plumbing 1

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Questions and Answers

What is the minimum depth for backfilling over any piping?

6 inches

30 inches

36 inches

12 inches (300 mm) (correct)

At what intervals should 2-inch horizontal copper tubing drain pipe be supported?

4 ft intervals

12 ft intervals

6 ft intervals (correct)

10 ft intervals

What is the maximum spacing for bracing horizontal hubless pipe?

30 ft intervals

50 ft intervals

20 ft intervals

40 ft intervals (correct)

What should voids around piping passing through concrete floors be?

Sealed Signup and view all the answers

Which standard must all materials, fixtures, or devices used in plumbing adhere to?

Approved applicable standards Signup and view all the answers

An alternate material or method of construction must be approved by?

The authority having jurisdiction Signup and view all the answers

Where should pipe joint material be applied?

On pipe threads and inside fittings Signup and view all the answers

What method should be used to clean surfaces prior to soldering or brazing?

Mechanical or manual means Signup and view all the answers

What must every water supply to a urinal be protected by?

Vacuum breaker Signup and view all the answers

What is the requirement for trough urinals?

Prohibited Signup and view all the answers

How are shower drains and floor drains required to provide a watertight joint?

Suitably flanged Signup and view all the answers

What is the minimum diameter of a circle that shower compartments and receptors must be capable of enclosing?

$30$ inches (762 mm) Signup and view all the answers

Under what circumstance may the curb or threshold of a shower compartment be eliminated?

To comply with accessibility standards Signup and view all the answers

What material may shower pan linings be constructed with?

3 lbs per square foot lead Signup and view all the answers

What is the minimum distance allowed center to center for water closets set side by side?

18 inches Signup and view all the answers

How many urinals can be flushed by one manually controlled flushometer valve?

One urinal Signup and view all the answers

What materials can be used to secure fixtures according to plumbing standards?

Copper, brass, or other corrosion-resistant materials Signup and view all the answers

What is the requirement for supporting wall hung fixtures?

They must be supported by metal members to prevent strain on the wall. Signup and view all the answers

What type of valves can be used instead of automatic flush tanks?

Automatically controlled flushometer valves Signup and view all the answers

Which type of material is NOT suitable for constructing shower receptors?

Plastic Signup and view all the answers

What should the finished floor of the shower receptor do in relation to the drain?

Slope uniformly towards the drain. Signup and view all the answers

What is the minimum requirement for a clothes washer when installed in groups of three or more?

6 DFU for each washer Signup and view all the answers

What minimum width must the threshold accommodate for a door?

22 inches (559 mm) Signup and view all the answers

Which statement about flushometer valves is true?

Each flushometer valve must discharge a predetermined quantity of water. Signup and view all the answers

What is the minimum weight for constructed material for lead pans or liners?

19.6 kg/m2 Signup and view all the answers

What is the minimum thickness for copper pans or liners?

GA. 24 B & S (0.5 mm thk) Signup and view all the answers

What is the purpose of having a removable panel in whirlpool bathtubs?

Access to the pump Signup and view all the answers

How should shower receptors be tested for water-tightness?

Filling with water to the level of the rough threshold Signup and view all the answers

Who is responsible for maintaining the plumbing and drainage system of the premises?

Owner’s agent Signup and view all the answers

What test is used to check the tightness condition of the plumbing system?

Water test Signup and view all the answers

What is the required number of drinking fountains per occupied floor in specific public buildings?

1 drinking fountain Signup and view all the answers

After plumbing fixtures have been set, what must they undergo?

A final test Signup and view all the answers

What is the minimum thickness for continuous waste and fixture tailpieces when made of seamless drawn brass?

1.6 mm Signup and view all the answers

What is the minimum diameter for the tailpiece of sinks, dishwashers, and similar fixtures?

1 1/2” OD Signup and view all the answers

Which of the following statements regarding brass or copper usage for urinal tailpieces is accurate?

Brass or copper shall not be used for urinal tailpieces. Signup and view all the answers

What type of branch fittings should be installed for continuous waste connecting to forced-discharge fixtures?

Wye or other directional type branch fittings Signup and view all the answers

Is it permitted to connect a dishwasher drain to a sink tailpiece on the discharge side of a food waste disposal unit?

