Gas Supply Piping - Dunkirk XEB-2 Installation, Operation & Maintenance Manual

Connecting The gas piping
Refer to Figure 12 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. Flexible gas connectors must never breach any boiler
openings.
Figure 12 - gAS pIpINg AT BOILEr
Automatic
Manifold Gas Valve
Floor Line
PRESSURE
MIN. SUPPLY
MAX. SUPPLY
MANIFOLD
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 Z223.1- latest revision. In Canada, follow the CSA B149.1
and .2 Installation Codes for Gas Burning Appliances and
Equipment.
2. All pipe compound must be resistant to liquefied petroleum gas.
3. Install ground joint union in gas supply line between shut-off
valve and boiler controls.
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 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.
Ground
Joint
Union
Sediment
Trap
Table 7
GAS
NATURAL PROPANE
5" w.c. 11" w.c.
14" w.c. 14" w.c.
3.5" w.c. 10" w.c.

gAS SuppLy pIpINg

!
Never use a match or open flame to test for leaks.
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 right away 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.
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 Gas Table 8 for the proper size.
Be sure your gas line complies with local codes and gas company
requirements.
Length of
Pipe - Ft.
20
40
60
Length of
Pipe - Ft.
20
40
60
*Outside diameter:
The length of pipe or tubing should be measured from the gas meter or propane
second stage regulator.
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 ½ Psig (3.5 kPa).
The boiler must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure test-
ing of the gas supply piping system at test pressures equal to or less
than ½ Psig (3.5 kPa).
22
WARNING
Table 8a - NATURAL GAS
Pipe Capacity - BTU Per Hour Input
Includes Fittings
½" ¾"
92,000 190,000 350,000
63,000 130,000 245,000
50,000 105,000 195,000
Table 8b - PROPANE GAS
Pipe Capacity - BTU Per Hour Input
Includes Fittings
Copper Tubing*
⅝"
¾"
131,000 216,000 189,000
90,000 145,000 129,000
72,000 121,000 103,000
1" 1¼"
625,000
445,000
365,000
Iron Pipe
½" ¾"
393,000
267,000
217,000