Traps, Interceptors & Separators Flashcards
Understand the function and installation of traps and interceptors. (30 cards)
True or False:
Storm water shall be drained into sewers intended for sanitary drainage.
False
Fill in the blank:
Subsoil drainpipe shall be surrounded by not less than ______ inches of gravel, slag or crushed rock.
4
Fill in the blank:
The minimum discharge pipe size for a subsoil drain sump is ______ inches.
1 1⁄2
Fill in the blank:
A subsoil drain sump discharge pipe is permitted to discharge onto a concrete splash block with a minimum length of ______ inches.
24
What is the maximum length of a trap arm if the trap is 1 1/4”?
30”
What is the maximum length of a trap arm if the trap is 2”?
60”
Fill in the blank:
A trap arm smaller than 3” is permitted to change direction without the use of a cleanout where the change of direction does not exceed ______ degrees.
90
True or False:
Each trap shall be self-cleaning.
True
True or False:
The installation of a bell trap is prohibited.
True
Fill in the blank:
Each fixture trap shall have a liquid seal of not less than ______ inches.
2
Which of the following statements is not true about floor drain traps?
a. It shall connect so that it can be readily cleaned.
b. It shall be sufficiently sized.
c. It shall be permitted to be concealed.
d. The drain inlet shall be located in full view.
c. It shall be permitted to be concealed.
True or False:
Floor drain traps subject to infrequent use shall be protected with a trap seal primer.
True
True or False:
Unless required by an Authority Having Jurisdiction, building traps shall not be installed.
True
Fill in the blank:
Interceptors for sand shall have a water seal of not less than ______ inches.
6
Fill in the blank:
Interceptors shall be ______ so that they do not become air bound when closed covers are used.
Properly vented
True or False:
The use of a ladder to access an interceptor shall be considered readily accessible.
False
Fill in the blank:
Commercial laundry equipment shall drain through a wire basket that will prevent the passage of solid that are ______ inch or larger into the drainage system.
1/2
True or False:
Dishwashers shall not be connected to a grease interceptor.
True
Which of the following is not an example of a fixture that should discharge through a gravity grease interceptor?
a. scullery sink
b. pot and pan sink
c. soup kettle
d. hand wash sink
d. hand wash sink
True or False:
Gravity grease interceptors should be located as close as practical to the fixtures they serve.
True
Gravity grease interceptors shall be designed to retain grease until accumulations can be removed by pumping.
True
What is the volume in gallons required for a gravity
grease interceptor that is serving 90 DFU?
1250
What is the minimum inlet and outlet pipe size for a sand interceptor?
3”
What is the minimum pipe size for a flammable vapor vent on an oil and flammable liquid interceptor?
2”
