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Rajcs82
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Join Date: Dec 2011
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Pipe Stress Analysis - Pig Launcher

12/04/2011 7:27 AM

I am doing stress analysis for natural gas plant which has part of under ground pipe and connected to above ground equipment( pig launcher), i got output which has the code compliance of 40% of allowable stress and the vertical displacements are with in 5mm but the force and moments are too large of 100000N at pig launcher inlet i really surprise and need help to balancing this force and moments, please some experts can help me?
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Usbport
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#1

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 7:50 AM

Pig launcher? If you're talking about a simple ham grenade you might find some people here who will help you. But if you're involved in a bacon of mass destruction, or a swine flew attack, you probably won't get much help.

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SolarEagle
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#2

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 9:01 AM

Yeah,,that can be a problem...

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MUKULMAHANT
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#7
In reply to #2

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 11:04 PM

The OP is not talking of a Pig or Bacon.

He is talking of PIG -oil country jargon for a traveling brush which scrapes the inside of a Oil Pipeline -- removes accumulated Waxy solids ---

Basically he is puzzled at his results .

It is his Poor stipulations which is showing fantastic stress buildup.

He must introduce the plastic flow in metal beyond yield point . Then all mystery will vanish.
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SolarEagle
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#8
In reply to #7

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 11:31 PM

Then I will send the brush man...

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lyn
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#3

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 9:03 AM

To continue with the ham parlance, it seems that you have bitten off more than you can chew.

Maybe you should stick with launching pumpkins.

"Big 10 Inch" takes a world record shot in Moab, Utah, September 9, 2010
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passingtongreen
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#4

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 9:33 AM

Say 23kips.

I have no expertise in this, but doesn't the pig get pushed along with the product? or is this for cleaning the pipe? How big is the pipe?

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Rajcs82
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#12
In reply to #4

Re: Pipe Stress Analysis - Pig launcher

12/05/2011 8:21 AM

dear sir

the pig trap is used for cleaning and it is connected by a 28 inch valve and the line immediately connected with buried piping. i feel the huge force and moments are from buried pipe line

may i consider the pig inlet nozzle as an non-anchor since the other end is buried and i feel the pipe has no enough length to have flexibility.

DESIGN CONDITION:

PRESSURE : 50BAR

TEMP: 50°C

OPERATING CONDITION:

PRESSURE: 40BAR

TEMP: 38°C

MATERIAL

28" PIPE: API 5L X65 SAW

24" PIPE: API 5L X65 ERW

please share your opinion

thanks.
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MUKULMAHANT
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#13
In reply to #12

Re: Pipe Stress Analysis - Pig launcher

12/05/2011 9:33 AM

Unless you send:

  • Piping Schematic Drawing
  • Physical Photograph
  • Point marked-- where your worrying stress concentration is

Nobody will be able to suggest/help/share opinion

MM
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CaptMoosie
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#5

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 10:36 AM

I seem to remember reading something about "Pigs flying"......

(Geee, I just couldn't help myself!)

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passingtongreen
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#6
In reply to #5

Re: Pipe Stress Analysis - Pig launcher

12/04/2011 11:55 AM

I cast my pearl of knowledge before....

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P.M.Ramakrishnan
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#9

Re: Pipe Stress Analysis - Pig Launcher

12/05/2011 12:20 AM

please refer FORMULAS IN STRESSES AND STRAINS by ROARK.

P.M.Ramakrishnan
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Whitephone
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#10

Re: Pipe Stress Analysis - Pig Launcher

12/05/2011 2:17 AM

ASME B31.8 Chapter III and IV
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stargan
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#11

Re: Pipe Stress Analysis - Pig Launcher

12/05/2011 3:19 AM

(PIG = Pipe internal Gauge)

I think you have to absorb all stresses in your pipeline design so the launcher nozzle will NOT be stressed.

This is common in such cases - we are doing it many times.
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ronclarke
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#14
In reply to #11

Re: Pipe Stress Analysis - Pig Launcher

12/05/2011 3:09 PM

PIG=Pipe inspection gaget or gage.

Ron

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stargan
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#15
In reply to #14

Re: Pipe Stress Analysis - Pig Launcher

12/06/2011 12:21 AM

OK - thanks!
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ronclarke
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#16
In reply to #15

Re: Pipe Stress Analysis - Pig Launcher

12/06/2011 8:11 AM

PIG doing a Delta ID measurement that I developed for the pipe industry.Ron

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stargan
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#17
In reply to #16

Re: Pipe Stress Analysis - Pig Launcher

12/06/2011 8:44 AM

Great photo...

Interesting!
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Users who posted comments:

CaptMoosie (1); lyn (1); MUKULMAHANT (2); P.M.Ramakrishnan (1); passingtongreen (2); Rajcs82 (1); ronclarke (2); SolarEagle (2); stargan (3); Usbport (1); Whitephone (1)

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