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ASME B16.5 Flange DN550 / NPS 22 1
- Thread starter wcw1985
- Start date
- Thread starter
- #3
gr2vessels
Mechanical
Flanges DN 550 are listed in AS 2129.
Cheers,
gr2vessels
Cheers,
gr2vessels
LittleInch
Petroleum
Why don't you use MSS-SP44? They list 22"/550 flanges and are in the standard ASME pressure classes. Beware they are designed for pipelines and have different temperature ratings, but it is a recognised standard. 2006 is the latest version I have but there might be a newer one around.
See this for details as well.
Why 16.5 doesn't list them? - Probably simply no call for them, but lots gets lost in history with these standards.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
See this for details as well.
Why 16.5 doesn't list them? - Probably simply no call for them, but lots gets lost in history with these standards.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
- Thread starter
- #6
Thanks for reply gr2vessels and littleinch,
My company recently received a job that require to use a 22" flange as manhole.
Horizontal Vessel, Combination is 22" WNRF Flange (manhole with davit) + 22" Shell + 22" Cap. (U-stamp required)
Normally in the drawing i will create a table of nozzle stating nozzle detail.
Example:
Item | Type | Rating | Size | Qty |
N1 | ASME B16.5 | CL300 | DN200 | 2 |
How about "Type" for this case? Is it like:
Item | Type | Rating | Size | Qty |
N1 | ASME B16.5 | CL300 | DN200 | 2 |
M1 | MSS SP44 | CL300 | DN550 | 1 |
My company recently received a job that require to use a 22" flange as manhole.
Horizontal Vessel, Combination is 22" WNRF Flange (manhole with davit) + 22" Shell + 22" Cap. (U-stamp required)
Normally in the drawing i will create a table of nozzle stating nozzle detail.
Example:
Item | Type | Rating | Size | Qty |
N1 | ASME B16.5 | CL300 | DN200 | 2 |
How about "Type" for this case? Is it like:
Item | Type | Rating | Size | Qty |
N1 | ASME B16.5 | CL300 | DN200 | 2 |
M1 | MSS SP44 | CL300 | DN550 | 1 |
LittleInch
Petroleum
Looks good to me.
With vessels you need to be a little more careful and you could ask a similar question in the pressure vessels forum and get a different answer(!) I don't know how ASME VIII treats MSS SP-44.
A 22" manhole is normally regarded as being too small (min 24" and 30" is better. Can't you just use a 24" one instead?? I've entered vessels via 24" and it is a real squeeze - and I'm not that fat(!!)
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
With vessels you need to be a little more careful and you could ask a similar question in the pressure vessels forum and get a different answer(!) I don't know how ASME VIII treats MSS SP-44.
A 22" manhole is normally regarded as being too small (min 24" and 30" is better. Can't you just use a 24" one instead?? I've entered vessels via 24" and it is a real squeeze - and I'm not that fat(!!)
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
LittleInch
Petroleum
Just found out that min manhole dimension is 16"!!
Point still remains though - Can't you substitute a 24" pipe and flange?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
Point still remains though - Can't you substitute a 24" pipe and flange?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
-
1
- #9
A 16 inch manway can only be used by four-year olds....
They are frequently specified by "Value Engineers" (MBAs who try to keep the cost down) who blame others at the end of the job.
24 inch manways are a good choice.... but don't forget a divot and associated hardware to enable maintenance to get the cover out of the way. Allow space in the layout drawing to show the "pivot of the divot"
MJCronin
Sr. Process Engineer
They are frequently specified by "Value Engineers" (MBAs who try to keep the cost down) who blame others at the end of the job.
24 inch manways are a good choice.... but don't forget a divot and associated hardware to enable maintenance to get the cover out of the way. Allow space in the layout drawing to show the "pivot of the divot"
MJCronin
Sr. Process Engineer
- Thread starter
- #10
Dear Littleinch,
The manhole for this vessel is for user to replace the filter elements only ( as long as hand is reachable to the filter element to do some tighten/un-tighten and removing works of the element) is sufficient). The 22" is the design size to fit enough filter element into the vessel.
I saw some internet source that they got sell ASME B16.5 22" flange! example: texas flange
Is it valid for them to classify their flange as B16.5 for the size of 22" when B16.5 do not have any 22" flange.
The manhole for this vessel is for user to replace the filter elements only ( as long as hand is reachable to the filter element to do some tighten/un-tighten and removing works of the element) is sufficient). The 22" is the design size to fit enough filter element into the vessel.
I saw some internet source that they got sell ASME B16.5 22" flange! example: texas flange
Is it valid for them to classify their flange as B16.5 for the size of 22" when B16.5 do not have any 22" flange.
LittleInch
Petroleum
Fair enough for the size issue.
You would need to ask them how they would certify / sell these flanges and maybe they've just used the MSS-SP44 dimensions?
Interestingly though in some pages, e.g. page 14 bolt lengths, 22" suddenly disappears(!). Let us know what they say.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
You would need to ask them how they would certify / sell these flanges and maybe they've just used the MSS-SP44 dimensions?
Interestingly though in some pages, e.g. page 14 bolt lengths, 22" suddenly disappears(!). Let us know what they say.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
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