Ch. 7 - House Drain

House Drain

________ is that portion of the plumbing system that receives discharges of all soil and waste stacks within the buildings and conveys the same to the House Sewer. It is sometimes referred to as the Collection Line of a Plumbing System.

Combined Drain

Sanitary Drain

Storm Drain

Industrial Drain

Types of House Drain (4)

Combined Drain

________ is a type of hose drain that receives discharges of sanitary waste as well as storm water. This is the oldest form of house drain. This type of house drain however, is already phase out and no longer permitted.

Sanitary Drain

________ receives the discharges of sanitary and domestic waste only. The waste is conveyed to a public sewer, or septic tank, by the house sewer. Storm water is not allowed in the ________.

Industrial Drain

________ is a house drain that receives discharges from industrial equipment that contain some objectionable acid wastes. ________ that contains acid waste terminates into a separate drainage basin.

Storm Drain

________ conveys all storm clear water, or surface water waste except sanitary wastes. ________ terminates into lake, river, dry run or natural basin.

Unit System

The ________ is the most practical method to use in determining the size of a house drain. It has been formulated from tests conducted by the Uniform Plumbing Code Committee.

Uniform Plumbing Code Committee

________ is a body consisting of representatives of management, labor, and government standard agencies. ________ formulated the Unit System from conducted tests.

Washbasin

________ is the smallest type of plumbing fixture. This would discharge waste approximately 7.5gallons (1ft^3) in one minute interval.

One Fixture Unit

________ represents 30L of water (per minute interval).

Roof Area

For storm drain, the ________ that accumulates the major rainfall water will be the basis in determining the size of the pipe.

75mm

No water closet shall discharge into a drain less than ________ pipe diameter.

2

No more than ________ water closets shall discharge into any 75mm horizontal soil branch, house drain or house sewer.

Note: NPCP states maximum of 4 water closets for a 3in stack and 3 water closets for a 3in branch or drain.

1%

Long sewer line would require lower pitch but should not be less than ________. In the case

100mm

2in

45 deg

Any branch of the house drain terminating at a floor drain or fixture shall be provided with ________ diameter pipe, extended at least ________ above the floor inserted in ________ Y branch in the direction of the flow.

Floor Drain

A cleanout extended above the floor shall not be utilized as a ________.

50cm

The trap of a floor drain shall be placed not more than ________ below the finished floor line to facilitate cleaning in case of line trouble.

20m

A cleanout shall be installed at every ________ interval distance, and also at the base of all soil and waste stack.

Note: NPCP requires a cleanout at every 15m length or a fraction thereof of each horizontal drainage pipe.

House Trap

________ is defined as a device installed in the house drain immediately inside the foundation wall of the building. It serves as a barrier and prevents the gases coming from the public sewer or septic tank in circulating through the plumbing system.

Back Flow Valve

________ is a device used in drainage system to prevent the reversal of flow. It is installed in a house drain or branches of the house drain that are subjected to reversal flow of liquid. The ________ is installed on the house drain, just near the foundation wall or near the toilet room under floor. It is set in a level position to attain its full effectiveness.

Balanced Valve

Unbalanced Valve

Patterns of Back Flow Valve (2)

Balanced Valve

________ is the most preferred back flow valve because it has the characteristics of non-interferences in the movement of air inside the drainage system. The interior mechanism consists of a brass-seat into which fitted a gate counter balanced with an adjustable cast iron weight.

Unbalanced Valve

________ is a back flow valve similar to the balanced valve. This type of valve is not preferred because of its recorded poor performance in the past.

Area Drain

________ consists of a running trap installed under the basement floor to protect it from freezing. The trap is equipped with a cleanout. It is used to drain basement entryways, loading platforms, or driveways.

100mm

The minimum size of an area drain is ________ to drain basement entryways, loading platforms, or driveways.

Floor Drain

________ is a receptacle used to receive water to be drained from the floor into the plumbing system. Every room where laundry equipment is used shall be provided with adequate ________.

2

An average residence is provided with ________ floor drains. One located near the heating equipment, and the other in the vicinity of the laundry.

Note: Add one below the kitchen sink.

House Side

Fixture drains which supply water to a floor drain should be connected to the ________ and never to the sewer side of the trap.

75mm

Experienced plumber will not install P-trap smaller than ________ diameter on floor drain.

20cm

A 75mm P-trap is recommended minimum size for floor drain. It should be installed not more than ________ below the floor line.

Note: Check NPCP provision for P-trap and floor drain.

Deep Seal

The P-trap for floor drains should be ________ type.

Low Inlet Hub

The ________ pattern P-trap is commonly used as floor drain.

Yard Catch Basin

________ is defined as a receptacle used to catch surface water drained from cemented courts, driveways, and yards. It could be a terminal for drain tile installations used to drain water from athletic fields.

Garage Catch Basin

________ is a device designed to convey wastes from garage, wash rack, grease pits, and repair floors into the house drain. Wastes coming from these areas contain objectionable elements that are detrimental to the drainage installation as well as the sewage disposal system.

Grease Basins

________ installed on the waste line to overcome stoppage caused by grease and oil contained in the waste discharges.

Earth Cooled

A grease trap placed on the ground is ________. This is used on large installations and is most desirable type.

60cm

The grease basin width should not be less than ________. The length should be 3 to 4 times its width to attain a smooth and non-agitated flow.

120cm

The minimum depth of concrete grease trap should not be less than ________ below the outlet invert.