Pipe work

[Bobobolinsky]

Hi I'm fitting my water system and new diesel heater

I'm going for Pex/Hep2o piping My intention is to fit the Pex with ferrules and standard compression fittings, rather than quick fix fittings. I had heard that over a period of time, the QF fittings corrode on the teeth and the fitting comes loose and leaks. Is this anecdotal, or has anyone had experience of this? Obviously Eberspacher now favour Hep2o, so should I use the compression fittings or QF.
Although QF fittings are more expensive than compression fittings, they are much quicker to fit, which is an advantage if I want to get in the water this summer

 

[maxi77]

I have some of that type of pipework for an outside tap at home, if I forget to drain it in winter it fails at a quickfit coupling not a compression coupling so I would suppose the compression is more reliable.

 

[pete]

After using copper piping in my job for the last 40 years I am not to keen on the plastic pipe replacements but do agree that in some situations it can be handy. On the odd occasions that I have used plastic pipe I have used compression fittings with inserts. tighten them up and the olive grips the plastic no problem.
Just a question how big is your boat ? It must be massive if the time difference between using compression or push fit fittings is going to matter

Pete

 

[Giblets]

The grab rings on the plastic fittings are stainless steel so very unlikely to corrode. I have never had a fitting fail from this cause only from user interface error (I.e. not pushing the pipe far enough into the fitting ). You will need to use the support sleeves with the fittings though. Longer ones are used with compression fittings.

 

[Deleted member 36384]

Support the plastic pipe well, I have had a section wear through from abrasion.

My own system is a mix of copper and plastic pipe with pushfit couplings. The copper pipe split at a low point that last bitter winter we had, the low point of the plastic pipe did not. Replacing the copper sections with pushfit was very easy, so I would go for pushfit.

 

[PCUK]

The 27 year old HEp2o on my boat never leaked or corroded. It also never split due to freezing.

 

[Bobobolinsky]

I have previously had a barb joint fail on a water system (underneath a customers bed ) Now I have never heard of a fitting blowing off a pipe like that, but on a scale, I would rather have a pipe fitting blow off, than have to replace a section of tube, Hopefully my doghouse won't get that cold

I guess it is going to be more likely that I won't be able to find the longer ferrules/pipe reinforcements. It seems that John guest SF and Hep2o have dropped considerably in price, so it looks like a Speedfit job

Thanks for the answers guys