RNPCP - Chapter 10: Traps and Interceptors

one trap per trap arm

Section 1001 - Traps Required

Not more than _____ trap shall be permitted on a trap arm.

Three (3) single compartment sinks or laundry tubs

Section 1001 - Traps Required

One trap may serve a set of not more than __________ single compartment sinks or laundry tubs of the same depth

Three (3) lavatories

1. immediately adjacent

2. same room

3. 750 mm - max. distance between waste outlets

4. centrally located

Section 1001 - Traps Required

One trap may serve a set of not more __________ lavatories

immediately adjacent to each other and in the same

room if the waste outlets are not more than 750 mm apart and the trap is centrally located when three (3) compartments are installed.

separate trap

Section 1001 - Traps Required

Food waste disposal units shall not be served by a single trap and be connected to a _________

Food waste disposal - separate trap

Clothes washer &laundry tubs - separate and independent trap

Section 1001 - Traps Required

Food waste disposal units shall not be served by a single trap and be connected to a _________

Each domestic clothes washer and each laundry tub shall be connected to a _____________.

clotheswasher

No clothes washer or laundry tub shall be connected to any trap of a kitchen sink.

Section 1001 - Traps Required

A trap serving a laundry tub may aJso receive the waste from a __________ set adjacent thereto.

600 mm - max tailpiece length

**Shall be as short as practicable

Section 1001 - Traps Required

In no case shall the tailpiece from any fixture exceed ______ in length.

2 times the diameter of the trap arm

Section 1002 - Traps Protected by Vent Pipes

Fixture traps shall in no case be less than _____

ninety (90) degrees

Section 1002 - Traps Protected by Vent Pipes

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

76 mm

22.5° or less - no cleanout is required

greater than 22.5° - cleanout is required at the bend

Section 1002 - Traps Protected by Vent Pipes

For trap arms _______ or more in diameter, the change in direction

22.5° or less - no cleanout is required

greater than 22.5° - cleanout is required at the bend

weir of the trap

Section 1002 - Traps Protected by Vent Pipes

The vent pipe opening from a soil or waste pipe (except for water closets and similar fixtures) shall not be below the

1.8 meters - max. developed length from closet ring to vent

Section 1002 - Traps Protected by Vent Pipes

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

Gauge 17 B&S (1.1 mm) - brass traps for fixtures discharging domestic sewage

Section 1003 - Traps Described

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

tubing trap adapter

Section 1003 - Traps Described

No more than one slip joint fitting may be used on the outlet side of a trap. No tubing trap shall be installed without a listed __________

vent

Section 1004 - Traps Prohibited

"S", Bell, Crown-vented traps are prohibited.

No fixture shall be double trapped

Drum traps may be installed only when permitted by AA for special condition. Drum traps shall be installed with a ______

51 mm to 102 mm - depth of trap seal

2 to 4 inches

Section 1005 - Trap Seals

Each fixture trap shall have a water seal of not less than _____ and more than __________ except where a deeper seal is found necessary by AA

automatic means of maintaining their water seals

When automatic trap priming devices are installed, they shall

be accessible for maintenance and provided by an accessible shut-off

valve.

Section 1007 - Trap Seal Protection

Floor drain or similar traps directly connected to the drainage system and subject to infrequent use shall be provided with an approved _______________

Interceptors or clarifiers (including fuel, oil, and sand interceptors, etc.)

Section 1008 - Industrial Interceptors (Clarifiers & Separators)

____________ shall be provided when 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 - min. water seal for inteceptors and clarifiers for sand and heavy solids

6 inches

Section 1008 - Industrial Interceptors (Clarifiers & Separators)

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

individual dwelling units or for any private living quarters

Section 1011 - Grease Traps

A grease trap is not required for ___________

1.3 to 3.4 lps - allowed range of rate of flow for grease traps

(78 to 204 lpm)

Section 1011 - Grease Traps

NO individual grease trap shall be installed for a facility that has an approved rate of flow of MORE THAN _________ nor LESS THAN ___________

flow control or restricting device

**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.

Section 1011 - Grease Traps

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

fixture capacity = max. 2.5 times the required flow rate of grease traps

Section 1011 - Grease Traps

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

If: grease trap inlet is 1.2 meters lower than the fixture outlet

50% greater flow rate

Section 1011 - Grease Traps

Any grease trap installed with the inlet more than 1.2 meters lower in elevation than the outlet of any fixture discharging into such grease trap shall have an approved rate of flow that is not less than ___________

four (4) separate fixtures

Section 1011 - Grease Traps

Not more than ______ separate fixture shall be connected to or discharged into any one grease trap.

individually

Section 1011 - Grease Traps

Each fixture discharging into a grease trap shall be ______________ trapped and vented

max distance from outlet = 1200 mm

max length of tailpiece/drain = 750 mm

when used as fixture outlet or for a single fixture

Section 1011 - Grease Traps

A grease trap may be:

1. Used as a fixture outlet

2. Used for a single fixture

When

1. The horizontal distance between the outlet and the trap does not exceed ____________

2. The vertical tailpiece or drain does not exceed _________

water jacketed

Section 1011 - Grease Traps

No ___________ grease trap or grease interceptor shall be approved or installed

51 mm - min. trap seal of grease trap

Or diameter of outlet, whichever is greater

Section 1011 - Grease Traps

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

solids 12.7 mm or larger

Section 1015 - Laundries

Laundry equipment that does not have integral strainers shall discharge into an interceptor 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.

water

Section 1016 - Sand Interceptors Where Required

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

Multiple floor drains may discharge into one sand interceptor.

two (2) sections

Section 1017 - Construction and Size

Sand interceptors shall have an interior baffle for full separation of the interceptor into _________ sections.

76 mm - minimum size of outlet/inlet pipe

(3 inches)

Section 1017 - Construction and Size

Sand interceptors - the outlet pipe shall be the size same as the inlet size of the oil interceptor, the minimum being ______ and baffle have 2 openings of the same diameter as the outlet pipe and at the same invert as the outlet pipe.

0.2 sqm = minimum area of inlet section opening

Section 1017 - Construction and Size

The sand interceptor shall have a minimum dimension (area) of _____ for the net free opening of the inlet section

610 mm = minimum distance under the invert of the outlet pipe

Section 1017 - Construction and Size

The sand interceptor shall have a minimum depth under the invert of the outlet pipe of ___________

area of sand interceptor inlet section = 0.09 sqm

0.2 minimum + 0.09 sqm per 18.9 lpm of flow over 75.7 lpm

Section 1017 - Construction and Size

For each 18.9 lpm flow or fraction thereof over 75.7 lpm, the area of the sand interceptor inlet section is to be increased by 0.09 sqm.

outlet section = 50% of inlet section

(sand interceptor)

Section 1017 - Construction and Size

Sand Interceptor - The outlet section shall at all times have a minimum area of ____ of the inlet section