Gas Piping Flashcards
All gas lines must be buried ___”
Gas lines under a parking lot or drive way must be ___”
15”
24”
Approved methods for joining pipe underground?
Welding
Mechanical compression fittings
Flared fittings
Heat fusion
Does steel pipe in residential applications require identification?
No
Copper tubing in residential applications must have yellow bands at __’ intervals?
6ft
A gas shut off may be installed on the horizontal piping as long as it is within 2’ of the appliance, it can also be installed within 50’ away from an appliance as long as it is accessible and clearly tagged?
True/false
True
Gas lines must NOT be supported by another pipe or by the appliance it is servicing?
True /false
True
All gas lines should be supported on the horizontal portion at a drop or rise?
True / false
True
Threaded sch. 40 pipe may be used for pressures not exceeding ____psi
125psi
Natural rubber can be used as gasket material?
No
Can a defective section of gas piping be repaired by a qualified gas fitter?
No
A hose maybe be used to connect a unvented appliance when ?
When it is mobile or requires isolation from vibration
A corrugated metal connector shall not exceed 2’ in length when ?
Connecting a suspended appliance or decorative appliance
Plastic piping shall only be used for ?
Outdoor or underground service
Nesting of bushings are permitted on low pressure gas piping?
False
The volume of gas required for each appliance shall be determined from ?
The rating plate and manufacturers specifications
Finished piping and appliance connections shall be checked under ___________ pressure with either ________ solution or a _____________ device
Normal operating pressure with either a Soap solution or leak detection device
When a piping system is purged outdoors the purge point must not terminate closer than ___ft from a building or air intake
10ft
The maximum range of a test gauge shall exceed the test pressure by at least 15% but not greater than 300%
True / false
True
A 2” NPS welded gas line shall be tested to a pressure of 50psig or 1.5times max operating pressure for 180 minutes
True / false
True
A gas line operating at 10” W.C shall be designed to prevent the loss of no more than ____” W.C
One
A purge line shall be no larger than 1/2” diameter NPS for purging a line up to 4” NPS
T/F
True
