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  1. #1
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    Default What is size of the tank to pump valve?

    What are the different sizes of the tank to pump valve for the different size pumps?

    1250 and 1750 and 2000 gpm pumps


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    Forum Member CaptOldTimer's Avatar
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    Quote Originally Posted by Griffiemon View Post
    What are the different sizes of the tank to pump valve for the different size pumps?

    1250 and 1750 and 2000 gpm pumps


    It is probably a 3-1/2" for all
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    Forum Member FIREMECH1's Avatar
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    I've seen 3" or 4" valves on any combination of the above pump ratings.

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    The NFPA sets a performace standard based on pump size, rather than a minimum measurement in diameter.

    IIRC, it's 250 GPM for pumps rated less than 750. 500 GPM for pumps rated 750 or more.

    Most Hale pumps use a 3" line, 4" is optional, and Hale rates a 4" T2P @ 1,100 GPM.

    I think most Waterous pumps use a 3Ĺ".
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    All of ours are 3" lines.

    That being said, my last department began ordering all thier pumpers with dual 3" tank to pump lines about 12 years ago.

    Plus was more water to the deck gun. Biggest minues was they were a lot toughter to open as the opened as a unit.

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    On 1000gpm+ pumps, I've seen several different configurations. A pair if individually controlled 2 1/2-inch, single and double 3-inch, single 3.5-inch, single and 4-inch.

    Unless you spec differently, Waterous will likely install one of their 3.5-inch valves.

    I lean towards the single valve as it cuts your maintenance and failure potential by 50 percent.

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    Quote Originally Posted by LaFireEducator View Post
    All of ours are 3" lines.

    That being said, my last department began ordering all thier pumpers with dual 3" tank to pump lines about 12 years ago.

    Plus was more water to the deck gun. Biggest minues was they were a lot toughter to open as the opened as a unit.
    I recall that when we spec'd our '68 Hahn, we called for two 2-1/2" (common size in those days) tank to pump lines. Both were piped from the bottom of the tank, one from the front and one from the back. Each had its own valve. The idea was if you were on a steep hill (you don't have them where you are), you pulled the lowest one and got full capacity of the tank. In pretty short order we discovered how much more flow you could get by opening both when you were on reasonably level ground.

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    Quote Originally Posted by LaFireEducator View Post
    All of ours are 3" lines.

    That being said, my last department began ordering all thier pumpers with dual 3" tank to pump lines about 12 years ago.

    Plus was more water to the deck gun. Biggest minues was they were a lot toughter to open as the opened as a unit.
    How big of a tank are you using? Are you running you deck just off tank water?

  9. #9
    Forum Member Engine305's Avatar
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    Default Tank to pump

    When my old company specc'd a tanker pumper back in 1987, the requirement was for the tank be filled at 1000 gallons per minute, dump off at least at 1000 gpm and be able to pump off from its own tank at 1000 gpm. So; we got a Newton Dump valve, 1000 gpm LDM Darley pump with 2 - 3 inch tank to pump lines that opened in series all the time with an air valve. And 2 - 3inch gated rear intakes with Storz fittings. And thatats exactly what it does even to this day. The first S & S Mack in New Jersey back in 1987.

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    Quote Originally Posted by rm1524 View Post
    How big of a tank are you using? Are you running you deck just off tank water?

    We were running 1000g tanks. The Chief wanted to be able to flow the full 1200gpm off the deck gun for an initial 30-second hit.

    As I recall, we have only used this type of a blitz attack once or twice, but it has been effective when used.

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    Quote Originally Posted by LaFireEducator View Post
    We were running 1000g tanks. The Chief wanted to be able to flow the full 1200gpm off the deck gun for an initial 30-second hit.

    As I recall, we have only used this type of a blitz attack once or twice, but it has been effective when used.
    I can see the concept of that, but without a water supply established it would be real easy to run out of water.

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    Quote Originally Posted by rm1524 View Post
    I can see the concept of that, but without a water supply established it would be real easy to run out of water.
    Either you put out a fire requiring a 1200 gpm fireflow with 1200 gpm or you flow 150 gallons of minute for 6 minutes and then run out of water and wait for your water supply. Either way, if the fire was not put out you found out 5 minutes sooner with less manpower using the deck gun.

    If you could not put it out flowing 1200gpm you would never do it flowing 150gpm. Hence the "blitz attack".

    Our department has consistently used 2- 3" tank to pump valves (one with a check valve), one plumbed to the front of the tank and one to the rear of the tank for a long time.

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    Idea is to knock the large volume of fire down until your support arrives. Used a LOT in my area with good result. T.C.

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    Default 4"

    We went with a 4" pump to tank on on pumper-tanker. Allows us to do a blitz attack from tank for quick knock down or pump off using ldh for nurse operations when you can't setup a dump tank.

    On the other hand - go with a 2.5" and only pull a ride line - you will never run out of water.... but not save much property.

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    Quote Originally Posted by rm1524 View Post
    I can see the concept of that, but without a water supply established it would be real easy to run out of water.
    If you DON'T hit it hard and fast,you're gonna run out of building and the supply becomes a mute point. Our second due is usually about 2-3 minutes behind the 1st out. Everything we run(minus the Ladder) has 1000 plus on it. We've used the approach on numerous occasions with good results. T.C.

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    Our first out pumper/tanker is 2500 gallons and has a Hale QMax 1500 GPM pump. I speced it with a single 4" T2P. Has worked out pretty well so far on blitz attacks, etc.
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    We would usually get 3-5 engines out of our 3 stations within the first 3 minutes, as well as at least 1 auto-dispatched mutual aid engine and often 2, so a 2nd engine showing up within 2 minutes of the first-due was a pretty common occurance.

    In a lot of places in town, the first due could also lay in a supply line from the engine while we were hitting it with the deck gun.

    My current department rarely uses the deck gun, and to my knowledge, hasn't used it for an intiail blitz attack in the almost 8 years I have been here.

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