CH 10 - TRAPS AND INTERCEPTORS

waterseal trap; trap arm

Each plumbing fixture, excepting those having integral traps, shall be separately trapped by an approved-type ______. Not more than one trap shall be permitted on a _______.

3; 3; 0.75 meter; 3

It is provided, however, that one trap may serve a set of not more than __ single compartment sinks or laundry tubs of the same depth or __ lavatories immediately adjacent to each other and in the same room if the waste outlets are not more than ____ apart and the trap is centrally located when ___ compartments are installed.

food waste disposal unit; separate trap

No______ shall be installed on any set of restaurant commercial or industrial sinks served by a single trap, each such food Waste disposal unit shall be connected to a _____.

separate; independent;

Each domestic clotheswasher and each laundry tub shall be connected to a ______ and ________ trap; except that a trap serving a laundry tub may also receive the waste from a clotheswasher set adjacent thereto.

kitchen sink

No clotheswasher or laundry tub shall be connected to any trap of a ________.

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.

vent pipe

Each plumbing fixture trap, except as otherwise provided in this Code, shall be protected against siphonage and back-pressure by a properly placed ______.

vent pipe system

Air circulation shall be assured throughout all parts of the drainage system by means of a _______ installed in accordance with the requirements of this Code.

protecting vent

Each fixture trap shall have a _____ so located that the developed length of the trap arm from the trap weir to the inner edge of the vent shall be within the distance given in Table 10-1, but in no case less than 2 times the diameter of the trap arm.

90 degrees

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

22 1/2°

For trap arms 76 mm in diameter and larger, the change of direction not exceeding ______ no cleanout is required

cleanout; bend

for change of direction greater than 22 1/2° a ______ is required at the ________

weir

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

1.8 meters

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 ______.

self-cleaning

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

ABS; cast brass; cast iron; lead; PV

Traps for bathtubs, showers, lavatories, sinks, laundry tubs, floor drains, urinals, drinking fountains, dental units and similar fixtures shall be of standard designs and weights and shall be of ____, ____, _____, _____, ___, or other approved materials.

Gauge 17 B&S (1.1 mm)

An exposed and readily accessible drawn brass tubing trap, not less than ________, may be used on fixtures discharging domestic sewage but shall exclude urine.

interior waterway

Every trap shall have a smooth and uniform ______.

outlet side; tubing trap adapter

No more than 1 approved slip joint fitting may be used on the _____ of a trap, and no tubing trap shall be installed without a listed ______

Table 7-2; trap

The nominal size of a trap for a given fixture shall be sufficient to drain the fixture rapidly, but in no case, less than that given in _____. The ____ shall be the same size as the trap arm to which it is connected.

seal

No form of trap which depends for its ____upon the action of movable parts or concealed interior partitions shall be used.

S; Bell; Crown-vented

____, ____, ____, traps are prohibited

double

No i1x.ture shall be _____ trapped.

Drum traps

______ may be installed only when permitted by the Administrative Authority for special condition.

vent

No drum trap shall be installed without a ____

51 mm; 102 mm

Each fixture trap shall have a water seal of not less than ____ and more than ____ deep except where a deeper seal is found necessary by the Administrative Authority for special conditions.

erect; true

Traps shall be set ____ and ____ with respect to their water seals.

drain inlet

The ______ shall be so located that it is all times in full view.

backwater valve

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

Floor drain; water seals

_____ or similar traps directly connected to the drainage system and subject to infrequent use shall be provided with an approved automatic means of maintaining their _______, except where not deemed necessary for safety or sanitation purposes by the Administrative Authority.

shut-off valve

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

interceptors or clarifiers

_________ (including grease, oil and sand interceptors, etc.) shall be provided when, in the judgement 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.

interceptor or clarifier

Except where otherwise specifically permitted, no wastes other than those requiring treatment or separation shall be discharged into any ___________

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.

air bound

interceptors or clarifiers shall be so designed that they will not become ______ if closed covers are used. . Each interceptor (clarifier) shall be properly vented.

ladders

The use of _____ or the removal of hulky equipment in order to service interceptors or clarifiers shall constitute a violation of accessibility.

