Cast Iron Flashcards
What does DWV stand for?
Drain waste vent
What is the role of a DWV system?
Intended to remove waste water and accompanying solids from the points of water usage.
What does the DWV system rely on to transmit waste?
Gravity. It is not a pressurized system like supply lines
Why is a carefulpiping layout required for the venting requirements of the DWV system?
To maintain atmospheric pressure in all areas and prevent the unwanted siphoning of water from the traps
What is the significance of the proper pitch of the lines to facilitate the proper movement of waste water and solids?
If the line is not pitched enough the overall flow will be retarded. If the line is pitched too much, the water will drain to rapidly, leaving a company and wastes stranded.
Why is resistant to corrosion of greater concern with DWV pipe?
There is more than just water being transmitted through the drainage system. Human wastes, food waste, and chemicals
What should be considered to avoid noisy plumbing?
DWV piping material with adequate noise insulation qualities, such as insuring an appropriate pipe diameter and use of PVC versus cast iron
Why do DWV fittings differ significantly from Supply fittings?
There are solids in the waste water, so the fittings must be designed for on obstructed passage of waste water in relation to the mating pipe sections - no protruding shoulders
Also avoid sharp turns internally, to prevent waste solids from being held up on the Bends
For example sanitary tees, have more gently curved internal passageways
Why are local code requirements important to consider?
You have to deal with the realities of what is or isn’t approved in your area.
What are the three basic types of DWV plumbing materials used?
Cast iron, copper, and plastic (ABS or PVC)
What Kleenex is to tissues, blank is to DWV systems
Cast-iron soil pipe
What does a soil pipe only referred to
Cast-iron only
What are the advantages of cast-iron?
Distance to corrosion, piercing, crushing
Quiet sound insulating service
Versatility of joint methods
How is cast-iron created?
By a casting process - Pouring molten iron into a mold through a centrifugal casting process but the mold is spinning in the molten iron is spread evenly with in the mold
What are the two basic types of soil pipe based on the two installation processes involved?
Hub & Spigot
No-Hub
