PRIVATE WATER SYSTEMS - Piping - Planning the Layout

Planning the Layout

Planning the piping layout involves the piping that goes from the pumphouse to the home and service buildings. The first step is to determine how much water demand there will be at each building, or at each outside hydrant. The only difference between determining the demand on the pump is that the demand must be determined separately for each location.

Water Demand at Various Locations

Determining Where to Place the Pipelines

Water Demand At Various Locations

  1. Step 1: List all the home uses and the "peak demand allowance" (PDA) for each using the table from determining the demand on the pump;
    Home Peak Allowance (gpm)
    Comb. Tub & Shower 2.00
    2 Lavatory 1.00
    1 Toilet .75
    1 Kitchen Sink .50
    1 Dishwasher2.00

  2. Step 2: Determine which use has the greatest fixture flow rate (FFR)

  3. Step 3: Substitute the FFR of the heaviest water use for its PDA
    Home Peak Allowance (gpm)
    Comb. Tub & Shower 2.00 -> 8.00
    2 Lavatory 1.00
    1 Toilet .75
    1 Kitchen Sink .50
    1 Dishwasher2.00

  4. Step 4: Add any competing demand such as lawn or garden sprinkling, if supplied from home plumbing system, Then total.
    Home Peak Allowance (gpm)
    Comb. Tub & Shower 8.00
    2 Lavatory 1.00
    1 Toilet .75
    1 Kitchen Sink .50
    1 Dishwasher+ 2.00
     
    13.25
    Lawn Sprinkler+ 5.00
     
    18.25

  5. Step 5: Determine the water demand for other buildings using the same steps used for determining the demand for the home.

  6. Step 6: Determine the demand for outdoor water uses such as yard hydrants and a swimming pool.

Note that by totaling the demands for the home with those for the service buildings and yard hydrants, the total is much greater than the demand figured for the pump. This is because the peak demand changes throughout the day from one building to the next, because many uses are not likely to be occurring at the same time.

Determining Where to Place the Pipelines

In planning the piping layout, things to keep in mind are locations of asphalt and concrete paving, and where to locate the cutoff valve so that the least disruption will be caused by the servicing of pipelines. Select the word procedure to see a method of laying out the piping installation.

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