RNPCP - Chapter 8: Indirect Waste Piping, Wet-vented Systems, and Special Wastes

airbreak

Section 801 - Indirect Waste Conditions

All wastes drained by evaporative cooler, air washer, or similar air-conditioning equipment shall discharge through an __________ into an open floor sink or other receptors properly connected to the drainage system

airgap

(except walk-in refrigerators or combination walk-in and reach-in refrigerators used for storage and sales of products packaged in bottles, cartons, or containers)

*cooling and AC equipment may be separated by an air break but

*all food equipment with a full airgap

Section 801 - Indirect Waste Conditions

All wastes drained by

1. cold storage room, refrigerator, cooling counter, compartment, receptacle, appurtenance or device used for the storage or holding of food/drink

2. Dishwashing or culinary sink in any food preparation room used for soaking, washing, or preparing ready-to-serve food

shall discharge through an __________ into an open floor sink or other receptors properly connected to the drainage system

25mm - minimum airgap

Section 801 - Indirect Waste Conditions

The airgap for drainage shall not be less than _______ between the plumbing fixture outlet and the rim of the floor sink/receptor

excreta-connected vent

Section 803 - Indirect Waste Piping

No vent from indirect waste piping shall combine with any __________, but shall extend separately to the outside air.

directly trapped - indirect waste pipes 1.5m to 4.6m

Section 803 - Indirect Waste Piping

Indirect waste pipes exceeding 1.5 m but less than 4.6 m shall be ______________, but need not be vented

13 mm - minimum diameter of indirect waste pipes less than 4.6m in length

Section 803 - Indirect Waste Piping

Indirect waste pipes less than 4.6 m in length need not be larger in diameter than the drain outlet or tailpiece of the fixture, appliance, or equipment served, but in no case less than _______ in diameter.

0.45 - 0.8 meter - height of standpipe receptor above trap (clotheswasher)

Section 804 - Indirect Waste Receptors

No standpipe receptor for any clothes washer shall extend more than _____ nor less than ______ m above its trap.

0.15 to 0.45 meter - height of standpipe receptor trap (clotheswasher)

Section 804 - Indirect Waste Receptors

No trap for any clothes washer standpipe receptor shall be installed below the floor, but shall be roughed no less than _____ and not more than _____ above the floor

beehive strainer.

Section 804 - Indirect Waste Receptors

Every indirect waste interceptor receives discharge containing particles that clog the receptor shall have a readily removable _____________

airgap

Section 806 - Sterile Equipment

Appliances, devices or apparatus such as stills, sterilizers, and similar equipment requiring water and waste and used for sterile material shall be drained through an ____________h

- cast iron

- galvanized iron

- plastic

- other approved materials approved for this use

- brass (when condensate is discharged to an exposed fixture tailpiece and trap)

Section 807 - Appliances

When undiluted condensate water from a fuel-burning condensing appliance is discharged into the drainage system, the material in the drainage system shall be ____________

dishwasher airgap fitting

Listed airgaps shall be installed with the flood level (FL) marking at or above the flood level of the sink or drainboard, whichever is higher.

Section 807 - Appliances

No domestic dishwashing machine shall be directly connected to a drainage system of food waste disposer without the use of an approved _____________ on the discharge side of the dishwashing machine.

60 degree Celsius

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

No steam pipe shall be directly connected to any part of a plumbing or drainage system nor shall any water having a temperature above _______ be discharged under pressure

indirect waste piping

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

Pipes from boilers shall discharge by means of ___________

152 mm = deep seal trap extension from bottom of tank (to prevent steam escape)

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

All condensers and sumps shall be properly trapped at the outlet with a deep seal trap extending to within __________ of the bottom of the tank.

19 mm diameter = size of deep seal trap opening

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

All condensers and sumps shall be properly trapped at the outlet with a deep seal trap. The top of the deep seal trap shall have a _____ diameter opening located at the highest point of the trap to serve as a siphon breaker.

50% of capacity of condenser/sump = maintained through outlet positioning

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

Outlets shall be taken off from the side in a manner that allows a water line to be maintained, permanently occupying not less than ____________ of the capacity of the condenser or sump.

