Commercial waste pipe.

[SJB060685]

Hi guys.

As some of you here know I don’t do plumbing work, 99% of my knowledge lies within oil fired heating so forgive me if this is a stupid question.

I had to attend a commercial property today (close friends family run business). Complaint was wash basin wasn’t draining water away, easy enough, a blockage somewhere. There were no inspection ports for de-blocking etc etc on a 25m ish run and after making a couple cuts into waste pipe we found that the 40mm was severely blocked with grease and fat in several places. Anyway we’ve cleared what we can and had to redo some pipework as a couple swept tees had broken which we didn’t discover till half way through.

My question is this, as it’s a commercial property what are the minimum waste sizes required for removal of water? In a house you have your standard 32mm and 40mm, this 25m run was 40mm and picked up several other waste connections along the way before discharging outside. With the amount of crap we found inside these pipes it made me think that larger waste pipes would not only get rid of the water quicker but more importantly not block up so quick. There was also a unit inline which slowly administered an anti grease forming solution, however this is clearly having no affect.

 

[Burger]

I’m not sure it differs on commercial. I haven’t read the document, but have you tried this?

Approved Document H | Part H - Drainage and Waste Disposal | Planning Portal

 

[rpm]

Is the grease trap in the correct place and has it been serviced? Many aren`t on both points.

 

[Riley]

Was gonna say if there is no fat trap fit one

 

[Riley]

Stainless Steel Grease Trap 9KGB | Grease Traps UK

 

[SJB060685]

Where should this grease trap be installed. I don’t think there was one honestly. The whole run was about 30-40m with 7 wastes connecting and no sign of anything like that before it terminated outside.

 

[rpm]

Where should this grease trap be installed. I don’t think there was one honestly. The whole run was about 30-40m with 7 wastes connecting and no sign of anything like that before it terminated outside.

C`mon, read your words out loud, no point in putting it at the end of the pipe run is there, might even need more than one.

 

[SJB060685]

Lol, I didn’t think that through properly before talking did I. I’ve had a look at the PDF and there is nothing like that on the system at all. You’re right they probably need at least two based on what I saw today.

 

[ShaunCorbs]

depends on whats being fed into it them two of them big sinks (the normal washing / prep sinks) normally 50mm for 5 of them 110mm i would want

but the grease needs to be sorted else nothing will win eg grease trap on one or two and just use them two for grease only

 

[SJB060685]

Thanks for the useful and funny replies. Clearly plumbing is not my area of expertise lol. There is no grease traps installed anywhere and there’s one large prep sink, three wash basins and three washing machines.