Hi all, I've recently ran into a problem with one of my loops. The inlet tube to a Koolance RP-452X2 (with D5 pump) seems to have collapsed under the negative pressure of one of the pumps (the other loop is fine):
It's a little hard to see but the spring ring at the bottom is what the tube diameter should look like. You can kind of see at the top that the tube has completely buckled and my flow became low enough that the alarm went off. It's worth mentioning that this is the right side loop of a rev.1 RP-452X2 that I have had since early 2011 however I didn't receive the free bleed pipe kit so that's not installed (I did contact Koolance via PM on these forums regarding it, I really should have chased that up). This problem happened straight after trying to bleed it for the first time in a long time but it could have been building up to it for years.
So anyway some advice please, what do you think is the best course of action to prevent this? I looked at some negative pressure resistant tubes (the ones reinforced with helix wire) but it's hard to find them with 10mm inner diameter that match my fittings. The alternative is to change my fittings and get thicker walled tubing. Would that do it or is there an underlying problem I need to fix. Would simply replacing the tubing like for like then getting the bleeding pipe kit for the RP-452X2 mean that it is less likely to happen in future?
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