Leader

Collapse

Announcement

Collapse

Firehouse.com Forum Rules & Guidelines

Forum Rules & Guidelines

Not Permitted or Tolerated:
• Advertising and/or links of commercial, for-profit websites, products, and/or services is not permitted. If you have a need to advertise on Firehouse.com please contact [email protected]
• Fighting/arguing
• Cyber-bullying
• Swearing
• Name-calling and/or personal attacks
• Spamming
• Typing in all CAPS
• “l33t speak” - Substituting characters for letters in an effort to represent a word or phrase. (example: M*****ive)
• Distribution of another person’s personal information, regardless of whether or not said information is public knowledge and whether or not an individual has permission to post said personal information
• Piracy advocation of any kind
• Racist, sexual, hate type defamatory, religious, political, or sexual commentary.
• Multiple forum accounts

Forum Posting Guidelines:

Posts must be on-topic, non-disruptive and relevant to the firefighting community. Post only in a mature and responsible way that contributes to the discussion at hand. Posting relevant information, helpful suggestions and/or constructive criticism is a great way to contribute to the community.

Post in the correct forum and have clear titles for your threads.

Please post in English or provide a translation.

There are moderators and admins who handle these forums with care, do not resort to self-help, instead please utilize the reporting option. Be mature and responsible for yourself and your posts. If you are offended by another member utilize the reporting option. All reported posts will be addressed and dealt with as deemed appropriate by Firehouse.com staff.

Firehouse.com Moderation Process:
Effective immediately, the following moderation process will take effect. User(s) whose posts are determined by Firehouse.com staff to be in violation of any of the rules above will EARN the following reprimand(s) in the moderation process:
1. An initial warning will be issued.
2. A Final Warning will be issued if a user is found to be in violation a second time.
3. A 3-day suspension will be issued if the user continues to break the forum rules.
4. A 45-day suspension will be issued if the user is found to be a habitual rule breaker.
5. Habitual rule breakers that have exhausted all of the above will receive a permanent life-time ban that will be strictly enforced. Reinstatement will not be allowed – there is no appeal process.

Subsequent accounts created in an effort to side-step the rules and moderation process are subject to automatic removal without notice. Firehouse.com reserves the right to expedite the reprimand process for any users as it is deemed necessary. Any user in the moderation process may be required to review and agree to by email the terms and conditions listed above before their account is re-instated (except for those that are banned).

Firehouse.com reserves the right to edit and/or remove any post or member, at any time, for any reason without notice. Firehouse.com also reserves the right to warn, suspend, and/or ban, any member, at any time, for any reason.

Firehouse.com values the active participation we have in our forums. Please ensure your posts are tasteful and tactful. Thank you very much for your cooperation.
See more
See less

Sprinkler system question

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Sprinkler system question

    Hi All. I'm studying the IFSTA Fire inspection and code enforcement 7th edition. On page 375 it covers Controllers for fire pumps. they boost flow to the sprinkler system in areas where the municipal ( or other) water system is not enough.

    My understanding is that the system is under pressure and when a sprinkler head opens, the pressure drops and the fire pump cuts in. The book explains this and goes on to say " The pressure at which the pressure switch is set to start the fire pump must be higher than the pressure in the system." What the??? Is this a typeo, or am I missing something?

    Thanks

  • #2
    GPM,


    Most fire protection systems with automatic fire pumps have two pumps, a jockey pump to maintain system pressure and the fire pump to supply water and pressure. The jockey maintains pressure in the system and prevents the fire pump from coming on for small leaks such as a leaking main drain.

    The jockey and fire pump pressures are set in the controllers as follows:

    The fire pump is churned, meaning it is started with no flow, i.e. hit the start switch. The pressure on the discharge side of the pump is noted, say for example it is 150 psi.

    The jockey pump would be set to come on at about 140 psi and go off at 150 psi.

    The fire pump would be set to come on at 130-135 psi and go off at 150 psi.

    The above assumes the fire protection engineer who designed the fire protection system choose the correct size and pressure of the pump based on the available water supply.


    Hope this helps
    Fire Sprinklers Save Firefighters’ Lives Too!

    Comment


    • #3
      Thanks, I follow what you are saying and I agree. I used to work on domestic water pumps and am familiar with pressure switches. In your case the system pressure is kept at 150 psi by the jockey pump. The book says that the cut in pressure of the fire pump must be higher than the system pressure. That does not make sense. The only thing I figure is that when they refer to system pressure it is the pressure on the suction side coming from the towns system. Let’s say that pressure is 100 PSI and the cut in pressure is set at 80 PSI,( lower than system pressure " from the town") then the pump would not cut in when a sprinkler opened, until the flow reduced the pressure to 80 psi. That’s the only thing that makes sense to that original statement found in the book. Do you agree?

      Comment


      • #4
        Your exactly right. The cut in setting of the fire pump pressure must be set higher than the static water pressure of the city supply. Another common mis conception is that a fire pump is installed on a sprinkler system to boost pressure not flow. If more flow is required than the city can supply, we have to install a storage tank.

        Comment


        • #5
          Thank you, I also e-mailed the editor and confirmed it. He noted my concern on the wording in the text.
          I can't say they will change it, but hey, I did my part.

          Comment

          300x600 Ad Unit (In-View)

          Collapse

          Upper 300x250

          Collapse

          Taboola

          Collapse

          Leader

          Collapse
          Working...
          X