Foul water and rain water Drainage ??

[Igotar1]

Im laying new foul water drainage next to a new extention. It will be servicing one sink and on fall pipe, there will be no solid waste in the system. My question is, can i use 87.5* bends in the drainage run to the man hole. It is only a short run of 5.5m. ???

Thanks for any help.

 

[r896neo]

Better to use a long radius 90 if you need to.

 

[noseall]

Waste from a sink can clog a 110mm pipe just as easilly as any loo. Grease and the possibility of a washing machine added on, means the pipe will need rodding access.
Slow bend or rodding eye me thinks.