PIPING COMPONENTS
GC2-certified pressure piping elements and shop-fabricated pipe spools -- from a manufacturer that also holds the pressure vessel license. One supplier, no interface risk.
Why Piping Components Matter -- and Why Source Matters
Pressure piping components are not bulk commodity items when they carry hydrocarbons at elevated pressure and temperature. A flange that leaks, a fitting with insufficient wall thickness, or a pipe spool with an undetected weld defect is a safety incident. GC2 certification -- China's licensed category for pressure piping component fabrication -- exists because these components warrant the same manufacturing quality oversight as pressure vessels.
Skid-Integrated Pipe Spools for Process Equipment
Every process skid that LINSON OIL fabricates -- separators, heater packages, molecular sieve dryers, chemical injection skids -- requires a network of interconnecting pipe spools. Fabricating these spools in-house, under the same GC2 license and quality system as the pressure vessels themselves, eliminates the quality and dimensional interface that arises when spools are sourced from a separate piping fabricator. Our integrated supply means the spool fits because it was designed and fabricated with the vessel, not adapted to it after the fact.
Piping Manifolds for Gathering and Wellhead Systems
Gas and liquid gathering manifolds -- where multiple well inlet lines connect to a common header -- are piping assemblies that fall under the pressure piping component category rather than the pressure vessel category when the header is a pipe rather than a vessel shell. LINSON OIL fabricates these piping-type manifolds under its GC2 piping license, with the same weld quality and NDT requirements as its vessel-type manifolds.
High-Pressure Fittings for Wellhead and Downhole Service
Wellhead and high-pressure injection system piping requires fittings rated for design pressures up to 70 MPa or above. Standard commodity fittings sourced without traceability are not appropriate. LINSON OIL supplies high-pressure fittings -- elbows, tees, reducers, and end caps -- with full material traceability, dimensional inspection per ASME B16.9 / B16.11 or GB/T equivalent, and hydrostatic test certification where required.
Flanges and Specialty Fittings for Process System Completions
EPC contractors and plant operators frequently need to source flanges and specialty fittings as part of project completion or plant maintenance. LINSON OIL supplies flanges per ANSI/ASME B16.5 (in pressure classes 150# through 2500#), GB/T 9119, and DIN standards, in carbon steel, alloy steel, and stainless steel grades, with material traceability and dimensional inspection certificates.
Integration Reference:
All LINSON OIL skid packages -- separation skids, heating skids, molecular sieve dryers, chemical injection skids -- incorporate GC2-licensed pipe spools fabricated in-house. The piping is designed, fabricated, and NDT-tested as part of the skid quality system, not sourced separately.
View Skid-Mounted & Modular Solutions
GC2 Licensing -- What It Covers and Why It Matters
What GC2 Certification Means
In China's special equipment regulatory framework, pressure piping is classified by service and pressure into categories GC1, GC2, and GC3. GC2 covers industrial pipelines in oil, gas, chemical, and power applications -- the service category that encompasses process piping in upstream and midstream oil and gas facilities. GC2 certification for piping component fabrication requires:
- A licensed quality management system specifically for pressure piping fabrication
- Qualified welders per piping weld procedure specifications (WPS/PQR)
- In-house or accredited NDT capability covering piping welds
- Design capability to the applicable piping code (GB/T 20801 or ASME B31.3)
- Mandatory quality records for all pressure piping fabricated under the license
This certification is not the same as a general welding or metalwork capability. LINSON OIL holds both the pressure vessel manufacturing license (A2 + high-pressure) and the GC2 piping component license -- making it one of a limited number of manufacturers qualified to supply complete vessel-plus-piping assemblies from a single certified quality system.
Pipe Spool Fabrication -- Quality Benefits vs. Field Welding
Pipe spools are pre-fabricated piping sections -- pipe plus fittings plus flanges, assembled and welded in the workshop -- that are delivered to site ready for bolted connection. The quality advantages of shop fabrication over field welding are significant:
- › Controlled environment: no wind, rain, or temperature extremes affecting weld quality or NDT reliability.
- › Weld position: spools can be rotated to present welds in the most favourable position (flat or horizontal-rolled).
- › NDT accessibility: all welds accessible in the shop for full inspection.
- › Dimensional accuracy: spool end-to-end dimensions and flange orientations fabricated to tight tolerances.
- › Documentation: each spool weld traceable to welder, WPS, NDT record, and material heat.
