Geroge, I know that sometimes a metallic path is provided to discharge static along a nonmetallic transfer system, but I don't consider that bonding or grounding of the nonconductive piping system. You can not make an effective grounding or bonding connection to a nonconductive object. Don
Re: Fiberglass piping in chemical atmospheres #30541 10/22/0304:42 PM10/22/0304:42 PM
Wouldn't the static buildup inside the piping, where the fluid flow is??? So wouldn't it follow that some type of wire inside the piping, possibly bonded to the core of the pipe. I've seen and installed lots of fiberglass piping. Never seen a static strap except on plastic(HDPE) piping that connected to a brass fitting at a termination
Re: Fiberglass piping in chemical atmospheres #30542 10/22/0304:51 PM10/22/0304:51 PM
Joe, That makes a lot more sense. Now we are bonding or grounding a conductive object, not just a nonconductive pipe. There is some information in the IEEE Green Book that says a bonding/grounding path with a resistance of up to 1,000,000 ohms is sufficient to prevent the build up of static charges. Don
Re: Fiberglass piping in chemical atmospheres #30544 10/23/0305:51 AM10/23/0305:51 AM
Don, There are many instances where a simple piece of PVC can harbor sufficient static to create an explosive atmosphere, especially along the inside wall of the pipe.
In these cases, you can also ty-wrap a simple piece of #12 alongside the outer edge to dissipate your charge. As long as it is continuous, the ohmic value can be as great as 1 meg with no harm to the value of the ground.