Piping Spool Fabrication are essential components in modern industrial projects, enabling efficient and high-quality pipeline installation across oil & gas, petrochemicals, LNG, power generation, offshore engineering, pharmaceuticals, and food processing industries. A spool consists of straight pipes, elbows, tees, flanges, and fittings, fully fabricated in a controlled factory environment through precise cutting, beveling, fit-up, welding, NDT, heat treatment, surface finishing, and dimensional verification. Field work is reduced to lifting and bolting, significantly shortening construction time, improving weld quality, and minimizing safety risks.
Key Features
Standards:
Design & Fabrication Standards:
ASME B31.3 (Process Piping)
ASME B31.8 (Gas Transmission Piping)
API 6D / API 5L (Pipeline Valves & Pipes)
ISO 15649 (Petroleum and Natural Gas Industries – Piping Fabrication)
GB/T 20801 (Pressure Piping Code – Industrial Piping)
Welding Standards:
ASME IX (Welding and Brazing Qualifications)
AWS D1.1 (Structural Welding Code – Steel)
ISO 15614 (Welding Procedure Qualification)
Inspection & Testing Standards:
ASME B31.3 Appendix G (Fabricated Piping System Inspection)
API 570 (Piping Inspection Code)
NACE SP0106 / ISO 11121 (Cleaning and Coating of Fabricated Piping)
Materials:
Carbon Steel:
ASTM A106 Gr.B, API 5L Gr.B/X42/X52/X60/X65/X70
ASTM A53 Gr.B (for low-pressure systems)
Low-Alloy Steel:
ASTM A333 Gr.6 (Low-Temperature Carbon Steel)
ASTM A335 P11/P22 (High-Temperature Cr-Mo Steel)
Stainless Steel:
ASTM A312 TP304/304L, TP316/316L, TP321, TP347
Duplex: 2205 (S31803), 2507 (S32750)
Nickel Alloys:
Inconel® 625 (N06625), Hastelloy® C276 (N10276), Monel® 400 (N04400)
Dimensions:
Nominal Diameter (DN): DN15 (1/2") to DN1200 (48")
Wall Thickness: SCH5S to XXS, or custom per API 5L, ASME B36.10M/B36.19M
Length & Weight:
Single Spool Length: 0.5m to 24m (transport-limited)
Single Spool Weight: ≤30 tons (crane & transport dependent)
Configurations:
Straight Spools
Bent Spools
Multi-Axis Complex Spools
With Branch Connections (Weldolet, Sockolet, Threadolet)
Applications:
Oil & Gas: Offshore platform process lines, onshore gathering pipelines, compressor inlets/outlets
LNG Projects: Cryogenic lines (-165°C), BOG recovery systems
Chemical & Petrochemical: Reactor inlets/outlets, heater connections, tower piping
Power Generation: Main steam lines, feedwater systems, drain lines
Offshore Engineering: FPSO modules, subsea manifolds, umbilical systems
Pharmaceutical & Food: High-purity fluid transfer systems (316L EP electropolished)
Certifications & Approvals:
Classification Society Certifications:
ABS, DNV, LR, BV, NK, CCS
Provide Type Approval and Survey Reports per batch
Owner & Engineering Company Approvals:
ISO 9001 Quality Management System
PED 2014/68/EU (Pressure Equipment Directive with CE Marking)
AD 2000-Merkblatt (German Pressure Vessel Code)
NACE MR0175 / ISO 15156 (Sulfide Stress Corrosion Cracking Resistance)
Approved by CNPC, Sinopec, CNOOC, Shell, ExxonMobil, BP, Total, Chevron, Woodside, etc.
Common Customer Questions (Q&A Format)
Q: What is a piping spool?
A: A piping spool is a pre-assembled pipe section with fittings and flanges welded in the shop, ready for field installation, improving efficiency and quality.
Q: What is the maximum size and weight of a spool?
A: Typically up to 24 meters in length and 30 tons in weight, subject to transport and lifting constraints.
Q: Do you support 3D model-driven fabrication?
A: Yes, we accept ISOGEN drawings or 3D models from PDMS, SP3D, AutoCAD for digital fabrication and dimensional accuracy.
Q: Are welding procedures qualified?
A: Yes, all WPS/PQRs are qualified per ASME IX or ISO 15614 and documented for review.
Q: Are NDT reports provided?
A: Yes, full RT or UT reports, plus MT/PT reports, are provided as per project specifications.
Q: How is dimensional accuracy ensured?
A: Using laser measurement and 3D CMM systems, with critical interface tolerances within ±2mm.
Q: Do you offer special surface treatments?
A: Yes, including sandblasting (Sa2.5), epoxy coating, polyurea, 3PE, and electropolishing (EP) for stainless steel.
Q: What is the lead time?
A: Standard projects: 30–60 days; large/complex modules: 60–120 days, depending on design and material availability.
Q: Is material traceability provided?
A: Yes, full mill traceability with MTC 3.1/3.2 for every pipe and fitting, from heat number to final product.
Q: Can branch connections (e.g., Weldolet) be added to spools?
A: Yes, we can fabricate branch connections per ASME B31.3 or customer drawings, including opening, welding, and RT inspection.
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