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Chike Nwachukwu
Active Contributor

Join Date: Nov 2008
Posts: 23

Pig Launcher - Support Locations

01/26/2009 3:45 AM

I am still on the pig launcher design, and have encountered another problem I think will need yor input.

In locating the support, I used ASME Standard for locating saddles. But since I consider the launcher more of a pipe than a pressure vessel, and because I am designing based on ASME B31.8, I felt I must have done something wrong.

I need your advice.

My Process parameters are,

Launcher is 24" x 28"; Reducer=.610meter, Major Barrel= 5.7 meter, Minor barrel= 1.5meter.

Design Pressure 100 Bar, Design Temp 50 deg Cent. It is transporting Natural gas.

Regards,

Chike Nwachukwu
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Guest.
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Join Date: Dec 2008
Posts: 130
Good Answers: 17
#1

Re: Pig Launcher - Support Locations

01/26/2009 10:30 AM

Even though you are designing "pipe" in accordance with B31.8 - you may/have to look to other standards/codes for your design. In your case, when a reducer size is not specifed by ASME B16.9 or MSS SP-75 you may design as a "conical head" as per ASME Sec VIII Div 1 in accordance with B31.8 paragraphs 831.36, 831.373 & Appendix A.
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Guest.
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Join Date: Dec 2008
Posts: 130
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#2
In reply to #1

Re: Pig Launcher - Support Locations

01/26/2009 12:13 PM

Reading your question again - what exactly is the problem?

B16.9 has a standard size for 28"x24" reducer.
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Chike Nwachukwu
Active Contributor

Join Date: Nov 2008
Posts: 23
#4
In reply to #2

Re: Pig Launcher - Support Locations

01/27/2009 2:09 AM

Guest,

My question is that I want to know exactly how to determine the location of supports for the pig launcher, ang which code to use.

Chike.
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Guest.
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Join Date: Dec 2008
Posts: 130
Good Answers: 17
#6
In reply to #4

Re: Pig Launcher - Support Locations

01/27/2009 2:31 AM

(right - I was without my morning coffee when I read your question earlier)

You should design in accordance with the stress equations of B31.8 Sections 832, 833, 834. If you don't have access/knowledge of computer software (such as Caesar II) you will have to do it the manual way (which shouldn't be difficult as this is a pretty small system).
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2
Stewie
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Join Date: Jan 2009
Posts: 42
Good Answers: 3
#3

Re: Pig Launcher - Support Locations

01/26/2009 10:56 PM

In locating the support, I used ASME Standard for locating saddles. But since I consider the launcher more of a pipe than a pressure vessel, and because I am designing based on ASME B31.8, I felt I must have done something wrong.

I need your advice.

My Process parameters are,

Launcher is 24" x 28"; Reducer=.610meter, Major Barrel= 5.7 meter, Minor barrel= 1.5meter.

Design Pressure 100 Bar, Design Temp 50 deg Cent. It is transporting Natural gas.

Regards,

Chike Nwachukwu

Hi Chike,

Locate your major barrel saddle to be clear of the drain (2"?) and the kicker line. First trial 2.0 m from the QOC. Slope the launcher at 1 in 100 towards the drain. Locate the minor barrel saddle say 1.0 m from the end flange. Run Caesarii or Autopipe to check stresses.

BOL

Stewie
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Chike Nwachukwu
Active Contributor

Join Date: Nov 2008
Posts: 23
#5
In reply to #3

Re: Pig Launcher - Support Locations

01/27/2009 2:15 AM

Thank you Stewie, I will do just that and get back to you when I am through.

Chike.
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#7

Re: Pig Launcher - Support Locations

01/27/2009 3:48 AM

For manual design calculations for saddles, please refer to Pressure Vessel Handbook, 10th edition by Eugene F. Megyesy, Chapter Horizontal Vessels Supported by Saddles, Page 86 and a solved example Page 92.

(Pressure Vessel Publishing, Inc., P.O. Box 35365 " Tulsa, OK 74153)

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Chike Nwachukwu
Active Contributor

Join Date: Nov 2008
Posts: 23
#8
In reply to #7

Re: Pig Launcher - Support Locations

01/27/2009 11:37 AM

Great,

I have the latest edition of the book. I made reference to it, that was the basis of my question.

Thanks,

chike
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Anonymous Poster
#9

Re: Pig Launcher - Support Locations

01/28/2009 2:18 AM

hi

please follow 31.3 for receiver and launcher
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Users who posted comments:

Abdel Halim Galala (1); Anonymous Poster (1); Chike Nwachukwu (3); Guest. (3); Stewie (1)

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