Pipe Anchors Using Lateral/Angular Expansion Compensators FA1, FA2, AN1, AN2, GI1, GI2

It is preferable to install the above type of Expansion Compensators if the engineer has concerns over Anchor Loads. The Anchor Loads created by the use of these units are significantly lower than the load created by using an Axial Expansion Compensator.

Anchor Loads using Lateral/Angular Expansion Compensators are created from Two Fields

  1. The Force To Deflect the Expansion Compensator.
  2. The Force Created Due to Frictional Resistance.

For the force to deflect, the information can be found earlier in this guide for DST Type DST/AN1/PN16. In this case 100mm it will be:

Force to Deflect Each Expansion Compensator = 98N/deg x 2 = 196.00 Newtons

For the force to overcome friction, we will be bracketing using DST 114 Roller Chair and Guide, which has a frictional resistance of 30 Newtons.

Force to Overcome Frictional Resistance = 15 x 90 x 100/25 = 5400 Newtons


Therefore the Total Anchor Force will be:

1 = 196 Newtons + 2 = 5400 Newtons


Anchor Load Total = 5596 Newtons


As you can see, the majority of the Anchor Load is made up from the frictional resistance of pipework bracketry. It is advisable to use pipework bracketry which has a low frictional resistance such as a DST 253 Slide Guide. Please seek further advice from our technical sales team on frictional resistance and further pipework bracketry.

These types of Expansion Compensators can be used on a drop rod system.