Piping Design Code -- ASME B31.3 vs. GB/T 20801
ASME B31.3
The most widely recognized international piping design code for process service; required by most international oil company and EPC contractor specifications. Used for international and export projects.
GB/T 20801
The Chinese national standard for pressure piping design; equivalent in rigor to ASME B31.3 and required for China domestic projects. Dual compliance available.
Supply Range -- Pipe Spools, Fittings, and Flanges
Comprehensive manufacturing capabilities for pressure piping components across standard and high-pressure applications.
Pipe Spool Specification
| Parameter | Standard Range | Notes |
|---|---|---|
| Pipe Size | DN15 (½") - DN600 (24") | Larger sizes on request |
| Design Pressure | Vacuum - 42 MPa (ANSI 2500#) | Per piping class |
| Design Temperature | -196°C to +550°C | Material-dependent |
| Pipe Material | A106 Gr.B / A333 Gr.6 / A312 TP316L / A335 P11/P22 / Duplex / Hastelloy | Per fluid and temperature |
| Fitting Standard | ASME B16.9 (butt weld) / B16.11 (socket weld/threaded) | GB/T equivalents available |
| Flange Standard | ASME B16.5 (150# - 2500#) / B16.47 (large diameter) | GB/T 9119 for domestic |
| Flange Face | RF (raised face) / FF (flat face) / RTJ (ring-type joint) | Per pressure class and service |
| End Preparation | BW (butt weld) / SW (socket weld) / FNPT / Flanged | Per piping class |
| Weld Procedure | Per ASME B31.3 / GB/T 20801 WPS | All positions; all material grades |
| NDT -- Butt Welds | RT (100% or spot per piping class) / UT / MT / PT | Per design code requirement |
| Pressure Test | Hydrostatic at 1.5× design pressure (ASME B31.3) | Pneumatic available |
| Design Code | ASME B31.3 / GB/T 20801 | Dual compliance available |
| Dimensional Standard | ASME B36.10M / B36.19M | Schedule 40 through XXS and special wall |
| Documentation | Spool isometric drawing, weld map, MTRs, NDT reports, pressure test record | 3.1 certs available |
Flanges and Fittings Supply Range
| Item | Standards | Pressure Classes / Sizes |
|---|---|---|
| Weld neck flanges | ASME B16.5 / GB/T 9119 | 150# - 2500# / DN15 - DN600 |
| Slip-on flanges | ASME B16.5 / GB/T 9119 | 150# - 600# / DN15 - DN600 |
| Blind flanges | ASME B16.5 / GB/T 9119 | 150# - 2500# / DN15 - DN600 |
| RTJ flanges | ASME B16.5 | 300# - 2500# (high-pressure service) |
| Orifice flanges | ASME B16.36 | 300# - 2500# |
| Butt-weld elbows (45° / 90° / 180°) | ASME B16.9 | All schedules / DN15 - DN600 |
| Butt-weld tees (equal / reducing) | ASME B16.9 | All schedules / DN15 - DN600 |
| Butt-weld reducers (concentric / eccentric) | ASME B16.9 | All schedules / DN15 - DN600 |
| Socket weld fittings | ASME B16.11 | 3000# - 9000# / DN8 - DN50 |
| Threaded fittings | ASME B16.11 | 3000# - 6000# / DN8 - DN50 |
| Pipe nipples and couplings | ASME B16.11 / B1.20.1 | Various |
Standard Supply & Customization Scope
Standard Supply -- Pipe Spools
- Piping designed per applicable code (ASME B31.3 or GB/T 20801) to client's piping class specification
- Pipe, fittings, and flanges sourced with mill certificates (or 3.1 certs on request)
- Spool isometric drawing issued before fabrication begins; client approval available
- Welding per qualified WPS; all welders qualified per ASME IX or GB/T 19869
- NDT per piping class: RT on butt welds (100% for Class 1; spot for Class 2; visual-only for Class 3), MT/PT on branch welds and socket welds
- Hydrostatic pressure test at 1.5× design pressure per ASME B31.3
- Spool identification: unique spool number per isometric, marked on spool
- Quality dossier: weld map, MTRs, NDT reports, pressure test record, as-built isometric
Standard Supply -- Flanges and Fittings
- Material: carbon steel (A105 / ASTM A234 WPB), chrome-moly, stainless steel, per order
- Mill certificates on all items as standard
- Dimensional inspection per applicable ASME / GB standard
- Visual and PMI verification on alloy items
OEM / ODM Customization Options
| Option | Application |
|---|---|
| 3.1 material certificates (EN 10204) | Export and international procurement requirements |
| 100% RT on all piping welds | High-criticality service; client quality specification |
| Positive material identification (PMI) on all items | Alloy verification; international quality specifications |
| Exotic material spools (Duplex, Super Duplex, Hastelloy, Titanium) | Aggressive corrosion service; offshore produced water; chemical injection |
| Low-temperature material (A333 Gr.6 / 304L / 316L) | Cryogenic adjacent; cold climate; LNG-adjacent service |
| Insulated spool fabrication | Factory-applied insulation and cladding; reduces field insulation scope |
| Heat-traced spool (electric trace cable integrated) | Anti-freeze or anti-wax tracing incorporated at spool fabrication stage |
| ASME B31.3 Category M (highly hazardous) | More stringent examination; required for toxic service piping |
| Large-bore spools (> DN600) | Custom design and fabrication for non-standard pipe sizes |
| Full piping isometric drawing package | LINSON OIL prepares piping isometrics from P&ID and general arrangement |
| Third-party inspection (SGS / BV / DNV) | International project procurement |
| ASME B31.3 compliance certification letter | Required by some international EPC project specifications |
GC2 Licensed. CNAS Tested. ASME B31.3 Compliant. Traceable to Every Heat.
