Quick Open Cover

[gilsonnb]

I am developing a project to "Quick Open Cover" and would like to know which standard to follow or even a book. There's something written in ASME? Will be mounted on a simplex filter with 3.5 MPa of pressure and temperature of 200 ° C, Filter Material: ASTM A 351 CF8 (Cast).
Please help me.

 

[SnTMan]

gilsonnb, I would start by determining whether the work is to comply with a Code or Standard, and if so, which one. There may be some guidance contained therein.

Then, I would search the internet for various manufacturers products, to get some knowledge of the various styles available.

You could maybe just buy one.

Regards,

Mike

 

[rneill]

Unless you are a manufacturer yourself looking to develop a new product line, there are lots of these on the market and it would be quicker, easier and cheaper to just buy one rather than trying to develop something for one time use.

In general, most of the ones I've seen have been designed to ASME Section VIII Div 1.

 

[gilsonnb]

Yes, I am developing a product line. We are following the ASME SECTION VIII DIV.1 , But the standard only says about flat head , I wonder if there is a standard for the mechanisms of head.

 

[jte]

So since you're following Section VIII Div. 1 you have read Appendix FF and do not feel that it provides sufficient guidance for you to design to?

jt

 

[SnTMan]

I do not read UG-35.2 at all as applying only to flat heads.

If I were developing a product line I would definitely buy a few types...

Regards,

Mike

 

[gilsonnb]

Appendix FF UG and paragraph 35.2 is not itself sufficient information to design. But I thank everyone for their patience and attention. I'll see if I can find another way to calculate, design ...

Thank you very much

 

[rneill]

Well, there is always trial and error and UG-101 burst tests ... but probably not the most efficient way to start

 

[jte]

Let's not forget the Foreword, U-1(a)(3), and U-2(g).

jt

 

[SnTMan]

gilsonnb, I have not, and doubt I will ever design one of these closures, but I imagine the following:

The Code has sufficient rules to design the primary pressure retaining portions of the closure, I probably would not have any qualms about taking that part on. The basic mechanisms I also imagine to be relatively simple.

BUT I imagine the real guts of a true quick opening closure to be the safety and interlock systems. This is where, to my mind, the real "art" is involved. I expect these systems to be proprietary to a large extent, I doubt you will find design rules for them.

Interesting project, good luck.

Mike

 

[unclesyd]

I hate to be the party pooper but the conditions you state are going to require someone well versed in the art and science of PV design. Your temperatures are out limits of most materials for an O-ring seal. You haven't stated the diameter butthe highest pressure I've seen is around 300 psi for 18" dia t-bolt closure, and this was using an O-ring at 100°C. Your pressure is too high for a hinged bar closure. This doesn't leave many choices other than a bolted or screwed head and the exotics like a form of a breech lock or interrupted screw.

 

[unclesyd]

Some familiar with the ASME indexing sytem may be able to give you the title to this code book

http://files.asme.org/Catalog/Codes/PrintBook/13833.pdf

4.8.1 Scope...........................................4-166
4.8.2 Definitions ..................................4-166
4.8.3 General Design Requirements .......................................4-166
4.8.4 Specific Design Requirements........................................4-167
4.8.5 Alternative Designs for Manually Operated Closures ................4-167
4.8.6 Supplementary Requirements for Quick-Actuating

(Quick-Opening) Closures ....................................... .4-167

 

[Canadieng]

unclesyd

That is the new ASME VIII Div 2 table of contents.

 

[unclesyd]

Canadieng

Thanks for the information.

Part of the answer to the OP's question should be there.

 

[Canadieng]

I believe that gilsonnb is looking for explicit calculations that can be used verbatim - the "Quick Acting" chapters of VIII-2 are more vague/abstract. For example:

4.8.4.4 It is recognized that it is impractical to write requirements to cover the multiplicity of devices used
for quick access, or to prevent negligent operation or the circumventing of safety devices. Any device or
devices that will provide the safeguards broadly described in paragraphs 4.8.4.1.a, 4.8.4.1.b and 4.8.4.1.c
above will meet the intent of this Division.

 

[Canadieng]

also quoted from VIII-2 Annex 4.B "Guide for the Design and Operation of Quick-Actuating (Quick-Opening) Closures (Informative)":

4.B.3 Design
4.B.3.1 Code rules cannot be written to address each specific design; therefore, engineering judgment
exercised by a qualified designer with the necessary experience is required to achieve a safe design.
Because of the multiple requirements imposed on the design, it should be prepared by a designer with suitable
experience and training in the design of quick-actuating closures.

 

[gilsonnb]

Personal

Thank you for answers.

Unclesyd,
The range of work is the same, this is a filter 2", 3.5 MPa, 200 ° C, as B16.5, Material: 351 CF8, the thickness of the filter was calculated to meet these conditions.

As you said, I'm really looking for something simpler, ASME SECTION VIII DIV. 2 It is very vague. But give a look. Did not anyone have any picture, or some link, for me to see it to follow the?

Thanks.

 

[unclesyd]

Is the 2" dimension the actual OD?

Some possibility is to use a metal seated union design with blind side or a 2 bolt clamp flange or an acme or buttress thread threaded cap.

 

[unclesyd]

You state that your design code is ASME so you can use ASME 31.xxx fittings.

Here are two approaches mentioned in my previous post. Your environmental conditions take you out of the O-ring sealing range, which limits you to a metal to metal or a metal gasket configuration.
Your conditions also put you out of range of sanitary type clamping connections.
I think the Gandl Fittings would be your best approach by using a welding union with plug instead of the tail piece.
You could make the nut of different material to help alleviate galling.
The second site has screwed type quick opening head

http://www.gandlfittings.com/unions.htm?kc=5Qny8hFUZc75TItn6WcMM4EEoqFBiEJUAxr9OmYT#

http://www.islipflowcontrols.com/images/products/brochures/fabricated/FabStrainers_cat_21-22.pdf

 

[unclesyd]

Here are two additional possibilities for you closure.

http://www.in-line.ca/closures.html

http://www.durolok.com/index.html

An ASME paper on end closures.

http://scitation.aip.org/getabs/ser...0003000550000001&idtype=cvips&gifs=yes&ref=no