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[MW:34558] Electrofusion welding WPS and ITP

By Materials & Welding

Hello Team,
 Any one to help me with a sample of Electrofusion welding of HDPE pipes WPS and ITP? 
I will be grateful for your help.

Regards
Robert
On Wednesday, December 8, 2021 at 10:32:52 AM UTC+3 RANEESH PK wrote:
Following methods can be used, 

1.Pre-welding check and preparation
  a,Visual inspection of equipment and accessories
  b,Heater plate is free from  dirt and residues from previous weld
2.Welding
a,Position the pipes into the machine and ensure enough space for  face grinding
b,Check pipe alignment ,if required adjust the clamps bolts
c,Fit facing tool between the two pipe ends and start grinding until both sides appear homogeneous.
d,Proceed to re-connect- the pipe ends from facing tool ,also remove all facing scraps from pipe inside  before connections
e,Put in contact the two pipe ends to be welded and check alignment,There should be no visible gap(less than 0.5mm) between joint,max permitted outside mismatch not exceed 10% of wall thickness.
f,Fix heater plate (Normal Temp-210 deg.C)between the pipe ends and applying pressure using hydraulic system,maintain pressure until pipe begins to melt and uniform,2-3mm initial bead height can be used
e,After initial bead up ,release the pressure so as to control the bead growth during heat sock time.The pipe ends must contact the plate until the heating is completed.
f,Open clamp and remove heater plate ,immediately close the clamps and bring the melted surfaces together at the previously determined pressure
g,Maintain the required pressure for minimum cooling time ,do not use external cooling like air or water
h,Examine joint for cleanliness and check that the alignment and bead height with in limit

On Wed, Dec 8, 2021 at 10:20 AM Zakaria ghrab <zakari...@gmail.com> wrote:
Hi all,

  Could any one, give me the principle inspection steps on HDPE underground piping installation or send me a sample for reference.

Thank you.

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Thanks and Regards, 
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زكرياء غراب
GHRAB Zakaria 
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