Pipes & Tubes
Supplier in Qatar
Valiol Trading supplies certified carbon steel, stainless steel, seamless, ERW, duplex, alloy steel and specialty pipes to QatarEnergy contractors, Ras Laffan Industrial City, North Field projects and offshore rigs — in stock in Doha with same-week delivery.
Certified Industrial Pipes & Tubes
Supplier — Doha, Qatar
Valiol Trading is a trusted industrial pipes and tubes supplier headquartered in Doha, Qatar. We stock and supply the full range of industrial pipes — from API 5L carbon steel line pipes and ASTM A106 process pipes to stainless steel, duplex, alloy steel, and specialty alloy tubes — all with full MTC 3.1 certification and material test reports for Qatar projects.
Our pipe range serves Qatar's oil & gas upstream, midstream and downstream operations, QatarEnergy EPC contractors, Ras Laffan Industrial City plants, North Field expansion projects, offshore installations, and construction clients across the country.
- Sizes from ¼″ NPS to 72″ NPS — large diameter available on request
- Seamless and welded (ERW, LSAW, SSAW) in standard & custom wall schedules
- SRL and DRL lengths; custom cut-to-length available from Doha stock
- QatarEnergy and Ras Laffan operator AVL / vendor pre-qualification support
- API, ASTM, ISO and NACE MR0175 certified for all Qatar service conditions
- 4-hour RFQ response — competitive pricing direct from approved global manufacturers
International Standards & Specifications
Industrial Pipe Types for Qatar Projects
From standard API 5L carbon steel line pipe to exotic nickel alloys for subsea and sour service — every pipe type required for Qatar's oil & gas and industrial projects, in stock in Doha.
Carbon Steel Pipes
The most widely used industrial pipe for Qatar's oil & gas transmission, gathering, and process piping. Available in seamless and welded (ERW/LSAW) construction. API 5L PSL2 with NACE compliance available for sour service North Field and offshore Qatar projects.
Stainless Steel Pipes
Superior corrosion resistance for Qatar's offshore, chemical, and high-temperature applications. Grades 304L, 316L, 317L, 321, and 347 in seamless and welded construction. ASTM A312 certified with 3.1 MTC for Ras Laffan and QatarEnergy projects.
Seamless Pipes
No weld seam — uniform wall thickness and full-body strength. Mandatory for high-pressure, high-temperature, and sour service (NACE MR0175) applications on Qatar's North Field gas systems, Ras Laffan refineries, and offshore installations.
Alloy Steel Pipes
Chrome-molybdenum alloy steel pipes for high-temperature Qatar service — boiler piping, superheaters, heat exchangers, HRSG, and power generation facilities. ASTM A335 P11, P22, and P91 for Qatar's industrial utility plants.
Duplex & Super Duplex
Premium choice for Qatar's offshore, subsea, and high-chloride environments. Duplex 2205 (S31803) and super duplex 2507 (S32750) — twice the strength of 316L with superior pitting resistance. NACE MR0175 compliant for sour gas Qatar service.
Specialty & Non-Metallic Pipes
Nickel alloy (Inconel 625, Hastelloy C276, Monel 400), HDPE, fibreglass GRE/GRP, copper, and cupro-nickel pipes for specialised service environments across Qatar's chemical, desalination, and offshore sectors.
Pipe Manufacturing Types We Supply
Seamless (SMLS)
No weld seam. Hot-extruded billet. Uniform strength throughout. NACE MR0175 compliant.
ERW Welded
Electric Resistance Welded. Longitudinal seam. Cost-effective for low-pressure Qatar water & gas lines.
LSAW Large Diameter
Longitudinal Submerged Arc Welded. 20″–72″. North Field trunk pipelines & offshore risers.
SSAW Spiral Welded
Spiral Submerged Arc Welded. Large diameters for water injection & low-pressure Qatar lines.
EFW / SAW Welded
Electric Fusion Welded. Heavy-wall large bore for Qatar high-pressure pipeline spools.
Complete Pipe Specifications — Qatar Stock
Detailed specification tables for every pipe category stocked in Qatar. All products come with EN 10204 3.1 MTC, third-party inspection options, and same-week Doha delivery. Contact us for current pricing and availability.
Carbon Steel Pipes — Seamless & Welded
Carbon steel pipes are the backbone of Qatar's oil & gas transmission and process piping. We supply API 5L, ASTM A106, ASTM A53, and ASTM A333 in seamless and welded (ERW/LSAW) construction with full PSL1 and PSL2 options for Qatar projects.
| Pipe Type | Standard / Grade | Sizes (NPS) | Wall Schedule | End Finish | Delivery Form | Qatar Application |
|---|---|---|---|---|---|---|
| CS Seamless Line Pipe | API 5L Gr.B, X42, X52, X60, X65, X70 PSL1/PSL2 | ½″ – 24″ | SCH 40, 80, 120, 160, STD, XS, XXS | PE, BE, TBE | SRL / DRL / Cut to Length | Qatar gas transmission, North Field gathering |
| CS Seamless Process Pipe | ASTM A106 Grade B & C | ½″ – 24″ | SCH 40, 80, 120, 160, XXS | PE, BE, TBE | SRL / DRL / Cut to Length | Ras Laffan refineries, high-temp process piping |
| CS Welded & Seamless Pipe | ASTM A53 Gr.A & B (Type S/E/F) | ½″ – 26″ | SCH 40, 80, STD, XS | PE, BE, TBE, Grooved | SRL / DRL / Cut to Length | General service, water, steam, Qatar fire protection |
| CS Low-Temperature Seamless | ASTM A333 Grade 1, 6 | ½″ – 24″ | SCH 40, 80, 120, 160 | PE, BE | SRL / DRL | Qatar LNG trains, cryogenic North Field service |
| CS Line Pipe — Sour Service | API 5L PSL2 + NACE MR0175 | 2″ – 24″ | SCH 40, 80, XS | PE, BE | SRL / DRL | Qatar H₂S sour service, acid gas, North Field |
| CS ERW Pipe | API 5L Gr.B, X42 PSL1 / ASTM A53 | 2″ – 24″ | SCH 20, 30, 40, 80, STD | PE, BE | SRL / DRL | Qatar water injection, low-pressure gas lines |
| Large Diameter CS Pipe (LSAW/SSAW) | API 5L X52–X70 PSL2 | 20″ – 72″ | Custom WT | BE | Factory lengths | Qatar trunk pipelines, offshore risers, North Field |
Stainless Steel Pipes & Tubes
Stainless steel pipes for Qatar's corrosive, offshore, chemical, and hygienic applications. All austenitic grades in seamless and welded construction with ASTM certification and EN 10204 3.1 MTC for QatarEnergy contractor supply.
| Grade / Type | Standard | UNS No. | Sizes (NPS) | Wall Schedule | Construction | Key Properties | Qatar Application |
|---|---|---|---|---|---|---|---|
| SS 304 / 304L | ASTM A312 | S30400 / S30403 | ¼″ – 36″ | SCH 5S – 80S | Seamless & Welded | General corrosion resistance, weldable | Qatar general process, water, food industry |
| SS 316 / 316L | ASTM A312 | S31600 / S31603 | ¼″ – 36″ | SCH 5S – 80S | Seamless & Welded | Superior chloride resistance (Mo content) | Qatar offshore, marine, Ras Laffan chemical |
| SS 317L | ASTM A312 | S31703 | ½″ – 24″ | SCH 10S – 40S | Seamless & Welded | Higher Mo — enhanced corrosion resistance | Qatar acid environments, chemical plants |
| SS 321 | ASTM A312 | S32100 | ½″ – 24″ | SCH 10S – 80S | Seamless & Welded | Ti-stabilised, sensitisation resistant | Qatar high-temperature exhaust, refinery |
| SS 347 / 347H | ASTM A312 | S34700 | ½″ – 20″ | SCH 10S – 80S | Seamless & Welded | Nb-stabilised, high-temp strength | Qatar power generation, HP steam lines |
| SS Instrumentation Tube | ASTM A269 / A213 | S30400, S31600 | ¼″ – 4″ OD | 0.035″ – 0.500″ WT | Seamless, BA finish | High precision, smooth bore | Qatar instrumentation, hydraulics, heat exchangers |
Duplex & Super Duplex Stainless Steel Pipes
Duplex and super duplex grades combine high strength with outstanding corrosion resistance — the preferred choice for Qatar's offshore, subsea, and high-chloride environments. NACE MR0175 compliant for sour gas service.
| Grade | UNS No. | Standard | PREN | Sizes (NPS) | Wall Schedule | Tensile Strength | Qatar Application |
|---|---|---|---|---|---|---|---|
| Duplex 2205 | S31803 / S32205 | ASTM A790 / A928 | 35 | ½″ – 24″ | SCH 10S – 80S | 620 MPa min | Qatar seawater, Ras Laffan desalination, chemical |
| Super Duplex 2507 | S32750 | ASTM A790 / A928 | 43 | ½″ – 16″ | SCH 10S – 80S | 795 MPa min | Qatar deep offshore, subsea, sour gas service |
| Super Duplex 255 (Ferralium) | S32550 | ASTM A790 | 41 | ½″ – 12″ | SCH 10S – 40S | 760 MPa min | FGD systems, marine, Qatar pump shafts |
| Lean Duplex LDX 2101 | S32101 | EN 10216-5 | 26 | 2″ – 24″ | SCH 10S – 40S | 650 MPa min | Qatar water treatment, low-budget duplex applications |
Alloy Steel Pipes — High-Temperature & High-Pressure
Chrome-molybdenum alloy steel pipes for Qatar's high-temperature service — power generation, refineries, HRSG, and Ras Laffan petrochemical plants. All grades seamless to ASTM A335.
| Grade | Standard | Composition (Cr-Mo) | Max Service Temp | Sizes (NPS) | Tensile Strength | Qatar Application |
|---|---|---|---|---|---|---|
| P1 | ASTM A335 | 0.5% Mo | 400°C / 752°F | ½″ – 24″ | 415 MPa | Qatar boiler piping, utility steam |
| P5 / P5b / P5c | ASTM A335 | 5% Cr – 0.5% Mo | 620°C / 1148°F | ½″ – 24″ | 415 MPa | Qatar hydro-cracker, reformer piping |
| P9 | ASTM A335 | 9% Cr – 1% Mo | 650°C / 1202°F | ½″ – 24″ | 415 MPa | Qatar high-temp refinery, steam headers |
| P11 | ASTM A335 | 1.25% Cr – 0.5% Mo | 540°C / 1004°F | ½″ – 24″ | 415 MPa | Qatar power plant boiler tubes, superheaters |
| P22 | ASTM A335 | 2.25% Cr – 1% Mo | 580°C / 1076°F | ½″ – 24″ | 415 MPa | Qatar HRSG, heat exchangers, power generation |
| P91 | ASTM A335 | 9% Cr – 1% Mo – V/Nb | 650°C / 1202°F | ½″ – 24″ | 585 MPa | Qatar ultra-supercritical power, HP steam |
Specialty, Nickel Alloy & Non-Metallic Pipes
Beyond traditional steel, Valiol Trading supplies nickel alloys, HDPE, fibreglass GRE/GRP, copper, and cupro-nickel pipes for extreme-service and non-metallic applications across Qatar's energy and infrastructure sectors.
| Pipe Type | Material / Grade | Standard | Size Range | Key Advantages | Qatar Application |
|---|---|---|---|---|---|
| Nickel Alloy Pipe | Inconel 625, Hastelloy C276, Monel 400, Incoloy 825 | ASTM B163 B167 | ½″ – 12″ | Extreme corrosion resistance, high-temp | Qatar acid gas, sour service, chemical processing |
| HDPE Pipe | PE 80 / PE 100 (Black) | ASTM D3035 ISO 4427 | ½″ – 63″ | Lightweight, corrosion-free, flexible | Qatar water injection, produced water, saltwater disposal |
| GRE / GRP Fibreglass Pipe | Glass Reinforced Epoxy / Polyester | API 15HR AWWA C950 | 1″ – 72″ | Lightweight, no cathodic protection needed | Qatar seawater cooling, desalination, chemical injection |
| Copper Pipe | C10200 / C12200 | ASTM B88 | ¼″ – 8″ | Excellent thermal conductivity, antimicrobial | Qatar HVAC, medical gas, gas transportation |
| Cupro-Nickel Pipe | Cu-Ni 70/30, 90/10 (C70600, C71500) | ASTM B466 | ½″ – 12″ | Outstanding seawater corrosion resistance | Qatar seawater cooling, offshore condensers |
| Galvanised Steel Pipe | Carbon Steel + Hot-Dip Zinc | ASTM A53 + ASTM A123 | ½″ – 8″ | Corrosion protection, long service life | Qatar water service, fire protection, scaffolding |
Pipe Schedule & Wall Thickness Reference
Standard pipe schedule (wall thickness) designation for commonly ordered NPS sizes. All schedules available in Qatar stock. Contact us for specific wall thickness requirements for your Qatar project.
