Monday, January 7, 2013

[MW:16459] API 620 Roof design requirements


Team members,

Please share your opinions related  as per API 620 if  any one in this group know then specify the  clause No. page no or if u have any document related to this query please attach.

The thickness of the thickened bar of the roof could be in the vicinity of 100 -120 mm (SA 516 Gr. 70 (N))

Is it possible to prepare a WPS for 100-120 mm thick C.S Plate without PWHT.

We can use this design only if the weld can pass PQT. 

The impact value required for plates is defined only up to 2" thickness in Code.

The alternative will be to use 50 mm thick knuckle [of 17 m radius (25% of tank dia.)] at the dome to shell junction, which will be very expensive. 

Please advise.


Regards,
kamal




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