What We Supply
OCTG — Casing & Tubing
API 5CT casing and tubing in grades N80, R95, L80, C90, T95, P110, C110, Q125. Premium connections available.
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Premium Connections
Metal-to-metal seal premium connections — ZC-1 through ZC-6 series. Gas-tight, API 5C5 CAL IV qualified. Independent patents.
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Seamless Line Pipe
API 5L seamless line pipe in grades X52 through X80, PSL1 and PSL2. Sour service HIC qualification available.
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Welded Line Pipe
ERW, LSAW and SSAW welded line pipe in API 5L grades X52–X80 for onshore and offshore pipeline projects.
View specs →Why ZC Steel Pipe
API 5CT, API 5L, ISO 11960 and ISO 3183 certified manufacturing. EN 10204 3.2 MTC on all orders.
Independent patents on ZC-1 through ZC-6 premium connection series. API 5C5 CAL IV gas-tight qualification.
Completed projects across Africa, the Middle East, South America and Southeast Asia. Third-party inspection available.
Non-standard grades, wall thicknesses and lengths available. Sour service, HPHT and CRA grades on request.
Technical Resources
Casing Tonnage Calculation: Tonnes, Metres and Joints on an API 5CT Casing Order
1,000 m of 9 5/8in 47 lb/ft casing is 69.94 t nominal or 68.75 t plain-end. The API 5CT mass formula, joints per tonne, Table 18 tolerances and the PO line.
Read article → OCTG7″ P110 Casing: The Five Weights You Can Actually Order, and the Coupling OD That Decides Them
7 inch P110 casing exists in five API 5CT masses — 26.00 to 38.00 lb/ft — all PLB. Coupling OD is 200.03 mm, and only buttress can be reduced to 187.32 mm.
Read article → OCTG2⅞″ L80 Tubing: Weight, Coupling, and the Drift That Stops Your Tools
2 7/8 L80 tubing: six API 5CT masses, a 59.62 mm (2.347 in.) drift on the 6.4 lb/ft, and three coupling ODs — NU 3.500, EU 3.668, special clearance 3.460 in.
Read article →Engineering Tools
Tell us your well depth, pressure, temperature and H₂S conditions — we'll recommend the right grade, PSL level and connection type.
Try the selector →API 5CT casing dimensions, API 5L line pipe grades, pressure calculator and ASME B31.8 design pressure calculator.
View spec tables →Need a quote?
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