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Thread: Natural Gas-line upgrade and Maxitrol Regulators

  1. #1
    DIY Junior Member Katholic's Avatar
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    Jan 2012

    Default Natural Gas-line upgrade and Maxitrol Regulators

    Had Gas Company upgraded 250 meter to 425 Al (550,000 btu's) and increased system pressure to 2 psi. Originally installed 1" Sch.40 1" pipe runs 30 feet "after" gas company's regulator tied to 3/4" riser (outside) to Trane Executive Series furnace requiring 162,000 btu's, and Whirlpool water-heater requiring 40,000 btu's sitting sits 3' apart; both are connects to main Sch.40 via Tee and a 3 foot section of 1" Sch.40 feeding 2 seprate 5 foot sections of 1/2" galvanized piping with regulators prior to entering appliance (Maxitrol 325-5AL for furnace & 325-3L for water-heater. Main (Sch.40) has been extended additional 40 feet for a grand total of 70' via installation of union, a cut-off valve after the union, and a third Maxitrol (325-5AL) at 20kw generator requiring 293,000 btu's. Question: As layed out, will system provide 495,000 btu load, providing 5-7" water column for generator, as well as accomodate a gas fireplace at a later time?

    The latter question is asked, inpart, as I stand confused about the following: Maxitrol's 325-AL regulator specs reads 7-11 water-column and requirement for Generac generator is 4-7" water column; Does regulator specs mean to infer that it ships from factory set to automatically output the lower measurement (7) but, really can be field adjusted to out put the maximum (11 water column)? Moreover, I did not observe plumber fiddling with regulator to make any such adjustment.

    Last edited by Katholic; 01-19-2012 at 01:59 PM. Reason: Corrections

  2. #2
    In the Trades Tom Sawyer's Avatar
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    Nov 2010


    Does everything work ok? the 7-11 is it's range. In other words the regulator will drop pressure to that range. Pinpoint accuracy is not practical for cost reasons
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    Join Date
    Jan 2010
    Blog Entries


    Your 2lb system with 70' of 1" iron pipe will run around 2 million BTU's.

    I went to maxitrols website and sized your regulator and according to their sizing and selection program it calls for a 1" 325-5al regulator. The installer should have took pressure readings with the unit in standby mode and the unit running at Max BTU's.

    Call maxitrol and verify the application of the regulator. Its just a phone call and its free.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona


    that regulator is not the appliance regulator. It reduces the medium pressure to low pressure. The equipment's regulator will stabilize it a the specified value.
    Licensed residential and commercial plumber

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