Sanitary Drainage

Question 1

Minimum thickness of lead on lead bends and traps?

Answer 1

1/8 inch

Question 2

Minimum slope on 2-1/2 inch or less horizontal drainage pipe?

Answer 2

1/4 inch

Question 3

Minimum slope on 3 to 6 inch horizontal drainage pipe?

Answer 3

1/8 inch

Question 4

Minimum slope of 8 inch or larger horizontal drainage pipe?

Answer 4

1/16 inch

Question 5

Horizontal branches shall connect to the bases of stacks at a point located not less than ______ times the diameter of the drainage stack downstream from the stack.

Answer 5

10

Question 6

Lead wiped joints shall be fully wiped, with an exposed surface on each side of the joint not less than _______ inch.

Answer 6

3/4 inch

Question 7

Lead wiped joints shall be not less than _____ inch thick at the thickest point.

Answer 7

3/8 inch

Question 8

DFU value for bathroom group (1.6 gpf water closet)?

Answer 8

5 dfu

Question 9

DFU value for bathroom group (greater than 1.6 gpf water closet)?

Answer 9

6 dfu

Question 10

One clean-out is required for every _________________.

Answer 10

Four horizontal 45s