4. Support and fasteners.

Question 0

2. Under what conditions would steel extension pipe support , or clamp, be used to support a soil stack at required floor levels?

Answer 0

This type of pipe support, which is clamped tightly to the pipe, would be used when the soil stack is connected of galvanized steel or wrought iron.It might be used as a pie rest, supporting the hub, on cast-iron soil pipe if it is not fastened too tightly to the pipe.

Question 1

1. Hanger rod sizes?
3/8" - 
1/2" - 
5/8" - 
3/4" - 
7/8" - 
1" - 
1-1/8' - 
1-1/4" - 
1-1/2" - 
1-7/8" -

Answer 1

3/8" - 3/4" to 2" Pipe inclusive.
1/2" - 2-1/2" to 3-1/2" Pipe inclusive.
5/8" - 4 and 5 inch Pipe. 
3/4" - 6" pipe.
7/8" - 8 to 12 inch Pipe inclusive.
1" - 14" and 16" O.D. Pipe.
1-1/8' - 18" O.D. Pipe.
1-1/4" - 20" O.D. Pipe.
1-1/2" - 24" O.D. Pipe.
1-7/8" - 30" O.D. Pipe.

Question 2

3. When installing a plumbing system in a residence or building in which frame construction is used, many journeymen lay out and cut all possible holes before installing any pipe. Why is this considered good installation procedure?

Answer 2

This procedure shows good organization on the part of the mechanic. Any unusual conditions or special problems are immediately discovered and can be acted upon, to eliminate unnecessary delay at a later time. Orders for all mateials needed can usually be completed at this time. When using this procedure, the journeyman has his job clearly pictured in his mind, and the installation usually progressed in an efficient manner.

Question 3

4. Where shall rigid support sway bracing be provided?

Answer 3

At changes in direction greater than 45 degrees for pipe sizes 4 inches and larer.

Question 4

5. Where shall restrains be provided for drain pipe?

Answer 4

For pipe sizes greater than 4 inches at all changes in direction and at all changes in diameter greater than two pipe sizes. Braces, blocks, rodding and other suitable methods as specified by coupling manufacturer shall be utilized.

Question 5

6. Gas pipping support intervals for steel pipe.
1/2" - 
3/4" or 1" - 
1-1/4" or larger ( horizontal) - 
1-1/4" or larger ( vertical) -

Answer 5

1/2” - 6 feet.
3/4” or 1” - 8 feet.
1-1/4” or larger ( horizontal) - 10 feet.
1-1/4” or larger ( vertical) - Every floor level.

Question 6

7. Hanger spacing.
   Piping material - Maximum horizontal spacing (feet) - Maximum vertical spacing (feet)
   ABS pipe -
   Brass pipe -
   Cast-iron pipe -
   Copper or copper alloy pipe -
   Copper or copper-alloy tubing, 1-1/4-inch diameter and smaller -
   Copper or copper-alloy tubing, 1-1/2-inch diameter and larger -
   Steel pipe -
   PVC pipe -
   Stainless steel drainage systems -

Answer 6

ABS pipe - 4 - 10 b.
Brass pipe - 10 - 10.
Cast-iron pipe - 5a - at base and at each story height no greater than 20.
Copper or copper alloy pipe - 12 - at each story height no greater than 12.
Copper or copper-alloy tubing, 1-1/4-inch diameter and smaller - 6 - at each story height no greater than 10.
Copper or copper-alloy tubing, 1-1/2-inch diameter and larger - 10 - at each story height no greater than 10.
Steel pipe - 12 - At every story hight.
PVC pipe - 4 - 10 b.
Stainless steel drainage systems -10 - 10 b.
a - the maximum horizontal spacing of cast iron-iron pipe hangers shall be increased to the 10 feet where 10-foot lengths of pipe are installed.
b - mid-story guide for sizes 2 inches and smaller.