Connect Gas Supply Piping - Weil-McLain EG Manual

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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 pressure drops, see ANSI Z223.1. Canadian
installations must 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:
d) Manifold gas pressure: 3Z\₂"
e) Install 100% lock-up gas pressure regulator
in supply line if inlet pressure exceeds 13"
adjust for 13" . . maximum.
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3. For propane gas:
a) Inlet gas pressure:
b) Manifold gas pressure:
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.
Table 11
Gas pipe capacities
Capacity of pipe sizes in
Adjusted
cubic feet of gas per hour **
length
of gas
supply
1"
¹⁄₂" ³⁄₄"
piping in
feet *
10 132 278 520
92 190 350
20
30 73 152 285
63 130 245
40
56 115 215
50
45 93 175
75
38 79 150
100
31 64 120
150
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
-
Gas firEd boilErs
:
5" . . minimum
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13" . . maximum
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. .
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. ., then
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11" . . minimum
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13" . . maximum
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10" . .
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. .
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1 ¹⁄₄" 1 ¹⁄₂" 2"
1,050 1,600 3,050
730 1,100 2,100
590 890 1,650
500 760 1,450
440 670 1,270
360 545 1,020
305 460 870
250 380 710
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sEriEs boilEr manual
5. Follow good piping practices.
6. Pipe joint compound (pipe dope) must be resistant
to corrosive action of liquified petroleum gases. Ap-
ply 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 servic-
ing. 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 ac-
cessories.
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.
Do not check for gas leaks with an open
flame – use bubble test. Failure to do so
can cause severe personal 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 pip-
ing during any pressure test greater than 13 inches
water column.
Figure 26
Gas supply piping
Part Number 550-110-639/0512