Commercial Fuel Gas Vents

[globe trekker]

I am looking for some input from the Forum.

I have a Fabricating Plant with a piece of equipment that has natural gas

being supplied to it. The regulators on the gas supply line have vent

lines attached and connected to a common black steel pipe that vents

to the outdoors. The natural gas supply line is a wet gas system.

QUESTION: Does this type of vent line need to be sloped for

condensate disposal, or is a horizontal installation acceptable?

FWIW, at the disposal point (outdoors), there is a screen on the end

of the pipe, in agreement with the 2006 IFGC, Section 416.5.5.

Also, I do not have any manufacturer's literature on the equipment.

Thanks ya'll!

 

[Gregg Harris]

I am looking for some input from the Forum.I have a Fabricating Plant with a piece of equipment that has natural gas

being supplied to it. The regulators on the gas supply line have vent

lines attached and connected to a common black steel pipe that vents

to the outdoors. The natural gas supply line is a wet gas system.

QUESTION: Does this type of vent line need to be sloped for

condensate disposal, or is a horizontal installation acceptable?

FWIW, at the disposal point (outdoors), there is a screen on the end

of the pipe, in agreement with the 2006 IFGC, Section 416.5.5.

Also, I do not have any manufacturer's literature on the equipment.

Thanks ya'll!

Drop back to 410.3 for venting for pressure reducing valves, and should be graded upwards.

 

[Gregg Harris]

Also look at 408 for slopes and drips for wet gas. The vent having a vertical slope is for gravity venting and not condensation and should be increased in size when multiple regulators are tied together as in 410.3.1

 

[globe trekker]

Thanks Gregg for the input!

So that I am clear, regarding Section 408.1 (in this case), the vent piping

should be sloped upward to the outdoors a minimum of 1/4" per 15 ft. of

piping from *the combined regulators into a central vent pipe*

application? Also, a drip or a sediment trap should be installed in this

wet gas system?

Thanks!

 

[Gregg Harris]

Thanks Gregg for the input!So that I am clear, regarding Section 408.1 (in this case), the vent piping

should be sloped upward to the outdoors a minimum of 1/4" per 15 ft. of

piping from *the combined regulators into a central vent pipe*

application? Also, a drip or a sediment trap should be installed in this

wet gas system?

Thanks!

That would be correct, the specific gravity of the natural gas at 0.60 being lighter than air will have a friction rate to overcome inside of the pipe and the volume from multiple reliefs are manifolded the pipe increases towards the point of relief.

Even though a sediment trap and drip leg are designed the same, a drip leg will be referenced to wet gas and a sediment trap to dry gas.

 

[globe trekker]

Much thanks to you Gregg! This info will work very nicely!