Clamp on gas flow meters and Type X pressurization

[Aaron Bath]

The topic of using a small Type X pressurized enclosure around a clamp on gas flow meter came up today. What threw me off was that the clamp on gas meter would require a tube carrying gas to enter and exit the enclosure. Is this idea even possible in a class 1 div 2 environment?

 

[Elect117]

Like this?

Z Purge

Purge and pressurization systems play a vital role in protecting electrical enclosures and control panels in hazardous environments, preventing the ignition of flammable gases, vapors, or dust. In our latest article, we explore their importance, compare Z-purge and X-purge systems, and highlight...

www.panelmatic.com

I don't see how you can bring the hazardous gas into the enclosure and keep it purged / pressured. But a part of the design is to have a inert gas line in and out of the enclosure ensuring that the air inside of the enclosure can not contain enough hazardous gas to explode. Basically making a positive pressure inside of the enclosure so no gas can be sucked into the enclosure or seep in to the enclosure.

Sorry, when you say gas, are you talking about explosive gas that is creating a hazard or the inert gas used to pressurize the enclosure?

 

[Aaron Bath]

Like this?

Z Purge

Purge and pressurization systems play a vital role in protecting electrical enclosures and control panels in hazardous environments, preventing the ignition of flammable gases, vapors, or dust. In our latest article, we explore their importance, compare Z-purge and X-purge systems, and highlight...

www.panelmatic.com

I don't see how you can bring the hazardous gas into the enclosure and keep it purged / pressured. But a part of the design is to have a inert gas line in and out of the enclosure ensuring that the air inside of the enclosure can not contain enough hazardous gas to explode. Basically making a positive pressure inside of the enclosure so no gas can be sucked into the enclosure or seep in to the enclosure.

Sorry, when you say gas, are you talking about explosive gas that is creating a hazard or the inert gas used to pressurize the enclosure?

I am taking about a hazardous gas. It would be kept separate in a pipe, but having thought about it more I agree there isn't a way to do this. If the pipe or hose leaked then there would be nothing protecting the electronics inside the enclosure. Pressurization wouldn't do anything to help with an internal leak.

 

[retirede]

Pressurization wouldn't do anything to help with an internal leak.

Depends on the pressures.

 

[petersonra]

The topic of using a small Type X pressurized enclosure around a clamp on gas flow meter came up today. What threw me off was that the clamp on gas meter would require a tube carrying gas to enter and exit the enclosure. Is this idea even possible in a class 1 div 2 environment?

The answer may lie in pressurizing just the gas meter junction box.

ETA: however, I seem to recall some requirements for double seals between the process fluid and the junction box that would need to be met.

 

[petersonra]

The answer may lie in pressurizing just the gas meter junction box.

ETA: however, I seem to recall some requirements for double seals between the process fluid and the junction box that would need to be met.

Missed my editing window.

I think if it is truly clamp on, the seals would not matter though. But it's hard to know for sure what the OP means by clamp on.