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  1. #1
    Member Rank = Sansai Mannh85's Avatar
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    How to get straight angles when solvent welding?

    Morning guys,

    So, does anyone have any tips on getting your solvent weld bends straight when gluing? I'm namely after tips when doing the bottom drain, I will have a straight length out of the drain and then a 4" swept 90 on the other end going to above ground, my concern is getting the swept 90 as vertically straight as possible? I know to mark the connection with a pen, but I find there isn't really much time to be faffing with lining up the pen marks before the thing goes rock hard!

    Anyone have any good tips or ticks they would like to share?




  2. #2
    Member Rank = Sansai pfrosty's Avatar
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    Use plenty of glue both on the pipe and the fitting socket. This seems to give you a bit more time to make a final twist adjustment.
    It also helps to have 2 people doing it as one can push while the other lines it up and makes the final adjustment
    I struggled with mine at first but its something that you get the hang of the more you do

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  4. #3
    Extreme Koi Member Rank = Gosai phil45's Avatar
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    dry fit and a pencil mark as a reference when glueing

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  6. #4
    Member Rank = Sansai Mannh85's Avatar
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    Quote Originally Posted by pfrosty View Post
    Use plenty of glue both on the pipe and the fitting socket. This seems to give you a bit more time to make a final twist adjustment.
    It also helps to have 2 people doing it as one can push while the other lines it up and makes the final adjustment
    I struggled with mine at first but its something that you get the hang of the more you do
    Thanks for the advice - I did wonder about putting more glue on to give a little extra time so I'll definitely bare that in mind.

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  8. #5
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    also put a good chamfer on the pipe,
    it helps prevent it pushing glue out on one side of the joint,
    and then jamming half way in, as the thinner edge quickly sets.

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  10. #6
    I agree that chamfering pipes, especially large diameter pipes is essential to stop them ploughing into one side of the fitting and sticking half way as you make the joint.

    Where you have a swept bend or elbow that has to be perfectly aligned, either permanently glue or temporarily push the next straight piece of pipe into it before applying the glue to the joint you're about to make then, when you push it onto its pipe, you have the next piece in place to help you line up the fitting correctly and it also helps as a lever to adjust the joint before it sets. If you use this method, make sure you only push on the fitting as you make the joint and NOT the second piece of pipe because this will make ploughing more likely.

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  12. #7
    Member Rank = Sansai Mannh85's Avatar
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    Thanks guys for all the advice, I feel a bit more confident now in my approach, its a bit daunting with the big 4" pipe and 4" fittings!

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  14. #8
    Moderator Rank = Supreme Champion Feline's Avatar
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    When I did mine, I glued the horizontal pipe into the BD first. Then I glued the vertical piece into the swept 90. Then I let them set for a bit.

    Finally I did a dry fit of the 2 pieces with the BD on a flat surface and used a spirit level to get the vertical pipe vertical, and marked both pieces with a sharpie.

    I would strongly recommend when you put the 2 parts together with the glue don’t twist at all but push it straight on, just in case it sets before you have the chance to twist it fully into position. I used 2 people, each has a pot of solvent weld and applicator and pastes up one side of the joint so it can be done faster. Put on plenty of solvent so it’s nice and slippery.

    You will probably have at least one argument at some stage through this process

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  16. #9
    Don't forget to use solvent cleaner. Some people think it's optional and only necessary to clean dirty pipe and fittings but it's badly named. It should be called "surface preparer" because it softens and prepares the surfaces so the solvent cement penetrates into both surfaces and fuses the pipe and fitting to make a good joint that will never leak.

    To make a solvent a joint, either wear rubber gloves (Marigold type) and use a hard tissue (hand drying type not kitchen tissue) or use the brush applicator to liberally coat both surfaces then, without waiting for it to begin drying, quickly apply the glue and push the pipe and fitting together.

    A tip to avoid the solvent cleaner running everywhere and marking the surfaces, tilt the pipe and fitting slightly downwards when applying it so that any drips only drip onto the ground.

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  18. #10
    Quote Originally Posted by Feline View Post
    When I did mine, I glued the horizontal pipe into the BD first. Then I glued the vertical piece into the swept 90. Then I let them set for a bit.

    Finally I did a dry fit of the 2 pieces with the BD on a flat surface and used a spirit level to get the vertical pipe vertical, and marked both pieces with a sharpie.

    I would strongly recommend when you put the 2 parts together with the glue don’t twist at all but push it straight on, just in case it sets before you have the chance to twist it fully into position. I used 2 people, each has a pot of solvent weld and applicator and pastes up one side of the joint so it can be done faster. Put on plenty of solvent so it’s nice and slippery.

    You will probably have at least one argument at some stage through this process
    Not from me you won't!!

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