Connect Gas Supply Piping - Weil-McLain 5 Series Manual

EG PEG
&
SERIES

Connect gas supply piping

Connecting gas supply piping
1. Size gas piping considering
a) Diameter and length of gas supplying piping.
b) Number of fittings.
c) Maximum gas consumption (including any possible future
expansion).
d) Allowable loss in gas pressure from gas meter outlet to boiler. For
comply with CAN/CSA B149.1 or B149.2 Installation Codes.
2. For natural gas:
a) Refer to Table 11 or the National Fuel Gas Code. To obtain cubic
feet per hour, divide the input by 1000.
b) Size for rated boiler input.
c) Inlet gas pressure: 5"
13"
d) Manifold gas pressure: 3¹⁄₂"
e) Install 100% lock-up gas pressure regulator in supply line if inlet
pressure exceeds 13"
W
3. For propane gas:
a) Inlet gas pressure: 11"
13"
b) Manifold gas pressure: 10"
c) Gas pressure regulator provided by gas supplier must be adjusted
for maximum pressure of 13"
d) Contact gas supplier to size pipes, tanks and regulator.
4. Remove knock-out disc from jacket panel which gas supply
is to be piped.
5. Follow good piping practices.
Gas pipe capacities
Capacity of pipe for pipe sizes in
Adjusted
cubic feet of gas per hour **
length
of gas
supply
½" ¾"
piping in
feet *
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
75 45 93
100 38 79
150 31 64
Notes *
Include measured length of gas supply piping and allowance
in feet for number and size of fittings.
**
Specific Gravity - 0.60; Pressure loss - 0.30" w.c.
22
5 EGH 5
SERIES
:
. . minimum
W C
. . maximum
W C
. .
W C
. ., then adjust for 13" . . maximum.
C W C
. . minimum
W C
. . maximum
W C
. .
W C
. .
W C
1" 1¼" 1½"
520 1050 1600
350 730 1100
285 590 860
245 500 760
215 440 670
175 360 545
150 305 460
120 250 380
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GAS FIRED BOILERS
6. Pipe joint compound (pipe dope) must be resistant to cor-
rosive action of liquefied petroleum gases. Apply sparingly
only to make threads of pipe joints.
7. Install drip leg at inlet of gas connection to boiler. Where local
utility requires, extend drip leg to floor.
8. Install ground joint union when required for servicing. See
Figure 26.
9. Install manual shut-off valve outside boiler jacket as shown
in Figure 26 when required by local codes.
10. Support piping by hangers, not by boiler or its accessories.
11. In Canada only, the manual main shut off valve (when used)
must be identified by the installer.
12. Purge all air from piping.
13. Before placing boiler in operation, check boiler and its gas
connection for leaks.
bubble test. Failure to do so can cause severe per-
sonal injury, death or substantial property damage.
a) Close manual main shut-off valve during any pressure testing
at less than 13 inches water column.
b) Disconnect boiler and gas valve from gas supply piping during
any pressure test greater than 13 inches water column.
Gas supply piping
2"
3050
2100
1650
1450
1270
1020
870
710
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BOILER MANUAL
Part Number 550-142-782/1112