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AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
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Ph.: 800-526-0288
07/21/11
GF-5030
TAG-0044_0A
Gas Supply Design Guide
CAUTION!
THE AERCO HEATERS MUST BE ISOLATED FROM THE SYSTEM WHEN
LEAK TESTING.
Drip legs are typically required at the gas supply of each heater to prevent any dirt, weld slag, or debris from entering
the heater gas train inlet pipe. When multiple heaters are installed, some utilities and local codes require a full size drip
leg on the main gas supply line in addition to the drip leg at each unit. The bottom of the gas drip leg(s) should be
removable without disassembling any gas piping. The weight of the gas pipe should not be supported from the bottom
of the drip leg. The drip leg(s) should not be used to support any or part of the gas piping.
Diagram 1. Single Heater Pipe Connections
Custom Gas Trains
Some utilities, insurance carriers, and industrial customers have special requirement gas components on high input
devices beyond that which are normally supplied with AERCO heaters. Secondary shutoffs, high or low pressure
operators, and external regulators are typical of the requirements of gas utilities. It is mandatory that a designer or
installer comply with these requirements. AERCO assumes no liability when these requirements are not satisfied for
any location or installation. Contact your local gas utility for their specific requirements before installing AERCO
equipment. Special gas trains with a double block and bleed (DBB) configuration (formerly IRI) are available from
AERCO. Gas inlet pressure requirements are as follows:
Gas Train
Natural Gas Side
DBB
7.0” W.C.
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