Chapter 7 (7.1.1 - 7.3.5.2)

Question 1

(7.1.2.1)Cover Requirements. Underground piping systems shall be installed with a minimum of how much cover?

Answer 1

a minimum of 12 inches of cover.

Question 2

(7.1.2.1)Cover Requirements. The minimum cover of underground piping systems shall be increased to what, if external damage to the pipe or tubing from external forces are likely to result?

Answer 2

Shall be increased to 18 inches.

Question 3

(7.1.2.1)Cover Requirements. Where a minimum of 12 inches of cover cannot be provided, what shall we do to install the piping?

Answer 3

The piping shall be installed in conduit or bridged.

Question 4

(7.1.2)Protection Against Damage. Means shall be provided to prevent excessive stressing of the piping for what conditions?

Answer 4

Where vehicular traffic is heavy or soil conditions are unstable and settling of piping or foundation walls could occur.

Question 5

(7.1.2)Protection Against Damage. Piping shall be protected from physical damage where it passes through what?

Answer 5

flower beds, shrub beds, and other such cultivated areas where such damage is reasonably expected.

Question 6

(7.1.2.2) Trenches. The trench shall be graded so that the pipe has what?

Answer 6

A firm, substantially continuous bearing on the bottom of the trench.

Question 7

(7.1.2.3) Backfilling. Where flooding of the trench is done to consolidate the backfill, care shall be exercised to see what?

Answer 7

That the pipe is not floated from its firm bearing on the bottom of the trench.

Question 8

(7.1.3) Protection Against Corrosion. Gas piping in contact with earth or other material that could corrode the piping shall be protected against corrosion in an approved manner. When dissimilar metals are joined underground, what shall be used? and what shall the pipe not be laid in contact with?

Answer 8

An insulating fitting or coupling shall be used and the pipe shall not be laid in contact with cinders

Question 9

(7.1.4) Protection Against Freezing. Where formation of hydrates or ice is known to occur, piping shall be what?

Answer 9

Protected against freezing.

Question 10

(7.1.5) Piping Through Foundation Wall. (a) Underground piping, where installed through the outer foundation or basement wall of a building, shall be what? (b) The space between the gas piping and the sleeve and between the sleeve and the wall shall be what?

Answer 10

(a)Encased in a protective sleeve or protected by an approved device or method.
(B) Sealed to prevent the entry of gas or water.

Question 11

(7.1.6) Piping Underground Beneath Buildings. Where gas piping is installed underground beneath buildings, the piping shall be what?

Answer 11

Encased in an approved conduit designed to withstand the imposed loads and installed in accordance with 7.1.6.1 or 7.1.6.2

Question 12

(7.1.6.1) Conduit with one end terminating outdoors.
the conduit shall extend to an accessible portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. Where the end sealing is of a type that retains the full pressure of the pipe, the conduit shall be designed for the same pressure as the pipe. The conduit shall extend at least _____(A)______, be ____(B)____, and installed to prevent entrance of ___(C)___.

Answer 12

(A) 4 inches outside the building
(B) Vented outdoors above ground level
(C) water and insects

Question 13

(7.1.6.2) Conduit with Both ends terminating indoors. Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an ___(A)___ portion of the building and ___(B)___.

Answer 13

(A) accessible
(B) shall not be sealed

Question 14

(7.1.7.1) Connection of Plastic Piping. Plastic piping shall be installed ___(A)___.
Exception 1: Plastic piping shall be permitted to terminate aboveground where ___(B)___.
Exception 2: Plastic piping shall be permitted to terminate with a ___(C)___ including basements, where plastic piping is inserted in a piping material permitted for use in buildings.

Answer 14

(A) outdoors, underground only
(B) an anodeless riser is used
(C) wall head adapter aboveground in buildings

Question 15

(7.1.7.3) Tracer Wire. An electrically continuous corrosion resistant tracer wire with a minimum of ___(A)___ or tape shall be buried with the plastic pipe to facilitate locating. One end of the tracer wire or tape shall be ___(B)___ at a building wall or riser.

Answer 15

(A) AWG 14 (14 gauge)
(B) brought aboveground

Question 16

(7.2.3) Gas Piping to be Sloped. Piping for other than dry gas conditions shall be ______.

Answer 16

sloped not less than 1/4 inch in 15 feet to prevent traps

Question 17

(7.2.4) Prohibited Locations. Gas piping in any building shall not be installed in or through ________ other than combustion air ducts.

Answer 17

a clothes chute, chimney or gas vent, dumbwaiters, elevator shaft, or air ducts

Question 18

(7.2.5.1) Piping shall be supported with ___________, or building structural components, suitable for the size of the piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration

Answer 18

metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers

Question 19

(7.3.2) Concealed piping in buildings. What type of fittings can be used in concealed piping in buildings?

Answer 19

Threaded elbows, tees and couplings, brazed fittings, welded fittings, and fittings listed to ANSI LC 1/ CSA 6.26 or ANSI LC4.

Question 20

(7.3.3) Piping in partitions. Can gas pipe be located in solid partions?

Answer 20

Gas pipe shall not be located in solid partitions.

Question 21

(7.3.4) Tubing in partitions. (1) A steel striker barrier not less than ___(A)___ thick or equivalent, is installed between the tubing and the finished wall and extends at least ___(B)___ of plates, firestops, wall studs, and so on.
(2) The tubing is installed in single runs and in not ___(C)___

Answer 21

(A) 0.0508
(B) 4 inches beyond concealed penetrations
(C) rigidly secured