Spiral steel pipe, anti-corrosion steel pipe, socket steel pipe, and pile foundation steel pipe 

Top 10 FAQ for Water Conservancy Spiral Steel Pipe

Water Conservancy Spiral Steel Pipe, SSAW process, for fluid conveyance in water projects. Applications: long-distance water transmission, urban water supply, sewage/drainage, agricultural irrigation, flood control, reservoir diversion, seawater desalination, power plant circulating water. Types: pressure pipe, gravity drainage pipe, irrigation pipe, flood control pipe.

Large diameter water conservancy spiral pipe. OD 219-3600mm (DN200-DN3600), WT 6-30mm, extra large OD/heavy WT customizable. Standard length 12m/18m, up to 30m extra-long single pipe to reduce field welds and leakage risk. Single pipe weight up to tens of tons.

Standards: AWWA C200 (steel water pipe), C203 (cement mortar lining), C210 (liquid epoxy lining), C213 (FBE external), API 5L PSL1/2, ASTM A53, EN 10217, ISO 2531, GB/T 9711. Hold ISO 9001/14001/45001, Special Equipment License. National High-tech Enterprise. Internal coatings: NSF/ANSI 61, WRAS, ACS drinking water certified.

100% per-pipe hydrostatic test (5-10s hold, traceable curve). Welds 100% UT; RT for critical projects. Internal coating: thickness (min. 5 sections/pipe), smoothness, hollow tapping, holiday detection (epoxy). External coating: thickness, 100% holiday detection, adhesion. 25 NDT sets. MTC EN 10204 3.1 + coating reports per batch.

Internal coatings: cement mortar lining (AWWA C203, most economical, 6-10mm by diameter), liquid epoxy (AWWA C210, smooth low-friction, reduces head loss), IPN8710 drinking water (non-toxic), FBE internal. Drinking water coatings: NSF/ANSI 61, WRAS, ACS certified. Factory-prefabricated and cured, direct on-site installation.

Standard specs: 7-15 days; bulk: 15-30 days; integrated (internal + external coating): 15-25 days. Large-diameter pipe shipped by bulk carrier or flat rack container; smaller OD fits standard containers. Exported to ~50 countries (Middle East, SE Asia, Africa, Central Asia), applied in water supply, sewage, irrigation, water diversion. Self-operated import/export rights, full English export docs, SGS/BV/TÜV third-party surveillance supported.

External coatings: 3PE/2PE (DIN 30670/ISO 21809-1, buried mainstream), FBE (AWWA C213/ISO 21809-2), coal tar epoxy (SY/T 0447, economical buried), hot-dip galvanizing (small OD). Buried: 3PE reinforced + CP recommended; above-ground: FBE or polyurethane. Factory-prefabricated, 4 3PE + 2 FBE lines, one-stop pipe + internal + external coating delivery.

Highly customizable per drawings/specs: special OD/WT/length, steel grade, internal coating type/thickness, external coating type/grade, pipe end (bevel/socket & spigot/flange), stiffener rings, guide rings, cutting marks. Small-batch multi-spec customization, adaptable to geology, pressure and water quality. One-stop delivery: pipe + internal + external coating + pipe end fabrication.

Joint methods: butt weld (most common, 30°/35° V-bevel, field extension), socket & spigot push-on (rubber gasket sealed, fast install, water supply/drainage), flanged (easy disassembly/valve connection). Large-diameter long-distance: butt weld + internal coating field joint repair; municipal networks: socket & spigot fast install. Pipe ends prefabricated per customer requirements.

Priced per ton by OD, WT, steel grade, internal coating, external coating, pipe end fabrication and quantity. Large-diameter pipe settled by actual weight. Cement mortar internal lining most economical; liquid epoxy/FBE higher cost. Trade terms: FOB (Tianjin/Huanghua) or EXW. Bulk tiered discounts, quote validity 7-15 days.

Top 10 FAQ for Oil & Gas Spiral Steel Pipe

Oil & Gas Spiral Steel Pipe, SSAW process, API 5L compliant, for oil & gas fluid conveyance. Applications: long-distance crude oil/gas transmission trunk lines, field gathering lines, city gas distribution, product pipelines, LNG terminal/regasification, refinery process lines, offshore pipelines, interconnection projects. Types: gas line pipe, oil line pipe, gathering pipe, station pipe.

OD 219-3600mm (DN200-DN3600), WT 6-30mm, large OD/heavy WT customizable. Standard length 12m/18m, up to 30m extra-long single pipe to reduce field welds (fewer welds = lower leakage risk for trunk lines). PSL2 stricter tolerances: OD ±0.5%, WT -5%~+15%, straightness ≤0.15%. Single pipe weight up to tens of tons.

Standards: API 5L PSL1/2 (most authoritative), ISO 3183 (equivalent to API 5L), ASTM A53/A106, EN 10217-1, GB/T 9711. Steel grades: API 5L Gr.B (A25/A283), X42, X46, X52, X56, X60, X65, X70, X80 (high-strength customizable). PSL2 stricter than PSL1: heat + product analysis chemistry, Charpy impact, DWTT, metallographic examination. Hold API 5L monogram license.

Priced per ton by OD, WT, steel grade (X70/X80 higher cost), PSL level (PSL2 10-15% > PSL1), external coating (3PP > 3PE), internal coating, special tests (HIC/SCC add cost), quantity. Large OD heavy WT calculated by theoretical weight, settled by actual weight. Trade terms: FOB (Tianjin/Huanghua) or EXW. Bulk tiered discounts, quote validity 7-15 days (steel volatile, price locking recommended for trunk lines).

Internal coatings: cement mortar lining (AWWA C203, most economical, 6-10mm by diameter), liquid epoxy (AWWA C210, smooth low-friction, reduces head loss), IPN8710 drinking water (non-toxic), FBE internal. Drinking water coatings: NSF/ANSI 61, WRAS, ACS certified. Factory-prefabricated and cured, direct on-site installation.

Standard specs: 7-15 days; bulk trunk line: 15-45 days (by quantity); integrated internal + external coating: 15-30 days. Large OD high weight pipe shipped by bulk carrier; smaller OD fits flat rack/standard containers. Exported to ~50 countries: Middle East (UAE, Saudi, Iran, Iraq), Central Asia (Kazakhstan, Turkmenistan, Uzbekistan), SE Asia (Indonesia, Malaysia, Vietnam, Thailand), Africa (Nigeria, Kenya, South Africa), Europe (Russia). Applied in trunk lines, field gathering, city gas, interconnection. Self-operated import/export rights, full English export docs, SGS/BV/TÜV/DNV third-party in-plant surveillance supported (usually required for oil & gas projects).

Internal coatings: drag reduction FBE (smooth low-friction, +5-10% throughput, reduces pumping energy, gas/product pipelines), liquid epoxy (corrosion resistant, sour/acid crude), cement mortar (large-diameter water/sewage). Thickness 250-500μm, surface roughness Ra≤30μm (drag reduction). Factory-prefabricated and cured, uniform dense coating. Adhesion, thickness, pinhole inspection reports available.

Stringent inspection: 100% per-pipe hydrostatic (PSL1 5s, PSL2 10s, traceable curve). 100% weld UT; PSL2: 100% full weld UT + pipe end UT; RT/AUT for critical projects. 100% pipe end MT/PT. PSL2: heat + product analysis chemistry, tensile (yield/tensile/elongation), Charpy V-notch (0°C/-20°C), DWTT (-10°C/-20°C, shear ≥85%), metallographic, hardness. 25 NDT sets. MTC EN 10204 3.1 per batch (PSL2 complete test data).

Precision pipe end: 30°/35° V-bevel (angle ±2.5°, land 1.6mm±0.8mm) for field welding quality. Ovality ≤0.5% OD (PSL2) for fit-up. 100mm end zone inspected by UT + MT/PT (defect-free). Available: plain end, flanged (station pipelines), stiffener ring. Welding: double-sided SAW, reinforcement 0.5-2.5mm, first-pass rate >98%. WPS/PQR and welder qualification certs available.

Highly customizable per project spec: special OD/WT/length, steel grade (X70/X80 high-strength), PSL1/2 level, external coating type/thickness (3PE normal/reinforced/extra reinforced), internal coating (drag reduction FBE/liquid epoxy), pipe end (bevel angle/land/flange), marking (stencil/spray/tag), special tests (HIC/SCC/SSCC sour service). Small-batch multi-spec, adaptable to pressure/temp/medium. One-stop delivery: pipe + coating + pipe end + marking.

Top 10 FAQ for Steel Pipe Pile

Steel Pipe Pile / Piling Tube manufactured by SSAW process, mainly for foundation load-bearing. Applications: bridge piling, port & marine piling, offshore wind power foundations (monopile/jacket), building piling, foundation pit support casing, subway shield casing. Types: friction pile, end-bearing pile, soldier pile, casing pipe.

Large OD, heavy WT piling pipe. OD 219-3600mm (DN200-DN3600), WT 6-30mm, extra heavy WT customizable. Standard length 12m/18m, up to 30m extra-long single pipe to reduce field welds. Single pile weight up to tens of tons, meeting large project load-bearing requirements.

Standards: ASTM A252 (Gr.1/2/3), API 5L PSL1/2 (Gr.B/X42/X52/X60/X65), EN 10219/10210 (S235JR/S275JR/S355JR/S355J2H), GB/T 9711 (L245/L290/L360/L415), ASTM A53 (Gr.B). Customizable per customer specs, meeting load-bearing and toughness requirements.

Standard specs: 7-15 days; bulk: 15-30 days; integrated (end fabrication + coating): 15-25 days. Large OD heavy WT pipe shipped by bulk carrier or flat rack container; smaller OD fits standard containers. Factory in Yanshan, adjacent to Huanghua Port, 200km from Tianjin Port. Services: shipping booking, cargo securing, customs clearance consultation.

Pipe end preparations: plain end, 30°/35° beveled end (field welding extension), stiffener/reinforcement ring (prevents deformation during driving), pile shoe/driving shoe (hard soil/rock driving), flanged joint (segmented transport/assembly). Guide rings, cutting marks fabricable per drawings.

Exported to ~50 countries: Middle East (UAE, Saudi, Iran, Iraq), SE Asia (Vietnam, Philippines, Indonesia, Thailand, Malaysia), Africa (Nigeria, Kenya, South Africa, Tanzania), Central Asia (Kazakhstan, Uzbekistan), Europe (Russia), Latin America (Brazil). Projects: port expansion, sea-crossing bridge piling, offshore wind foundations, subway shield, high-rise piling. Self-operated import/export rights, full English export docs, SGS/BV/TÜV third-party surveillance supported.

Heavy-duty coating for marine environment. External: 3PE/2PE (DIN 30670/ISO 21809-1), FBE (AWWA C213/ISO 21809-2), coal tar epoxy, polyurethane, glass flake. Marine splash zone: concrete weight coating or sacrificial anode CP. Internal: cement mortar, liquid epoxy. Factory-prefabricated, 4 3PE + 2 FBE lines.

100% per-pipe hydrostatic test (5-10s hold, traceable curve). Piling welds 100% UT; RT for critical projects. 25 NDT sets incl. ET. 100% dimensional inspection (OD, roundness, WT, straightness, length), bevel angle/land. Weld first-pass rate >98%. MTC EN 10204 3.1 per batch.

Highly customizable per drawings: special OD/WT/length, stiffener ring position/dimensions, pile shoe type, flange specs, guide rings, cutting marks, coating type/thickness. Small-batch multi-spec customization, adaptable to geological and load-bearing requirements. One-stop delivery: pipe + end fabrication + coating + fittings.

