Brochure

Gastite Division, Titeflex Corporation
1116 Vaughn Parkway / Portland, TN 37148
800.662.0208 / www.gastite.com / [e-mail]
94
April 2015
Section 7: Sizing Tables and Pressure Drop Charts
7.8 Reference Data
Table 7-25
Pressure Conversion Factors Fuel Gas Information
1/4 PSI = 6.921"WC = (approx. 7"WC)
Natural Gas Propane
1/2 PSI = 13.842"WC = (approx. 14"WC) BTU per Cubic Foot = 1000 2516
1 PSI = 27.684"WC = (approx. 28"WC) Specific Gravity = 0.60 1.52
2 PSI = 55.368"WC = (approx. 56"WC)
Note: “Pressure Drop Curves for FlashShield CSST” are expressed
in terms of Cubic Feet per Hour (CFH). To determine the CFH for
Natural Gas, divide the BTU load by 1000. To determine the CFH
for Propane, divide the BTU load by 2516.
5 PSI = 138.42"WC = (approx. 140"WC)
Table 7-26
Pressure Conversion Factors Fuel Gas Information
Gas piping systems that are to be supplied with gas of a specific gravity other than 0.60 shall apply a specific gravity factor.
e conversion is accomplished by multiplying the capacities given in the tables, charts and graphs by the appropriate
multiplier from the table below. In case the exact specific gravity does not appear in the table, choose the next higher
value shown. Check with the local gas utility or supplier for the correct specific gravity.
Options:
1. Using Table A-5 the flow capacity of 1/2" CSST at 50 ft, for natural gas with a specific gravity of 0.60 is 266
CFH. At a specific gravity of 0.65 the resultant value in the table will be 255 CFH (266 x 0.96).
or
2. A furnace rated at 80,000 BTUH natural gas with a specific gravity of 0.60 will be rated at 76,800 BTUH natural
gas with a specific gravity of 0.65 (80,000/0.96).
Specific Gravity Multiplier Specific Gravity Multiplier
0.35 1.31 1.00 0.78
0.40 1.23 1.10 0.74
0.45 1.16 1.20 0.71
0.50 1.10 1.30 0.68
0.55 1.04 1.40 0.66
0.60 1.00 1.50 0.63
0.65 0.96 1.60 0.61
0.70 0.93 1.70 0.59
0.75 0.90 1.80 0.58
0.80 0.87 1.90 0.56
0.85 0.84 2.00 0.55
0.90 0.82 2.10 0.54