AERCO BMK 6000 Dual Fuel - Manual (Page 83)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 83 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
6.3 HIGH GAS PRESSURE FAULT TEST
To simulate a high gas pressure fault, refer to Figure 6-1B and perform the following steps. The
instructions below apply to both the Natural Gas and Propane gas trains.
Figure 6-1B. High Gas Pressure Test
High Gas Pressure Fault Test
1. Remove the 1/4“ plug from the Tee next to the NATURAL GAS High Gas Pressure Switch,
shown in the upper half of Figure 6-1B.
2. Install a NPT-to-barbed fitting and a 0 – 16” W.C. manometer where the 1/4” plug was
removed. Open the ball valve at the High Gas Pressure switch.
3. Apply the readings of the manifold pressure taken in Step 11 of section 4.4 (for Natural
Gas) and Step 10 of section 4.5 (for Propane), and plug them into the following formulas,
which calculate the maximum allowable gas pressure:
•
Natural Gas Pressure  ______ x 1.5 = ______ max gas pressure
•
Propane Gas Pressure  ______ x 1.5 = ______ max gas pressure
4. Remove the cover from the High Gas Pressure switch and set the dial indicator to 20 (the
maximum).
NATURAL GAS
HIGH GAS PRESSURE
SWITCH
(10.5” W.C.)
PROPANE HIGH GAS PRESSURE SWITCH
(6.3” W.C.)
GAS
INLET
TO AIR/FUEL
VALVE
NATURAL GAS
TEE with 1/4" PLUG
(Install manometer
here for HIGH GAS
PRESSURE test)
MANUAL SHUT-
OFF VALVE
PROPANE
TEE with 1/4" PLUG
(Install manometer
here for HIGH GAS
PRESSURE test)
DOWNSTREAM
SSOV with POC
SWITCH