Pipe Process of API 5CT Couplings
Round Pipe → pipe inspection → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application → Coating → Measurement of Length and Weight → Colour Identification → Marking → Packing → Warehousing
Round Pipe → pipe inspection → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application → Coating → Measurement of Length and Weight → Colour Identification → Marking → Packing → Warehousing
ASTM /ASME |
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Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
CASING AND TUBING |
API 5CT |
Casing:OD 4 1/2"- 20" (114.3mm-508mm) Tubing:OD 2 3/8" - 4 1/2" (60.3mm-114.30mm) WT: 0. 205"- 0.635" |
H-40, J55, K-55, N-80, C-75, L-80, C-90, T-95, P110, Q-125
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Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells |
SY/T 6194 / BS EN ISO 11960 / NF M87-207 |
Casing:OD 4 1/2"- 20" (114.3mm-508mm) Tubing:OD 2 3/8" - 4 1/2" (60.3mm-114.30mm) WT: 0. 205"- 0.635" |
H-40, J55, K-55, N-80, N80Q, C-75, L-80, C-90, T-95, P110, Q-125 |
SEAMLESS STEEL OIL WELL CASING, TUBING AND DRILL PIPE
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JIS G3439 |
Casing:OD 4 1/2"- 20" (114.3mm-508mm) Tubing:OD 2 3/8" - 4 1/2" (60.3mm-114.30mm) WT: 0. 205"- 0.635" |
STO-H, STO-J, STO-D, STO-E |
Application of API 5CT Couplings:
According to API 5CT standard, steel material used for making the pipe billet supplied shall be grain refining treatment. This steel shall contain one or more grain refining elements, such as a certain amount of aluminum, niobium, vanadium or titanium, so that the austenite grains of the steel Grain refinement.
• Pipes supplied shall be manufactured in seamless type or EW type.
• Couplings, coupling stock and coupling materials shall be in seamless.
• Cold drawn tubing pipe shall be properly heat treated, otherwise is not acceptable.
• Casing and tubing attachment materials shall be seamless pipe, unless other type stated on the order.
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.
Connections
API 5CT is applicable to following connections which complied 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
Groups of Grade
• Group 1: All casing and tubing in Grades with H, J, K, N and R
• Group 2: All casing and tubing in Grades with C, L, M and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q
API CASING COUPLINGS - SHORT THREAD (STC)
API CASING COUPLINGS - LONG THREAD (LTC)
API CASING COUPLINGS - BUTTRESS THREAD (BTC)
API TUBING COUPLINGS - EXTERNAL UPSET END (EUE)
API TUBING COUPLINGS - NON UPSET END (NUE)
COUPLING PIPE GRADE IDENTIFICATION BY PAINT COLOR
Grade |
Colour Coding (Painted Outside) |
H-40 |
Black |
J-55 or K-55 |
Green |
N-80 |
Red |
M-65 or L-80 |
Red with one Brown Band |
L-80 Type 9CR |
Red with two Yellow Bands |
L-80 Type 13CR |
Red with one Yellow Band |
C-90 Type 1 |
Purple |
C-90 Type 2 |
Purple with one Yellow Band |
T-95 Type 1 |
Silver |
T-95 Type 2 |
Silver with one Yellow Band |
C-95 |
Brown |
P-110 |
White |
Q-125 Type 1 |
Orange |
Q-125 Type 2 |
Orange with one Yellow Band |
Q-125 Type 3 |
Orange with one Green Band |
Q-125 Type 4 |
Orange with one Brown Band |
Seamless and ERW Casing
Specification |
API 5CT |
Grades |
K55, N80, L80, C95, P110, Chrome, J55(Modified), J55 (API), PS80 |
Special Grades |
For sour services and for deep well with high collapse properties |
Dimensions |
OD 4" - 26" WT - 0.2 -0.5" |
Length range |
1, 2 or 3 |
Thread connections |
API (STC and LTC), BTC, extreme line, VAM premium connections, integral connections, integral metal seal connections, threaded and coupled connections and integral thread seal connections, etc. |
Seamless and ERW Tubing
Specification |
API 5CT |
Grades |
J55 (API) J55(Modified), N80, L80, L80 13Cr, P110, Q125, H40 (API) |
Thread connections |
API 5B - Last Edition or Premium, VAM Premium, EUE, NUE, special seal, metal-to-metal seal and VAGT |