Thread: Hot water supply

I have had the glue joints come apart from just being in the sunlight for a time and the water therein was not really that hot and have put glued joints in very hot water and had them come apart, and I had roughed the surface before gluing both the pipe and the inside surface of the fittings, so I know that they were glued properly.
I have not had really good luck with any plastic pipe or fittings here in Thailand, the quality of the glue is poor and the threaded fittings do not have true NPT threads but more like machine threads that are cut straight instead of tapered like they should be.
And I have had to replace the shielded flexable hose fittings also, I think they are made to sell and not for their service quality.
And I do not have salt in my water as we use harvested roof water and stored in Thai 1500 liter water jars [21 jars in system] so unless there is some salt in the cement jars it should be OK.

Originally Posted by blackgang

And I have had to replace the shielded flexable hose fittings also, I think they are made to sell and not for their service quality.

10" - 80Baht - Made in Thailand - Crap !
10" - 200Baht - Made in US/Italy - Good

Usually you will need a "gender changer" adapter to connect the
flex to the wall outlet. Don't by cheap iron or galvanized ones.
Brass is a bit more expensive but they don't rust or corrode.

Originally Posted by Dougal

A question for DD perhaps.
2) He also has corrosion problems with the flexible pipes used for the last few cms between pipe and sink. He puts this down to the flexible hoses being cheap fakes but I am wondering whether he has salt in his water supply (he has his own bore hole). Or he may be getting a cathodic reaction between the copper pipe and the flexi hose couplings.

Most likely the latter. Galvanic corrosion due to connection between dissimilar metals. Copper has a very high standard potential compared to most other common metals like Iron, Aluminium, Zink etc.

Where does the corrosion appear - on the inside or outside of the pipe?

Originally Posted by Whiteshiva

Where does the corrosion appear - on the inside or outside of the pipe?

I haven't seen an actual example - I will try to get hold of one.

That's odd, I thought those flexible steel pipes had a plastic core?
As for the 'glue', it's a plastic that fills the gap between the surfaces joined, the solvent in it slightly etches the surfaces, but doesn't "weld" them together. A soldered copper joint is much stronger, of course, but as to the question: I don't know whether the blue pipes are suitable for hot water, I mean, how hot is it, how much pressure, one should ask.
There is a yellow pipe available, which is of higher quality than the blue and cheaper than copper, I think, and won't cause any corrosion.

Originally Posted by stroller

There is a yellow pipe available, which is of higher quality than the blue and cheaper than copper, I think, and won't cause any corrosion.

Same quality, different colour. Yellow is used to indicate the pipe carries electrical wiring of high voltage.
The grey pipe, often used for electrical in houses, is actually intended for low voltage like door bells, telephone, intercomm.. Now tell that to the Thai´s..

Originally Posted by stroller

There is a yellow pipe available,

Are you referring to the yellow conduit that the electricians use to run cables in?

Oops, didn't know this is for electric, I used some for making models, the moulding and surface is superior to the blue.