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What is meant by Rz 160 for raised face flange?

What is meant by Rz 160 for raised face flange?

What is meant by Rz 160 for raised face flange?

(OP)
Hello guys,
In the piping specifications for my company, there are three types of flanges:
1- Type C: Raised face Rz=160, machined,
2- Type D: Raised face Rz=40, machined,
3- Type E: Raised face Rz=16, machined

Could anyone explain what is meant by Rz for raised face flanges?

RE: What is meant by Rz 160 for raised face flange?

This is a specification for the required surface finish for the face of the flange. The R refers to roughness and the z for the e.g. statistical parameter of profile measurements used to assess same. You would find a lot more detail from many sources with a keyword search e.g. under "machine finish".

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