| NPS | OD (in) | SCH 10 | SCH 20 | SCH 40 (STD) | SCH 80 (XS) | SCH 120 | SCH 160 | XXS |
|---|---|---|---|---|---|---|---|---|
| ½″ | 0.840 | — | — | 0.109 | 0.147 | — | 0.188 | 0.294 |
| 1″ | 1.315 | — | — | 0.133 | 0.179 | — | 0.250 | 0.358 |
| 2″ | 2.375 | 0.109 | — | 0.154 | 0.218 | 0.344 | 0.344 | 0.436 |
| 3″ | 3.500 | 0.120 | — | 0.216 | 0.300 | 0.438 | 0.438 | 0.600 |
| 4″ | 4.500 | 0.120 | — | 0.237 | 0.337 | 0.438 | 0.531 | 0.674 |
| 6″ | 6.625 | 0.134 | — | 0.280 | 0.432 | 0.562 | 0.719 | 0.864 |
| 8″ | 8.625 | 0.148 | 0.250 | 0.322 | 0.500 | 0.594 | 0.719 | 0.875 |
| 10″ | 10.75 | 0.165 | 0.250 | 0.365 | 0.500 | 0.594 | 0.719 | 1.000 |
| 12″ | 12.75 | 0.180 | 0.250 | 0.406 | 0.500 | 0.688 | 0.844 | 1.000 |
| 14″ | 14.00 | 0.188 | 0.250 | 0.375 | 0.500 | 0.750 | 0.938 | — |
| 16″ | 16.00 | 0.188 | 0.250 | 0.375 | 0.500 | 0.844 | 1.031 | — |
| 20″ | 20.00 | 0.218 | 0.250 | 0.375 | 0.500 | — | — | — |
| 24″ | 24.00 | 0.250 | 0.250 | 0.375 | 0.500 | — | — | — |
End Preparation, Lengths & Documentation
All pipes are available in standard end configurations and lengths. Full mill documentation included as standard for Qatar project compliance.
| Category | Option | Description / Details |
|---|---|---|
| End Preparation | PE — Plain End | Cut square, no bevelling. For socket weld or threaded connections on Qatar instrument piping. |
| BE — Bevelled End | 30° bevel, 1.6mm root face per ASME B16.25. Standard for all Qatar butt weld applications. | |
| TBE — Threaded Both Ends | NPT or BSP thread. For screwed fittings and small-bore Qatar utility systems. | |
| TOE — Threaded One End | One end threaded, one plain end. | |
| Grooved End | Victaulic/Gruvlok groove. Qatar fire protection, HVAC and utility systems. | |
| Pipe Lengths | SRL — Single Random Length | 16–22 ft (4.8m–6.7m) per API 5L and ASTM standards. |
| DRL — Double Random Length | 35–45 ft (10.7m–13.7m). Most common for Qatar bulk projects. | |
| Mill Length | Typically 5.8m, 6m, or 12m depending on product. | |
| Cut to Length | Custom cut lengths from Doha stock. Minimum order may apply. | |
| Documentation | Mill Test Certificate (MTC) | Chemical composition, mechanical properties, heat number. EN 10204 3.1 standard. |
| Material Test Report (MTR) | Full test results per heat per product. 3.1 and 3.2 available for QatarEnergy EPC requirements. | |
| Inspection Release Note (IRN) | Final inspection confirmation prior to despatch from Qatar or origin. | |
| Packing List / Delivery Note | Heat numbers, sizes, lengths, weights — per Qatar customs documentation requirements. | |
| 3rd Party Inspection | SGS, Bureau Veritas, Intertek, or QatarEnergy-nominated inspector available. | |
| Certificate of Origin | Country of manufacture certificate for Qatar import and trade compliance. |
Pipe Standards for Qatar Projects
All pipes supplied by Valiol Trading comply with the international standards required by QatarEnergy, Ras Laffan operators, and Qatar EPC engineering specifications.
Specification for Line Pipe — oil, gas & water transmission. Grades B through X70, PSL1 and PSL2. Backbone of Qatar gas pipelines.
Seamless Carbon Steel Pipe for High-Temperature Service. Primary spec for Qatar refinery and petrochemical process piping. Grade B most common.
