gas pipe sizing

Unknown

http://www.regoproducts.com/Old/LPmanual.htm

http://www.maxitrol.com/PDFs/LPROPD_GB_EN_06.2006.pdf

jrh

gas pipe sizing

does anybody know where i can find a chart to size high pressure gas pipe capacities? i am running 400 feet of of natural gas at two pounds and need to feed 800,000 btus at that point. any help would be appreciated
jh

ALH_4

Gas Code

National Fuel Gas Code

Brad White_145

Total Pressure Drop?

Depends on what your local code or utility dictates for a total pressure drop. I take it that the two pounds is the available pressure? Here in MA we are limited to 1/2 lb, [14"WC] inside a building by the way, without special permit. Do check.

If I were sizing that pipe here in MA and assuming the 400 feet is total developed length and a total pressure drop for the run of 0.20 inches, the size would be 3-inch. This would cover between 700 and 1100 CFH. Put another way, with a 3-inch line you could go even longer.

Empire_2

Hi Pressure line

Figuring a .5 pressure loss,...2 1/2" is the size on my dial calculator. 2" would be too small. 2 1/2" will supply up to 1000, cu/ft/hr.

Mike T.

Bob D_3

I would be very afraid if my plumber didn't know where to find such information. What's that smell anyway.

Robert O'Connor_12

jh



"If" you are a design professional, I'd look it up in the 2003 International Fuel Gas Code Chapter 4. It would be helpful to first know the pressure drop of this system and also include the type of material used when asking your question. The tables within this code are based on a given pressure drop and cannot be used if the designer wishes to use any other pressure drop. The sizing tables are based on using smooth-bore pipe. Pipe materials with higher resistance to flow (ie: CSST) cannot be sized according to these tables and must use the CSST-specific tables. More information on sizing is available from various sources, although I prefer the Piping Handbook by Sabin Croker and the ASHRAE Handbook of HVAC Systems and Equipment.

If you use the Appendix A, A2.2 and A.2.3, an equivalent length of pipe should be added to the length of any piping run having more fittings. Many designers simply add 50% of the actual length of piping as an all-inclusive fitting allowance (ie: actual pipe length x 1.5). This is a conservative estimate and is used because the necessary number and type of fittings is usually not know (as an example of your own question) when the system is being designed.

According to the "limited" information provided, if applying the interpolation as stated above. according to 2003 IFGC Table 402.4(3), and assuming you will be using Schedule 40 Metallic Pipe, Inlet Pressure 2.0 psi & Pressure drop of 1.0 psi & Specific gravity @ 0.60, 1" inch @ 200'feet will deliver 1,174 Cubic Feet of Gas per Hour. Providing answers on an Internet message board "for free" will undoubtedly only get you so much and likely get you into trouble with the AHJ. I'll now suggest you either contact me "off-line" or entertain the idea of hiring a "design professional".


Robert O'Connor/NJ

John Starcher_4

Well, Bob......

....I believe he DID know where to find it.

Right here on the Wall!!!!

Starch