Product Manual A

4. Installation 7-2018

Testing the Fuel System for Leaks

After assembly and before initial operation, all of the fuel system components must

be tested and proven free of any leaks.

WARNING

Fuel presents the hazard of explosion or fire which can result in severe

personal injury or death. Do not use an open flame to check for leaks. Do not

smoke or allow any flame, spark, pilot light, arc-producing equipment, switch

or other ignition sources around fuel or fuel components. Keep multi-type

ABC fire extinguishers close by.

NOTICE

Follow any local codes and standards, as they may require a different

method or documentation of a leak test.

Perform the following fuel piping system leak check:

1. After assembly and before initial operation of generator set, test all fuel system

components as required per the National Fuel Gas Code (NFPA 54).

2. The National Fuel Gas Code requires that the generator set be isolated from

the piping system by disconnecting it and capping the outlet prior to test. The

test pressure required is the greater of 1.5 times the supply pressure or 3 psi

(20.7 kPa) minimum.

3. After successfully completing the previous step, connect the generator set to

the fuel piping system.

4. To verify that all connections from the fuel piping system to the generator set

are free of leaks, conduct a bubble test using an approved leak detection

solution (or equivalent method) with the system pressure of 0.8 to 1.0 psi (5.5 to

7.0 kPa).

5. Spray the bubble solution on all of the joints.

6. Inspect all of the joints and monitor the line pressure. If bubbles appear, there is

a leak.

7. If any leaks are found, repair the joint or replace components as needed.

8. Verify the leak has been fixed.

NOTICE

The leak detection solution (that is, bubble solution) must be non-corrosive

and be free of ammonia and chlorine.