102 mm = min. wall thickness of concrete condenser/sump

(4 inches)

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

Sumps, condensers, or intercepting tanks constructed of concrete shall have walls and bottoms not less than ______ thickness, and the inside shall be cement plastered with a minimum thickness of 13 mm.

No. 12 U.S. Standard gauge = min. thickness of metal condensers

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

Condensers constructed of metal shall be not less than _____________ (2.77 mm thickness), and all such metal condensers shall be protected from external corrosion by an approved bituminous coating.

twice the volume of water removed from boilers when the water level is reduced by 150 mm

(min. volume of condenser/sump)

Section 810 - Steam and Hot Water Drainage Condensers and Sumps

Sumps and condensers shall contain a volume of not less than ___________ the volume of water removed from the boiler or boilers connected thereto when the normal water level of such boiler or boilers is reduced by not less than 102 mm.

pretreated

Detailed plans and specifications of pretreatment facilities shall be required by the AA

Section 811 - Chemical Wastes

Chemical or industrial liquid wastes likely to damage or increase maintenance costs on the excreta sewer system, detrimentally affect sewage treatment, or contaminate surface or subsurface waters shall be ___________ to render them innocuous prior to their discharge into a drainage system.

chemical wastes

Section 811 - Chemical Wastes

No _____________ shall be discharged into the ground, local sewer or other disposal means without approval of the local AA.

- small photographic or x-ray dark rooms

- small research or control laboratories

Section 811 - Chemical Wastes

The provisions of this Section relative to materials and methods of construction need not apply to minor installations such as ____________ or ____________ where small amounts of adequately water-diluted chemicals are discharged.

1 and 2 DFU = max. FU for wet-vented fixtures

Section 812 - Vertical Wet Venting

Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of ________ and __________ fixture units.

four (4) fixtures = max. number of wet-vented fixture

Section 812 - Vertical Wet Venting

Fixtures that also serve as a vent shall not exceed _________.

All wet-vented fixtures shall be on the same floor level, provided further that fixtures with a continuous vent discharge into a wet vent shall be on the same level as the wet-vented fixtures.

one (1) pipe size larger than upper fixture or total FU served by the wet vent, whichever is larger

51 mm = absolute minimum size of wet vents

Section 812 - Vertical Wet Venting

The vertical piping between any two (2) consecutive inlet levels shall be considered a wet-vented section. Each wet-vented section shall be a minimum of:

1. ___________ larger than the required minimum waste pipe size of the upper fixture, or

2. ___________larger than the required minimum pipe size for the sum of the fixture units served by such wet-vented section,

whichever is larger, but in no case less than _________ in diameter.

sum of the fixture units served

Section 812 - Vertical Wet Venting

Common vent sizing shall be the ____________, but in no case smaller than the minimum vent pipe size required for any fixture served.

drainboard height

Section 813 - Special Venting for Island Fixtures

Traps for island sinks and similar equipment shall be roughed-in above the floor and may be vented by extending the vent as high as possible, but not less than the __________, and then returning it downward and connecting it to the horizontal sink drain immediately downstream from the vertical fixture drain.

foot vent

Section 813 - Special Venting for Island Fixtures

The returned vent shall be connected to the horizontal drain through a wye-branch fitting and shall, in addition, be provided with a _____________ taken off the vertical fixture vent by means of a wye-branch fitting immediately below the floor. The vent line shall then extend to the nearest partition and through the roof to the open air or may be connected to other vents at a point not less than 152 mm above the flood level rim of the fixtures served.

2% slope

Section 813 - Special Venting for Island Fixtures

Drainage fittings shall be used on all parts of the vent below the floor level, and such a vent line shall have a minimum slope of ________ back toward the drain where it is connected.

return bend

Section 813 - Special Venting for Island Fixtures

The ___________ used under the drainboard shall be a one (1) piece fitting or an assembly of forty-five (45) degree elbows.

structural conditions

Section 814 - Combination Waste and Vent Systems

Combination Waste and Vent Systems (CW & VS) shall only be permitted where _______________ prevent the installation of conventional systems as prescribed by this Code.

