Many people have been asking PBA on its FB page: how can 2 x 600mm pipes replace a 1350mm pipe, capacity wise?

PBA: krik krik krik

It cant, due to the time constraint this close to 2mil project is a temporary mitigation but atleast this one can last longer but ofcourse the the combined volume is smaller than the initial one but the existing pipe really cannot tahan already so have to go for this.

Understand. Any plan to add to this capacity while waiting for the like-for-like replacement?

For example, install a manifold and run HDPE pipes to supplement the 2 x 600mm? I understand hdpe pipes are relatively easier to install.

you need to square it

area of 2x600 mm is less than half of 1x1350 mm

you can increase the flow rate by upping the pressure, but got limit also or the pipe will pecah again

Pressure need to increase with the faster flow rate, they cannot just keep on increasing pumping pressure and flow rate. Most likely will need to reduce a bit of pumping pressure if they do not want the new smaller pipes to burst too.

just a random figure i googled



edit:
from the picture, take for example 40 psi,
big pipe ~230 gpm
2xsmall pipe ~2 x 50 gpm

if you want to maintain the flow rate at 2 x 100 gpm, the pressure in the smaller pipes would go > 100 psi.

so yeah, most likely they will need to reduce the pressure a bit.

in practice, the frictional losses would also reduce some of it.

Better you escape to Taiping.
This piping works not like playing Lego, so easily fixed.