2. Water supply. Flashcards
- Where is a corporation stop located in a water service line?
The corporation stop is located at the tap in the water main.
- Why are water mains usually cross-connected?
To eliminate dead ends in the mains and maintain a constant movement of the water to prevent stagnation.
- In a water supply system how will the flow in the water service compare with the simultaneous flow of all connected fixtures?
The flow in the water service will rarely be equal to the simultaneous flow of all connected fixtures, because the possibility of all fixtures being used at the same time is very remote.
- What is an important factor which determines the minimum size for water services in a city?
The normal pressure maintained in the city mains usually determines the minimum size for water services.
- Why should newly drilled water wells be cleaned and sterilized before being used?
Most newly constructed wells are contaminated through the process of drilling and the storing and handling of materials used. After cleaning, the well should be sterilized, an operating frequently required by State Boards of Health. A chlorine solution made from chlorinated line and water is commonly used for sterilization purposes.
- What is a well seal?
A. well seal is a fitting or device easily installed on the top of well casing to prevent surface contamination.
- Sizing a water service steps?
- Determine FU total demand.
- Min daily static pressure at meter or source.
- Subtract 1/2 lb. pressure per feet of rice or add for fall.
- Deduct pressure losses for filter, regulators, etc.
- Find pressure range group in tables.
- Find column for developed length to most remote fixtures. Multiply actual length to most remote fixture by 1.2 to compensate for loss at fittings.
- Find row meeting required total FU demand.
- Find required meter and pipe size in left columns of tables.
- Find required meter and pipe size in left column of table.
