Prefabricated and stress relieved before erection
Prefabricated and stress relieved before erection
(OP)
API 650 states :
5.7.4.3 When the shell material is Group IV, IVA, V, or VI, all opening connections requiring reinforcement in a shell
plate or thickened insert plate more than 13 mm (1/2 in.) thick shall be prefabricated into the shell plate or thickened
insert plate, and the prefabricated assembly shall be thermally stress relieved within a temperature range of 600 °C to
650 °C (1100 °F to 1200 °F) for 1 hour per 25 mm (1 in.) of thickness prior to installation
Is there any reason why we can not do local stress relief after erection before hyrdotesting?
I mean why we can't stress relief on nozzles to shell fillet weld joint only by electrical heater.
Syah
5.7.4.3 When the shell material is Group IV, IVA, V, or VI, all opening connections requiring reinforcement in a shell
plate or thickened insert plate more than 13 mm (1/2 in.) thick shall be prefabricated into the shell plate or thickened
insert plate, and the prefabricated assembly shall be thermally stress relieved within a temperature range of 600 °C to
650 °C (1100 °F to 1200 °F) for 1 hour per 25 mm (1 in.) of thickness prior to installation
Is there any reason why we can not do local stress relief after erection before hyrdotesting?
I mean why we can't stress relief on nozzles to shell fillet weld joint only by electrical heater.
Syah





RE: Prefabricated and stress relieved before erection
RE: Prefabricated and stress relieved before erection
RE: Prefabricated and stress relieved before erection
I did stress relief cone roof tank design for Amine product.
The tank is about 10 M by 8 M. We cover all surfaces of the tank by insulation about 50 mm thick.
We put a burner through 24" shell manhole
We did the same after a few years later for the same client in Indonesia for the same tank design.
We did not found any problem.
Syah
RE: Prefabricated and stress relieved before erection