Posted by: Rajesh Malhotra
EJMA v/s ASME Cycles - 10/27/03 07:48 PM
In one of our projects we have to use in-line pressure balanced expansion joints as the line is connected directly between the reactor bottom nozzle and pump top nozzle. This is a process requirement and we have cyclic operation of the line with following conditions :
Op. / Des. Pressure = 3.5 / 26.8 barg
Op. / Des. Temp. = 130 / 250 Deg. C
No. of cycles = 26500 ( Op. case )
7000 ( Des. case )
Since our design code is ASME B 31.3 the no. of cycles were defined as ASME cycles in the requisition.
Vendors are coming back with calculations telling that they can give these cycles as per EJMA but not as per ASME.
Is it possible to accept the allowed no. of cycles as per EJMA instead of ASME? What are the issued involved?
In the past also the merits and demerits of ASME v/s EJMA cycles were posed to vendors in general but without any conclusive answers.
Appreciate detailed replies.
Regards.
Op. / Des. Pressure = 3.5 / 26.8 barg
Op. / Des. Temp. = 130 / 250 Deg. C
No. of cycles = 26500 ( Op. case )
7000 ( Des. case )
Since our design code is ASME B 31.3 the no. of cycles were defined as ASME cycles in the requisition.
Vendors are coming back with calculations telling that they can give these cycles as per EJMA but not as per ASME.
Is it possible to accept the allowed no. of cycles as per EJMA instead of ASME? What are the issued involved?
In the past also the merits and demerits of ASME v/s EJMA cycles were posed to vendors in general but without any conclusive answers.
Appreciate detailed replies.
Regards.