Natural GAS low pressure in building 4

[member22]

Why a 2" (6"wc) gas line to kitchen equipment comercial shell not be installed in a chase behaind the equipment? The sinior on the project said it is a no no, but did ot explain why?

 

[BigInch]

Any leaks would allow gas to fill up the inside of the chase volume, eventually working its way out to the equipment, which would then have a significant volume of gas ready to explode.

A leak in an exposed area would not accumulate, mixing off and diluting rapidly. The oder would undoubtedly alert someone to its presense before large volumes accumulated and became excessively dangerous.

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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[member22]

so all gas pipes in a building have to run exposed?
what about gas pipe in hung clg?

 

[PEDARRIN2]

Generally, you would want all your gas piping inside a building to be exposed - for that reason.

But since architects like to hide things like pipe and ductwork, we work with them.

Gas piping, at the pressure you are using, can usually be run above a ceiling or down a wall chase. If the above ceiling space is a plenum - you have to weld the piping and no valves are allowed.

Prior to occupying the building, the piping will have to be pressure tested for leaks. So once the piping passes the test, it is unlikely to leak - unless something moves or shifts.

 

[nhliew]

You can run your fuel gas pipe concealed in chases, embedded in walls, etc, but make sure all joints are welded. No flanges and threads are allowed. They are a a potential source of leaks, and you may not be able to gain access later for repairs or maintenance.

Your senior probably said no to it because the low pressure piping normally use threads.

 

[boot83]

Simply not true. and first off senior does not know then, because there is rules for every gas application and code prevails. it depends on the area where this is being installed so check local gas codes, but you can run them in a chase . or in concealed areas, as long as no unions or not less then half inch in size. so you should be fine. the whole idea of a pressure and soap test is to confirm no leaks in the first place, so where the piping is installed is pretty much a non issue. unless return air space etc, depending on how long chase is and how many offsets . someitmes at our company we will weld the pipe simply because they ask or it. but don't think we don't charge for it, state code that pertians, if they want more, give em a quote, they are not the ones paying for it anyways