Benchmark 2500 - 3000 Boilers
CHAPTER 2 – INSTALLATION
Page
22
of
207
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0F
09/30/2015
Ph.: 800-526-0288
GF-137
2.8 GAS SUPPLY PIPING
The AERCO Benchmark Gas Components and Supply Design Guide, GF-2030 must be
consulted prior to designing or installing any gas supply piping.
WARNING!
NEVER USE MATCHES, CANDLES, FLAMES OR OTHER
SOURCES OF IGNITION TO CHECK FOR GAS LEAKS
.
CAUTION
Many of the soaps used for gas pipe leak testing are corrosive to
metals. Therefore, piping must be rinsed thoroughly with clean
water after leak checks have been completed
.
NOTE
All gas piping must be arranged so that it does not interfere with
removal of any covers, inhibit service/maintenance, or restrict
access between the unit and walls, or another unit.
Benchmark 2500 and 3000 units contain a 2
inch (10.1 cm) NPT gas inlet connection on the top
of the unit as shown in Figure 2-2 AND 2-7.
Prior to installation, all pipes should be de-burred and internally cleared of any scale, metal
chips or other foreign particles. Do Not install any flexible connectors or unapproved gas
fittings. Piping must be supported from the floor, ceiling or walls only and must not be supported
by the unit.
A suitable piping compound, approved for use with natural gas, should be used. Any excess
must be wiped off to prevent clogging of components.
To avoid unit damage when pressure testing gas piping, isolate the unit from the gas supply
piping. The gas pressure applied to the unit
must NOT exceed 14” W.C. (3487 Pa)
at any
time. Leak test all external piping thoroughly using a soap and water solution or suitable
equivalent. The gas piping used must meet all applicable codes.
2.8.1 Gas Supply Specifications
The gas supply input specifications to the unit for Natural Gas are as follows:
•
The maximum static pressure to the unit must
not exceed 14” W.C. (3487 Pa)
•
The gas supply piping and pressure to the unit must be of sufficient capacity to provide
3000 CFH (84.9
m
3
/hr
)
while maintaining the gas pressure at
7 inches W.C.
(1744 Pa)
for FM gas trains
operating at maximum capacity
.
2.8.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream of the boiler as shown
in Figure 2-7. Maximum allowable gas pressure to the boiler is
14” W.C.
(3487 Pa)
.
2.8.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions
(see sections 2.8.3.1 and 2.8.3.2, below). Regulators must conform to the following
specifications:
