Engineering guides, grade selection resources and technical references for oil and gas professionals. Written for procurement managers and engineers specifying API-grade steel pipe.
Not sure which grade fits your project? Enter your well or pipeline conditions — our AI recommends grade, PSL level and connection type.
Try the Pipe Selector →Steel Pipe Weight Calculation: Formula, Chart, and Worked Examples
Calculate steel pipe weight by size and schedule. ASME B36.10M formula, worked examples, and weight chart for NPS 2–24 carbon steel pipe.
Schedule 40 vs Schedule 80 Pipe: Wall Thickness, Pressure Rating, and Cost
Schedule 40 vs Schedule 80 pipe: same OD, different wall. ASME B36.10M dimensions NPS 2–10, pressure ratings, cost difference, and when to specify eac…
NDT of Steel Pipe: Methods, API Requirements, and What to Specify
UT, MT, PT, ET — what each NDT method detects, when API 5CT and API 5L require it by grade, acceptance criteria, and how to write a complete NDE purch…
LSAW vs SSAW Pipe: Differences, Applications, and When to Specify Each
LSAW vs SSAW pipe: manufacturing, OD range, dimensional tolerance, weld geometry, and when each is specified for API 5L pipelines. Includes PO guidanc…
L80 Type 1 vs L80-13Cr vs L80-9Cr: OCTG Grade Selection for Corrosive Wells
L80 Type 1 is the sour-service grade. L80-13Cr and 9Cr resist CO2 — but fail in H2S. API 5CT 11th edition selection guide for corrosive wells.
How to Choose an API Oil Casing Pipe Manufacturer: A Procurement Guide
A guide to evaluating Chinese API 5CT casing mills — what to verify on the RFQ, what documents to request, and the red flags that precede a bad shipme…
What Type of Steel Is Used in Oil Pipelines? Grade and Standard Guide
What type of steel is used in oil and gas pipelines? API 5L X52–X80 grades, PSL1 vs PSL2, sour service Annex H, and manufacturing method selection gui…
P110 Casing Procurement Guide: TCO and Running Cost Analysis
P110 casing procurement: PO language, yield histogram trap, MTC verification checklist, and TCO vs N80Q and Q125. HPHT well sourcing guide.
H40 Casing in Shallow and Water Wells: Applications and Limits
H40 casing specifications, applications in shallow and water wells, and the exact load conditions where H40 fails. API 5CT procurement guide.
Deepwater Drilling Pipe — Materials, Coatings, and Connection Challenges
Deepwater drill pipe material selection, collapse rating, fatigue management, IPC coatings, and double-shouldered connections. API 5DP G105 and S135 g…
API Couplings — OCTG Threaded Connection Specifications and Selection
API couplings for OCTG: STC, LTC, BTC specifications, grade matching rules, sour service coupling selection, and procurement guide. ZC Steel Pipe.
X52 vs X60 vs X65 Line Pipe: Grade Selection Guide for Medium-Pressure Pipelines
API 5L X52, X60, and X65 line pipe grade comparison. Wall thickness design, PSL1 vs PSL2, delivery conditions, and procurement guidance for pipeline e…
Q125 in Ultra-Deep HPHT Wells: Design Limits and Procurement Guide
Q125 casing for ultra-deep HPHT wells: API 5CT Group 4 requirements, burst and collapse design examples, SSC exclusion, and procurement pitfalls vs P1…
Galling in 13Cr and CRA Connections: Causes, Diagnosis, and Prevention
Why 13Cr and CRA connections gall during makeup, how to identify galling in the field, and which thread compounds and running procedures prevent it.
Duplex vs 13Cr vs Incoloy 825: CRA Selection for HPHT Sour Wells
22Cr duplex, 2507 super duplex, L80-13Cr, and Incoloy 825 for HPHT sour wells. H₂S limits, FPREN, and procurement guidance per NACE MR0175 / ISO 15156…
Casing String Design for EPC Engineers: Step-by-Step Guide
Step-by-step casing string design for EPC engineers. Grade selection, collapse, burst and tension load analysis with worked calculations.
API 5L Line Pipe for Natural Gas Transmission: Grade and Wall Thickness Guide
Select the right API 5L grade and wall thickness for gas transmission. X52 vs X65 vs X70 PSL2, ASME B31.8 design examples, sour gas Annex H.
