×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pump Start/Stop

Pump Start/Stop

Pump Start/Stop

(OP)
Hello everbody

can anyone please help me in answering the below questions

1. what is the logic behind number of start/stops for domestic water pumps, is there any formula or calculations for the same ?

2. How to calculate the expansion tank size for the booster pumps, is the tanks size also related to the number of starts and stops of the pump??

thanks

RE: Pump Start/Stop

It is dependant on the electric motor and the heat rise from continual starts which doesn't allow it to cool sufficiently. It has nothing to do with the pump. The information is from the motor manufacturer based on testing.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Start/Stop

As Artisi suggests, once you have the allowable number of starts per hour from the motor manufacturer, then you can size the holding tank for the expected demand and allowable starts per hour. This is the same problem faced in the design of sewage lift stations, specifically the wet well size. If you google "wet well sizing" you can find lots of guidance. You'll need to substitute 'water demand' for 'sewage inflow', but otherwise, it's the same problem.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources