Steel Pipes for Oil & Gas Pipelines
A complete engineering reference for line pipe buyers — the energy value chain, steel grades, wall-thickness design, manufacturing routes, coatings, sour service and quality assurance, all on one page.
The Role of Line Pipe in the Energy Value Chain
Before comparing products it helps to see where pipe sits in the system: who buys it, what fluid it carries, and why each link of the chain imposes different demands on steel.
Pipelines move more hydrocarbons, more cheaply and with a lower incident rate per tonne-kilometre than any competing transport mode. A single 48-inch trunk line operating at 10 MPa carries the energy equivalent of several unit trains every day. That efficiency is why the global transmission network keeps expanding — and why line pipe remains one of the most specification-driven steel products in international trade.
Line pipe is a pressure boundary, not a structural section. It must contain a pressurised, often flammable and sometimes corrosive fluid for a design life of 30–50 years with minimal intervention. That is why the governing standards, API 5L and ISO 3183, are unusually strict: they control not only minimum strength but also maximum yield, fracture toughness, chemistry, weld-seam integrity, dimensional tolerance and heat-by-heat traceability.
Requirements change dramatically along the chain. Upstream flowlines fight H2S and CO2 in small bores; midstream trunk lines chase every tonne of steel saved through higher grades; downstream plant piping lives by ASME B31.3 and temperature extremes. Buying the right pipe is therefore a chain-specific engineering decision, not a catalogue lookup.
CREATEEL supplies all four manufacturing routes — seamless, HFW, LSAW and SSAW — in PSL1 and PSL2 quality, with 3PE/3LPP/FBE coating applied in-line or at partner plants, and a full EN 10204 3.1/3.2 documentation package on every order.
Large-diameter LSAW line pipe in 12 m joints, ready for coating and shipment.
Anatomy of a Pipeline System
From the wellhead to the city gate, every segment has its own diameter band, grade window and governing code — and every handover point is a change of responsibility worth documenting.
The table below follows one molecule of gas from the reservoir to the burner tip. Notice how the specification narrows: sour control dominates the upstream end, steel economy the long trunk, and public safety the distribution network.
Six Service Environments, Six Different Priorities
The same API 5L standard covers all of them — but the operating environment decides which clauses actually matter. Pick your scenario below to see what should drive the purchase specification.
Onshore Trunk Pipelines
Long-distance gas and oil trunk lines are classic PSL2 territory. The decisive purchase points are weld-seam quality (100% full-body UT of the HFW or SAW seam), CVN values valid at the design temperature, and bevel accuracy for automatic field girth welding.
- Key specifications
- • API 5L PSL2 X52–X80 · LSAW / HFW
- • OD 16″–56″ · WT 6–25.4 mm
- • 3PE / FBE coating · cathodic protection
- • Bevelled ends · protectors · low-temp CVN option
Offshore & Subsea Pipelines
Subsea export lines and platform piping see external pressure, current-induced free spans and no easy repair access. Projects typically follow DNV-ST-F101 with ECA-based fracture toughness and CTOD requirements, plus concrete weight coating on exposed routes.
- Key specifications
- • API 5L + DNV-ST-F101 project spec
- • X52–X70 · WT 8–40 mm
- • 3LPP / FBE ± concrete weight coating
- • ECA / CTOD fracture toughness evidence
Refinery & Petrochemical
Process piping inside refineries follows ASME B31.3. Seamless A106 Gr.B dominates ambient service, A333 Gr.6 covers cryogenic units, and alloy grades take the high-temperature heater and reactor circuits.
- Key specifications
- • ASTM A106 Gr.B · A333 Gr.6 seamless
- • OD ½″–24″ · schedule 40–160
- • ASME B31.3 · B16.25 bevels
- • Fulltrace heat treatment records
Gathering & Wellhead Systems
Flowlines and gathering systems see multiphase flow, H2S and CO2, and constant pressure cycling. Small-bore seamless or HFW pipe with sour-rated chemistry and hardness control keeps SSC and HIC risk manageable over decades.
- Key specifications
- • API 5L PSL2 + NACE MR0175
- • Gr.B–X65 · OD 2″–16″
- • SMLS / HFW · hardness ≤ 22 HRC
- • HIC / SSC test reports per heat
Sour Gas (H2S-Containing)
Wet sour gas defines the strictest metallurgy in the line pipe world: sulphur below 0.003%, calcium-treated inclusions, a hardness ceiling of 22 HRC and full HIC/SSC test evidence. See the sour service section below for the complete picture.
- Key specifications
- • API 5L PSL2 Annex H sour options
- • X52NS–X65QS qualified grades
- • NACE TM0284 & TM0177 testing
- • S ≤ 0.003% · Ca-treated inclusions
Arctic & Low-Temperature Service
Permafrost and sub-zero gas service shift the design driver from strength to toughness: low-temperature CVN, DWTT transition curves and controlled-rolling chemistry become the governing requirements, long before yield strength does.
- Key specifications
- • API 5L PSL2 low-temperature options
- • CVN tested at −45°C or lower
- • DWTT transition temperature evidence
- • Controlled rolling · fine grain
Steel Grades: Matching Strength to Pressure
Every grade step buys a thinner wall — but charges you in weldability and toughness testing. This section shows exactly how much steel each grade saves, and what it demands in return.
Minimum yield strength by grade
API 5L / ISO 3183 PSL2 specified minimum yield strength (SMYS).
Wall thickness needed at equal pressure
24-inch gas line, design pressure 10 MPa, ASME B31.8 Location Class 1 Div 2 (F = 0.72).
Upgrading a 24-inch gas trunk line from X52 to X65 cuts the required wall thickness by about 20%, which directly reduces steel tonnage, transport weight and field welding time. X80 pushes the saving past a third — the reason modern trunk line projects keep climbing the grade ladder.
The trade-off is metallurgical: higher grades need tighter CEV / Pcm control, more demanding weld procedure qualification and stricter fracture-toughness testing. PSL2 makes this systematic — minimum and maximum yield, CVN at 0°C or lower by agreement, a CEV ceiling and 100% weld-seam NDE are all mandatory.
| Grade | SMYS (MPa) | SMYS (ksi) | Min. tensile (MPa) | Typical service |
|---|---|---|---|---|
| Gr.B (L245) | 245 | 35.5 | 415 | Distribution, gathering, low pressure |
| X42 (L290) | 290 | 42 | 415 | Flowlines, small gathering systems |
| X46 (L320) | 320 | 46 | 435 | Gathering, small transmission |
| X52 (L360) | 360 | 52 | 460 | Distribution & mid-pressure trunk |
| X56 (L390) | 390 | 56 | 490 | Transmission, station piping |
| X60 (L415) | 415 | 60 | 520 | Gas transmission, subsea flowlines |
| X65 (L450) | 450 | 65 | 535 | High-pressure gas trunk lines |
| X70 (L485) | 485 | 70 | 570 | Large-diameter trunk (PSL2) |
| X80 (L555) | 555 | 80 | 625 | Steel-saving megaprojects (PSL2) |
Wall Thickness & Pressure Design
Two formulas and one table turn a design pressure into a purchase specification. Everything below follows ASME B31.4 (liquids) and B31.8 (gas) — the codes your pipeline engineer will quote back at you.
t = P · D / (2 · F · E · T · SMYS)
t nominal wall · P internal design pressure · D outside diameter · F design factor (see table) · E longitudinal joint factor (1.0 for SMLS, ERW, LSAW) · T temperature derating (1.0 up to 120°C). Rearranged, this gives the maximum allowable operating pressure: MAOP = 2 · F · E · T · SMYS · t / D.
More wall = more pressure capacity
MAOP of a 24-inch (610 mm) X65 gas line, F = 0.72, E = T = 1.0.
| Code / condition | Design factor F | Typical application |
|---|---|---|
| ASME B31.4 — liquids | 0.72 | Onshore liquid transmission (default), 1.25× test |
| B31.8 Location Class 1 Div 1 | 0.80 | Remote areas (≤ 10 buildings), 1.25× test |
| B31.8 Location Class 1 Div 2 | 0.72 | Remote areas (≤ 10 buildings), 1.25× test |
| B31.8 Location Class 2 | 0.60 | Fringe of towns, 11–45 buildings, 1.25× test |
| B31.8 Location Class 3 | 0.50 | Suburban, ≥ 46 buildings, 1.50× test |
| B31.8 Location Class 4 | 0.40 | Multi-storey, dense urban, 1.50× test |
Remember that these formulas size the pressure boundary only. Wall may still need to grow for handling stress, road/rail crossings (extra F reduction), HDD pull sections, buckling control in subsea lines (D/t ≤ ~50 is a common sanity limit) or wall-loss corrosion allowance — always check the special clauses of the route before freezing the wall schedule.
Manufacturing Routes: Seamless, HFW, LSAW & SSAW
Four routes deliver API 5L pipe. The route is not a price detail — it decides which diameters, walls and service conditions are even possible.
Outside-diameter coverage by route
Typical production ranges (inches). Overlap zones are decided by wall thickness, grade and project economics.
Seamless (SMLS)
A solid round billet is pierced, then rolled and sized — no weld seam at all, so properties are uniform in every direction. The default for sour flowlines, high-pressure small bore and thick-wall risers. Watch-outs: wall eccentricity and ID scale for hydraulic service, and a practical length limit around 12 m.
High-Frequency Welded (HFW / ERW)
Steel strip is cold-formed and welded by high-frequency induction without filler metal; the seam is heat-treated and 100% UT-tested. Cost-efficient at volume with tight OD/WT tolerance and a smooth bore — the natural choice for distribution, mid-pressure transmission and structural casing.
Longitudinal SAW (UOE / JCOE)
Heavy plate is pressed or rolled into a can, then submerged-arc welded inside and out with full radiography or UT. This is the large-diameter, high-pressure trunk route, where wall thickness, toughness and seam quality dominate the decision — and the documented basis of every deepwater export line.
Spiral SAW (SSAW / HSAW)
Coil is spiral-formed and double-side submerged-arc welded; bore follows coil width and forming angle, so very large diameters come economically. The long seam and anisotropic strip properties limit high-grade gas service — it shines in water transmission, low-pressure trunk lines and piling.
| Route | Typical OD | Typical WT | Strengths | Watch-outs |
|---|---|---|---|---|
| Seamless | ½″–24″ | 3–40+ mm | No weld seam · high pressure · sour-friendly | Price · wall eccentricity · length limits |
| HFW / ERW | 4½″–24″ | 4–16 mm | Tight tolerance · cost-efficient · high output | Seam UT mandatory · grade/wall ceiling |
| LSAW | 16″–56″ | 6–40 mm | Best large-OD high-pressure route · documented seam | Higher cost · plate sourcing lead time |
| SSAW | 20″–100″+ | 5–25.4 mm | Largest bores · economical from coil | Long seam · limited high-grade gas use |
Recommended Product Packages
Typical material packages for this application — every product line links to the certified range on this site.
| Product | Standard & grade | Route | OD range | Wall | Delivery condition | Typical use | |
|---|---|---|---|---|---|---|---|
| HFW Line Pipe | API 5L PSL2 Gr.B–X80 | High-frequency welding | 4½″–24″ (114–610 mm) | 4–16 mm | As-welded / N | Onshore transmission & distribution | Details → |
| LSAW Line Pipe | API 5L PSL2 Gr.B–X80 | UOE / JCOE | 16″–56″ (406–1,420 mm) | 6–40 mm | Normalized / Q&T | Trunk lines · subsea pipelines | Details → |
| Seamless Line Pipe | API 5L Gr.B–X70 | Hot-rolled seamless | 2″–20″ (50–508 mm) | 4–40 mm | N / Q&T | Flowlines · risers · high pressure | Details → |
| Welded Line Pipe | API 5L PSL1/PSL2 | HFW / LSAW mixed package | ½″–56″ | 4–40 mm | Per grade | Full line pipe packages, mixed routes | Details → |
| 3PE Coated Pipe | ISO 21809-1 / DIN 30670 | In-line or partner plant | All above ranges | 2.2–6.4 mm total | FBE + adhesive + PE | Buried onshore & subsea service | Details → |
| FBE Coated Pipe | CSA Z245.20 / ISO 21809-2 | Single & dual layer | All above ranges | 300–1,000 µm | Epoxy fusion-bonded | High-temp · HDD · subsea | Details → |
Corrosion Protection: Coatings & Cathodic Protection
A pipeline fights corrosion on two fronts — the coating is the first line of defence, the cathodic protection system is the backup that keeps working when the coating is damaged.
3LPE cross-section
Three-layer polyethylene system per ISO 21809-1 / DIN 30670.
- PE topcoat 1.8 – 3.7 mm
Impact, moisture and soil-stress barrier - Copolymer adhesive 170 – 250 µm
Bonds PE to the epoxy primer - FBE primer 150 – 250 µm
Cathodic-disbondment resistant layer - Pipe steel substrate per design wall
API 5L / ISO 3183 line pipe body
| System | Standard | Max. temp. | Where it wins |
|---|---|---|---|
| 3LPE | ISO 21809-1 / DIN 30670 / CSA Z245.21 | ≤ 70–80°C | Buried onshore default · excellent CD resistance |
| 3LPP | ISO 21809-1 (PP) | ≤ 110–130°C | Subsea, HDD and hot service lines |
| FBE single | CSA Z245.20 / ISO 21809-2 | −45…110°C | Subsea · plant piping · best CD values |
| FBE dual (abrasion) | CSA Z245.20 dual-layer | −45…110°C | HDD pulls · rocky terrain · mechanical shield |
| Internal epoxy | API RP 5L2-type liquid epoxy | ≤ 90°C | Flow-efficiency coating — reduces friction, boosts throughput |
Cathodic protection — the invisible partner
No coating is perfect, so every buried or subsea line pairs it with CP: sacrificial anodes (Mg/Zn) for short or well-coated runs, impressed-current (ICCP) stations for long trunk lines. Coating quality directly sets the CP current demand — which is why holiday detection (typically 5 V/µm), cathodic-disbondment testing and coating-condition surveys are written into NACE SP0169 / ISO 15589 compliance plans.
Sour Service: When H2S Rewrites the Specification
Wet sour gas changes the failure mode from leak-before-break to sudden cracking. The rules come from NACE MR0175 / ISO 15156 — and they penetrate far deeper into the mill process than any strength requirement.
The threat
H2S in the presence of water loads the steel surface with atomic hydrogen. Two cracking mechanisms follow: SSC (sulfide stress cracking) under tensile stress, and HIC (hydrogen-induced cracking) along mid-wall inclusions — neither needs external load to grow.
The metallurgy
Sulphur capped at 0.003% (often 0.002%), calcium treatment to spheroidise inclusions, restricted Mn segregation in the slab, hardness ≤ 22 HRC (248 HV10), controlled carbon equivalent — and a rolling schedule that kills centreline segregation. Every heat is documented, not assumed.
The evidence
NACE TM0284 (HIC, Solution A or B), TM0177 Method A (SSC, uniaxial tension), and TM0316 where SOHIC is credible. Samples come from mid-wall — exactly where HIC lives. Full test reports ship with each lot.
CREATEEL supply
Sour-qualified line pipe in X52NS–X65QS per API 5L PSL2 Annex H, with HIC/SSC certificates, hardness surveys and heat-by-heat chemistry traceability — third-party witnessed on request.
How to Specify: A Six-Step Decision Guide
Use this sequence for RFQs — answering the steps in order prevents the most expensive mistake in line pipe buying: a technically correct offer for the wrong problem.
- 1Define the service & fluid
Sweet gas, sour gas, oil, multiphase? This single answer decides PSL level, Annex H applicability and the whole corrosion strategy. - 2Fix design pressure & temperature
Compute wall with t = P·D / (2·F·E·T·SMYS) per B31.4 / B31.8 — the pressure and diameter together pick the economical grade. - 3Map the environment
Buried, subsea, aboveground, road crossings, HDD sections — each adds coating, wall or toughness requirements beyond the pressure calc. - 4Pin the codes & client spec
API 5L PSL1 vs PSL2, DNV-ST-F101 for offshore, B31.3 for plants, plus any project-specific appendix — quote against the stated revision. - 5Choose the manufacturing route
Match diameter, wall and service to SMLS / HFW / LSAW / SSAW using the coverage chart above; confirm mill approvals for the grade. - 6Agree the documentation & TPI scope
EN 10204 3.1 or 3.2, NDE extent, witness points for third-party inspection — the cheapest disputes are the ones settled before PO.
Line Pipe Sizes: Imperial–Metric Quick Reference
Most RFQs still arrive in inches while the mills roll in millimetres. This table converts the API 5L outside-diameter series so procurement, engineering and freight all quote the same pipe. Wall thickness is then selected by the design formula in the pressure section — OD is standardised, wall is calculated.
| OD (in) | OD (mm) | API 5L convention | Typical duty |
|---|---|---|---|
| 2-3/8 | 60.3 | Unlisted size | Flowlines, small gathering |
| 4-1/2 | 114.3 | Unlisted size | Gathering systems |
| 6-5/8 | 168.3 | Unlisted size | Small transmission, water injection |
| 8-5/8 | 219.1 | Unlisted size | Mid-size transmission, injection lines |
| 10-3/4 | 273.1 | Unlisted size | Transmission |
| 12-3/4 | 323.9 | Unlisted size | Transmission (largest unlisted OD) |
| 14 | 355.6 | Listed size | Transmission |
| 16 | 406.4 | Listed size | Transmission |
| 20 | 508.0 | Listed size | Trunk lines |
| 24 | 610.0 | Listed size | Trunk lines |
| 30 | 762.0 | Listed size | Large trunk |
| 36 | 914.0 | Listed size | Large trunk |
| 42 | 1067.0 | Listed size | Megaproject trunk |
| 48 | 1219.0 | Listed size | Megaproject trunk |
Note: Up to 12-3/4″ the nominal size does not equal the actual OD; from 14″ upward the nominal size equals the OD in inches exactly — that is the “listed” convention. Intermediate ODs between these sizes are produced on request; ask us to quote them as special runs.
Quality Assurance & Testing, Clause by Clause
API 5L PSL2 quality is not a certificate — it is a chain of tests run on your actual pipe. Here is what runs, in what order, on every order we ship.
Chemistry & Mechanicals
Ladle analysis per heat, tensile on each lot (yield, tensile, elongation — with PSL2 maximum limits enforced), CVN impact at the specified temperature, and DWTT for thick-wall transmission pipe.
- Key specifications
- • CMTR per heat · CEV / Pcm reported
- • YS/TS both min and max checked
Weld-Seam & Body NDE
100% ultrasonic testing of the weld seam on HFW and SAW pipe, pipe-end lamination checks, optional full-body UT, and automated seam evaluation calibrated to reference notches.
- Key specifications
- • 100% seam UT · calibrated notches
- • End lamination · optional full-body UT
Hydrostatic Test
Every single joint is pressure-tested per the API 5L formula with a welded or capped end, held for the specified time, and recorded by serial number — no exceptions, no lot sampling.
- Key specifications
- • 100% of joints · P = 2·S·t/D
- • Serial-numbered test records
Dimensional Survey
OD and ovality, wall by ultrasonic thickness, length, straightness and bevel geometry per API 5L (or ASME B16.25 where field welding demands it), measured against the order tolerances.
- Key specifications
- • OD · ovality · WT · length
- • Bevel per API 5L / B16.25
Coating Inspection
Coating thickness mapping, high-voltage holiday detection (typically 5 V/µm), cathodic disbondment, adhesion and impact tests on production samples — documented per coating standard.
- Key specifications
- • Holiday detection · CD test
- • Thickness map · adhesion & impact
Traceability & Documentation
Heat number to pipe number through every process step, preserved in the EN 10204 3.1 (mill) or 3.2 (mill + third party) certificate package that travels with the shipment.