U-Tube, Fire-Tube, and Water-Tube Heat Exchangers: Engineering Comparison
U-tube, fire-tube, and water-tube heat exchanger engineering comparison. Tube material selection, TEMA standards, and procurement guide.
Super 13Cr in CO2-H2S Mixed Environments — When It Fails and What to Use
Super 13Cr failure limits in CO2-H2S wells: SSC risk, H2S partial pressure thresholds, temperature limits, and when to specify duplex or nickel CRA in…
J55 vs K55 Casing — Surface and Intermediate Casing Field Selection Guide
J55 vs K55 casing: same yield strength, different tensile, different connections. When to use J55 STC/LTC vs K55 BTC for surface and intermediate stri…
Heat Exchanger Tube Cleaning and Scaling: Maintenance Guide
Scaling, fouling, and cleaning guide for heat exchanger tubes. Hydroblasting, chemical descaling, TEMA fouling factors, and fin tube maintenance.
Finned Tube Manufacturers and Suppliers: Procurement Guide
How to source and evaluate finned tube manufacturers. What to specify on a PO, MTC requirements, API 661 compliance, and red flags in supplier qualifi…
Bimetallic and Copper-Nickel Fin Tubes for Corrosive Service
Bimetallic and cupro-nickel fin tubes for corrosive and marine service. ASTM B111 Cu-Ni alloys, selection guide, and procurement tips.
Abrasion Resistant Coating for Slurry and Multiphase Pipelines
Abrasion resistant pipe coatings for slurry and multiphase service: ceramic epoxy, RFBE, polyurethane, HDPE liner. Selection guide with specs and stan…
P110 vs L80 Casing — Why Use P110 Instead of L80 and When Not To
P110 vs L80 casing: yield strength, sour service limits, connection requirements, cost, and when to upgrade from L80 to P110. API 5CT selection guide.
L80 vs T95 Casing: When to Upgrade in Sour Gas Wells
L80 covers 80–95 ksi yield for mild sour wells; T95 upgrades to 95–110 ksi for deeper H2S applications. Grade selection guide per API 5CT and NACE MR0…
Finned Tubes: Types, Manufacturing, and Heat Exchanger Applications
Complete guide to finned tubes — extruded, welded, and crimped types, base tube and fin materials, API 661 dimensions, and heat exchanger applications…
Fin Spacing and Heat Exchanger Efficiency: Engineering Guide
Engineering guide to fin pitch selection — how fin spacing affects heat transfer, air-side pressure drop, fouling tolerance, and fin surface efficienc…
Extruded vs Welded vs Crimped Fin Tubes: Manufacturing Comparison
Compare extruded, HF-welded, and crimped fin tube manufacturing — bond type, max service temperature, fouling resistance, and when to specify each.
Casing Connection Types: STC, LTC, BTC and Premium — Selection Guide
STC, LTC, BTC and premium casing connections — tensile efficiency, gas sealing, sour service, and selection by well type. Quote from ZC Steel Pipe.
BTC vs Premium Connections — Casing & Tubing Selection Guide
BTC vs premium connections: when to upgrade, metal-to-metal seal, API 5C5 CAL IV, gas-tight requirements, HPHT and sour service. Request a quote.
BTC Make-Up Torque: API 5C1 Reference for 4½" to 13-3/8" Casing
BTC casing make-up torque from API 5C1: full table for 4½" to 13-3/8", friction factor adjustment for non-standard compounds, and field troubleshootin…
API 5L X80 Line Pipe — Specifications & Ultra-High Strength Guide
X80 line pipe: 555 MPa yield, PSL2, LSAW large diameter, X80 vs X70, strain-based design. Full MTC. Request a quote from ZC Steel Pipe.
API 5L X60 Line Pipe — Specifications, PSL1 & PSL2 Guide
X60 line pipe: 415 MPa yield, PSL1 vs PSL2, seamless and welded, sour service HIC, sizes and wall thickness. Full MTC. Request a quote.
API 5L Grade B Pipe: PSL1 and PSL2 Specifications
API 5L Grade B (L245) line pipe: PSL1 and PSL2 specifications, chemistry, Charpy toughness, and delivery conditions. Mill supplier for Africa and Midd…
API 5CT R95 Casing Pipe — Specifications, Grade Position & Selection
R95 casing: 95 ksi yield, Q+T, sweet service. Full mechanical properties, chemistry, R95 vs T95 vs P110 comparison. PSL-2. Request a quote from ZC.
API 5CT Q125 Casing Pipe — Specifications, Types & Application Guide
Q125 casing pipe: API 5CT specs, Type 1–4 subtypes, Q125 vs C110 vs P110, deep well applications. Seamless Q125 supplier. Request a quote from ZC Stee…
The Hardness Trap — API 5CT Limits vs NACE MR0175 for Sour Service Casing
API 5CT hardness limits vs NACE MR0175 for sour service casing: the 22 HRC vs 23 HRC gap, T95 Type 1 trap, HAZ hardness, and how to specify correctly.
API 5CT C90 Casing Pipe — Sour Service Specifications & Selection
C90 casing: 90 ksi yield, 25.4 HRC max, sour service approved. Specs, C90 vs L80 vs T95, chemistry, NACE MR0175 guidance. PSL-2. Request a quote.
API 5CT C110 Casing Pipe — Specifications, Sour Service & Supplier Guide
C110 casing pipe: API 5CT specs, hardness limits, NACE MR0175 sour service compliance, C110 vs T95 vs Q125 comparison. Request a quote from ZC Steel P…
Production Tubing Selection for Oil and Gas Wells: Grade and Size Guide
Select production tubing grade and size for oil and gas wells: N80Q, L80, T95, and 13Cr options, connection types, and procurement checklist per API 5…
N80-1 vs N80Q Casing: Heat Treatment Differences and When to Specify Each
N80-1 allows normalizing or Q+T; N80Q mandates Q+T only. Compare heat treatment, toughness, and procurement guidance per API 5CT 11th Edition.
Oilfield Pipe Overview: OCTG, Drill Pipe, Line Pipe, and Coated Pipe
Overview of oilfield pipe types: OCTG casing and tubing, drill pipe, line pipe, and coated systems. Grade selection and supplier guide for EPC enginee…
Boiler Tube Leaks: Diagnosis, Repair, and Prevention Field Guide
Field guide to diagnosing, repairing, and preventing boiler tube leaks. Covers pressure testing, weld repair, tube plugging, and replacement material …
Boiler Tube Coatings: Ceramic, Cladding, and Weld Overlay Protection
Guide to boiler tube protection coatings: ceramic thermal sprays, weld overlay cladding, and refractory materials for high-temperature corrosion and e…
What Is ERW Pipe? Manufacturing Process, Grades, and Applications
ERW pipe uses high-frequency resistance welding to form line pipe. API 5L grades B to X70, NPS 2–24. ZC Steel Pipe supplies ERW to Africa and Middle E…
What Are the Grades of OCTG Pipe: N80, L80, P110, Q125 and Beyond
Complete guide to API 5CT OCTG grades: H40, J55, K55, N80, L80, P110, Q125. Mechanical properties, service classification, and selection logic.
VAM Top vs Tenaris Blue vs API BTC: Gas-Tight Connection Comparison
Compare VAM Top, Tenaris Blue, and API BTC connections on gas-tight sealing, ISO 13679 ratings, and total installed cost for HPHT and sour wells.
Reducer Coupling and Reducing Coupling: Pipe Fitting Selection Guide
Reducer coupling and reducing coupling for pipe systems — types, ASME B16.9 and B16.11 standards, concentric vs eccentric, material grades. ZC Steel P…
OCTG Manufacturing Process: How API 5CT Casing and Tubing Are Made
How API 5CT casing and tubing are made: seamless vs ERW routes, Q+T heat treatment, NDT requirements, and threading. Grade-by-grade manufacturing guid…
LSAW Steel Pipe: JCOE Process, API 5L Specifications and Supplier Guide
LSAW steel pipe: JCOE process step by step, API 5L X52–X80 PSL2 specs, OD 406–1524 mm, weld inspection, and procurement guide for pipeline projects.
Hydrogen-Ready Pipelines: Line Pipe Selection for H2 Blending
Select hydrogen-ready line pipe for H2 blending: X65M, X70M, ASME B31.12, HIC resistance, embrittlement control, and procurement guidance.
Field Joint Coating Systems: Heat Shrink Sleeves, Liquid Epoxy, and Infill
Heat shrink sleeves, liquid epoxy, and infill field joint coating systems: selection criteria, standards, and inspection for 3LPE, FBE, CWC pipelines.
