Using Manway as Nozzle
Using Manway as Nozzle
(OP)
We have a 24" manway with standard flanges per ANSI B16.5 in a 8840mm dia. process column.Our Process engineers want to do some modification, for which they need to use this manway as an inlet nozzle by cutting a 16" opening in the blind flange and connecting it with a 16" line.
However, this doesn't seem to be feasible from strength considerations, as ASME code doesn't seem to allow it(Per UG-39, Only openings in size upto half the head dia. are allowed, for bigger openings, App. 14 is referred to.)
On taking a quick glance at App.14, I noted that this probably doesn't address bolted connecions, it is applicable only to integral connections.
1. Am I correct in my understanding of App. 14?
2. If yes, Can somebody please suggest other methods for evaluating reinforcement of such opening?
Regards,
Starrproe
However, this doesn't seem to be feasible from strength considerations, as ASME code doesn't seem to allow it(Per UG-39, Only openings in size upto half the head dia. are allowed, for bigger openings, App. 14 is referred to.)
On taking a quick glance at App.14, I noted that this probably doesn't address bolted connecions, it is applicable only to integral connections.
1. Am I correct in my understanding of App. 14?
2. If yes, Can somebody please suggest other methods for evaluating reinforcement of such opening?
Regards,
Starrproe





RE: Using Manway as Nozzle
More usually you would use a flanged conical reducer.
prex
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RE: Using Manway as Nozzle
As for cutting a hole in the blind, well, it would be much easier to use a 24 X 16 reducing flange and not worry about code calculations.
When it becomes a nozzle instead of manway, the connection flange becomes piping instead of vessel part.
RE: Using Manway as Nozzle
thread794-262240: Using Manways as Nozzles
thread292-257098: Installing 10" Nozzle through 22" manway...reinforcement calc?
Patricia Lougheed
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