Earthing and Venting Options

Earthing
To help prevent static build up on piping systems which can result in plant explosions, an effective earthing system must be employed to make sure that all the steel piping is properly earthed.  CRP have developed it’s own Spikie earthing washer for use with rotating flanges – further information can be found here. Along with these we can offer various types of earthing solutions, including welded M5 or M6 studs, carbon or stainless steel lugs etc. Typically these systems have been developed to conform to customer’s site specifications and can be applied to any of our pipe spools, fittings, sight glasses or valves. It is worth mentioning that to prevent static build up within the bores of the piping static dissipating liners must be employed too.  Shown below are typical earthing stud locations, CRP recommend that the main body of a spool / fitting should have a stud / lug and any rotating flanges should have a stud / lug fitted too.

Typical earthing stud locations
 
Venting
Pipe Spool Vent Bosses

All lined piping systems must have vent holes drilled into the steel body. This is for 2 reasons, firstly to vent any gasses that may permeate through the liner over time to the atmosphere rather than allow them to build up behind the liner trapped within the steel pipe, this is certainly unwanted as the corrosive gasses would corrode the steelwork eventually causing a steelwork failure, secondly if the liner were to fail for any reason then the leak would manifest itself immediately at the vent hole rather than build up behind the steel, again eventually causing a major steelwork failure. When the lined piping is to be insulated with lagging on site it is important that these vent holes are not blocked or covered, to ensure this does not happen vent bosses are welded to the steelwork over the hole position and then short extension pipes are screwed to these to vent the piping clear of the insulation.

Vent Extension  Pipe spool shown here with standard welded vent boss and 65mm vent extension
 EDS Pip Vent Extension Welded boss, EDS PIP type vent extension complete with PTFE vent plug
 PTFE Vent Plug Vent boss with PTFE vent Plug

 

Vent bosses and earthing studs can be supplied with most of our products.

Contact Details

Corrosion Resistant Products Ltd
Todmorden Road
Littleborough
OL15 9EG

Phone: +44(0)1706 756400
Fax: +44(0)1706 379567
Email: