I'm working on a threading issue for one of our customers who's been trying to mate NPT threaded pipe into API 5L- couplings. They've been breaking a lot of tools because they're cutting super deep to account for the difference in tapers. The issues I'm having is with the fittings. We have tools to thread several different API specs but their fittings seem to be bizzarre.
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When we first encountered the problem they were using NPT tooling on sizes of 3" and 4" tubing and putting API couplings on them. We thought this was their primary issue and had them send us fittings for which we could try our API tooling and see if they fit. It appears the have standard 2-3/8 8RD and 2-7/8 8RD. It seems to provide a tight smooth fit and my only question is that when viewed from a profile(we cut a fitting in half) it appears the threads are v shaped on the fitting. This could just be the difference between internal and external threads for API though, my knowledge is limited to external threads only.
They also have a 2" fitting with the API logo stamped into it and the 5L- certificate as well. This is an API fitting, but it's different than a basic API 2" 10RD thread. It appears to have the 11.5TPI of normal NPT threads and the fitting appears to have a v shape internally. I know that other designations of API threads exist outside of the standard 10RD and 8RD of certain sizes. I'm at a loss as to what type of threading they're trying to do and unfortunately they seem less knowledgeable than I about their own products. I'd really just like to help these guys out but my knowledge of API is limited. Does anyone know anything who'd be willing to let me pick their brain? Does anyone know a good resource for learning about API standards? Any help would be greatly appreciated.
Edit: Shit, probably should have posted this in askengineers. Sorry!
API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.
Besides casing and tubing, it also includes pup joints, coupling stock, coupling material, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3). The requirements for PSL-1 are the basis of this standard.
Common Grades
• J55/K55
• N80/N80Q/L80
• C90
• R95/T95
• P110/C110
• Q125
Connections
API 5CT applies to the following connections which comply with API SPEC 5B:
• SC: Short round thread casing
• LC: Long round thread casing
• BC: Buttress thread casing
• NU: Non-upset tubing
• EU: External upset tubing
• IJ: Integral tubing connections
4 Groups of Grade
• Group 1: All casing and tubing in Grades H, J, K, N, and R
• Group 2: All casing and tubing in Grades C, L, M, and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q
General
Heat Treatment
Heat treatment methods for API 5CT casing and tubing are a key factor to differ in each grade. Products requiring heat treatment shall be subjected to full-body and full-length heat treatment. The heat-treated upsetting product should be heat-treated in terms of its full body and full length after upsetting.
A separately heat-treated coupling blank is acceptable. If the finishing temperature is higher than the upper critical temperature of the treated steel and the pipe is air-cooled, it shall be normalized.
in the case of welding type, the weld seam shall be heat treated to a minimum temperature of 540 ℃(°F), or a certain treatment method shall be used to make the no untempered martensite structure in the weld.
N80 Type 1 and Type Q
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Steel grade N80 type 1 products shall be normalized or normalized and tempered at the option of the manufacturer.
N80Q steel-grade products shall be quenched and tempered.
R95
R95 steel grade shall be quenched and tempered.
L80
When tempered at temperatures below 620 ℃(°F), grade L80 grade 13 Cr may be embrittled.
Straightening
R95
R95 casing and tubing shall not be stretched or expanded cold working after final tempering, except for cold working which is necessary for normal straightening and not more than 3% of compression cold working.
M65 and L80
Steel grade M65 and L80 products shall not be cold worked after final heat treatment except for the cold working required for normal straightening.
C90 and T95
C90 and T95 products can be cold-rotated straightened, but the pipe must be heated to a minimum temperature of 480 ℃(°F) degrees for stress relief after straightening. Light gag straightening for steel grade C90 and T95 products is allowed if necessary.
C110
If necessary, the product shall be cold-rotated straightened and subsequently stress-relieved at temperatures between 30℃to 55℃ (50°F to 100 °F) below the final specified tempering temperature, or hot-rotated straightened at temperatures not more than 165℃ (300°F) below the final specified tempering temperature. If necessary, it is allowed to do light gag straightening.
Q125
Gag-press straightening or hot-rotating straightening can be performed for straightening, but the temperature at the end of the rotary straightening should not be less than 400 ℃ (750°F) (unless a higher temperature minimum is specified on the order). If the hot rotary straightening method cannot be used, the product can also be cold-rotated straightened, but the stress relief must be performed at 510 ℃ (950°F) after straightening. The product cannot be subjected to stress relief after cold rotary straightening only by agreement between the purchaser and the manufacturer.
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