Seamless Line Pipe
API 5L / ISO 3183 Seamless Line Pipe
Hot-finished or cold-drawn seamless pipe for high-pressure transmission of crude oil, natural gas, and refined products. No weld seam. Superior integrity for critical and high-consequence service.
| Specification | Details |
|---|---|
| Standard | API 5L (PSL1 & PSL2), ISO 3183 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65, X70, X80 |
| OD Range | 2-3/8″ (60.3mm) to 26″ (660mm) |
| Wall Thickness | SCH 10 to SCH 160, XXS, and custom WT |
| Length | SRL (Single Random), DRL (Double Random), and cut-to-length |
| End Finishes | Plain End (PE), Beveled End (BE), Threaded & Coupled (T&C) |
| Sour Service | Available with HIC/SSC testing per NACE TM0284 / NACE MR0175 |
| Manufacturing Process | Hot Finished (HF) or Cold Drawn (CD) |
Seamless Line Pipe
Typical Applications:
- High-pressure gas transmission lines
- Offshore risers and flowlines
- Refinery process piping (large bore)
- Steam injection lines (thermal EOR)
- Sour gas gathering systems
2. ERW (Electric Resistance Welded) Line Pipe
API 5L ERW Line Pipe
Longitudinally welded pipe formed from hot-rolled coil using electric resistance welding. Cost-effective option for low to medium pressure applications.
API 5L ERW Line Pipe
| Specification | Details |
|---|---|
| Standard | API 5L (PSL1 & PSL2), ISO 3183 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65 |
| OD Range | 2-3/8″ (60.3mm) to 24″ (610mm) |
| Wall Thickness | Up to 22mm (0.866″) |
| Length | SRL, DRL, up to 24m for select sizes |
| End Finishes | Plain End, Beveled End |
| Weld Seam | Normalized weld seam (post-weld heat treatment optional) |
| Inspection | Ultrasonic (UT) or eddy current weld seam inspection |
ERW vs. Seamless Decision Guide:
| Factor | ERW | Seamless |
|---|---|---|
| Cost | Lower | Higher |
| Max OD | Up to 24″ | Up to 26″ |
| High Pressure | Suitable with proper grade/WT | Preferred for highest integrity |
| Sour Service | Available (HIC-tested) | More common |
| Lead Time | Shorter | Longer |
3. LSAW (Longitudinal Submerged Arc Welded) Line Pipe
API 5L LSAW Line Pipe (Also Known as JCOE or UOE)
Manufactured from heavy steel plate formed into a cylinder with a single longitudinal weld. The predominant choice for large-diameter, high-pressure trunk pipelines.
| Specification | Details |
|---|---|
| Standard | API 5L (PSL1 & PSL2), ISO 3183 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65, X70, X80, X100 |
| OD Range | 16″ (406mm) to 56″ (1422mm) and larger |
| Wall Thickness | 6mm to 65mm |
| Length | Typically 12m to 18m (up to 24m for select diameters) |
| Forming Process | UOE, JCOE, or 3-roll bending |
| Weld Seam | Inside and outside submerged arc welded, ultrasonically inspected |
| End Finishes | Beveled End (30° per API 5L) |
Typical Applications:
- Cross-country oil and gas trunk lines
- Gas export pipelines
- Water injection pipelines (large diameter)
- Subsea export lines
4. SSAW (Spiral Submerged Arc Welded) Line Pipe
API 5L SSAW / HSAW Line Pipe
Manufactured by spirally winding hot-rolled coil and welding the seam with submerged arc process. Economical for large-diameter, lower-pressure applications and water pipelines.
| Specification | Details |
|---|---|
| Standard | API 5L (PSL1 & PSL2), ISO 3183 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65, X70 |
| OD Range | 8″ (219mm) to 100″ (2540mm) |
| Wall Thickness | 5mm to 25mm |
| Length | Typically 12m (extendable by welding) |
| Weld Seam | Continuous spiral, inside and outside SAW |
| Inspection | Full UT of weld seam, X-ray optional |
Typical Applications:
- Water injection and disposal lines
- Low-pressure gathering lines
- Piling and structural pipe
- Cooling water lines
- Slurry and tailings pipelines (oil sands)
5. Sour Service Line Pipe
API 5L Annex H Sour Service Line Pipe
Specially manufactured and tested line pipe for wet H2S (sour) environments. Includes HIC and SSC testing per NACE standards for upstream sour gas and crude pipelines.
