CRP Spikies Earth Continuity Rings 

The Problem
Ever since the first large scale chemical and pharmaceutical plants were constructed there have been issues with earth continuity on process plant. In Spikie the broadest sense these problems arise as follows:
- A build up of an electrical charge on a piece of  equipment occurs.
- The charge is discharged as a spark.
- If an explosive of flammable atmosphere is present when the spark is created, this can lead to a fire or an explosion.

Dealing with each of these in turn:
Electrical charge build up
This can occur for many reasons. In the extreme it can be caused by a lightning strike, but more common causes are things such as a fault on a piece of electrical equipment, or electrostatic charging due to the flow of a non-conducting fluid past a non-conducting surface, or the rubbing together of two non-conducting surfaces. 
Creation of a spark
If two items with different electrical charges are brought into proximity of each other there is a tendency for the charges to try to balance out. If the items are conductors and they are in contact with each other then a current will flow from one to the other to balance the charge. However, if they are simply near to each other, if the charge difference is sufficiently great, this will result in a spark jumping between the two. The larger the charge difference, the greater the gap that can be jumped, and the larger the spark that can be created. Alternatively, with a fixed level of charge, as two items approach each other, eventually they will be sufficiently close together for a spark to be created. 
Triggering of an explosion or fire
If the atmosphere in the vicinity of a spark contains the correct proportions of materials, and the spark is of sufficient energy, this can trigger a fire or an explosion. There are many combinations of gases and dusts that can cause an atmosphere to be flammable or explosive, but suffice to say that over the years, there have been many documented cases of explosions and fires ignited by electrical sparks in such atmospheres.
CRP Spikies
In order to address the issue of earthing rotating flanged components CRP has developed its range of Spikies®.
Spikies® are simply slipped into place between the loose flange and stub end on a pipe spool or fitting, and the joint made using star washers and studs as on a fixed flange joint. Once in place the centring lugs ensure that the raised points on the Spikies® are positioned to bite into the front of the flange face and the back of the stub end, thus providing earth continuity from rotating flange to fitting / spool.
The extensive design, development and testing programme for Spikies® has ensured that the optimum spring steel substrate and nickel corrosion protection coating materials have been used, along with a design that makes Spikies® a truly durable fit and forget solution to process plant pipework earth continuity issues.
Cost and Reliability
The spikie provides a robust and cost effective solution to achieving earth continuity between the pipe body and a rotating flange.  It can be supplied factory fitted or can easily be retro-fit in the field.

For further information on ATEX requirements please click here 

Contact Details

Corrosion Resistant Products Ltd
Todmorden Road
OL15 9EG

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

Further Information