Rigorous quality control systems integrating pressure vessel and piping fabrication under one roof.
The Single-Source Advantage
When pressure vessels and their interconnecting piping are sourced from different manufacturers, the interface between them is a quality risk zone. LINSON OIL's GC2 piping license means that for all skid-integrated packages, the pipe spools connecting vessels, heat exchangers, and instruments are fabricated under the same quality system, by the same welding team, using the same WPS records, inspected by the same CNAS-accredited NDT team, and documented in the same quality dossier as the pressure vessels themselves. The interface risk is eliminated.
Core Certifications
- Special Equipment Manufacturing License -- Pressure Piping Components (GC2)
- Industrial Pipeline Installation License (GC2)
- ASME B31.3 compliance for international projects
- ISO 9001:2015 Quality Management System
- ISO 3834-2 Welding Quality Management (Comprehensive)
- CNAS Accredited Laboratory for NDT and hydrostatic testing
- Sinopec & CNPC HSE Certified Supplier
In-House QA Process
GC2 Piping -- Integrated Into Every Skid Package We Build.
All LINSON OIL Skid-Mounted Packages
Every skid-mounted package that LINSON OIL fabricates contains GC2-licensed pipe spools fabricated in-house. The piping is an integral part of the skid quality system: designed, fabricated, NDT-tested, and documented as part of the same project quality dossier as the pressure vessels.
Sinopec Northwest Bureau -- Shunbei No. 5 Molecular Sieve Dehydration Skid
The dehydration skid required GC2-licensed piping fabrication for high-pressure gas service conditions. In-house pipe spool fabrication under the same quality system as the adsorber vessels provided seamless documentation and a single quality dossier.
Congo (Brazzaville) -- Jiarou Oilfield, Phase I / II / III
The multi-phase associated gas and LNG processing system included significant volumes of process piping within skid packages and as interconnecting piping between skid modules. All pressure piping fabricated under GC2 license with full material traceability.
Warranty Terms
Standard: 2 years from commissioning or 26 months from delivery -- covering fabrication defects in pipe spool welds, dimensional conformance, and flange and fitting material quality. Industry benchmark: 1 year.
Long-term partners: up to 2.5 years, with engineering support for piping system modifications, additional spool fabrication for capacity expansions, and replacement spool supply using as-built records.
After-Sales Support
- Replacement spool fabrication: using as-built isometrics and material specifications from the original quality dossier.
- Piping system modification engineering: redesign and fabricate replacement spools to updated requirements.
- In-service inspection guidance: recommendations based on fluid corrosivity and operating conditions.
Pipe Spools, Flanges, or a Complete Piping Package. Send Us the Piping Class.
Pipe spool procurement starts with the piping class specification: design pressure, design temperature, material grade, and NDT level. For complete spool packages -- where LINSON OIL prepares the isometrics from your P&ID -- we need the P&ID, general arrangement, and nozzle schedule. Send us what you have and our piping engineers will confirm the scope and respond typically within 1-2 business days.
LINSON OIL -- GC2 Pressure Piping License | ASME B31.3 | ISO 3834-2 Welding Quality | CNAS Accredited NDT | Single Source for Vessels + Piping