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Chike Nwachukwu
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Join Date: Nov 2008
Posts: 23

Pig Launcher Reducer Material

01/09/2009 7:13 AM

I am a design engineer in the oil and Gas from Nigeria

I am presently doing a data sheet on a 24" X 28" Pig Launcher, the material of the pipeline ia API 5L X65. In calculating the wall thickness of the minor and major barrel I used the material of the pipeline. Since I could not find a spec for reducers in the API Spec I decided to use A516-65 plate material for this section of the launcher. I did this because the SMYS for both are the same and the other applications of both materials are close. All the same i do think that I might have done something wrong.

I need some proffesional advice on this and futher guide in this issue.

Thank you

Note: I had to resend the question b/c the titli was wrong.
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MUKULMAHANT
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#1

Re: Pig Launcher Reducer Material

01/09/2009 8:25 AM

If welding is OK-you have already Overdesigned--nothing to worry.

If you still have doubts, post a drawing , mark the areas where you still have doubts and ask CR4 members to comment/advise on adequacy of plate strength of barrel sections where you have doubts on. Do not forget to state operating pressures.

MM
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Chike Nwachukwu
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#2
In reply to #1

Re: Pig Launcher Reducer Material

01/09/2009 10:03 AM

Thank you Mukulmahnat, I am encouraged.
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master of none
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Location: Indy, USA
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#3

Re: Pig Launcher Reducer Material

01/09/2009 11:37 AM

How about one of these:

Sorry, couldn't help myself.

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babybear
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#4
In reply to #3

Re: Pig Launcher Reducer Material

01/09/2009 11:10 PM

Hello master of none:

I really love your drawing. Did you do it?

If so your name is a lie! You are certainly master of it!

Take care and have a great new year..............

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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

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#5

Re: Pig Launcher Reducer Material

01/10/2009 1:32 AM

You can simply apply the rules of ASME code, Section VIII, Div. 1 for calculating the thickness of conical heads and sections subjected to internal pressure, UG-32(g) : t = P D / [2 cos α (SE-0.6 P)],

where, t = Min. required thickness, in.

D = Inside dia. of larger barrel, in.

P = Internal design pressure, or max. allowable working pressure (taking into consideration the static head of fluid), psi

S = Max. allowable stress of reducer material, psi

E = Min. joint efficiency, percent

and α = 0.5 induced angle of cone at center line of the reducer, and α < 30o.

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mbaz_81
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#6

Re: Pig Launcher Reducer Material

01/10/2009 4:45 PM

You can look at ASME 16.9 in Mandatory appendix I table 11 all reducer specs you need will be there
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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

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#7
In reply to #6

Re: Pig Launcher Reducer Material

01/11/2009 1:10 AM

Dear mbaz_81, That is your 1st post in this forum CR4, you are welcome.

But, I'd like you to know that ASME B16.9 is only for those ready-made fittings: Factory-Made Wrought Buttwelding Fittings which are produced under the specs. of A 234. But our friend Chike Nwachukwu asked about the possibility of using plate material A 516-65, to be used in fabrication of the reducer instead of using ready-made reducer.

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Chike Nwachukwu
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#12
In reply to #6

Re: Pig Launcher Reducer Material

01/13/2009 6:31 AM

Thank you Mbaz 81.

I have looked that up.

Chike
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mbaz_81
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#8

Re: Pig Launcher Reducer Material

01/12/2009 3:33 PM

Thank you Mr.Abo Galala for your greeting and your good clarification .

I would like to add that as per para 5 in 16.5 standard : Wrought fittings shall be not only in accordance with A 234 but also A 403, A 420, A 815, B 361, B 363, B 366, or the corresponding standard listed in Section II of the ASME Boiler and Pressure Vessel Code. The term wrought denotes fittings made of pipe,tubing, plate, or forgings. Fittings made from block forgings may only be supplied subject to agreement between the manufacturer and purchaser.
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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

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#9
In reply to #8

Re: Pig Launcher Reducer Material

01/13/2009 1:01 AM

Para. 5 in 16.5?

B16.5 is only for Pipe Flanges and Flanged Fittings. May be you mean Para. 5 Material of ASME B16.9.

Yes, but when we speak about reducer from plate A516-65 we mean carbon steel material, where the closest material of ready-made is A234 Grade WPB.

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Chike Nwachukwu
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#10
In reply to #9

Re: Pig Launcher Reducer Material

01/13/2009 6:19 AM

Abdel Halim Galala

Thanks a lot for the great discussion and insight. I am more equiped with facts now.

Chike.
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Chike Nwachukwu
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#11
In reply to #8

Re: Pig Launcher Reducer Material

01/13/2009 6:21 AM

mbaz_81

This is another education on this subject. I have always tried to sought out the meaning of wrought.

Thank you.

Chike
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mbaz_81
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#13

Re: Pig Launcher Reducer Material

01/17/2009 7:37 AM

yes i mean 16.9 sorry for mistake of 16.5 this is misprint in my previous topic
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Users who posted comments:

Abdel Halim Galala (3); babybear (1); Chike Nwachukwu (4); master of none (1); mbaz_81 (3); MUKULMAHANT (1)

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