new house or old house not important.
new pipe or old pipe and quality of pipe and workmanship more important.

Make sure developer using poly instead ABS.

I am thinking to install water pump and then change all current PVC pipe to stainless steel.
Not sure how much it will cost...

should be very expensive. I ask my plumber before he say if wanna install pump make sure ABS piping won't shaking.


This post has been edited by petlu28: Feb 20 2014, 03:22 PM

Ya make sense.

poly for the whole house? im not sure

Wah.. You just finish your reno. Now want to hack again?

If your house landed can climb up checking.

question: i am comparing costs at them moment. if i buy a s/s tank + pump i will have to fork out min. 3.5 to 4k incl. installation. has anyone considered (or installed) a pressurised (membrane-type) tank instead (i.e. no need for pump). price for 300 l tank (volume 150l) is around 3k from grundfos and this would allow you (or me) to store the water sealed totally hygenic and with the incoming pressure from syabas (when go better pressure it will also be "stored"). so if low pressure tank will kick in with the better pressure, if no power also no problem and if no water i have the reserve water.

anyone ever thought about it? it seems actually almost cheaper and you only have to check pressure once every two years or so and increase (just like the small tank on the pump). then can last 25+ yrs.

Did you ask how much volume of pressure is stored in the pressurized tank that can last few years? For it to last so long with no electricity I am guessing it need a big and high pressure storage. I am interested in the engineering point of view how such device work without any motor driven, If a tank are pressurized, how can an incoming water fill the tank without motor pumps, unless the inlet water pressure need to be higher than the outlet pressure.

Haven't see such tank before. But for a 150L volume, is not that much. Can be empty very fast.

I only change pipe from PVC to polypipe from meter to kitchen and meter to tangki.
From tangki onwards still PVC.
Within bathroom also changed to Polypipe.

Didnt pass thru living room, all goes up to roof.
that's the disadvantage for future modification. but potential leaking to plaster ceiling.

Seriously anyone how 0.75 horse power pump can create how many bar of pressure?

This post has been edited by sovietmah: Feb 21 2014, 11:20 AM

Not so sure about what you want.

You want to increase the pressure from the syabas. So a tank and pump is need.

But a pressurize tank without a pump is just equal pressure from the syabas. Let said the pressurize tank air side is 30psi. Syabas need to have 30psi or higher to fill up the tank. If syabas only have 20psi, your tank probably can't fill up at all. Since the tank pressure is higher than the syabas.

With a unstable pressure from syabas like night high or morning low, you probably end up almost no reserve water from the pressurize tank.

Ya agreed.
just get a S/S tank and pump and change the pipe too just incase.

basically a pressured tank works with the same principle as the small pressure tank on top of the water tank. there is a membrane inside that seperates air and water and incoming water compresses the air. the tank's pressure can be preset to say 1.5 bar min. as long as syabas provides more than 1.5 bar incoming pressure, the tank will fill up and store the incoming pressure. you dont need a pump in that scenario if you're OK with incoming syabas pressure. for my place, we normally have around 2.4 bar so i could fill the tank with that pressure and enjoy the water.

my problem with the standard solution is that the storage tank is open (air vent) allowing for water contamination in the tank and as a result in the piping system. i dont want that.

so a pressure tank seems like a good idea in that sense. i was just wondering if anyone has used such a setup to hear experience. no i am direct pipe only so if got water-cut i have no water. 150l would be enough to get us through a day hence the thought.

i have considered that (see the other post). unstable pressure or lower pressure than desired can be easily overcome with a one-way valve. that way i can benefit from whatever the maximum pressure is that syabas can provide during the day. in a way the tank would even out such variations.

Don't worry much about the PVC pipe can't take higher pressure. Just install the pump and regulate the pressure. PVC pipe still can take some high pressure.

Let say you just want the shower to be higher pressure to enjoy. While the rest is ok for you. Than run a new pipe to the shower only from the pump. Install a regulator for the rest and straight higher pressure for shower that with new pipe.

Regulator?

yes i also thought about that. however the s/s tank is not sealed properly (or is there one in the market). the lids are flimsy and the airvalve is just open. this will invite germs, bakeria and god knows what. esp. since you bake the tank in the sun it would be a growing spot for unwanted things wouldnt it? or do you know of a better tank - i asked around and essentially they seem all the same.

my piping is redone just recently and is rated 15 bar max pressure. i dont think i will have any issues there at all. its more about which option will be better given hygiene consideration. 2 bar will be enough for my place so i can live with that. pricewise its roughly the same which is why i am wondering what option will be better in the long run.

ct hardware in pj told me about pressure tanks when i raised the hygiene issue. they say hospitals etc. use them but very costly. so have to settle for a smaller size. 500l usable storage is just too costly for me. cant afford that.

The concept work if the incoming pressure are higher than outgoing pressure. The problem will be slow filling up vs filling up un-pressure tank.
150L just right for maybe 2 adult loh, with kids think will be challenging. One bath especially people enjoying 10mins or more bath, already taken 60-70L water.

thanks for the feedback. i also think it might be a tight squeeze if water cut. but for increasing flow etc. should be fine because you still have incoming water to support or will the tank cut me off from syabas while the tanks pressure is above syabas pressure? then you have a very valid point and the setup is not practical.

havent thought much about the slow fill. i agree - might be an issue.