Plumbing 5 Vent Systems

Flashcards about Sanitary Science As Applied to Buildings - Vent System

Vent Purpose

Entry of air to balance pressure and protect trap seals by permitting admission or emission of air.

Maximum Pressure in Fixture Trap

No more than 1 inch of a water column (249Pa).

Sewer Gases

Toxic and non-toxic gases like Methane, Hydrogen Sulfide, Ammonia, and Carbon Dioxide.

Trap Seal Primer

Used when trap seal is lost due to evaporation.

Circuit Vent Location

Location between two most upstream fixture drains.

Maximum Slope of Horizontal Drain

3%

Relief Vent

Provided with 4 or more water closets

Circuit Vent

Connects to a horizontal drainage branch and vents two traps to no more than eight traps or trapped fixtures connected into a battery.

Individual Vent / Back Bent

Pipe installed to vent a fixture trap and that connects with the vent system above the fixture served or terminates in the open air.

Stack Vent

Extension of a soil or waste stack above the highest horizontal drain connected to the stack.

Stack Venting

Method of venting a fixture or fixtures through the soil or waste stack.

Vent Stack

Vertical vent pipe installed primarily for the purpose of providing circulation of air to and from any part of the drainage system.

Dry Vent

Vent that does not carry liquid or water-borne wastes.

Wet Vent

Portion of a vent pipe through which wastewater also flows.

Developed Length of Vents

Measured from the farthest point of vent connection to the drainage system to the point of connection to the vent stack, stack vent, or termination outside of the building.

Minimum Size of Individual Vent

One-half the required drain size.

Minimum Size of Vent Stacks and Stack Vents

One-half the size of the drain served.

Vents required

Each trap shall be protected against siphonage and back-pressure through __.

Trap Seal Protection

Designed to prevent a trap seal from being exposed to a pressure differential that exceeds 1 inch of a water column on the outlet side of the trap.

Galvanized steel or 304 stainless steel pipe

Shall not be used underground and shall be kept at least 150mm above ground.

ABS and PVC DWV

Piping installations shall be installed in accordance with IS 5, IS 9 and Chapter 15.

Copper tube

For underground or above-ground drainage and vent piping shall have a weight of not less than that of copper drainage tube type DWV.

Hard drawn copper tubing color

Type K-green, Type L-blue, Type M-red, Type DWV-yellow

Size of Vents

Shall not be less than 1-1/4 (32mm) nor less than 1/2 the diameter of the drain to which it is connected.

Vent Pipe Grades

Vent and branch pipe vent pipes shall be free from drops or sags, and each such vent shall be level or shall be so graded and connected as to drop back by gravity to the drainage pipe it serves.

Vents connect to a horizontal drainage pipe

Each vent pipe shall have its invert taken off above the drainage centerline of such pipe downstream of the trap being served.

Each vent shall rise vertically

Each vent shall rise vertically to a point not less than 150mm above the flood level rim of the fixture being served before offsetting horizontal.

Vent

Shall extend undiminished in size above the roof or shall be reconnected with a soil or waste vent of proper size.

Each vent opening

Not terminate not less than 3m from or at least 0.9 m above any operable window, door opening, air intake or vent shaft; at least 0.9 m in. away from any lot line, alley & street boundary lines.

Vent pipes for outdoor installations

Shall extend not less than 3m above the surrounding ground and shall be securely supported.

Vent Stacks & Relief Vents

Each soil or waste stack extending ten (10) or more storeys above the building drain shall be served by a parallel which shall extend undiminished in size from its upper terminal at roof and connect to the soil or waste stack at ground level and every fifth floor level with a "yoke vent" at a point below the horizontal soil or waste branch connection to the stack and at the nearby vent stack above the same floor to provide a relief vent.

Vertical Wet Venting

Limited to vertical drainage piping receiving the discharge from the trap arm of 1 and 2 fixture unit fixtures that also serves as a vent not exceeding 4 fixtures.

Horizontal Wet Venting for Bathroom Groups

1 or 2 bathroom groups located on the same floor level and for private use shall be permitted to __.

Air Admittance Valves (AAV)

Device designed to allow air to enter the drainage system to balance the pressure and prevent siphonage of the water trap when negative pressure develops in the system.

Circuit Venting

Loop Vent - form of __.

Circuit Venting

__ venting connection shall be located between the two most upstream fixture drains and shall shall not receive discharge of any soil or waste.

Waste Stack Vent

A __ shall be considered vent for all of the fixture discharging to the stack where installed in accordance with the requirements of this section.