and... where does this "Acid" come from ?

your using ABS piping for potable water or industrial use ?

Just bear in mind, PVC pipe joints are not capable to handling internal water pump, which many are installing these days. The pipe isn't the problem, the joints are.

SO what is the best for main pipe? SPecially underground from the water meter to the kicthen?

I thought PVC has no problem with UV or the sun but not heat. Heated it melt like icecream. Infact PVC is the best plastic against UV.

ABS plastic will melt with sulpheric acid but ABS is very strong and unlike PVC heat is not a problem but of course you dont use it for hot water piping. ABS can take load and use underground and withstand weight and pressure. ABS is the pipe you must not expose to sun/VU it will disintegrate.

If you need a strong pressure cold pipe use ABS for pump in the wall for example. PVC class 7 will reduce volume flow due to its very thick layer. You dont use stainless steel or copper pipe for cold pipe it is very expensive, not only the pipe the joints as well many times over the price of PVC and ABS.

For meter main going underground to house use poly as it is flexible you can bend and turn around it and there is no joint. For underground never have any joints there. It should be one long pipe from meter to the other end surface up. You will never have problem leaking underground. From there you either use PVC or ABS for internal distribution. If you use PVC or ABS for underground you got to connect and when there are joints there are future troble. Same goes for S steel and copper not only it is expensive you cannot have long pipe but need to join. Joining is always no no no for areas you cannot access.

Use stainless steel joints at the end pipe (example) from wall outlets to connect to your taps, toilets, basin, etc. Becasue these "heads"at one time or other you need to replace the taps and to unscrew or rescrew on PVC and ASB you could use too much force and break the thread.

Copper is easy to install and connect and to disconnect and yet cheaper than stainless steel for hot water supply. But never step on it or bend it walking over. It shouild be on roof top or wall.

You don't need 2 pipes for your kitchen inorder to backup incase no water. For my home, I install a bypass pipe from the water tank to the water supply pipe for the tank. In the middle of the pipe, instal a check vavle. Than install another check vavle at your meter outside.

When no water come, the water tank pressure is greater than supply. Plus the gravity, the water will flow back to the main pipe. And your whole house have water from your tank include your kitchen. Even you can wash your car. 

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Added on February 24, 2012, 9:39 am
Sound like a best choice to use this material for the main pipe. Second to stainless steal.

I have 2 water tank and all my bathroom is connect to the tank. So the water is always moving and no statik. While the kitchen and the garden is main.

The kicthen only have 1 tap. Either the water from the main or tank if no water. If the water pressure is low, than I know there is no water from the main. Cause pressure from the tank sure is lower than the main.

When the main have water, it will shut off the vavle from the water tank. Cause the main pressure is greater than the tank. The whole auto system is using the pressure to run.

Your way of piping save one piping and the best is it is auto no need to shut off main supply to have tank supply. But dont you have problem with low pressure with one way valves and the valves after some time like 3 to 5 years get jammed and need replacement?

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Added on February 24, 2012, 1:07 pm
No problem changing "syabas" pipe outside before meter. Syabas shoiuld have replace all the GI pipes that cause dirty rusty water. When there is no water supply and when supply resume all the rust will be flush out into our house that is why we need whole house filter.

You should choose other than the sand rocket filter. Somehow the tiny sand will get into your house piping, into water tank, heater tank, blocking taps, etc. I replaced my sand filter with simply cheap acrylic filters for the whole house.

Hi Jin,

We are out of topic. Anyway a promise is a promise, see pix below
[attachmentid=2703228]click pix 1 to see waterflow direction on the pix
[attachmentid=2703254]

From the pix you can see there suppose to have 3 filters but I cut off one. 2 is enough. I also have a pressure meter installed to check water pressure how much it drop when turned on taps in the house. usually drop less than 10psi from 40 to 35 or from 60 to 55.

The filter is 3/4 inch pipe female, to connect it to the flexible hose I use a reducer to 1/2 inch male. The reason I use this type of stainless steel flexible hose is because the diameter is as big as the copper tube and will have better flow if I were to use the normal cheaper flexible hose. Look at the pix below and compare.
[attachmentid=2703242][attachmentid=2703246]
[attachmentid=2703248][attachmentid=2703250]

@stevie8 , thanks

back to the ABS piping.. euratech piping says usually ABS pipe is used for chemicals and etc eg acids and all

@tomjason , your abs pipe is what rating or specifications one ?

link tak jalan ah ?

if the joints are properly done won't leak one...

i see the sockets didnt put SS sockets later if next time u change don't over tighten else the abs threads will kena makan

socket standard is all 1/2 inch unless need special reason to use big one eg connect to tank.. connect to pump connect o main valve..

3/4 inch pipe hmm usually the main one is 3/4 and the branch off is 1/2 inch only..

why your plumber choose abs and not poly or upvc or pvc ? his reasoning is ?

Would the ABS overkill for bathroom or others low pressure tap? I guess PVC cheaper than ABS right?

How you tiles the wall when the pipe not inside the brick?

But if you got hot water, from 3/4 to half in you got to wait 2 time longer for hot water to come out, waste a lot of water.

Main from meter is 3/4 inch pipe and at the meter it is 1/2 inch. No point having 1 1/4 then to 2 inch it wont increase pressure, waste big pipe and joints of big pipe is more expensive and dig deeper to tanam. It sholuld be 3/4 inch all the way till it branch out to every outlet point and 1 inch to pump and from pump you can use 1 inch and branch out to half inch to every outlet or from tank you can use big pipe since the pressure is low.

so your land got 2 houses la.. is it ? kampung house or what.. why so nice can have 2 side by side one ?