Priced per ton by OD, WT, steel grade, end fabrication (stiffener ring/pile shoe/flange), coating type and quantity. Large OD heavy WT pipe settled by actual weight. Trade terms: FOB (Tianjin/Huanghua Port) or EXW only. Bulk tiered discounts, quote validity 7-15 days.

Top 10 FAQ for Socket & Spigot Steel Pipe

Socket & Spigot Steel Pipe with flexible push-on joint — socket end + spigot end, sealed by rubber gasket. Quick installation without field welding, ideal for municipal water, fire protection and drainage pipelines. Socket & spigot ends fabricated on SSAW or ERW steel pipes.

DN200-DN1200 (OD 219-1220mm), WT 6-20mm, standard length 6m/12m. Socket/spigot dimensions machined to standard tolerances for interchangeability and sealing reliability. Larger diameters (>DN1200) available with customized socket & spigot or flanged joints.

Base material: API 5L, ASTM A53, EN 10217, GB/T 9711. Joint dimensions reference ISO 2531, EN 545/598, AWWA C200 (compatible with ductile iron pipe systems). Hold ISO 9001/14001/45001 triple system, Special Equipment Manufacturing License. National High-tech Enterprise, Provincial "Specialized & Innovative" SME.

Matching socket & spigot fittings: elbows (22.5°/45°/90°), tees, reducers, flange adapters, end caps. Small-batch multi-specification customization supported — special socket dimensions, wall thickness and length fabricated per customer drawings. One-stop delivery: pipe + socket fabrication + coating + fittings, reducing multi-supplier coordination costs and quality risks.

EPDM rubber gaskets, aging/ozone resistant, temperature range -30°C to +120°C, service life ≥50 years. Working pressure PN10-PN40 (1.0-4.0MPa), zero leakage under proper installation. Gaskets comply with ISO 4633, EN 681. Drinking water certifications available: NSF/ANSI 61, WRAS, ACS.

Priced per ton by OD, wall thickness, steel grade, coating type and fittings inclusion. Trade terms: FOB (Tianjin/Huanghua Port) or EXW. Standard specs delivered in 7-15 days, bulk orders 15-30 days. Exported to ~50 countries in Middle East, SE Asia, Africa, Central Asia. Self-operated import/export rights, full English export clearance documents (MTC, inspection reports, certificate of origin).

Internal coating options: cement mortar lining (AWWA C203, most economical), liquid epoxy (AWWA C210, smooth low-friction), IPN8710 drinking water coating (non-toxic), FBE internal coating. Drinking water coatings certified to NSF/ANSI 61, WRAS, ACS. Socket/spigot internal surfaces coated simultaneously.

External coating: 3PE/2PE (DIN 30670/ISO 21809-1), FBE fusion-bonded epoxy powder (AWWA C213/ISO 21809-2), coal tar epoxy, hot-dip galvanizing. Socket/spigot external surfaces specially treated to prevent coating damage during installation. Factory-prefabricated coating, direct on-site installation. 4 3PE lines + 2 FBE lines, one-stop pipe + socket fabrication + coating delivery.

Fast installation without field welding or hot work — single pipe takes only 5-10 minutes, 3-5x faster than welded joints. Simple tools: manual hoist or excavator only for spigot insertion. Angular deflection ±3° to ±5° to accommodate uneven ground settlement. Self-sealing rubber gasket, pipeline can be hydro-tested immediately after installation — no waiting for weld cooling or coating curing.

100% per-pipe hydrostatic test (5-10s hold, full traceable pressure curve). Socket/spigot dimensions 100% measured for fitting tolerance. Rubber gasket compression rate tested for sealing performance. Weld UT per contract. 25 NDT sets (hydrostatic + UT + RT + ET). MTC EN 10204 3.1 material certificate + coating inspection reports per batch.

