blind flanges are pipe terminations where a cap is bolted to a flange. flange size depends on the nps (nominal pipe size) and class (150#, 300#, etc.). piping is typically covered with hard insulation with a gap to allow for installation/removal of the stud bolts. a removable insulation blanket covers this gap while allowing for easy access for bolt inspection and/or line maintenance.
select the flange pressure class. ASME/ANSI B16.5 flange/piping standards come in pressure ratings which determine their diameter, thickness and bolt quantity/pattern.
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