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RM7800L1087; RM7840G1022,L1075; EC7840L1014 RELAY MODULES WITH VALVE PROVING
66-1162—2
28
Table 15. Schedule 40 Pipe Internal Cross-Sectional Area.
Table 16. VPS Worksheet.
a
Divide inches w.c. by 27.7 to get psi.
b
Divide Btuh by 1000 to get cf/hr for natural gas or by 2550 to get cf/hr for LP gas.
Pipe Size NPT (Inches)
Cross-Sectional Area (Sq. In.) “A”
3/8
0.191
1/2
0.304
3/4
0.533
1
0.864
1-1/4
1.498
1-1/2
2.036
2
3.356
2-1/2
4.788
3
7.393
4
12.730
Item
Description
Information
Lookup Table
Results
Formula Item
V1
Upstream Valve Volume
12
V1
V2
Downstream Valve Volume
13
V2
D
Pipe Size NPT (in.)
14
A
L
Pipe Length (ft)
—
L
P
Valve Inlet Pressure (psig)
a
—
P
C
Burner Maximum Firing (cf/hr)
b
—
C