- Key specifications
- • EN 10204 3.1 / 3.2 MTC package
- • Heat-to-pipe traceability chain
Inspection & test matrix — what runs on every order we ship
| Test | Method | Frequency | Acceptance reference |
|---|---|---|---|
| Chemistry | Ladle spectro analysis | Every heat | API 5L Table 4 — incl. CEV / Pcm limits |
| Tensile | Coupon — YS / TS / elongation | Each test unit | API 5L Table 6 — minimum and PSL2 maximum |
| Charpy (CVN) | V-notch, 3 specimens | Per heat / lot | API 5L Table 22 at the specified test temperature |
| DWTT | Drop-weight tear test | Grade ≥ X70, heavy wall | API 5L Annex G — ≥ 85% shear area |
| Weld-seam NDE | 100% ultrasonic (HFW / SAW) | Every joint | API 5L §9.10 / ISO 10893 |
| Pipe-body NDE | UT or RT on end areas | As specified | API 5L Table 20 / 21 |
| Dimensional | OD, ovality, wall, length, straightness | Every joint | API 5L Tables 10–12 |
| Hydrostatic | Water, P = 2·S·t/D | Every joint — no lot sampling | API 5L §9.4 |
| Coating | Holiday (DC), adhesion, cathodic disbondment | Per pipe / per lot | ISO 21809-1/-2, CSA Z245.20 |
| Documentation | Marking + MTC / CMTR | Every joint | API 5L §11, EN 10204 3.1 / 3.2 |
Standards & Certification Map
The vocabulary of a line pipe inquiry in one place — product, design, corrosion and quality documents, each with its role in the package.
Product standards
- ✓ API 5L / ISO 3183
Line pipe, PSL1 & PSL2, Gr.B–X80 - ✓ EN 10208-2
European line pipe for flammable fluids - ✓ ASTM A106 Gr.B
Seamless carbon plant piping - ✓ ASTM A333 Gr.6
Seamless for low-temperature service - ✓ API 5CT
OCTG casing & tubing (reference)
Design codes
- ✓ ASME B31.4
Liquid pipeline transportation systems - ✓ ASME B31.8
Gas transmission & distribution - ✓ ASME B31.3
Refinery & petrochemical process piping - ✓ DNV-ST-F101
Submarine pipeline systems - ✓ CSA Z662
Canadian oil & gas pipeline systems
Corrosion & sour
- ✓ NACE MR0175 / ISO 15156
Materials for H2S service - ✓ NACE TM0177 / TM0284
SSC & HIC test methods - ✓ ISO 21809-1
3PE / 3LPP external coatings - ✓ DIN 30670 / 30671
PE & PP coating execution - ✓ CSA Z245.20 / 21
FBE & PE/PP field standards - ✓ NACE SP0169
External cathodic protection
Quality & documents
- ✓ EN 10204 3.1 / 3.2
Inspection certificates, mill / third party - ✓ ISO 21809-3
Field-joint coatings for pipeline welds - ✓ API Spec Q1
Petroleum industry quality systems - ✓ ISO 9001
General QMS certification - ✓ PED 2014/68/EU
European pressure equipment directive
Frequently Asked Questions
The questions buyers actually ask — answered the way our engineers answer them on calls.
What is the difference between PSL1 and PSL2 line pipe?
PSL2 is a stricter quality level than PSL1: it mandates CVN impact testing, sets maximum yield and tensile limits (not just minimums), requires 100% non-destructive examination of the weld seam, tightens chemistry (max CEV) and defines testing frequency. Most modern transmission pipelines specify PSL2.
Can you supply X70/X80 large-diameter pipe?
Yes. We supply LSAW (JCOE) pipe in X65–X80 up to 56″ OD with wall thickness up to ~40 mm, including Pcm-controlled chemistry, controlled rolling and full PSL2 testing. Lead time depends on wall and grade — typically 45–90 days.
What coating do you recommend for buried gas pipelines?
