This article is about Vent Piping Connection Installation, Material, Types of Venting in Plumbing in commercial buildings, plants and refinery projects related to Plumbing Engineering System as per international codes and standards.
Vent Piping Connection Installation | Material | Types of Venting in Plumbing
- Following is the acceptable materials for vent piping:
a) Schedule 40 PVC DWV.
b) Same as drainage piping materials. - All piping (vent piping) within buildings shall be concealed unless otherwise indicated on the construction drawings.
- No galvanized wrought iron or steel pipe shall be used underground and shall be kept at least six (6) inches above ground (UPC Para 903.1.1).
- The diameter of an individual vent shall not be less than one and one-fourth (1-1/4) inches nor less than one-half the diameter of the drain to which it is connected. (UPC Para 904.1). Also see item No. A23 in this SAIC for extra requirements.
- Where vents connect to a horizontal drainage pipe, each vent pipe shall have its invert taken off above the drainage center line of such pipe downstream of the trap being served. (UPC 905.2)
Unless prohibited by structural conditions, each vent shall rise vertically to a point not less than six (6) inches above the flood level rim of the fixture served before offsetting horizontally (UPC Para 905.3) - Whenever two or more vent pipes converge, each such vent pipe shall rise to a point six (6) inches minimum in height above the flood level rim of the plumbing fixture it serves before being connected to any other vent (UPC Para 905.3).
- Vents less than six (6) inches above the flood level rim of the fixture shall be installed with approved drainage fittings, material and grade to drain.(UPC Para 905.3)
- Each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than six (6) inches above the roof nor less than one (1) foot from any vertical surface (UPC Para 906.1).
- Each vent shall terminate not less than ten (10) feet from, or at least three (3) feet above any openable window, door, opening, air intake, or vent shaft, nor less than three (3) feet in every direction from any lot line; alley and street excepted (UPC Para 906.2)
- PVC DWV piping installation shall be limited to those structures where combustible construction is allowed.
- Vent pipes for outdoor installation shall extend at least ten (10) feet above the surrounding ground and shall be securely supported.
- Vents from chemical and acid waste systems, including the neutralization tank vent, shall not be connected to any waste venting system except a dedicated system.
- All vent pipes shall extend undiminished in size above the roof or shall be reconnected with a soil or waste vent of proper size.
- Vent pipe opening from a soil or waste pipe, except for water closets or similar fixtures shall not be below the weir of the trap.
- Two (2) fixtures may be served by a common vertical pipe when each such fixture wastes separetly into an approved double fixture fitting having inlet openings at the same level.
- Vent from indirect waste shall extend separately to the outside air. (UPC Section 803.0)
- No vent from indirect waste piping shall combine with any sewer connected vent. (UPC Section 803.0)
- Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) and two (2) fixture unit fixtures that also serves as a vent for not to exceed four (4) fixtures.
- All wet vented fixtures shall be within the same story and shall not exceed six (6) feet in developed length.
- Fixtures with a continuous vent discharging into a wet vent shall be within the same story as the wet vented fixture.(UPC Para 908.1)
- Each wet vented section (Vertical piping between any 2 consecutive inlet levels) shall be a minimum of one pipe size larger than the required minimum waste pipe size of the upper fixture or shall be one pipe size larger than the required minimum pipe size for the sum of the fixture units served by such wet vented section, which ever is larger, but in no case smaller than 2 inches. (UPC Para 908.2)
- Voids around piping passing through concrete floor shall be sealed (UPC Para 313.1)
- No piping shall be embedded in concrete or masonry (UPC Para 313.2)
- No vents underground or below a floor slab, basement or cellar shall be less than 2″ in nominal diameter.
- All vent and branch vent pipes shall be free from drops or sags and each such vent shall be level or graded and connected as to drip back by gravity to the drainage pipe it serves.
- All vent and branch vent pipes shall be free from drops or sags and each such vent shall be level or graded and connected as to drip back by gravity to the drainage pipe it serves.
- Use of combination waste and vent system shall be first approved by the Chairman of the Plumbing & Utilities Standards Committee before any portion of any such system is installed.
- Each waste pipe and each trap of a combination waste-vent system shall be at least two (2) pipe sizes larger than the normal drain piping system required and at least two (2) pipe sizes larger than anu fixture tailpiece or connection.
International Codes and Standard References for Vent Piping Connection Installation
1-SAES-S-060 – Saudi Aramco Plumbing Code.
2-SAES-S-010 – Sanitary Sewers.
3-Uniform Plumbing Code (UPC).
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