CHAPTER 10 — TRAPS AND INTERCEPTORS quizlet

waterseal trap

Each plumbing fixture, excepting those having integral traps, shall be separately trapped by an approved-type _____

three (3)

One trap may serve a set of not more than _____ single compartment sinks or laundry tubs of the same depth or three (3) lavatories immediately adjacent to each other and in the same room if the waste outlets are not more than 0.75 meter apart and the trap is centrally located when three (3) compartments are installed.

1 trap arm

1 trap is equal to

Integral Trap

Kind of trap for water closet

P-Trap

Kind of trap for lavatory, shower drain and floor drain

Drum Trap

Kind of trap for bath tub

food waste disposal unit

Each such _____ shall be connected to a separate trap.

0. 6 meter

The vertical distance between a fixture outlet and the trap weir shall be as short as practicable, but in no case shall the tailpiece from any fixture exceed _____ in length.

siphonage and back-pressure

Each plumbing fixture trap. except as otherwise provided in this Code shall be protected against _____ and ____ by a properly placed vent pipe.

in no case less than two times the diameter of the trap arm

Minimum distance from vent to trap.

ninety (90)

A trap arm may change direction without the use of a cleanout when such change of direction does not exceed _____ degrees.

76 mm

But for trap arms ____ in diameter and larger, the change of direction not exceeding 22%, no cleanout is required and for change of direction greater than 22% a cleanout is required at the bend

water closets

The vent pipe opening from a soil or waste pipe, except for _____ and similar fixtures, shall not be below the weir of the trap.

0.76 m

Distance of trap arm to vent: 32 mm dia. trap

1.07 m

Distance of trap arm to vent: 38 mm dia. trap

1.52 mm

Distance of trap arm to vent: 51 mm dia. trap

1.83 mm

Distance of trap arm to vent: 76 mm dia. trap

3.05 mm

Distance of trap arm to vent: 102 mm dia. trap

1.8 meters or 6 feet

The developed length between the trap of a water closet or similar fixture measured from the top of closet ring (closet flange) to inner edge of vent shall not exceed ______________.

Gauge 17 B & S (1.1 mm)

Gauge of exposed and readily accessible brass tubing trap.

trap arm

The trap size should be the same size as the (____________) to which it is connected.

self-cleaning

Each trap, except one for an interceptor or similar device shall be ____________.

brass

An exposed and readily accessible drawn ______________ tubing trap, not less than Gauge 17 B & S (1.1 mm) may be used on fixtures discharging domestic sewage but shall exclude urine.

drum trap

No ____ shall be installed without a vent.

True - but may be installed if permitted by AA for special condition

T or F: Drum trap is prohibited

1) S trap

2) Bell trap

3) Crown-vented trap

Prohibited traps (3)

102 mm

Each fixture trap shall have a water seal of not less than 51 mm and not more than _____ deep except where a deeper seal is found necessary.

erect and true

Traps shall be set ___________ with respect to their water seals.

backwater valve

When subject to reverse flow of sewage or liquid waste, such floor drains shall be equipped with an approved ___________ valve.

shut-off valve

When automatic trap priming devices are installed, they shall be accessible for maintenance and provided by an accessible ____________ valve.

Interceptors or clarifiers

_________________ shall be provided when, in the judgment of the Administrative Authority, they are necessary for the proper handling of liquid wastes containing grease, flammable wastes, sand, solids, acid or alkaline substances, or other ingredients harmful to the building drainage system, the public or private sewer and sewage disposal system.

152 mm

Interceptors or clarifiers for sand and similar heavy solids shall be so designed and located as to be readily accessible for cleaning and shall have a water seal of not less than _____ deep.

screening device

Every fish, fowl and animal slaughter house or establishments and every fish, fowl and meat packing or curing establishments shall drain or discharge through a __________ device and thence into a grease interceptor (clarifier) for proper disposal of effluents.

grease trap

A ______________ is not required for individual dwelling units or for any private living quarters.

3.4 liters

No individual grease trap shall be installed for a facility that has an approved rate of flow of more than _____ per second nor less than 1.3 L/s,

Flow control

__________________ devices shall be so designed that the flow through such device or devices shall at no time be greater than the rated capacity of the grease trap.

two and one-half

The total capacity of fixtures discharging into any such grease trap shall not exceed _____ times the certified liters per minute flow rate of the grease trap.

four (4)

No more than _____ separate fixture shall be connected to or discharged into one grease trap.

1.2 meters,

0.75 meters

An approved-type grease trap may be used as a fixture outlet and the grease trap for a single fixture when the horizontal distance between the fixture outlet and the grease trap does not exceed _______________ and the vertical tailpipe or drain does not exceed _______________ meters.

51 mm

Each grease trap shall have an approved water seal of not less than _____ in depth or the diameter of its outlet whichever is greater.

18 kg

Table 10-2

Grease retention capacity for 1 fixture connected with required flow rate of 76L/min

23 kg

Table 10-2

Grease retention capacity for 2 fixture connected with required flow rate of 95L/min

32 kg

Table 10-2

Grease retention capacity for 3 fixture connected with required flow rate of 132L/min

45 kg

Table 10-2

Grease retention capacity for 4 fixture connected with required flow rate of 189L/min

Number of meals per peak hour

Sizing of Grease Interceptors

NWRF = interceptor size

N stands for _____

Waste Flow Rate

Sizing of Grease Interceptors

NWRF = interceptor size

W stands for _____

Retention times

Sizing of Grease Interceptors

NWRF = interceptor size

R stands for _____

Storage Factor

Sizing of Grease Interceptors

NWRF = interceptor size

F stands for _____

6 gallon (22.7L)

Waste Flow rate with dishwashing machine

5 gallon ( 18.9L)

Waste Flow rate without dishwashing machine

2 gallon (7.6L)

Waste Flow rate for single service kitchen

1 gallon (3.8L)

Waste Flow rate with food waste disposer

2.5 hrs

Retention time for commercial kitchen waste dishwasher

1.5 hrs

Retention time for single service kitchen single serving

1

Storage Factors for Fully equipped commercial kitchen - 8hrs

2

Storage Factors for Fully equipped commercial kitchen - 16hrs

3

Storage Factors for Fully equipped commercial kitchen - 24hrs

1.5

Storage Factors for Single Service kitchen

wire basket

Laundry equipment that does not have integral strainers shall discharge into an interceptor having a _____

one

Multiple floor drains may discharge into __________ sand interceptor.

76 mm

The outlet pipe of sand interceptor shall be the same size as the inlet size of the oil interceptor, the minimum being ________ and the baffle shall have two (2) openings of the same diameter as the outlet pipe and at the same invert as the outlet pipe.

two (2)

The sand interceptor shall have an interior baffle for full separation of the interceptor into ___________ sections.

staggered

The openings of the sand interceptor shall be ______________ so that there cannot be a straight line flow between any inlet pipe and the outlet pipe.

0.2 sqm

The sand interceptor shall have a minimum dimension of ___________ for the net free opening of the inlet section.

610 mm

Minimum depth under the invert of the outlet pipe of a sand interceptor.

0.09 sqm

For each 18.9 L per minute flow or fraction thereof over 75.7 L per minute the area of the sand interceptor inlet section is to be increased by _____.

fifty (50) percent

The outlet section of sand interceptor shall at all times have a minimum area of _____ of the inlet section.