Pig Launcher

ummm - to make pigs fly?

So, Is the kicker line how you attach the pig to the launcher?

Great,

This confirms my initial assumption. Thank you very much!

Finally someone who knows and understands Pig Launchers!

Bye

Dejan

XMech,

Seems like you know them like the back off your hand.

How would I go about sizing a RV for the Pig launcher?

I contacted Leser for some advice however they cant release the formulas for calculating and sizing RV.

Any good tips?

Thanks again and regards.

Dejan

I assume you are referring to thermal relief in the case of shut-in conditions? Is that correct?

Because the launcher should be protected by the pipeline relief in the operating case.

Xmech

no TRV my superior would like me to size a spring loaded RV...could you further explain how the system shields the Pig?

Thanks

Dejan

I will reply to your email address.

XMECH,

I am taskeed with Calculating the Relief VAlve for the Pig Launcher.

Size of Pig Launcher: 28" x 24" 600#(total length 7432 mm)

Fluid: Natural GAs

Operating Conditions:

Pressure : 97,5 Bar

Temperature 38 C

Design Conditions:

Pressure : 102,1 Bar

Temperature : 65 C

Hydraulic Test Pressure:

154 Bar

Corrosion allowance ; 3.2mm

Design factor : 0.6

Design Code:

Trap Body : ANSI B31.8

Quick Closure: ASME VIII Div.1

P.W.H.T.: YES

Thickness used: d=28" -- 22mm and d=24"--19mm

Materials:

Tubes: API 5LX-X52

Flanges: astm A105

Saddles: F37B UNI 7070

Capacity: 2.35m^3

How do I go about sizing aRelif Valve for the Above Pig Launcher Data?

Regards,

Dejan

XMech,

Where did you get that drawing from?

Bye,

Dejan

I simply high-jacked it from here:

http://www.ppsa-online.com/images/pig-launcher.jpg

thank you!

XMech! Being a utility / steam piping man (mostly in Processing Industries), for the first time I've come across this Pig Launcher. What is the application & system where this is used? What's a"pig" and why is it launched? The purpose? Honestly, I'd like to learn further. The Pdf I mentioned and gone through details couple of types of launchers. Please detail.

Pigs are typically used for cleaning piping systems though they may also be used (a different type) for inspection too.

The other purposes of using pigs include: internal visual inspection of pipe material or coating by remote cameras, corrosion monitoring, thickness gauging or condition monitoring using ultrasonic method or x-radiography, blockage or build-ups locations disrupting smooth flow etc.

Yup.

What they said +

http://www.ppsa-online.com/about-pigs.php

XMech,

How does a pig launcher become re-rated? Is it simply hydrotetsed and stamped by a qualified shop with a U stamp on the nameplate? Finally what if a Pig Launcher is refurbished can it ever be an ASME VIII pressure vessel?

Bye

Dejan

Thank you for your knowledge and will to share.

Thanks

Very Important to equalize the pressure and subsequently the used valves shouldn't have any flow restriction as Full Bore Type. If any one have idea against the ID of Valve bore is required to be equal to the Kicker Line ID, please advise.

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Download PDF http://www.ppsa-online.com/papers/2006-Aberdeen-3-Bacon.pdf

I used to get the used foam pigs and cut slices from them to make the best darn purge damns for stainless steel pipe. Those things were some kind of dirty though at first and we would have to beat all the crap outa them before we re-used them. The first time I saw a pig launcher was in the gulf of Mexico in the 1970's. I had gotten a very "country" buddy of mine a job and we had allot of fun fooling with him on his first time out on an oil rig.