interceptor (clarifier}

Every private or public washrack and/or floor or slab used for cleaning machinery or machine parts shall be adequately protected against storm or surface water and shall drain or discharge into an _________ of an approved design for this use to separate the oil and grease before the effluent reach the public stream.

grease trap

When, in the judgment of the Administrative Authority, Waste pretreatment is required, an approved-type _______ complying with the provisions of this sections shall be installed in the wasteline leading from sinks, drains and other fixtures or equipment in establishments such as restaurants, cafes, lunch counters. cafeterias, bars and clubs, hotel hospital, sanitarium, factory or school kitchens, or other establishment~ where grease may be introduced into the drainage or sewer system in quantities that can effect line stoppage or hinder sewage treatment or private sewage disposal.

A ______ is not required for individua! dwelling units or for any private living quarters.

3.4 L/s; 1.3 L/s

No individual grease trap shall be installed for a facility that has an approved rate of flow of more than ______ nor less than _____, except when specially approved by the Administrative Authority.

flow control; tailpiece

Each plumbing fixture or piece of equipment connected to a grease trap shall be provided with an approved type _____ or restricting device installed in a readily accessible and visible location in the ______ or drain outlet of each such fixture.

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.

adjustable; removable

No flow control device having _____ or ______ parts shall be approved.

Table 10-2

Each grease trap required by this Section shall have an approved rate of flow which is not less than that given in _____ for the total number of connected fixtures.

2 1/2

The total capacity of fixtures discharging into any such grease trap shall not exceed _____ times the certified liters per minute flowrate of the grease trap as per Table 10-2.

1.2 meters; 50%; four (4)

Any grease trap installed with inlet more than _____ lower in elevation than the outlet of any fixture discharging into such grease trap shall have an approved rate of flow which is not less than _______ greater than that given in Table 10-2 nor more than ____ separate fixture shall be connected to or discharged into any one grease trap.

Fixture

shall mean and include each plumbing fixture, appliance, apparatus or other equipment required to be connected lo or discharged into a grease trap by any provision of this Section.

individually trapped; vented

Each fixture discharging into a grease trap shall be ______ and ____ in an approved manner

fixture outlet; 1.2 meters; 0.75 meters

An approved-type grease trap may be used as a _____ 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 _______.

water jacketed; grease interceptor

No _____ grease trap or _____ shall be approved or installed

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.

food waste disposal unit

Unless specifically required or permitted by the Administrative Authority, no _________ shall be connected to or discharged into any grease interceptor or grease trap.

below

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

6 feet (1829 mm)

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

interceptor; 12.7 mm

Laundry equipment that does not have integral strainers shall discharge into an _____ having a wire basket or similar device, that is removable for cleaning and that will prevent passage into the drainage system of solids ____ or larger in maximum dimension, such as string, rags, buttons, or other solid materials detrimental to the public sewerage system.

sand interceptor

Whenever the discharge of a fixture or drain may contain solids or semi-solids heavier than water that would be harmful to a drainage system or cause a stoppage within the system, the discharge shall be through a ______.

one

Multiple floor drains may discharge into ____ sand interceptor.

Sand interceptors

______ shall be built of brick or concrete, prefabricated coated steel or other watertight material.

interior baffle

The interceptor shall have an ____ for full separation of the interceptor into 2 sections.

76 mm; 2 openings

The outlet pipe shall be the same size as the inlet size of the oil interceptor, the minimum being ____ and the baffle shall have _____ of the same diameter as the outlet pipe and at the same inverts the outlet pipe.

staggered

These openings shall be _____ so that there cannot be a straight line flow between any inlet pipe and the outlet pipe.

lower

The invert of the inlet pipe shall be no ____ than the invert of the outlet pipe.

0.2 m^2; 610 mm

The sand interceptor shall have a minimum dimension of ____ for the net free opening of the inlet section and a minimum depth under the invert of the outlet pipe of _____.

18.9 L/m; 75.7 L/m; 0.09 m² ; 50%

For each ____ flow or fraction thereof over _____ the area of the sand interceptor inlet section is to be increased by ____. The outlet section shall at all times have a minimum area of ____ of the inlet section.

outlet section; inlet section

The _____ shall be covered by a solid removable cover set flush with the finished floor, and the _____ shall have an open grating set flush with the finished floor and suitable for the traffic in the area in which it is located.