Jointing

Accessories for Flange Pipes: 

Gaskets
For Flanged pipe jointing are normally flat rubber gaskets EPDM el astomer as per ISO 4633.Use of poor quality gaskets made of Natural rubber is not recommended. 

Bolts & Nuts for the joint  
Bolts made of Mild Steel as per ISO 1367 & Galvanized Nuts. High Tension bolts may be used where high axial load is anticipated.

Jointing Procedure for DI Flanged Pipes :
- Clean the faces of the flanges.
- Inspect the gasket for any damage or manufacturing defect.
- Align the pipes property and position the gasket between the flanges.
-Put the bolts into the flange holes one by one maintaining the alignment.
-Keeps the gap between the flanges approximately uniform while tightening .
-Tighten four location bolts in order to roughly secure the adjoining flange.
-Bolts to be tightened in the correct sequence and to the appropriate torque.
-Tighten nuts to finger tight.
-Check alignment of  flange face and gasket.
-Insert remaining bolts and tighten nuts to finger tight.
- Finish with one final pass by providing torque in a clockwise direction.
- Tighten to 100% of estimated torque using the same sequence.

  Precautions during installation of Flanged Pipes :

· Flanged Pipes are mainly for over ground installation, Buried installation of flanged pipe is not recommended.

· Flanged Joint being a rigid joint , perfect alignment of the flange faces during jointing and bolt tightening is absolutely vital.

· Use of duck foot bend at bottom of vertical flange pipe line is necessary.

· For high pressure application, even flanged pipeline ( both horizontal & vertical ) needs thrust block / support at bends / tees.

Flange pipe laying from one side if from both sides , put flexible coupling or mechanical Joint coupling in between & avoid pulling the flanged pipes flanges from both ends.