Leak Investigation
List 8 leakage test listed in the procedures leakage tests.
1.) Smell
2.) Visually Inspect
3.) Listen
4.) Soap Test
5.) Meter Test
6.) Manometer "u-gauge" Test
7.) Air Test
8.) Leak Detection Instrument (GMI)
The required air/gas ratio is the ratio of the volume of air required to burn 1 unit volume of Natural Gas completely without having any excess air in the combustion products.
10 cubic feet of air to 1 cubic foot of Natural Gas
These regulations cover systems for natural gas with an operating pressure of ____________ or less, and for LP-gas with an operating pressure of 20 psig. or less.....
101.2.2 125 pounds
House regulators control pressure by utilizing __________.
Spring Tension
What is the capacity of a 6" 250 BA meter?
What is the capacity of a 2lb 250 BA meter?
250 CFH
550 CFH
Grade 1
Grade 2
Grade 3
What are the grades for outside leaks
Grade 1 - A leak that is an existing or probable hazard and requires immediate repair
Grade 2 - A non-hazardous leak that should be repaired within 1 year not to exceed 15 months.
Grade 3 - A leak that is non-hazardous at time of detection and is expected to remain non-hazardous.
The Lower Explosive Limit (L.E.L.) and Upper Explosive Limit (U.E.L.) of Natural gas.
4 to 14% fuel to air ratio
What is the longest vent connector allowed for 20 inch vent?
What is 30 feet, Table 504.3.2. (page 100)
The house is protected by excess pressure through the ____________
Internal Relief
What is a split system meter set?
A system that utilizes both 6" or 1/4lb. pressure and 2lb. pressure.
Flame-resistant coveralls and GMI
What must be worn when working near blowing gas and must be used to monitor an area involved in a blowing gas situation.
The Heating value of Natural Gas
1000 BTU per cubic ft
Appliance pipe connectors shall have an overall length not to exceed __________.
411.1.3.1 6 feet
The ___________ must be installed before the internal relief can function properly.
Spring Cap
A red meter index indicates......
A compensating index for elevated pressures
When a damaged main or service is discovered, these areas should be monitored until repairs are complete.
Homes/Buildings
Crawlspaces/Basements
Foundations
Storm Drains
Water Meter Boxes
Gas Service Risers
A blue flame occurs when...
primary air is pre-mixed with the fuel.
A yellow insulated copper _________ wire or other approved conductor shall be installed adjacent to underground nonmetallic piping.
404.17.3 tracer
1 inch above set pressure.
Lock up
Which is the best dial to use to check for the presence of leaks
0.5 ft3
Before entering a home, building or any type of structure the GMI should have been....
Powered on in a fresh air environment and set to the LEL scale.
How much air is required for a 40,000 BTU water heater need for complete combustion?
400 CFH of air
Piping systems exceeding ___________ shall be welded.
402.6 What is 5 pounds
A small vent regulator should be.....
Replaced
If the 1/2 foot hand makes on revolution in 15 seconds, what is the consumption rate?
120 cfh