3PE (three-layer polyethylene) is the industry default for buried onshore service, providing excellent cathodic-disbondment resistance. For operating temperatures above ~70°C, 3PP or high-temperature FBE is recommended. All coatings include holiday detection and CD testing.
What extra requirements apply in sour service?
NACE MR0175 / ISO 15156 compliance, HIC and SSC test evidence per NACE TM0284 / TM0177, sulphur ≤ 0.003%, calcium-treated inclusions and a hardness ceiling of 22 HRC. Sour grades are typically designated X52NS to X65QS under API 5L PSL2 Annex H.
What is special about subsea (offshore) line pipe?
Projects usually follow DNV-ST-F101: ECA-based fracture toughness, CTOD testing, tighter D/t limits for collapse, external pressure checks, and coatings such as 3LPP or FBE with concrete weight coating on exposed sections. Documentation and third-party witness points are heavier too.
What is the difference between EN 10204 3.1 and 3.2?
A 3.1 certificate is issued by the manufacturer's own authorised inspection representative, independent of the manufacturing department. A 3.2 certificate additionally requires validation by a third-party inspector (SGS, BV, TÜV…) who signs the document. Critical offshore and sour orders usually specify 3.2.
Why would we add an internal (flow-efficiency) coating?
A thin (≈50–100 µm) epoxy internal coating smooths the bore, cutting friction losses and allowing higher throughput for the same compressor power — on long gas trunk lines the energy savings routinely repay the coating cost within the first operating years.
How is wall thickness verified on delivery?
Ultrasonic wall-thickness measurements at defined positions around and along every pipe, recorded on the MTC. Minimum wall is checked against the API 5L tolerance table — for PSL2, mill undertakes systematic UT so that the wall map is part of the documentation package.
Do you support third-party inspection before shipment?
Yes. We regularly work with SGS, BV, TÜV, Applus and customer-appointed inspectors. Witness points typically include hydrostatic test, weld-seam UT/RT, mechanical test review, dimensional survey, coating holiday test and marking verification before loading.
How do I estimate pipe weight for freight and span planning?
Use W (kg/m) = (D − t) × t × 0.02466, with D and t in millimetres — the standard steel-pipe weight formula. For a 610 × 12.7 mm X52 joint that works out to ≈ 187 kg/m, so a 12 m joint ships around 2.25 t plus bevel protectors. We confirm exact joint weights on the offer.
Can you supply bends, tees and induction bends to match the pipe?
Yes — hot induction bends in 3D–6D radii matched to grade and wall, plus welded fittings and flanges. Supplying line pipe and bends through one mill chain keeps heat-number traceability intact across the whole system.
How is the Charpy (CVN) impact test temperature chosen for PSL2 pipe?
API 5L sets a default CVN test temperature by grade, product form and wall — typically 0°C for PSL2 transmission grades. If the line will run cold, the lower temperature has to be written into the order (common values are −20°C and −45°C) and the pipe is qualified at that temperature, not at 0°C. Heavier-wall, higher-grade pipe (X70 and above) also carries a DWTT requirement per API 5L Annex G.
Why Buyers Choose CREATEEL
Four reasons this page turns into purchase orders.
Four Routes, One Supplier
Seamless, HFW, LSAW and SSAW — we quote the economically correct route for your diameter and wall, not the one we happen to make.
Complete Certification
EN 10204 3.1/3.2, full heat traceability, HIC/SSC packages for sour service, and third-party inspection welcomed at every stage.
Coating One-Stop
3PE, 3LPP, single and dual FBE plus field-joint systems — coated and documented by the same team that certifies the steel.
Export-Ready Logistics
Container and break-bulk programmes, 12 m or double-random lengths, bevel protectors and packing documented for European and Gulf ports.
Related CREATEEL Products
Every product in the oil & gas chain has its own certified range page on this site.
Ready to Order Oil & Gas Line Pipe?
Get a competitive quote within 24 hours. Our engineers will come back with a route-optimised offer, coating options and the full certification scope for your pipeline project.
[email protected] | 
+86 15602135951 | 
WhatsApp Available