4.6 meters branch = separately vented

(15 ft)

Section 814 - Combination Waste and Vent Systems

Each CW & VS shall be provided with a vent or vents that ensure free air circulation. Any branch longer than __________ shall be separately vented in an approved manner.

one-half (1/2) of the pipe served = min. area of vent in CW & VS

Section 814 - Combination Waste and Vent Systems

The minimum area of any vent in a CW & VS shall be at least __________ the inside cross-sectional area of the drain pipe served. The vent connection shall be downstream of the uppermost fixture.

two (2) pipe sizes larger = min. size of waste pipes and trap in CW & VS

Section 814 - Combination Waste and Vent Systems

Each waste pipe and trap in any CW & VS shall be at least __________ larger than the sizes required by Chapter 7 of this Code, and at least _________ larger than any fixture tailpiece or connection.

vertical waste pipe

Section 814 - Combination Waste and Vent Systems

Unless specifically required or permitted by the Administrative Authority, no ___________ shall be used in any CW & VS, except for the tailpiece or connection between the outlet of a plumbing fixture and its trap.

600 mm = maximum tailpiece length

Section 814 - Combination Waste and Vent Systems

Tailpieces or connections shall be as short as possible and shall not exceed __________ in length.

air gap

Section 816 - Clear Water Wastes

Water from expansion tanks, cooling jackets, sprinkler systems, drip or overflow pans, or similar devices that discharge clear wastewater into the building drainage system shall discharge through an indirect waste using an __________

accessible cleanout

Section 814 - Combination Waste and Vent Systems

A/an ____________ shall be installed in each vent for the CW & VS.

51 mm fixture tailpiece = cleanouts for wet vents not required.

Section 814 - Combination Waste and Vent Systems

Cleanouts may NOT be required on any wet-vented branch serving a single trap if the fixture tailpiece or connection is at least ________ in diameter and provides ready access for cleaning through the trap.

indirect waste

Section 817 - Swimming Pools

Pipes carrying wastewater from swimming or wading pools, including:

- pool drainage

- backwash from filters

- water from promenade drains serving walks

- pumps used to discharge pool water to the drainage system

shall be installed as an ___________

32 mm (1.5 inches) - 2.8 cum.

51 mm (2 inches) - 4-12 cum.

76 mm (3 inches) - 12-36 cum.

Section 818 - Refrigeration Wastes

Pipe size for indirect waste lines carrying refrigeration wastes:

For inlets serving not more than 2.8 m³ of refrigeration space

32 mm (1.5 inches) - 2.8 cum.

51 mm (2 inches) - 4-12 cum.

76 mm (3 inches) - 12-36 cum.

Section 818 - Refrigeration Wastes

Pipe size for indirect waste lines carrying refrigeration wastes:

For 4 to 12 m³ of refrigeration space with 32 mm inlets or equivalent

32 mm (1.5 inches) - 2.8 cum.

51 mm (2 inches) - 4-12 cum.

76 mm (3 inches) - 12-36 cum.

Section 818 - Refrigeration Wastes

Pipe size for indirect waste lines carrying refrigeration wastes:

For 13 to 36 m³ of refrigeration space with 32 mm inlets or equivalent

indirect waste pipe

Section 819 - Air-Conditioning Equipment

If discharged into the drainage system, any evaporative cooler, air washer, or similar air-conditioning equipment shall be drained by means of an _____________

Assumptions:

- 1% slope

- pipe running 3/4 full

- Outside air - 20% (90 F dry bulb, 73 F wet bulb)

- Room air - 80% (75 F dry bulb, 62.5 F wet bulb)

Section 819 - Air-Conditioning Equipment

Air-conditioning condensate waste pipes shall be independent of any drainage and waste system and shall not be smaller than shown in Table 8-2.

a properly trapped receptor

Section 819 - Air-Conditioning Equipment

Air-conditioning condensate waste pipes shall connect indirectly to the drainage system through an airgap or airbreak to:

1. ________

2. Other points of discharge acceptable to the AA including dry wells, leach pits, the tailpiece of plumbing fixture, etc.