Tube holes in tubesheet roughness 1

[MichaelDexter]

Hello
I am new here, and I have question, forgive my poor english

What is recommended tube holes roughness in tubesheets ? (TEMA code)

I can't find it in standards: TEMA, EN 13445-3
Regards Michael

I am pressure vessel, heat exchanger and storage tanks designer from Plock, Poland

 

[SnTMan]

MichaelDexter, TEMA does recommend, but rather states "workmanlike finish".

A rather rough finish, say 250 RMS, may be used to help effect a seal in expanded joints. On the other hand, reamed holes will have a finer finish, say 63. Tube holes can be given spiral grooves, knurled finishes, etc. Very much manufacturer's standard, depending on many factors, tube material, TS material, tube wall thickness, expansion process, etc, etc.

Drilled, reamed and grooved holes are widely used.

Regards,

Mike