Venting RequirementsThe requirements set forth by the 2000 Standard Plumbing Code for the venting of plumbing systems are some what different than what was found in the earlier editions. When the International Plumbing Code was developed as a nationalcode, they reviewed the three major plumbing codes used across the nation. What they found was that the venting requirements used in the southeastern area of the U.S. were, for the most parts, outdated. Other plumbing codes had been updated because of new data and products butthe code used in Georgia was not. We used the philosophy that“If it ain’t broke don’t fix It “.Many of the changes in this chapter have been used in other parts of our nation and over seas for decades without any problems. This classwill look at many of the changes and the major requirements for venting plumbing systems.
Understand that venting and air flow is necessary throughout thesystem. Venting is used to equalize air pressure to insure the proper movement of waste and fluids from the point where it is introduced into the system to its place of disposal. VENTDRAINDRAINDRAIN LINE OR SEWERLower half is for the movement of waste and the top halfallows the movement of air.VENTWasteAirDRAIN SHOULD NEVER BE MORE THAN HALF UNDER MAXIMUM USE CONDITIONS.
901.2 Trap seal protection. The plumbing system shall be provided with a system of vent piping that willpermit the admission or emission of air so that the seal of any fixture trap shall not be subjected to a pneumatic pressure differential of more than 1 inch of water.■(Trap seals are generally 2 inches and morethan 1 inch water column pressure can causeloss of trap seals)
SECTION 903 VENT STACKSANDSTACK VENTS
1994 STANDARD PLUMBING CODESECTION: 904 VENT STACKS■904.3 Main Stack904.3.1Every building in which plumbing is installed shall have at least one mainvent stack or vent stack, of not less than 3 inch diameter, for each building drain when connect separately to a building sewer or septic tank.Such stackshall run undiminished in size and as directly as possible from the buildingdrain through to the open air or to vent header that extends to the open air.