10
CHECK GAS SUPPLY
The gas pipe to your boiler must be the correct size for the
length of the run and for the total Btu per hour input of all gas
utilization equipment connected to it. See Fig. 12 for the proper
size. Be sure your gas line complies with local codes and gas
company requirements.
The boiler and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing
of that system at test pressures in excess of 1/2 psig (3.5 kPa).
The boiler must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pres-
sure testing of the gas supply piping system at test pressures
equal to or less than 1/2 psig (3.5 kPa).
CONNECTING THE GAS PIPING
Refer to Fig. 13 for the general layout at the boiler. It shows
the basic fittings you will need. The gas line enters the boiler
from the right side.
The following rules apply:
1. Use only those piping materials and joining methods listed
as acceptable by the authority having jurisdiction, or in
the absence of such requirements, by the National Fuel
Gas Code, ANSI 223.1-latest revision. In Canada, follow
the CAN/CGA B149.1 and .2 Installation Codes for Gas
Burning Appliances and Equipment.
2. Use pipe joint compound suitable for LP gas on male
threads only.
3. Use ground joint unions.
4. Install a sediment trap upstream of gas controls.
5. Use two pipe wrenches when making the connection to
the gas valve to keep it from turning.
6. Install a manual shut-off valve in vertical pipe about 5
feet above floor.
7. Tighten all joints securely.
8. Propane gas connections should only be made by a
licensed propane installer.
9. Two-stage regulation should be used by the propane
installer.
10. Propane gas piping should be checked out by the
propane installer.
CHECKING THE GAS PIPING
Upon completion of piping, check immediately for gas leaks.
Open the manual shut-off valve. Test for leaks by applying soap
suds (or a liquid detergent) to each joint. Bubbles forming indicate
a leak. CORRECT EVEN THE SMALLEST LEAK AT ONCE.
WARNING
Never use a match or open flame to test for leaks.
Gas Supply Piping
FIG. 12 - GAS PIPE SIZES
Length of
Pipe - Ft.
1/2"
3/4"
1"
1¼"
20
92,000
190,000
350,000
625,000
40
63,000
130,000
245,000
445,000
60
50,000
105,000
195,000
365,000
Length of
Pipe - Ft.
5/8"
3/4"
1/2"
3/4"
20
131,000
216,000
189,000
393,000
40
90,000
145,000
129,000
267,000
60
72,000
121,000
103,000
217,000
Copper Tubing*
Iron Pipe
Pipe Capacity - Btu Per Hour Input
Includes Fittings
NATURAL GAS
PROPANE GAS
Pipe Capacity - Btu Per Hour Input
Includes Fittings
* Outside diameter
The lenght of pipe or tubing should be measured from the gas
meter or propane second stage regulator.
FIG. 13 - GAS PIPE SIZES
Summary of Contents for PVWB
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