COUGAR ELECTRIC LLC
RESIDENTIAL & COMMERCIAL STAND-BY GENERATORS
In order to provide the rated power (Kw) that you paid for, your generator MUST have an adequate fuel supply.
This will involve a new larger gas meter if you are using natural gas or a larger tank size for LP fueled units.
All of the gas piping between the utility gas meter and the generator MUST be installed and pressure tested by a properly licensed and qualified plumbing/mechanical contractor and requires a "Gas Piping Permit" & Inspection!
Your gas meter MUST be capable of supplying the full load BTU requirements of your generator AND the full load BTU requirements of ALL other gas appliances with a pressure drop of no more that 1/2" of W.C.
For residential air-cooled generator installations this will require an upsized N.G. gas meter. Larger homes, commercial, or liquid cooled generator installations will likely require a much larger N.G. meter.
Meter & Regulator Installation Upsized N.G. Meter
In addition to increasing the meter size the gas piping from the gas meter to the generator must be adequate as well. The size of the line will depend on the size of the generator and the distance between the gas meter and the generator. This distance MUST be measured as the total length of piping including fittings; NOT the straight line distance between the two.
Note: 1/2" gas pipe is NOT approved for ANY generator installation!
GAS PIPE SIZING IS ONE OF THE MOST COMMONLY MADE MISTAKES. A PROPERLY SIZED GAS PIPE IS CRITICAL TO THE PROPER OPERATION OF THE GENERATOR. THE GENERATOR INLET SIZE HAS NO BEARING ON THE PROPER GAS PIPE SIZE.
THE GAS SUPPLY AND PIPE MUST BE SIZED AT 100% 0F THE GENERATOR BTU RATING.
Generator Service Connection
The 1 1/4" gas line shown here directly serves a 20Kw generator by the 1 1/4" discharge line from the meter. The 1 1/4" to 1" reducing tee serves the 1" gas line to the residence supplying the domestic gas appliances.
This is a CRITICAL step! The generator gas supply must NEVER be tapped from the gas line inside the building. It MUST be a dedicated gas line of adequate size run directly from the meter to the generator.
"Full Flow Rated" shut-offs for the Natural Gas MUST be installed at the meter AND at the generator. This is a CRITICAL safety issue and MUST NOT be omitted!
LP VAPOR (LPV)
With LPV generator installations the critical item is TANK SIZE. Your LP tank must be capable of supplying the full load BTU requirements of your generator AND the full load requirements of ALL other connected LP appliances; with a pressure drop of no more that 1/2" of W.C. at the COLDEST temp expected at the install location.
This is a CRITICAL step! The generator LP gas supply must NEVER be tapped from the LP gas line supplying the building. There MUST be a dedicated high pressure LP gas line run directly from the LP tank to the primary regulator supplying the generator.
"Full Flow Rated" shut-offs for the LPV MUST be installed at the tank AND at the generator. This is a CRITICAL safety issue and MUST NOT be omitted!
If your fuel supply is inadequate you are simply NOT getting the performance and/or Kw capacity that you paid for. In addition it can cause rough and erratic engine operation, engine stalling under load, "Lean Burn" engine damage, and power fluctuations. These are install issues NOT covered by the GENERAC factory warranty.
Give us a call today. We can review your installation and recommend any changes necessary to get your generator system operating at peak performance!
Cougar Electric LLC @ 810-691-2684
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Page last Edited @ 03/13/2014 12:00 PM