Coiled Line Pipe: Specifications, Sizes, and Offshore Applications
Coiled line pipe specs, OD range, API 5L grades, coiling strain limits, and offshore applications including deepwater flowlines and reeled installatio…
ASTM A234 WPB Pipe Fittings: Grades, Specifications and Supplier Guide
ASTM A234 carbon and alloy steel pipe fitting grades — WPB to WP91 chemistry, mechanical properties, temperature limits, and procurement guide. ZC fit…
Alloy Steel Pipe Grades: Chrome-Moly OCTG and Boiler Tube Guide
Chrome-moly alloy pipe grades — OCTG (13Cr, T95, C110) and boiler tube (T11, T22, T91) — grade selection for oil, gas, and power plant applications.
Vacuum Insulated Tubing: Specifications and Thermal Well Applications
Vacuum insulated tubing (VIT) for SAGD, CSS, and geothermal wells — construction, thermal performance, API 5CT grade selection, and procurement guidan…
P110 Casing Failure Analysis — Troubleshooting Failures in HPHT Wells
P110 failure modes in HPHT wells: H2S contamination, over-yield material, collapse, connection gas leaks, thermal fatigue. MTR checks and prevention.
Line Pipe vs Pipeline vs Pipe — Key Differences Explained
Line pipe, pipeline, and pipe are not the same thing. This guide explains the technical, regulatory, and commercial differences that matter to EPC eng…
BTC in Deviated and Horizontal Wells — Thread Seal Behavior and Limits
BTC thread seal in deviated and horizontal wells: galling risk, bending loads, DLS thresholds, field running procedures, and when to upgrade to premiu…
Boiler Tube Failure: 8 Common Causes and Prevention Guide
The 8 most common boiler tube failure mechanisms — overheating, erosion, corrosion fatigue, hydrogen damage — with diagnosis and prevention for each.
ASTM A333 Grade 6 Low-Temperature Carbon Steel Pipe: Specifications and Applications
ASTM A333 Grade 6 seamless and welded pipe: chemistry, impact test requirements at -45°C, sizes, and procurement guidance for cryogenic and LNG servic…
OCTG Connections TCO Guide: Premium vs API Thread Total Cost of Ownership
Total cost of ownership analysis for OCTG connections — compare API BTC vs premium threads across material, running, and NPT costs for well design.
Line Pipe vs OCTG: Technical and Regulatory Differences
API 5L line pipe and API 5CT OCTG are not interchangeable — compare standards, chemistry, tolerances, and why field substitution is prohibited.
Cathodic Protection and Pipeline Coatings: Designing a Combined System
Design a combined cathodic protection and coating system for buried pipelines — CP current density, coating selection, holiday testing, and NACE SP016…
API 5CT Tubing Sizes and Weights: Complete Selection Guide
Complete API 5CT production tubing sizes, weights, and connection types from 1.05" to 4.5" OD — NU, EU, and integral joint data for all well condition…
ASTM A312 Stainless Steel Pipe: Grade Selection and Specifications
ASTM A312 stainless steel pipe: grade selection for TP304L, TP316L, TP321, TP347. Chemistry, mechanical properties, and welding requirements.
ASTM A106 vs A53 vs API 5L Grade B: Carbon Steel Pipe Selection Guide
ASTM A106 vs A53 vs API 5L Grade B: compare chemistry, mechanical properties, and service scope to select the right carbon steel pipe specification.
What Is Line Pipe? API 5L Definition, Grades, and Applications
Line pipe definition, API 5L grades, PSL1 vs PSL2, manufacturing types (ERW, LSAW, seamless), and how line pipe differs from OCTG and structural pipe.
BTC Casing Running Procedure: Stabbing, Makeup, and Verification
Step-by-step BTC casing running procedure: pre-run inspection, stabbing, triangle stamp makeup, large-OD handling, and post-makeup logging for field e…
Q125 vs P110 Casing — HPHT Deep Well Selection Guide
Q125 vs P110 casing: yield, chemistry, hardness variation, connections, cost. Which grade for your HPHT sweet well? Full comparison. Request a quote.
Mill Test Certificate MTC — EN 10204 Types, Verification & Procurement
EN 10204 MTC types explained: 2.1, 2.2, 3.1, 3.2. When to specify each for OCTG and line pipe. What to verify before accepting pipe. Procurement guide…
Duplex 2205 and Super Duplex 2507 Stainless Steel Pipe — Selection Guide
Duplex 2205 and super duplex 2507 stainless steel pipe — PREN, mechanical properties, corrosion limits, NACE compliance and procurement guide.
DIN 2391 Cold-Drawn Precision Steel Tubes — Specifications and Tolerances
DIN 2391 precision cold-drawn steel tubes — tolerances, material grades St35 to St52, delivery conditions BK BKW GBK and hydraulic applications guide.
ASTM A572 Structural Steel Plate — Grade 50, 60 and 65 Specifications Guide
ASTM A572 Grade 50 structural steel plate — chemistry, yield strength, weldability, comparison with A36 and A992, and offshore structural applications…
ASTM A519 Seamless Mechanical Tubing — Grades, Tolerances and Selection Guide
ASTM A519 seamless mechanical tubing — carbon and alloy grades 1020 to 4140, OD/wall tolerances, heat treatment conditions and application selection g…
ASTM A516 Pressure Vessel Steel Plate — Grades 60, 65 and 70 Specifications
ASTM A516 Grade 60, 65 and 70 pressure vessel steel plate — chemistry, impact toughness, PWHT and procurement guide for pressure vessels and heat exch…
ASTM A312 TP304L and TP316L Stainless Steel Pipe — Specifications Guide
ASTM A312 TP304L and TP316L stainless steel pipe — chemistry, mechanical properties, heat treatment and corrosion service selection guide.
ASTM A213 Alloy Steel Tubes: T11, T22, T91 and T92 for High-Temperature Service
ASTM A213 T11, T22, T91 and T92 alloy steel boiler tubes — chemistry, high-temperature creep strength, heat treatment and mill cert requirements.
ASTM A192 and A210 Carbon Steel Boiler Tubes — Specifications and Applications
ASTM A192 and A210 seamless carbon steel boiler tubes — chemistry, mechanical properties, heat treatment and power boiler applications guide.
ASME B36.10M Pipe Schedule Guide — Wall Thickness, Weight & Selection
ASME B36.10M pipe schedules explained: Sch 40, 80, STD, XS, XXS. Wall thickness, weight tables, how to select schedule for design pressure. Full guide…
ASME B16.9 Buttweld Fittings: Elbows, Tees and Reducers — Specifications Guide
ASME B16.9 buttweld fittings — elbows, tees, reducers and caps. NPS ½–48, schedule matching, material grades A234 WPB to WP91. Quote from ZC Steel Pip…
ASME B16.5 Pipe Flanges: Pressure Classes, Facing Types and Material Groups
ASME B16.5 pipe flanges — classes 150–2500, weld neck, slip-on and blind types, facing styles and P-T ratings for carbon steel and alloy grades.
API 5L X80 PSL2 in Sour Gas Pipelines — HIC Requirements & Selection
Can X80 PSL2 be used in sour gas service? HIC testing requirements, SR15C, chemistry controls, X80 vs X65 vs X70 for sour pipelines. Full guide.
Casing Pipe — Complete Guide to Grades, Sizes, and Selection
Complete guide to API 5CT casing pipe: grades H40–Q125, sizes 4½–20 inch, sour service selection, string design, and procurement checklist.
What Is Oil Tubing — Production Tubing Guide for Oil and Gas Wells
Oil tubing explained: what production tubing does, API 5CT grades, OD sizes, EUE connections, sour service requirements, and selection guide.
What Is OCTG Pipe — Complete Guide to Oil Country Tubular Goods
OCTG pipe explained: casing, tubing, drill pipe grades, API 5CT standards, connections, and selection guide for oil and gas wells. Complete technical …
N80 vs L80 Casing — API 5CT Grade Comparison and Selection Guide
N80 vs L80 casing: yield strength, heat treatment, sour service limits, hardness, cost and selection guide per API 5CT. When to use each grade.
HAZ Softening in X65 and X70 LSAW Pipe — Causes, Limits and Field Control
HAZ softening in X65 and X70 LSAW pipe: causes, magnitude, acceptance limits, heat input control, and how to specify pipe with HAZ softening resistanc…
API 5L X70 vs X65 — Weldability, Cost and Selection for Pipeline Projects
API 5L X70 vs X65 line pipe: yield strength, weldability, carbon equivalent, cost difference, and when to upgrade from X65 to X70. Pipeline selection …
API 5CT Pup Joints — Specifications, Sizes and Selection Guide
API 5CT pup joints: standard lengths, OD range, grades, tolerances, and when to use pup joints for depth control in casing and tubing strings.
