Commercial waste pipe.

[ShaunCorbs]

ideally 110mm but you will get some putting it in 50mm its the length thats the issue

 

[rpm]

If wash basin as in washing hands then where is the grease coming from as it shouldn`t be from the prep sink. Dishwashers anywhere?

 

[SJB060685]

This is what I was wondering rpm, the majority of fat was in a place only one of the wash basins was discharging through.

 

[rpm]

There was a large cafe in Oxford who had problems with grease building up over time so they had a connection at the start of the outlet pipe where once a month they hooked up a pressure jet washer and cleaned the pipe out because there was no room to install a grease trap. Crude but effective.

 

[SJB060685]

Unfortunately there isn’t really enough room to install a grease trap, despite the need. I will report back to him with all this information. Creating a cleaning port might be the only option for now

 

[king of pipes]

30 - 40m is crazy it will always block up even 50mm branches into a 110mm soil run that length will eventually have issues . kop

 

[SJB060685]

My concern is one wash basin is on a branch of about 15-20m, from what I’ve read this is way too long?

 

[king of pipes]

Way to long but it is what it is plenty of
rodding access points and the knowledge that from time to time there will be issues , or you address the problem and make major alterations to the drainage . Kop

 

[chris watkins]

My concern is one wash basin is on a branch of about 15-20m, from what I’ve read this is way too long?

Errr... if it is vented nothing is too long, just stop & think about it, 100mm below ground drains runs are often much longer.

What about using 75/82mm pipe if you think 50mm is to small?
It is all about how often the appliances discharge, for how long & what they are. The pipe shouldn't run more than 3/4 full but equally it needs to have, & maintain, a self cleaning velocity.
As the Romans found when building the grand aqueduct to feed Rome, not much new in this world !!

 

[Chuck]

they had a connection at the start of the outlet pipe where once a month they hooked up a pressure jet washer and cleaned the pipe out

Ah, yes... The old, "push it downstream and make it someone else's problem" approach...