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MDMT for API 5CT tubing (J-55 and L-80)

MDMT for API 5CT tubing (J-55 and L-80)

MDMT for API 5CT tubing (J-55 and L-80)

(OP)
Hi,
API tubings are sometimes inspected after use and re-used on flow lines on tank batteries.
My question is particular on J-55 and L-80 type 1.
1. where can I find low temperature requirements (MDMT) for the above tubing types
2. from what I see in API 5CT impact test temperature,it appears those materials are not designed for low temperature, e.g -20F.
3. Is it typical for the two materials mentioned above to come with Charpy or are those usually upon request, i.e. does the mill run Charpy on them or are they additional mfg. test that should be requested.
4. Does any one have any experience with them in use are above ground piping for flow lines.
5. What about use in sour service?

Thanks for your help/input

As much as possible, do it right the first time...

RE: MDMT for API 5CT tubing (J-55 and L-80)

(OP)
API 5CT has a suggested V-Notch test temperature for J55 as 70F,
1. Does that technically translate to it's MDMT?
2. If yes, does that mean it's not recommended for use in temperature below that? like above ground line pipe from late fall to early spring which can be below 70F?
 

As much as possible, do it right the first time...

RE: MDMT for API 5CT tubing (J-55 and L-80)

Yes, it means that 70°F is near it's MDMT.  Stay away from it; either by not using it, or never using it above the frost line.

RE: MDMT for API 5CT tubing (J-55 and L-80)

1.  No, the MDMT is determined by the global environmental exposure parameters and not by an arbitrary Charpy test temperature.  Set the MDMT and then assess whether the material meets the necessary requirements.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: MDMT for API 5CT tubing (J-55 and L-80)

(OP)
Thanks Sjones, Duwe6.
1. @SJones, I was wondering if you mean the design minimum temperature (DMT) of the process or facility where you intend to use it and test the metal at or below that to ensure it can stand it...is that right?

2. another question is, knowing that they probably come with different heat number and slight variation in chemistry from different mills/manufacturer. If I test one order and they pass, does that mean I can use that to certify all of the tubing from any vendor as fit for the service or do I have to test every order /heat number??

Thank you.

As much as possible, do it right the first time...

RE: MDMT for API 5CT tubing (J-55 and L-80)

I have never seen these materials used in flow lines before, not to say it might not be done in some places. The upstream fields I work with the temperatures go very low, we don't use these.
As far as use in sour service, we certainly use both these materials downhole in sour environments, they are suitable & gernally resistant to SSC. They may not crack, but they do corrode, so if you use them, keep in mind they may corrode depending on what you are transporting and you may need some sort of internal corrosion control program.

RE: MDMT for API 5CT tubing (J-55 and L-80)

(OP)
Thanks brimmer

As much as possible, do it right the first time...

RE: MDMT for API 5CT tubing (J-55 and L-80)

Again, I would never use them anywhere that gets much below +70°F.  There are a LOT of materials that work fine during a cold snap.  These don't.

Like Sjones indicated, it is best to determine YOUR actual minimum temperature requirements, based on YOUR location and exposure, and them decide what MDMT you need to declare.  Then start looking at possible materials-of-construction.

Since I have seen frost and snow in Florida, and I have never seen a heat-trace system that has never failed, the only place in the USA I would use the downhole tubes above-ground is in Hawaii, near the beach.

RE: MDMT for API 5CT tubing (J-55 and L-80)

(OP)
I wish my job is in Hawaii...

As much as possible, do it right the first time...

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