102I Intro to Gasfitting Codes & Regulations: Part B Flashcards
All pipe used in a gas installation should be what colour?
Black
Schedule 40 pipe may be used for pressure up to
125 psig
Which pipe can be buried underground w/o any coating
Type K, buried min. 18”
All gas hoses & hose fittings shall have a minimum pressure rating of
350 psig
The maximum allowable pressure drop on a low-pressure gas line system is
1” WC
The maximum allowable pressure drop on a high-pressure system is
50% of standing pressure
Drill holes must be located a minimum of
2 inches from any edge of a member
What must be applied to the male threads only, so that excess dope is forced out of the pipe instead of pushed into the pipe
Pipe dope
What tape is used for plumbing and is not approved for gasfitting?
white Teflon
Teflon tape must be applied how?
- wrapping it clockwise
- stretching it with a 50% overlap
- leaving the first 2 starter threads bare
Malleable iron bushings must reduce at least
2 or more pipe sizes
What is located in the gas pipe at the bottom of the final drop to an appliance?
Dirt pocket
Gaskets used in gas systems may not be natural rubber?
T or F
True as the gas tends to dissolve and break down the gasket
The minimum depth of the pocket is
3 inches
The fittings required to make up a dirt or drip pocket are:
a tee
a cap
a nipple
Unions and swing joints loosen over time?
T or F
True
The Electrical Code prohibits the use of gas pipe as a conductor?
T or F
True
Close nipples are not allowed to use
T or F
True
All underground piping or tubing must have sufficient cover to prevent damage to the gas line. In some cases, the depth will have to be increased,
but it shall never be less than 15”
Gas lines installed under a commercial driveway will require 24”
Piping shall not pass under a foundation wall or footing
T or F
True
All plastic gas lines must have a tracer wire?
T or F
True or equivalent attached to it prior to placing it in the trench
The gas line shall be protected from the corrosive effects of the concrete
by sleeving or double wrapping
All valves must be readily accessible and serviceable
T or F
True
The hose must not be subjected to temperatures in excess of
125F
The maximum range of the gauge shall exceed the test pressure by
at least 15%, but not more than 300%
The finish piping will be tested under normal working pressure conditions with a soapy water solution and a 10-minute meter test dial test
T or F
True
Minimum test for rough in piping is
15 psig for 15 minutes
The minimum size test gauge is
3”
