Tools required for assembly of joint

1. Chain pulley block2. Nylon slings.3. Wooden supports

Accessories / consumables required

1. Clothe.2. Vegetable based lubricant.

Joining Method

Step 1: Clean the Bell & Groove.

Thoroughly clean the inside of Bell end and Groove with clean cloth. Make sure that

any dirt or oil left on the surface. Do not use cotton waste in order to prevent thread

or fibers stick on the sealing surface.

Step 2: Install Gaskets

Insert the gasket into the groove leaving loops (typically two to four) of rubber

extending out of the groves. Do not use any lubricant in the groove or on the gasket at

this stage of assembly. Water may be used to moisten the gasket and groove to ease

positioning and insertion of the gasket.



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With uniform pressure, push each loop of the rubber gasket into the gasketgroove.

When installed, pull carefully on the gasket in the radial direction around thecircumference to distribute compression of the gasket.

Check also that both sides of the gasket protrude equally above the top of thegroove around the whole circumference.

Tapping with a rubber mallet will be helpful to accomplish the aboveStep 3: Lubricate Gasket

Using a clean cloth, apply a thin film of lubricant to the rubber gaskets. Always use

vegetable based lubricants,never use petroleum based lubricants.

Step 4: Clean and Lubricate Spigot.

Thoroughly clean pipe spigot to remove any dirt, grit, grease, etc. Using a clean cloth,

apply a thin film of lubricant to the spigots from the end of the pipe. After lubricating,

take care to keep the bell and spigot clean.

Step 5: Fixing of Clamps

Fix first clamp near to the bell end of one pipe or at the left in position to next joint.

Fix Clamp B on the pipe to be connected in the correct position.

Step 6: Pipe Placement

The pipe to be connected is placed on the bed with sufficient distance from previously

joined pipe to allow lowering the coupling into position.



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FIELD HYDROTESTING OF GRP PIPELINES

FOR BELL & SPIGOT JOINT WITH DOUBLE O-RINGS

The GRP pipes are tested at 1.5 times the pressure rating at our factory to ensure the leak

tightness of the pipe. The hydraulic pressure testing along with other mechanical tests

done on the pipe sections prove the capability of the pipe for its intended service.

However, when the pipes are jointed to form a pipeline, it becomes necessary to do field

hydro testing on the pipeline to ensure that joints constructed in the field do offer the

required pressure tightness. This is done by either filling water in the constructed pipeline

in segments by creating blinds at both ends and subjecting the selected segment to 1.5

times the working pressure or by carrying out a joint testing on the constructed pipeline.

The joint testing method on the constructed pipeline is found to be more positive and itavoids the biggest problem of air entrapment and its associated technical issues during

field hydro testing. The entrapped air in the pipeline filled with water for segmental fieldhydro testing cannot be fully removed practically as certain pockets of entrapped air in

bends and fittings tend to remain the pipeline even with air valves fitted in the line. The

entrapped air during pressurisation gets compressed and causes fluctuation in the line

pressure and pipeline movement.

The above problems are avoided in joint testing method. Also, the joint testing method is

more suitable to wet trenches, since leakage can be checked on every joints and

assessment done. Hence, Strategic Engineering is adopting the jointing testing procedure

for field testing of constructed pipeline and the procedure is as shown in the sketch. Wateris filled between the O rings through the nipple and subjected to the required pressure. On

completion of testing, the nipple is closed with the male adaptor and laminated.

Pipes are tested for joint testing at our factory by the above method and the joints are

proved for its performance.


Fixing Procedure for FRP-GRP Pipes

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