Japanese Nominal Nozzle Sizes?

[Ding123]

Dear all:

I am working on a project in Japan. The customer specified nominal size for nozzles as 1B, 2B, 3B, etc. What kind of sizes are these stuff?

Thanks.

 

[JStephen]

I know nothing about Japanese piping. But a quick web search turns up this link:

http://mdmetric.com/tech/threadtech.pdf

Notice on it, they use 1B, 2B, 3B, not as nominal sizes, but as tolerance classes for threaded fittings. Could this be what you're seeing, rather than sizes?

 

[chicopee]

jstephen-I dont think Japan would be using our ANSI system of thread tolerance,ie, 1B,2B,3B; I am confident that they'll use metric tolerance designitions which would look something like this: 6g,6G,6h or 6H.

 

[JStephen]

I don't know what they use, the link I listed is showing JIS tolerances, which cover both systems of threads. Seems to be a dead post now anyway.

 

[JStephen]

I might point out that showing nozzle sizes as 1B, 2B, etc., would be different from normal metric practice, also- seems like the few metric tanks I've seen always just showed sizes in millimeters.