Vertical Stack Drainage System

A stack is a main vertical pipe that carries away discharge from within a facility of water closets and urinals soil stack or other water waste from equipment and non sanitary fixtures waste stack.

Vertical stack drainage system.

The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using table 710 1 2. The upc defines a stack as the vertical main of a system of soil waste or vent piping extending through one or more stories uniform plumbing code definitions. Branch drainpipes of smaller diameter typically 1 1 2 or 2 inches carry water from specific fixtures to a stack. The upper part of the vertical soil stack provides the venting component of the dwv system.

If you must run drainpipes across a floor carefully calculate the amount of vertical space available. In this system only one vertical soil pipe is used. History of drainage sizing. The vent allows the entire drain system to maintain equal air pressure.

The centerpiece of a dwv system is the main stack usually a pipe 3 or 4 inches in diameter that runs straight up through the roof. The wastes from all the sanitary and soil appliances are discharged in the same pipe. As water drains down the steep slope at the wye it can create a siphon effect such that water will be sucked out of the trap. There are four systems of plumbing of drainage work in a building such as single stack system one pipe system two pipe system one pipe partially ventilated system.

Vertical drainage stack pipe can be single or multiple pipe due to the several types of discharge sewerage bath kitchen abstergent from the washing machine rain water see figure 5 and to prevent the drainage pipe from being choked by waste water with oil and cleanser. A secondary stack perhaps 2 or 3 inches in diameter serves a branch of the system. If you follow it upward the vent stack penetrates through the roof of your home where it is open to the outside air. The sovent system prevents pressure excursions from exceeding one inch of water column which is the standard for sanitary drainage systems.

Table 710 1 1 building drains and sewers for si. Connecting a trap to a vertical drain with a wye fitting and a 45 degree elbow seems like a good idea. The stack is called a drain stack below the highest point at which waste drains into it. 3 and sovent de aerator fittings fig.

The stack is the largest vertical pipe into which all the horizontal and smaller vertical pipes either drain or vent. 1 horizontal branches to each fixture fig. 1 inch 25 4 mm 1 inch per foot 83 3 mm m. A sovent system consists of a vertical stack open to the atmosphere fig.

You must slope the drainpipe at 1 8 to 1 4 inch drop per. It may be possible to simplify supply runs by moving a vent pipe over a few inches. And the empty trap will allow sewer gas to flow into your home.