Honeywell RM7800L1087 - Page 28

RM7800L1087; RM7840G1022,L1075; EC7840L1014 RELAY MODULES WITH VALVE PROVING
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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
10.864
1-1/4 1.498
1-1/2 2.036
23.356
2-1/2 4.788
37.393
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