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

Suction strainers for the two fire water pumps

Suction strainers for the two fire water pumps

Suction strainers for the two fire water pumps

Hope someone could recommend me the appropriate mesh size for suction strainer of fire water pumps.

We have installed fire water pumps recently as bellows.
   1) Main pump #1: 3,000 GPM (Driven by electric motor)
   2) Main pump #2: 3,000 GPM (Driven by diesel engine)
   3) Jockey pump : 300 GPM (Driven by electric motor)
   *. Discharge pressure: 10Bar
   *. Water tank capa': 5,000 M3 ( H: 20 METER, D: 18 METER)

The problem is the suction strainers on the pumps.
It's 40mesh strainer. During the 8hours test run, the strainer clogged. We consider that the mesh size is not acceptable for the pumps.
I contacted the manufacture of the pumps and received the data as follows.
 *Maximum passing sphere size through impeller, single stage:
     Maker: Peerless ,  fire pump. cetrifugal
     Motor pump:  0.95 inch (Pump model 10AEF20)
     Engine pump:  1.38 inch (Pump model 8AEF15A)

With above data, it's very difficult for us to decide the appropriate mesh size for the pump.
Someone told me that NFPA does not allow suction strainer for the fire water pumps. Is that correct?

Regarding the water quality, it's relativeley clean.
The water is supplied from the make-up water for cooling water.

Best regards

RE: Suction strainers for the two fire water pumps

I cannot comment on the NPFA spec - The  easy way to find out is - ask the NFPA authority, but I can see the logic in not having inlet strainers, from the point you have already demonstrated in your test run, a blocked strainer that rendered the pump inoperative while your wharehouse burnt to the ground..

So what caused the strainers to become blocked during your test run, the water supply for a fire pump should be from a clean source not requiring any inlet strainer. In your case as you are using the make up water for a cooling tower
it is possible that some foreign matter could in fact get into the supply source - you therefore need to exclude this by use of trash screen or similar between the pump inlet pipe and the source.

International College
Naresuan University

RE: Suction strainers for the two fire water pumps

I would add to my previous note: the trash screen should be located away from the pump inlet pipe work and sized so as not to impeded flow to the pump/s when considerably fouled.

International College
Naresuan University

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! Already a Member? Login


White Paper - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close