Header Ads

General requirements of Circulation Relief Valve

Circulation Relief Valve

Circulation Relief Valve

Circulation Relief Valve

Definition:

A valve used to cool a pump by discharging a small quantity of water. This valve is separate from and independent of the main relief valve.

General Requirements:

  • Where an electric variable speed pump is installed, the automatic circulation relief valve shall open at the minimum speed.
  • Each pump shall have an automatic relief valve listed for the fire pump service installed and set below the shutoff pressure at minimum expected suction pressure.
  • The valve shall be installed on the discharge side of the pump before the discharge check valve.
  • For multistage multiport pumps, the automatic circulation relief valve shall be installed before the discharge check valve for the last port and set below the churn pressure of the first port.
  • The valve shall provide sufficient water flow to prevent the pump from overheating when operating with no discharge.
  • Provisions shall be made for discharge to a drain.
  • Circulation relief valves shall not be tied in with the packing box or drip rim drains.
  • The automatic relief valve shall have a nominal size of 0.75 in. (19 mm) for pumps with a rated capacity not exceeding 2500 gpm (9462 L/min) and have a nominal size of 1 in. (25 mm) for pumps with a rated capacity of 3000 gpm to 5000 gpm (11,355 L/min to 18,925 L/min).


Note that: Above requirements shall not apply to engine driven pumps for which engine cooling water is taken from the pump discharge.

7 comments:

  1. Thanks for this Article .

    I have Lot of question about Fire Protection Design , Please give me your Mail ID .

    ReplyDelete
    Replies
    1. you are welcome, our email is : info@fps-eg.com

      Delete
  2. This comment has been removed by the author.

    ReplyDelete
  3. This is my first visit to your web journal! We are a group of volunteers and new activities in the same specialty. Website gave us helpful data to work. Gate Valve

    ReplyDelete
  4. I have the following queries.

    1) What would the valve do in the normal working with discharge on.

    2) How does this temperature gradient work in the circulation relief valve.

    ReplyDelete
  5. Positive site, where did u come up with the information on this posting?I have read a few of the articles on your website now, and I really like your style. Thanks a million and please keep up the effective work. world wide news

    ReplyDelete
  6. I honestly appreciate the blog you have posted. Really looking forward to this kind of words.

    ReplyDelete