Brown Stains in Tubing

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bmanson25
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Re: Brown Stains in Tubing

Postby bmanson25 » Sun Apr 05, 2015 11:57 am

Yesterday I used some gallon jugs and using a setup with a pump and some tubing, flushed out my radiators and blocks with a solution of vinegar and distilled water (about 2 Tsp vinegar per gallon) and then followed with a distilled water rinse. I also flushed by tank but just used the installed pumps to cycle the solutions. It was a lot easier than I thought it would be actually (I do love those QDCs, makes it so much easier and less messy). Some little specks of stuff were in the bottom of the vinegar rinse jug and a good blue color from residual coolant that was in them, nothing substantial thankfully. I replaced some lengths of tubing with fresh ones from the same batch I used originally to see if the issue persists.

When replacing the tubing I got a camera and took some pictures and placed the images below. The brown color appears to be stained right into the tubing, some dark brown "gunk" did come out with a swab but the overall tint of the tubing wasn't significantly changed when this was swabbed. I was suspecting a possible contamination or corrosion issue with the fittings or the blocks themselves as this tint was most prevalent right after the fittings, but then I suppose exiting a fitting introduces turbulence int he flow that may also be the reason for this difference. I did take a look at the fittings and saw no evidence of corrosion in areas I could easily see. The stains may just be the porous PVC picking up whatever is in my system (like Tupperware and tomato sauce stains).

Still a little stumped over the exact source but not all that alarmed for now, I think your initial indication of it possibly being plasticizer from the tubing is the strongest theory. I'll keep an eye on things and see how they go for now.

Izerous,

Is there a particular type or brand of tubing you have found to be most stable with regard to releasing "gunk" such as plastisizers and so forth? I'd like to find something to change it out to next time that will remain clear and clean for the long run.

Thanks a lot for all this help and feedback in the thread here. I really appreciate it! :D



Some images:

Tubes 1 and 2 removed:
http://i.imgur.com/WcDVqVc.jpg
http://i.imgur.com/CFdPJoo.jpg

Tubes 1 and 2 rinsed:
http://i.imgur.com/aFxb6jA.jpg
http://i.imgur.com/uoaBAi4.jpg

Tunes 1 and 2 swabbed:
http://i.imgur.com/LVK1o2s.jpg
http://i.imgur.com/wmCzm3s.jpg

The swab:
http://i.imgur.com/TlNtldq.jpg

The fittings:
http://i.imgur.com/ifTIDKF.jpg
http://i.imgur.com/CjdDI9N.jpg
http://i.imgur.com/v0S5TQc.jpg
RP-452X2+(PMP-450x2) > HX-CU1020V > CPU-380I > HX-CU420V > VID-NX980 > VID-NX980 > NS-FM18D > return (@ 1.9 L/m)

bmanson25
Water Pistol Grunt
Water Pistol Grunt
Posts: 9
Joined: Sat Jul 12, 2014 8:29 am
Location: Seattle, WA
Contact:

Re: Brown Stains in Tubing

Postby bmanson25 » Sat Jul 25, 2015 8:31 am

For a quick follow-up on this thread in case anyone finds it with a similar problem as the one I encountered:

Another 4 months since I last touched my system, when I last altered it I did a flush as recommended by Izerous and also changed my tubing to "PremoChill, PremoFlex Clear". There is no significant discoloration in my tubing today, looks great and I'm so happy to not be worrying about my system having issues.

Not sure if it was the new tubing or the flush unfortunately since I changed two things at once but glad the problem is gone. Thank you, Izerous for the advice. Tackling the two issues you mentioned was easy and did the trick!

-B
RP-452X2+(PMP-450x2) > HX-CU1020V > CPU-380I > HX-CU420V > VID-NX980 > VID-NX980 > NS-FM18D > return (@ 1.9 L/m)


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