Top 10 FAQ for Anticorrosion Steel Pipe (3LPE & FBE)

We offer 3LPE three-layer external coating (FBE primer + adhesive + HDPE) and FBE fusion-bonded epoxy powder coating (single/dual layer ARO). 3LPE: strong adhesion, excellent cathodic disbondment resistance, ideal for oil & gas and buried water pipelines. FBE: 300–500μm (single) for general environments; 600–1000μm (dual/ARO) for rocky terrain and directional drilling crossings.

3LPE: DIN 30670, ISO 21809-1, CSA Z245.21, GB/T 23257. FBE: AWWA C213, ISO 21809-2, NACE SP0394, CSA Z245.20, GB/T 18593. Custom-specified standards accepted for global EPC project bidding.

100% full inspection. 3LPE thickness: Normal 2.5–3.0mm, Reinforced 3.0–3.7mm, Extra Reinforced 3.7–4.5mm. FBE thickness: 300–500μm (single), 600–1000μm (dual). Blast cleaning Sa 2.5, anchor profile 50–100μm, adhesion ≥70N/cm. Holiday detection: 3LPE 15–25kV by grade, FBE 5V/μm. Batch test reports (thickness, adhesion, cathodic disbondment) included.

3LPE field joints: Heat Shrink Sleeve (radiation-crosslinked PE backing + hot melt adhesive), forms continuous sealed layer with pipe body after shrinking. FBE field joints: FBE powder field joint coating (special heating equipment required) or Liquid Epoxy Repair Compound. Materials supplied: heat shrink sleeves, repair patches, epoxy repair compounds. Construction guidance and on-site technical support available; technicians dispatchable when needed.

Oil & gas transmission: 3LPE (≤70°C) + cathodic protection, design life ≥30 years. Municipal water: 3LPE or FBE (AWWA C213). Seawater/marine: reinforced 3LPE or dual-layer FBE (ARO) + sacrificial anode. Buried pipelines: by soil corrosivity — normal soil 3LPE normal grade; saline/marshland 3LPE reinforced/extra reinforced; rocky terrain dual-layer FBE (ARO). High temperature (≤115°C): FBE.

Packaging: Plastic End Caps, woven bags or bubble wrap, steel strap bundling (3–5 pcs/bundle), individual packaging for large-diameter pipes. Handling: Nylon Slings only (steel wire rope directly on coating strictly prohibited), soft spacers between pipes, rubber mats on truck bed; no dragging, rolling or throwing. Damage repair: ≤30mm diameter — epoxy repair compound on-site; major damage — heat shrink sleeve. Re-do holiday detection after repair. Loading/unloading and transportation operation manual provided.

Full in-house process: pipe production (SSAW/ERW/LSAW) + 3LPE/FBE coating. 4 3LPE lines + 2 FBE lines, simultaneous multi-type orders. One-stop service reduces communication costs and quality risks. Factory-prefabricated coating ensures stable quality and direct on-site installation.

Pricing: per m² (π × OD × length) or per ton (pipe + coating integrated). Price level: 3LPE > FBE; dual FBE > single FBE. Final quote by coating thickness, pipe diameter and quantity. Trade terms: FOB (Tianjin/Huanghua), CIF, CFR, DDP. Payment: T/T (30% deposit + 70% before shipment) or irrevocable L/C at sight. Bulk tiered discounts available.

Third-party support: SGS, BV, TÜV, DNV, Intertek — in-plant surveillance and pre-shipment inspection (PSI). Witness full process: incoming material inspection, hydrostatic test, UT/RT, coating thickness, holiday detection, adhesion test. High first-pass rate, third-party reports issued. MTC EN 10204 3.1 included per shipment (chemistry, mechanical, hydrostatic, NDT, coating data).

Coating processing: 3–5 days (standard specs), 7–15 days (bulk orders), 10–20 days (pipe + coating integrated). Rush orders supported with priority production scheduling. Factory in Yanshan, Hebei (China Pipe Equipment Manufacturing Base), adjacent to Huanghua Port, 200km from Tianjin New Port. Standard specs delivered within 7 days.