| Specification | Details |
|---|---|
| Standard | API 5L Annex H, ISO 3183, NACE MR0175 / ISO 15156 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65 |
| Manufacturing Type | Seamless, HFW/ERW, LSAW (per project spec) |
| Key Testing | HIC per NACE TM0284 (CLR, CTR, CSR), SSC 4-point bend per NACE TM0177, Hardness testing (max 248 HV10 / 22 HRC) |
| Chemistry | Ultra-low sulfur (≤0.002% S), calcium treated, clean steel practice |
| Documentation | Full HIC/SSC test reports with each heat |
HIC Test Acceptance Criteria (Typical):
| Parameter | Standard Limit | Stringent Limit |
|---|---|---|
| Crack Length Ratio (CLR) | ≤ 15% | ≤ 5% |
| Crack Thickness Ratio (CTR) | ≤ 5% | ≤ 2% |
| Crack Sensitivity Ratio (CSR) | ≤ 2% | ≤ 0.5% |
Typical Applications:
- Sour gas gathering and trunk lines
- Pre-flash and inlet separation piping
- Amine unit feed lines
- Produced water with dissolved H2S
6. HFW (High-Frequency Welded) Line Pipe
API 5L HFW Line Pipe
A refined form of ERW pipe using high-frequency induction welding. Produces a narrower, more consistent heat-affected zone (HAZ) than traditional ERW. Increasingly preferred for upstream gathering lines.
| Specification | Details |
|---|---|
| Standard | API 5L (PSL1 & PSL2), ISO 3183 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65, X70 |
| OD Range | 2-3/8″ to 24″ |
| Wall Thickness | Up to 20mm |
| Weld Seam | High-frequency induction welded, normalized |
| Inspection | Full-body UT for weld seam and HAZ, optional phased array |
| Advantage | Tighter dimensional tolerance, cleaner weld profile vs. traditional ERW |
7. Pipe Coatings & Linings
External Coatings and Internal Linings for Line Pipe
Protective systems applied to prevent external corrosion (soil, water, atmosphere) and internal corrosion (process fluids, deposits). We coordinate coating application at certified facilities.
External Coatings:
| Coating Type | Abbreviation | Typical Thickness | Max Service Temp | Common Application |
|---|---|---|---|---|
| 3-Layer Polyethylene | 3LPE | 2.0 – 3.5mm | 60°C – 80°C | Buried onshore pipelines |
| 3-Layer Polypropylene | 3LPP | 2.0 – 3.5mm | Up to 110°C (140°C short-term) | High-temperature, offshore, deepwater |
| Fusion Bonded Epoxy | FBE | 300 – 500 microns | 80°C – 100°C | Buried and above-ground pipelines |
| Dual-Layer FBE | D-FBE | 500 – 1000 microns | Up to 100°C | Enhanced damage resistance |
| Coal Tar Enamel | CTE | 3.0 – 5.0mm | 60°C | Legacy pipeline systems, water lines |
| Concrete Weight Coating | CWC | 25 – 150mm (varies) | N/A | Subsea stability, river crossings |
| Polyurethane | PU | 1.0 – 2.0mm | Up to 100°C | Offshore risers, field joints |
Internal Coatings / Linings:
| Coating Type | Typical Thickness | Application |
|---|---|---|
| Liquid Epoxy | 50 – 150 microns | Internal corrosion protection, flow improvement |
| FBE (Internal) | 150 – 300 microns | Standard internal lining for gas and water |
| Glass Flake Epoxy | 400 – 600 microns | Enhanced barrier for corrosive fluids |
| Cement Mortar Lining | 6 – 15mm | Water injection and cooling water lines |
| HDPE Liner | 3 – 12mm | Abrasive and highly corrosive service |
| PTFE / Teflon | 0.05 – 0.5mm | Extreme chemical resistance, small bore |
8. Line Pipe Accessories
Components for Pipeline Construction and Integrity
Essential accessories for field joint coating, pipe handling, and pipeline testing.
| Category | Items |
|---|---|
| Field Joint Coatings | Heat shrink sleeves (HSS), liquid epoxy kits, field-applied FBE, visco-elastic wrap, petrolatum tape |
| Pipe Protection | Pipe end protectors (plastic and steel), thread protectors, pipe caps, bevel protectors |
| Sacrificial Anodes | Magnesium anodes (soil), zinc anodes (seawater), aluminum anodes (offshore) |
| Pipeline Test Equipment | Test caps, weld test caps, hydrostatic test fittings |
| Pipe Marking & Traceability | Heat number transfer, pipe tally sheets, coating trace-back records |
| Pipeline Pigs (Utility) | Foam pigs, mandrel pigs, batching pigs, gauging plates |
Quick Reference: Which Line Pipe Type for Which Application?
| Application | Recommended Pipe Type | Typical Grade |
|---|---|---|
| High-pressure gas trunk line | LSAW or Seamless | X65 – X80 |
| Crude oil transmission | LSAW or Seamless | X52 – X70 |
| Sour gas gathering | Seamless (Sour Service) | X52 – X65 (HIC tested) |
| Offshore riser | Seamless | X60 – X70 |
| Water injection | SSAW or ERW | Grade B – X52 |
| Flowlines (small bore) | Seamless or HFW | X42 – X65 |
| Low-pressure gathering | ERW or SSAW | Grade B – X52 |
| Subsea export line | LSAW or Seamless | X65 – X70 |
| Piling / Structural | SSAW | Grade B – X52 |