API 5CT J55, K55 and H40 Casing — Grades, Specs and Applications
API 5CT J55, K55 and H40 casing grades: yield strength, differences, dimensions, connections and applications. Low-strength OCTG grades explained.
API 5CT Casing and Tubing Couplings — Specifications and Selection Guide
API 5CT casing and tubing couplings: OD dimensions, grades, STC LTC BTC coupling specs, sour service requirements, and procurement guide. ZC Steel Pip…
13Cr vs Super 13Cr vs Inhibited Carbon Steel — CO2 Corrosion Selection Guide
13Cr vs Super 13Cr vs inhibited carbon steel for CO2 corrosion: temperature limits, H2S compatibility, cost and selection guide for gas wells.
Steel Piling Pipe — ASTM A252 Grades, Specifications & Application Guide
Steel piling pipe ASTM A252: Grade 1, 2 and 3 specs, OD range, wall thickness, yield strength, and application guide for foundation and offshore pilin…
Premium Connection Makeup Torque & Running Guide for Casing and Tubing
Premium connection makeup torque, running procedures, common mistakes and field guide for casing and tubing. API 5C1 and manufacturer specs explained.
Premium Connection CAL Ratings — ISO 13679 Qualification Guide for OCTG
ISO 13679 CAL ratings for premium casing connections: CAL I–IV explained, gas-tight requirements, HPHT and sour service selection, and procurement gui…
Pipeline Coating Selection for Sour Service and Offshore Applications
Pipeline coating selection for sour service and offshore: FBE, 3LPE, 3LPP, CWC compatibility, cathodic protection, and procurement guide. ZC Steel Pip…
LSAW vs Seamless Pipe for Large Diameter Pipelines — Selection Guide
LSAW vs seamless pipe for large diameter pipelines: OD range, wall thickness, grades X65–X80, cost, and selection guide for transmission pipeline proj…
L80 13Cr Casing & Tubing — Specifications, CO₂ Corrosion Resistance & Supply Guide
L80 13Cr casing and tubing: API 5CT specs, CO₂ corrosion limits, H₂S restrictions, vs Super 13Cr. PSL2 supply with EN 10204 3.2 MTC. Request a quote.
Internal FBE Coating for Line Pipe — Specifications, Applications & Guide
Internal FBE coating for line pipe: specifications, thickness, temperature limits, flow efficiency, application process and procurement guide. ZC Stee…
Field Fit-Up Failures — Managing Ovality and Hi-Lo in Large Diameter Girth Welds
Managing ovality and hi-lo misalignment in large diameter pipeline girth welds: causes, acceptance criteria, cold pulling limits, and procurement guid…
CRA Grade Selection Guide — CO₂ and H₂S Corrosion in Oil & Gas Wells
CRA grade selection for oil & gas wells: L80 13Cr, Super 13Cr, 22Cr duplex, 25Cr, nickel alloys. CO₂ and H₂S partial pressure decision framework.