Seamless, Welded Austenitic Stainless Steel Pipes. Covers all 304, 316, 321, 317L, and 347 grades for Qatar corrosive service.
Ferritic/Austenitic Stainless Steel Pipe — duplex 2205 (S31803) and super duplex 2507 (S32750) for Qatar offshore and sour service.
Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service. Covers all Cr-Mo grades P1 through P91 for Qatar power and refinery.
Welded and Seamless Wrought Steel Pipe — primary dimensional standard defining all NPS sizes and wall schedules for Qatar projects.
Stainless Steel Pipe — dimensional standard for stainless, duplex and high-alloy pipes. Covers 5S, 10S, 40S, 80S schedules.
Materials for H₂S Environments — mandatory for Qatar North Field sour gas, offshore, and acid gas applications. ISO 15156 compliant.
Applications Across Qatar's Energy Sector
Valiol Trading's pipes and tubes supply Qatar's most critical oil & gas, petrochemical, power and infrastructure projects.
Oil & Gas — Upstream Qatar
API 5L line pipe, NACE MR0175 sour service pipe for Qatar wellhead connections, gathering lines, and North Field production facilities.
Ras Laffan Refineries
ASTM A106 process pipe, alloy steel P5/P11/P22/P91 for Ras Laffan high-temp refinery CDU/VDU, hydrotreaters, and reformers.
Qatar EPC & Pipeline Projects
Bulk API 5L X52–X70 line pipe for Qatar transmission pipelines, compressor stations, metering facilities, and pig launchers.
Qatar Power Generation
Alloy steel ASTM A335 P91 and stainless A312 for Qatar boiler piping, superheaters, HRSG, and turbine exhaust systems.
Qatar Desalination & Water
Duplex 2205, HDPE, and GRE/GRP pipes for Qatar seawater intake, MSF/RO desalination plants, and water injection systems.
Qatar LNG Trains
ASTM A333 Grade 6 and 9% Ni seamless pipe for Qatar's North Field LNG liquefaction trains — cryogenic service down to –196°C.
Offshore & Marine Qatar
Super duplex S32750, cupro-nickel, and titanium pipes for Qatar offshore topside piping, subsea, and marine cooling systems.
Mesaieed Petrochemical
SS 316L, duplex, super duplex, and nickel alloy pipes for Qatar aggressive chemical service — acid lines, chloride, and HP reactors.
Qatar Construction & Infrastructure
Black steel and galvanised pipes for structural, fire protection, HVAC, gas distribution across Doha construction projects.
Value-Added Services for Qatar
Valiol Trading provides value-added services to enhance pipe products and reduce project preparation time for Qatar EPC contractors and operators.
Cutting & Bevelling
Cut-to-length and 30° weld-prep bevel to ASME B16.25. Reduces on-site preparation and ensures correct weld fit-up for Qatar project installations.
Heat Treatment
Normalising, annealing, stress relieving, and PWHT through approved partners. Enhances strength and corrosion resistance for Qatar critical service.
Coating & Lining
External epoxy, FBE, 3LPE, and polyurethane coatings. Internal cement mortar and epoxy linings for Qatar buried and submerged piping.
Threading (NPT/BSP)
NPT and BSP threading to ANSI/ASME B1.20.1 for small-bore and Qatar instrumentation connections. TBE and TOE configurations available.
NDT & Inspection
Ultrasonic testing (UT), magnetic particle inspection (MPI), radiographic (RT), and hydrostatic testing through Qatar-approved inspection network.
PMI — Positive Material Identification
XRF-based PMI testing for alloy verification — essential for stainless, duplex, and alloy pipes in Qatar sour service and chemical applications.
Pipes & Tubes
FAQ — Qatar
Questions from Qatar-based engineers and procurement teams about our pipe supply range.
Ask Our Engineers →Related Products for Your Project
Pipe Fittings — Qatar
ASME B16.9 BW, B16.11 forged, socket weld, threaded & MSS SP-97 branch fittings. Doha stock.
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Flanges & Gaskets
ASME B16.5, API 6A — WN, SO, BL, RTJ. Class 150–2500. Qatar stock with MTC 3.1.
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Industrial Valves Qatar
Gate, ball, globe, check, butterfly. API 6D / API 600. Class 150–2500. Same-week Doha delivery.
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Structural Steel & Sections
I-beams, hollow sections, angles & plates. S275/S355, A36. Qatar construction & industrial stock.
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