LAARS Heating Systems
Page 18
SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC
GRAVITY UNDILUTED PROPANE
NOMINAL PIPE SIZE
@
11” W.C. INLET AND 0.5” W.C.
PRESSURE DROP
SIZE 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LENGTH MAXIMUM CAPACITY IN THOUSANDS OF BTU PER
HOUR
20 200 418 787 1616 2422 4664
40 137 287 541 1111 1664 3205
60 110 231 434 892 1337 2574
80 94 197 372 763 1144 2203
100 84 175 330 677 1014 1952
Notes:
1. Follow all local and national LP gas codes for line sizing and
equipment requirements.
2. Verify that inlet gas pressure remains between 4 and 13 inches
of water column before and during operation.
Source: ANSI Z223.1-80 National Fuel Gas Code.
Table 6D - Pipe Capacity for Propane
EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL
SCH 40 FITTINGS
NOMINAL PIPE SIZE
FITTING 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LINEAR FEET
90° ELBOW 3.6 4.4 5.2 6.6 7.4 8.5
TEE 4.2 5.3 6.6 8.7 9.9 12
Table 6B - Equivalent Pipe Lengths
NeoTherm LC
NATURAL GAS
REQUIRED
CU FT
SIZE / HR.
1000 1000
1700 1700
TO SIZE PIPING:
Measure linear distance from meter outlet
to last boiler. Add total input of all boilers
and divide by 1000 to obtain cu ft / hr
required. Add total equivalent length of
ttings used according to Table 6B. Align
total length (pipe and ttings) on left side
column of Table 6C with highest cubic feet
of gas required.
Notes:
Consult and conrm with Applicable Fuel
Gas Code before beginning work.
Verify gas inlet pressure is between 4 and
13 in W.C. before starting boiler.
Table 6A - Natural Gas Requirements
SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY
NATURAL GAS
NOMINAL PIPE SIZE
@
0.30” W.C. PRESSURE DROP
LENGTH 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
FT CUBIC FEET OF GAS PER HOUR
20 92 190 350 730 1100 2100
40 130 245 500 760 1450
60 105 195 400 610 1150
80 90 170 350 530 990
100 150 305 460 870
Table 6C - Pipe Capacity for Natural Gas
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