Concrete Weight Coating for Offshore Pipelines — Specifications & Selection Guide
Concrete weight coating (CWC) for offshore pipelines: density, thickness, design, compatibility with FBE and 3LPP, and procurement guide. ZC Steel Pip…
Casing Connection Selection for HPHT, Sour Service and Deviated Wells
Casing connection selection for HPHT, sour service and deviated wells — combined loading, gas-tight requirements, grade compatibility and decision fra…
BTC Buttress Thread Casing — Field Guide to Makeup, Failure Modes and Limits
BTC buttress thread casing field guide: triangle stamp makeup, torque values, jump-out failure, gas sealing limits, and when to upgrade to premium con…
Beyond PSL2 — API 5L Annex H Metallurgy Requirements for Sour Gas Pipelines
API 5L Annex H requirements for sour gas line pipe: HIC testing, SSC, chemistry limits, hardness, and how to specify beyond standard PSL2 for H₂S serv…
API 5CT Tubing Connections — EU and NU External Upset and Non-Upset Guide
API 5CT tubing connections: EU (external upset) vs NU (non-upset) — specifications, tensile ratings, sizes, and selection guide for oil and gas tubing…
Welded Steel Pipe: ERW, LSAW and SSAW — Types, Specs & Selection Guide
ERW, LSAW and SSAW welded pipe compared — weld process, size ranges, pressure ratings, API 5L grades, offshore vs onshore. Request a quote from ZC Ste…
OCTG Sour Service Grade Selection — H2S, NACE MR0175 & Hardness Limits
OCTG grade selection for H2S sour service: L80, T95, C110 hardness limits, NACE MR0175 requirements, SSC risk, grade comparison. Quote from ZC Steel P…
Drill Pipe — API 5DP Grades, Sizes, Tool Joints & Selection Guide
Drill pipe grades E75 to S135, OD sizes, tool joint specs, API 5DP inspection classes. Drill pipe supplier for oil & gas. Request a quote from ZC Stee…
Casing Design Basics — Collapse, Burst and Tension Load Analysis
Casing design fundamentals: collapse, burst and tension load calculations, safety factors, grade selection by load case. Engineering guide from ZC Ste…
Super 13Cr Tubing — Specifications & CO₂ Corrosion Guide
Super 13Cr tubing specs: modified 13Cr, CO₂ corrosion resistance, temperature limits, vs L80 13Cr, sour service limits. Full MTC. Request a quote.
L80 13Cr vs Super 13Cr — Tubing Selection Guide
L80 13Cr vs Super 13Cr: corrosion envelope, temperature limits, yield strength, H2S tolerance, cost. When to upgrade. Full MTC. Request a quote.
Seamless vs Welded Line Pipe — How to Choose
Seamless vs ERW vs LSAW vs SSAW line pipe: pressure ratings, applications, cost, sizes. When each type is correct. Request a quote.
Oil Casing Length Ranges — R1, R2 and R3 Explained
API 5CT casing length ranges: R1, R2, R3 dimensions, when to specify each, average joint length, tubing ranges. Full MTC. Request a quote.
API 5L X70 Line Pipe — Specifications & High-Pressure Guide
X70 line pipe: 485 MPa yield, PSL2, LSAW large diameter, X70 vs X65 vs X80, onshore gas transmission. Full MTC. Request a quote.
API 5L X65 Line Pipe — Specifications, PSL2 & Applications
X65 line pipe: 450 MPa yield, PSL2 specs, offshore and sour service, X65 vs X70, LSAW and seamless. Full MTC. Request a quote.
API 5L X52 Line Pipe — Specifications, PSL1 & PSL2 Guide
X52 line pipe specs: 360 MPa yield, PSL1 vs PSL2, seamless and welded, sour service SR15, sizes and applications. Full MTC. Request a quote.
API 5L PSL1 vs PSL2 — Line Pipe Selection Guide
PSL1 vs PSL2 line pipe: testing requirements, chemistry, NDE, impact testing, when to specify each. Full MTC available. Request a quote.
API 5CT T95 Casing Pipe — Specifications, Types & Sour Service Guide
T95 casing specs: 95 ksi yield, Type 1 vs Type 2, NACE MR0175 hardness trap, T95 vs P110 vs L80. PSL-2 sour service. Request a quote.
3LPE vs FBE vs 3LPP — Pipe Coating Selection Guide
3LPE (80°C) vs FBE (95°C) vs 3LPP (110–140°C): layer structure, applications, ISO 21809 spec, coated line pipe supply. Request a quote.
API 5CT P110 Casing Pipe — Specifications, Grades & HPHT Guide
P110 casing specs: 110 ksi yield, HC variants, HPHT applications, P110 vs T95 vs L80, sour service limitations. Full MTC. Request a quote.
API 5CT N80 Casing Pipe — N80-1 vs N80Q Grades & Specifications
N80 casing specs: N80-1 vs N80Q heat treatment, dimensions 4½–20 inch, grade comparison vs L80 and P110. Sour service limitations. Request a quote.
API 5CT L80 Casing Pipe — Grades, Specifications & Sour Service Guide
L80 casing specs: L80-1 vs L80-9Cr vs L80-13Cr, sour service NACE MR0175 compliance, PSL1 vs PSL2, dimensions 4½–13⅜ inch. Request a quote.
API 5CT Casing Pipe — Complete Size & Dimension Guide
Complete API 5CT casing dimension tables: OD, wall thickness, weight, drift diameter for all sizes 4½″ to 20″. Grades N80–Q125. Request a quote.
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