Installation Procedure

PTFE/PFA lined piping systems
When using smooth-running and greased bolts and nuts we recommend the tightening torques in the table below:

Ansi

For pressure rating Class 150

DN Torgue (Nm) Screws
1/2” 25 4 x 1/2”
3/4” 25 4 x 1/2”
1″ 30 4 x 1/2”
1 ½” 60 4 x 1/2”
2” 80 4 x 5/8”
3” 94 4 x 5/8”
4” 70 8 x 5/8”
6” 130 8 x 3/4″
8” 180 8 x 3/4”
10” 190 12 x 7/8”
12” 240 12 x 7/8”

Din

For pressure rating Class PN10/16

DN Torgue (Nm)  Screws 
15 38 4 x M12
20 38 4 x M12
25 38 4 x M12
32 53 4 x M16
40 53 4 x M16
50 68 4 x M16
65 69 4 x M16
80 72 8 x M16
100 75 8 x M16
125 120 8 x M16
150 135 8 x M20
200 172 8 x M20
250 143 12 x M20
300 172 12 x M20
350 210 12 x M20
400 233 16 x M24
500 240 20 x M27

1. Tightening the bolts

  • Insert the washers
  • Clean and grease bolts
  • Tighten nuts by hand
  • We have taken a friction coefficient of 0.14 (f=0.14) in account.
  • Tighten each bolt using a torque wrench, keeping to the torque values specified in the table.
  • The torque wrench should be used in a cross manner.
  • If a flange connection leaks, despite the fact that all bolts are tight, do not tighten further. Loose the connection, inspect the seal face and re-install.

2. Gaskets

It is a must to use MB-SURELINE®  S58 PTFE gaskets between the flange connection. They are special designed for PTFE/PFA lined piping systems.

All information and data quoted are based upon years of experience in the production and operation of sealing elements. This data may not be used to support any warranty claims. With its publication this latest edition supersedes all previous issues and is subject to change without further notice.

See Our PTFE & PFA lined pipe and fitting products