what did u use to draw?

Same as autocad.

@ozak: i yet to show my plumber my sketch (= your drawings with minor modifications ).

In your drawings, there are 3 independent outlets from tank to bathrooms. what if i need to install a pump after tank to bathrooms? Can i straight tap out 1" pipe from tank to pump then, pump outlet 1" branch to 3 nos 3/4" or 1/2" till bathrooms? means, 3 bathrooms having common inlet pipe, is this ok?

if your using a pump should be no problem..

1 connection to each toilet is used when there is no pump and you depend on gravity for the water pressure

From pump 1 inch you should continue to branch to 3 nos 1 inch or at least 3/4 inch, not 1/2 inch until the bend going down the bathrooms you use a reducer from 1 inch or 3/4 inch into 1/2 inch. 1/2 inch with 3 outlets (not inlets) in the bathroom is ok. When you brush your teeth you are not bathing at the same time right. Also toilet will very soon full with pump in few secounds. No problem for bathing. If you use 3/4 or bigger pipe down the walls you still have to reduce the pipe to 1/2 inch at the outlets which is not advisable. Difficult to have big pipe in wall and unneccssary reducers.

ok ar if i am taking a shower in one bathroom and my kid flush toilet in another bathroom?

No problem when you have pump or without pump as the pipe serving all the bathrooms is bigger pipe than the 1/2 inch pipes in the bathroom.

1 inch pipe is 4 times the area/volume of 1/2 inch pipe. 3/4 pipes is 2 x the size of 1/2 inch in flow volume.

As Jinxxx said, no problem.

If use pump, 1" inlet to the pump. Than out from pump can use 1" or bigger. Than branchs out to 3 pipe to 3 bathroom. But smaller size pipe. Smaller size pipe to reduce the cost. And with pump you don't need consent about the pressure because of smaller pipe size. And don't need hack a bigger hole in the wall. 1/2pipe should be good enough from the pump side.

possible to use poly pipe for house interior conceal in wall ?

No problem.

you can... but u need to use those small fittings..

the normal fittings cannot use

i used this fittings when i replaced all my pipings.. http://www.sansico.com.my/products/fittings.html

http://www.sansico.com.my/project-referenc...brick-wall.html

This post has been edited by JinXXX: Apr 22 2012, 11:26 PM

but i heard that termite will attack poly pipe rite....if orange-pvc is used to conceal the poly, does it work ?

*Any tips or ideal to setup high pressure water from tap to hose and nozzle for car wash ? coz once i turn the tap for max flow, the hose always burst out then everything in mass lol

This post has been edited by Pegasus88: Apr 22 2012, 11:36 PM

get a better high quality hose.. that can withstand high pressure.. won't be cheap, eg those branded hoses.. that have proper pressure rating

15 meter about 200 MYR

termite will attack poly pipe as in "eat" it ? unless my bio fail.. they eat wood and not poly so no idea whats your meaning of "attack"

This post has been edited by JinXXX: Apr 23 2012, 08:14 AM

Never heard of termite attack poly pipe. I have my poly pipe underneath soil for 10 yrs and there are garden termite the one with big head and house termite the one attack houses at my garden.

I dont think any animal can eat plastic or poly non-bio degradable things.

+1

Resistance to Bio-degradation and attack

Polyethylene pipe is not known to be subjected to any form of microbiological corrosion. It has excellent resistance to the attack of termites, fungi, insects, or biological agents when it is buried in soil. Polyethylene does not support fungi and even relatively virulent fungi. Polyethylene has been tested for resistance to marine-biological attack and it was found that in their biochemical oxygen demand-type tests, Polyethylene was not utilized by bacteria.

@ozak: just saw your post in another thread, you are installing a pump into your current installation.
Actually for my case, I yet to move into my new house, not sure if the water pressure is low or not. After moved in, if cannot accept the water pressure only will add on pump. How should i lay my piping after tank, to "prepare for future pump installation"? From tank branch out 3 pipes to bathrooms now? Or, from tank branch out 1no 1" pipe then only split to 3 nos 3/4" pipe for 3 bathrooms? Mean, before install pump, all bathrooms sharing common inlet. If so, my bathrooms' water pressure without pump will sure low!??

So, don't "prepare for pump" now, isit? When need pump only ask installer to modify piping on the roof?

When you have pump it does not matter much if you split from 1 inch into 1/2 inch since the pump has enough force to push up the water pressure.

When you have no pump logic tells you that the pressure it has is the height of the tank location to its outlets. It is all about gravity and the pressure is usually low due to the limited height. In such case you got to consider the right size of pipe with below consideration:

1. Water that run flat will be slow as such you need bigger pipe. This is from Tank to each individual bathroom before going down.

2. water that runs down has gravity assist therefore need not have to use big pipe, it doesn't help much or at all.

3. The outlets are 1/2 inch, having bigger than half inch does not help the volume flow for pipe coming down with gravity.

In conclusion the proper sizing is:

1. From tank running flat = 1 inch. 1 inch pipe can support 4 nos of 1/2 inch pipes without suffering lost of pressure.
2. From roof to bathroom = 1/2 inch

Note: Area of circle = PI R square.
1 inch pipe area = (22/7*1/2)x(22/7*1/2)=2.47sq"
1/2 inch pipe area =0.617sq"
2.47/0.617=4

This post has been edited by stevie8: Apr 23 2012, 11:11 AM

fuuuuuuu

From my experience, ABS pipes much much versatile and if installed correctly will be in service for many2 years compared to pvc pipe or any other types. ABS pipes expecially its fittings is crucial that one get the same brand. So the fit is exact. Cutting of the ABS also have their specific tools, unlike pvc where any hacksaw can be used to cut the pipes. Then comes the ABS cleaner and glue. The glue part can buy any brand no hal, but the clener specific one for ABS, very important. Workers nowadays not like old school workers, they dont have any pride in doing construction, so if can curi tulang, ular, most of he time, the area to be mated are not properly cleaned. So disaster.

For using pumps in the system, best is Groundfos pumps as they are leaders in this field. If using ABS, maximum I would recommend in 2.1 bar. The nominal range for household around 1.2 to 1.6 bar.

For internal house water tank, the best is actually poly tank. Comes in many shapes and sizes. Light, cheap, easy to service and maintain. Only setback is that every few years must perform full internal cleaning to get rid of the blue algae.

blue algae ? i thought cleaning it is to remove the dirt/mud and sorts but not algae..