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Thread: Insulating ref piping

  1. #1
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    Insulating ref piping

    For some weird reason I enjoy insulating haha. Nothing special but I really appreciate how much better mitered fittings work rather than just sliding it over, where it can pinch and ice up on freezer suction lines. I didnt do the liquid line, I was just fixing the suction.




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  2. #2
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    That is a thing of beauty! That is definitely the right way to do it, but few people have the patience (or a sharp enough knife) to accomplish anything close to being that nice.

    If I were to try something like that I would probably end up with glue all over myself and it would end up looking like an abortion.

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  4. #3
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    What kind of knife do you use? It blows my mind how quickly cutting armaflex dulls standard razor knife blades..


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  6. #4
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    I use a “kerf saw” with very fine teeth. At first it didn’t seem like the best tool for the job, but after trying various smooth blade knifes unsuccessfully, I gravitated back towards the saw.


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  7. #5
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    Very nice. You'd of gone thru 2 packages of razor blades to make all those cuts
    Officially, Down for the count

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  9. #6
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    Just split it and use a good lineset tape and tape it completely.

  10. #7
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    Quote Originally Posted by Adlerberts-Protege View Post
    Just split it and use a good lineset tape and tape it completely.
    What's lineset tape? OK, I just looked it up. I've been looking for something like this for several years, I never knew it existed. I have been using black duct tape, but that stuff sucks. I'm going to get me some real lineset tape now. Thanks AP.

    Note... I'm not saying this lineset tape could in any way be a replacement for the method that GoCougs uses, but I can see where the tape could have it's place.



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  11. #8
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    Quote Originally Posted by Adlerberts-Protege View Post
    Just split it and use a good lineset tape and tape it completely.
    On freezer suction lines, it is not good to have much tape on the outside of the insulation, the insulation can’t breathe properly and can become waterlogged and drip during defrost.

  12. #9
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    How does closed cell insulation “breath”?


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  13. #10
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    Quote Originally Posted by coolerik View Post
    How does closed cell insulation “breath”?


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    Good question. It’s what I was taught, and frost is an issue on lines with too much tape. But there is a strong possibility that I am wrong as well!

  14. #11
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    I doubt it’s about breathing, mabey the tape is on to tight squishing the insulation and ruining its R value.. or just not thick enough?


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  15. #12
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    Insulating ref piping

    Quote Originally Posted by Adlerberts-Protege View Post
    Just split it and use a good lineset tape and tape it completely.
    Thats a big emotional negatory for me

    The stuff I tore off had a combination or poor glueing techniques and black duct tape over that. Once water gets between the insulation and the pipe its going downhill from there. The armaflex manual says that if you want you can put a wrap of tape around the joints after theyve been properly glued. Theres no way taping it will make the airtight seal you need.

    Armacell even recommends glueing the insulation to the pipe at intervals, so that if a section gets infiltrated it doesn’t ruin everything.

    Tape might be a great solution for resi AC but no way in commercial refrigeration.


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  17. #13
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    That is some seriously impressive insulation work!

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  19. #14
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    Quote Originally Posted by GoCougs View Post


    I use a “kerf saw” with very fine teeth. At first it didn’t seem like the best tool for the job, but after trying various smooth blade knifes unsuccessfully, I gravitated back towards the saw.


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    How many teeth per inch is that one? I just found a 42 TPI version that looks like it's the same brand as the one you pictured.

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  20. #15
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    Quote Originally Posted by shellkamp View Post
    How many teeth per inch is that one? I just found a 42 TPI version that looks like it's the same brand as the one you pictured.

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    Yep I believe its 42


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  21. #16
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    Quote Originally Posted by GoCougs View Post
    Yep I believe its 42


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    Awesome. Just ordered it, thanks.

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  23. #17
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    Whoa, didn't expect to see what I saw in the OP.

    How much time did it take to do just what is in the photo?
    I do a triple evac with nitro to remove non condensables.

  24. #18
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    Insulating ref piping

    Quote Originally Posted by BBeerme View Post
    Whoa, didn't expect to see what I saw in the OP.

    How much time did it take to do just what is in the photo?
    Takes probably 3 minutes or so to make the fitting, so for a trap that 9 minutes, then another couple to properly glue them together, and another couple to fit of the pipe and glue the seam. So the trap and the tee was probably 15-20 minutes. Certainly not the quickest way.


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  25. #19
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    I've always tried to do the best I could when insulating. It does take dedication and attention to make it decent.

    And you sir, have done very well. Just the lack of glue showing is a skill in and of itself !!


    Quote Originally Posted by GoCougs View Post
    Takes probably 3 minutes or so to make the fitting, so for a trap that 9 minutes, then another couple to properly glue them together, and another couple to fit of the pipe and glue the seam. So the trap and the tee was probably 15-20 minutes. Certainly not the quickest way.


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    I do a triple evac with nitro to remove non condensables.

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  27. #20
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    I like how you piped in that tee.. after the trap, yet still fully functional.. I probably would have tried to tie in before the trap somehow, only complicating things.. good job! True fridge mechanic work!


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