No, it is prohibited. Signup and view all the answers

What type of water closet is prohibited due to the risk of siphonage back into the water tank?

Water closets permitting siphonage Signup and view all the answers

Fixed wooden wash trays or sinks are allowed in buildings designed for human habitation.

False, they are not allowed. Signup and view all the answers

Is it acceptable to install sheet metal lined wooden bathtubs in residential buildings?

No, it is prohibited. Signup and view all the answers

Study Notes

Backfilling

Mechanical devices may be used to complete backfilling when covering piping is at least 30 inches.

Horizontal Copper Tubing Drain Pipe

2 inch horizontal copper tubing drain pipe shall be supported at 6 ft intervals.

Horizontal Hubless Pipe

Horizontal hubless pipe should be braced at intervals of no more than 40 ft to prevent horizontal movement.

Voids Around Piping

Voids around piping passing through concrete floors should be packed.

Plumbing and Drainage Systems Construction

All materials, fixtures, or devices used in the construction of plumbing and drainage systems should conform to approved applicable standards.

Alternate Materials or Methods of Construction

Alternate materials or methods of construction are allowed if approved by the authority having jurisdiction.

Pipe Joint Material

Pipe joint material should be insoluble in water, nontoxic, and applied on pipe threads and inside fittings.

Wipe Joints

Wipe joints are permitted with lead.

Tub Waste Openings Protection

Tub waste openings in framed construction should be protected by metal collars or screens.

Surfaces for Soldering or Brazing

Surfaces for soldering or brazing must be cleaned bright using mechanical or manual means.

Closet Bends or Stubs

Closet bends or stubs should be cut off so that the surface is even with the top of the finished floor.

Tanks Flushing Urinals

Tanks flushing more than one urinal must be automatic in operation.

Water Supply Protection for Urinals

Every water supply to a urinal should be protected by an approved vacuum breaker.

Trough Urinals

Trough urinals are prohibited.

Shower Drains and Floor Drains

Shower drains and floor drains need to be suitably flanged to provide a watertight joint in the floor.

Shower Compartments and Receptors

All shower compartments and receptors should be capable of encompassing a 30 inch diameter circle, except for two noted exceptions.

Shower Compartment Threshold

The curb or threshold of a shower compartment can be eliminated to comply with accessibility standards.

Shower Pan Linings

Shower pan linings can be constructed with 26 B & S gauge copper.

Copper Shower Pan Liners

Joints in copper shower pan liners should be soldered or brazed.

Water Closets Placement

Water closets set side by side should be no closer than 18 inches center-to-center.

Distance from Wall to Urinal

The minimum distance from a side wall or partition to the center of a urinal should be 18 inches.

Manually Controlled Flushometer Valves

Manually controlled flushometer valves cannot be used to flush more than two urinals.

Automatically Controlled Flushometer Valves

Automatically controlled flushometer valves can be substituted for automatic flush tanks.

Gutters in Public Shower Rooms

Gutters in public shower rooms should be sloped at least 2 percent.

Dry or Chemical Closets

Dry or chemical closets (toilets) are prohibited in any building used for human habitation, unless approved by the health officer.

Continuous Waste and Fixture Tailpiece

Continuous waste and fixture tailpieces, when exposed or accessible, can be made of seamless drawn brass and have a gauge of at least G.A 16 (1.6 mm THK).

Tailpiece Dimensions

Sinks, dishwashers, laundry tubs, bathtubs, urinals, and other similar fixtures should have a tailpiece, continuous waste, or waste and overflow with a minimum diameter of 1.5 inches (38 mm OD).

Smaller Fixture Tailpiece Dimensions

Lavatories, drinking fountains, and similar small fixtures should have a tailpiece, continuous waste, or waste and overflow with a minimum diameter of 1.25 inches (32 mm OD).

Brass or Copper for Urinal Tailpiece or Trap

Brass or copper should not be used for urinal tailpieces or traps.

Branch Fittings for Food Waste Disposal Units

Wye fittings or other directional type branch fittings should be used for continuous waste connecting to food waste disposal units, dishwashers, clothes washers, or other forced-discharge fixtures or appliances.

