What is the minimum distance required for the hole in the cylinder of the pressure vessel?
As far as possible to avoid barrel longitudinal seam opening, if is really no way to avoid, should be to increase the inspection ratio (by 1.5 times the diameter of the cylinder hole radius, within the circle of welding seam, should be 100% RT inspection) of two adjacent hole center spacing (to surface spacing in terms of arc length) shall not be less than twice of the sum of the two hole diameter and the minimum distance should be not less than 50 mm
There is no mandate. It is the open hole is in the weld, the standard is to say is unfavorable, but not not can.
As far as possible to avoid barrel longitudinal seam opening, if is really no way to avoid, should be to increase the inspection ratio (by 1.5 times the diameter of the cylinder hole radius, within the scope of this circular weld, should be 100% RT inspection) of two adjacent hole center distance (to surface spacing in terms of arc length) shall not be less than twice of the sum of the two hole diameter and the minimum distance should be not less than 50 mm -- -- -- -- -- -- -- -- -- -- the rules from the "GB150-1998 steel pressure vessel" standard, now changed to "pressure vessel GB150-2011", "the TSG R0004-2009 fixed pressure vessel safety technology and supervision code", please consult, thank you.
