30 cm cheers bro
A kitchen WASTE pipe is 11/2" in many codes which is utter stupidity as the kitchen WASTE line does become reduced with grease and soap scum deposits
If the WASTE piping is going under ground to connect to the SOIL line (sewer piping) then 2" is strongly recommended as snaking an 11/2 line can be very challenging as the fittings are very short radius
The standard kitchen sink drain pipe size is 1 1/2 inches in diameter.
The recommended drain pipe size for a residential kitchen sink installation is typically 1.5 to 2 inches in diameter.
The standard kitchen drain pipe size for residential plumbing systems is typically 1 1/2 inches in diameter.
Depends on locality as many of the one family homes require I install sewer mains from 4" - 6". The size of the "sewer" is based on fixtures units that are connected and to local codes
Size of any drain is calculated by fixture units (7.48 gallons) and pitch of pipe with many codes giving a bare min sizes
4"
If the drain is used as a wet vent for another fixture 2". Otherwise 1.5".
The size of a standard sink drain pipe is typically 1 1/2 inches in diameter.
The recommended size for a sink drain pipe is typically 1.5 to 2 inches in diameter.
1-1/4" is typically the diameter of a bathroom lavatory drain pipe. 1-1/2" is more commonly the drain pipe size in kitchen sinks.
2"
The recommended pipe size for a kitchen sink installation is typically 1.5 to 2 inches in diameter.