Dishwasher Drain

Dishwasher drains cannot be connected to a sink tailpiece, continuous waste, or trap on the discharge side of a food waste disposal unit.

Siphonage and Trough Urinals

Any water closet or trough urinal that permits siphonage of the contents of the bowl or urinal back into the water tank or piping is prohibited.

Wash Trays or Sinks

Fixed wooden, concrete, cement, or tile wash trays or sinks for domestic use are not allowed in buildings designed for human habitation.

Sheet Metal Lined Wooden Bathtubs

Sheet-metal lined wooden bathtubs are prohibited.

Dry or Chemical Closets (Toilet)

Dry or chemical closets (toilets) are prohibited in any building used for human habitation unless approved by the health officer.

Plumbing Fixture Placement

Plumbing fixtures should be run parallel and close to the nearest wall or building line.

Joint Between Fixtures and Wall or Floor

The joint between fixtures and the wall or floor should be watertight.

Securing Fixtures

Fixtures should be rigidly secured using appropriately-sized screws or expansion bolts made of copper, brass, or other corrosion-resistant material.

Wall-Hung Fixtures

Wall-hung fixtures should be rigidly supported by metal supporting members or chairs to avoid bending or pullout strain on the wall.

Securing Flush Tanks

Approved non-corrosive screws or bolts should be used to secure water closet and urinal flush tanks and similar appurtenances.

Fixture Alignment

Fixtures should be set level and in proper alignment with reference to adjacent walls.

Supply Lines and Fittings

Supply lines or fittings for every plumbing fixture should be installed to prevent backflow.

Flushometer Valves Replacement

Automatically controlled flushometer valves can replace automatic flush tanks.

Manually Controlled Flushometer Valve Restriction

Manually controlled flushometer valves cannot be used to flush more than one urinal, and each valve should be self-closing and discharge a predetermined quantity of water.

Floor Drain Placement

Floor drains, floor receptors, and shower drains should have a water stop outside flange around the body at mid depth and an inside caulk outlet to create a watertight joint in the floor.

Shower Receptor Construction

Shower receptors should be constructed of vitrified china, earthenware, ceramic tile, porcelain-enameled metal, or other approved material.

Clothes Washer Waste Discharge Piping

Clothes washers in groups of three or more should have a drain with a rating of 6 DFU.

Shower Receptor Construction (Exception)

Shower receptors cannot be made of earthenware.

Shower Threshold Width

The shower threshold should be wide enough to accommodate a door with a minimum of 22 inches (559 mm) width.

Finished Shower Floor Slope

The finished floor of the shower receptor should slope uniformly from the sides towards the drain not more than 40 mm/m (4%).

Lead Pan or Liner Weight

Lead pans or liners should weigh at least 19.6 kg/m2.

Copper Pan Thickness

The thickness of copper pans or liners should be at least G.A 24 B & S (0.5 mm thk).

Lead Pan or Liner Joints

Joints in lead pans or liners must be burned.

Whirlpool Bathtubs

Whirlpool bathtubs should have a removable panel that provides access to the pump.

Whirlpool Bathtub Pump Piping

The pump and circulating piping in whirlpool bathtubs should be self-draining to minimize water retention.

Water Closet Requirement (Females vs. Males)

The total number of water closets for females should be at least equal to the total number of water closets and urinals for males.

Drinking Fountain Requirements

There should be at least one drinking fountain per occupied floor in schools, theaters, auditoriums, dormitories, offices, or public buildings.

Shower Receptor Watertightness Test

Shower receptors should be tested for watertightness by filling them with water to the level of the rough threshold.

Plumbing and Drainage System Maintenance

The owner's agent is responsible for maintaining the plumbing and drainage system of the client premises.

Plumbing System Tightness Test

A smoke test should be used to test the tightness condition of the drainage or plumbing system in any building premises when there is reason to believe that it has become defective.

Final Plumbing Fixture Test

After plumbing fixtures have been set and their traps are filled with water, they should be submitted for a final test.

Retesting Plumbing Work

If the Administrative Authority finds that the work will not pass the test, the work should be resubmitted for another test and an appropriate fee will be assessed.

Water Test Procedure

All openings in the piping should be tightly closed except the highest opening during the water test.
No section should be tested with less than 10 ft of water.

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