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  1. #1
    Join Date
    May 2012
    Posts
    132

    Default 1/2 inch pipe size?

    Hi,

    For fear of losing my sanity can somebody explain to me how to correctly size imperial pipework please.

    I'm looking to fit a raw water inlet strainer for my 1GM10. Currently the rubber reinforced hose states 1/2 inch on the sleeve.

    What is the internal diameter / bore therefore. All new plastic water strainers appear to state fits either a 1", 1.25" or 1.5" ?

    Where the hose fits to the water pump this is 1/2" so I'm guessing that I need a water strainer with similar sizing.

    Will a 1/2" reinforced hose (as I have currently) fit to the new water strainer if it's either 1", 1.25" or 1.5" ?

    Thanks.
    Last edited by conks01; 01-10-19 at 19:39.

  2. #2
    Join Date
    Feb 2008
    Location
    Suffolk
    Posts
    3,734

    Default Re: 1/2 inch pipe size?

    Hose is referred to is the internal diameter. Your 1/2" reinforced hose is fine - here is a strainer which has a 1/2" hose connection - https://www.ebay.co.uk/itm/SF-SWF002...AAAOSwqLFdS3r7
    Just found it on ebay - I'm sure other makes are around.

  3. #3
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    21,086

    Default Re: 1/2 inch pipe size?

    It sounds as if you need to buy a 13mm strainer if you want to retain the same hose.

    https://www.asap-supplies.com/brands...ner-140-401863

    Richard
    Last edited by RichardS; 01-10-19 at 21:01.

  4. #4
    Join Date
    May 2012
    Posts
    132

    Default Re: 1/2 inch pipe size?

    Thank you! No longer confused.

  5. #5
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,734

    Default Re: 1/2 inch pipe size?

    Quote Originally Posted by conks01 View Post
    Hi,

    For fear of losing my sanity can somebody explain to me how to correctly size imperial pipework please.

    I'm looking to fit a raw water inlet strainer for my 1GM10. Currently the rubber reinforced hose states 1/2 inch on the sleeve.

    What is the internal diameter / bore therefore. All new plastic water strainers appear to state fits either a 1", 1.25" or 1.5" ?

    Where the hose fits to the water pump this is 1/2" so I'm guessing that I need a water strainer with similar sizing.

    Will a 1/2" reinforced hose (as I have currently) fit to the new water strainer if it's either 1", 1.25" or 1.5" ?

    Thanks.
    As said above the hose size is the bore diameter

    The stepped connections on the strainer in the link are designed to accept 12.7mm ( 1/2") , 15.9 mm ( 5/8") or 19.1mm ( 3/4") bore hose


    The sizes quoted for this tpe of strainer https://www.asap-supplies.com/fittin...mounted-402025 are the BSP ( British standard pipe) thread size of the inlet and outlet and ( in mm) the overall dimensions. (They come in a range of BSP sizes) In this case you would need to match the BSP size of the seacock valve and a hose tail with the same BSP thread but to also fit the hose eg this one with a 1/"2 BSP tapered thread to accept 13mm hose


    Fact of life. When matching hose to fittings is that it come in two sizes Too small and too large

  6. #6
    Join Date
    Nov 2013
    Location
    Perth WA
    Posts
    2,354

    Default Re: 1/2 inch pipe size?

    I don't go by measurement as it is too confusing.

    I take the fitting off the motor (or take the ball valve) to the boat chandlery and go through their shelves until I find a fitting that fits.

    Why Don't My Fittings Fit?
    A brief history of plumbing pipe sizes and how fitting sizes came to be

    https://www.plumbingsupply.com/why-d...tings-fit.html
    Last edited by coopec; 01-10-19 at 23:45.

  7. #7
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,734

    Default Re: 1/2 inch pipe size?

    Quote Originally Posted by coopec View Post
    I don't go by measurement as it is too confusing.

    I take the fitting off the motor (or take the ball valve) to the boat chandlery and go through their shelves until I find a fitting that fits.

    Why Don't My Fittings Fit?
    A brief history of plumbing pipe sizes and how fitting sizes came to be

    https://www.plumbingsupply.com/why-d...tings-fit.html

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