PTFE Lined Paddle Spacer 105

Traditionally, the problem has been addressed by keeping flow speeds at very low levels (0.8m/s is generally regarded as a good rule of thumb, but each case needs to be considered individually). Generally, this approach works well in a wide variety of situations. However, this method requires larger bore pipework than would otherwise be required, and there may be problems if the fluid contains suspended solids that are prone to dropping out of suspension from time to time.

Secondly, earthing spades have been inserted at pipe joints with exotic metals (such as Hastelloy) or conductive PTFE, both prevalent in the United States. Earthing spades are typically electrically connected to the pipework surrounding them. As a result of these spades, static charge in the fluid contained is dissipated at pipe joints to the surrounding pipework, reducing the overall charge level of the system. In metallic spades, there is the possibility for ion pickup from the metals, and with all types of spades, an additional leak path is introduced. CRP can supply earthing spades in both exotic alloys and conductive PTFE.

Using static dissipating materials, or antistatic PTFE, is the third approach widely used in the UK and other European countries. With a small amount of carbon (less than 5%), this PTFE material has lower electrical resistance, making it possible for any static charge build up inside the pipe to flow through the PTFE and into steel pipes surrounding it. CRP can supply various antistatic PTFE/PFA lined pipes and fittings. Although the antistatic PTFE used is FDA-compliant, the antistatic PFA is not FDA-compliant, as such material does not exist currently. CRP’s static dissipating piping products are briefly described at the end of this document.