Compression ring per API std 620
Compression ring per API std 620
(OP)
Hello,
i am asking this questions for reference only:
when designing a compression ring, these factors must be calculated: Q (total circomferential force) and Ac (the net area to resist the compression fore):
QUESTION:
-in the case of finding Ac much bigger for than the participating area of roof and shell, which mean a big area to add in order to resist the compression force (say 50 square inche for example), what mesure should be taken ?
- in the case of having a positive compressive force Q, which mean the Q is acting as tensil force, should an area be added in order to resist against this force as well ?
looking forward to receiving your reply:
thank you in advance
i am asking this questions for reference only:
when designing a compression ring, these factors must be calculated: Q (total circomferential force) and Ac (the net area to resist the compression fore):
QUESTION:
-in the case of finding Ac much bigger for than the participating area of roof and shell, which mean a big area to add in order to resist the compression force (say 50 square inche for example), what mesure should be taken ?
- in the case of having a positive compressive force Q, which mean the Q is acting as tensil force, should an area be added in order to resist against this force as well ?
looking forward to receiving your reply:
thank you in advance





RE: Compression ring per API std 620
-Check that the application actually requires this design pressure and that the owner is prepared to pay the premium for it. Note that a flat-bottom tank may also require an unreasonably amount of anchorage in this case. It is not uncommon to see the pressure specified without a realization of the effects of it, and in many cases, the pressure can be reduced once the additional cost is pointed out.
-Increase roof slope
-Increase thickness of shell and roof members in the compression ring area so that additional area is reduced.
#2- Yes.
RE: Compression ring per API std 620
thank you for the quick and precise answer !!
i can't find though a limitation in API 620 about the maximum allowable area to add, or is it a rule a the thumb ?
looking forwrd to receiving your replys.
thank you in advance
RE: Compression ring per API std 620
RE: Compression ring per API std 620
could you be more specific about these limitaions, or where are exactly stated per API 620? i am asking about the the thickness not the widht because the widht is up a maximum of 16 * thickness of the plates.
thank yoy in advance.