Pipework size query for wetroom shower tray

[Stants]

Hi I'm laying the pipework in for a wetroom showertay

The trap is outlet 50 mm so was thinking of running it all in 50 mm

so does this sound ok , any problems with syphonage or anything else for that matter

2 mtrs Straight , drops down through soffit , turns left ( swept bend )1.5 mtrs into soilpipe all in 50 mm