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Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Pipe Spools
Keywords: Piping Spool, Steel Pipe Spool, Fabricated Pipe Spool, Carbon Steel Pipe Spool, Stainless Steel Pipe Spool, Pre-fabricated Pipe Spool
Standard Spool Length: 12 m
Minimum Spool Length: 70 mm – 100 mm (as per requirement)
Maximum Spool Dimension: 2.5 m x 2.5 m x 12 m
Base Pipe Size: 1/2" – 48" (DN15 – DN1200), up to 60" custom
Wall Thickness: Sch 5S – XXS
Fabrication Standard: ASME B31.1 / B31.3
Flange Standards: ASME B16.5 / B16.47, DIN, JIS, EN

 

As a core component of our Pre-fabricated Piping Systems, our Pipe Spools are precision-welded pipe sections manufactured in a controlled factory environment. By pre-fabricating pipes, flanges, elbows, and tees into ready-to-install modules, we help EPC contractors and plant owners significantly reduce on-site labor costs, minimize safety risks, and accelerate project schedules. We fabricate custom pipe spools directly from your Isometric drawings (Isos) and P&IDs, fully compliant with ASME B31.1 (Power Piping) and ASME B31.3 (Process Piping) standards.


What We Fabricate

We handle a wide range of materials and configurations to meet your exact system requirements:

Flanged Spools: Pipes with welded flanges (ASME B16.5 / B16.47, DIN, JIS) for bolted connections.

Bent Spools: Pipes with customized bends and elbows to navigate around site obstructions.

Manifold & Header Spools: Complex spools with multiple branches, tees, and reducers.

Jacketed Spools: For high-viscosity fluids requiring steam or thermal fluid tracing.

Materials: Carbon Steel, Stainless Steel (304/316L), Duplex, and Alloy Steel (Cr-Mo).

Key Design Parameters

Parameter

Standard Range

Custom Capabilities

Base Pipe Size

1/2" – 48" (DN15 – DN1200)

Up to 60"

Wall Thickness

Sch 5S – XXS

Customized per pressure

Fabrication Standard

ASME B31.1 / B31.3

EN 13480

Flange Standards

ASME B16.5 / B16.47

DIN, JIS, EN

Spool Length/Weight

Customized to fit container limits

Optimized for FCL shipping


Fabrication Processes
We offer two primary fabrication methods based on your project requirements and site conditions:

Method 1: Roll Welding / Roll Fitting and Welding — Ideal for larger spools where the pipe is rotated during welding to ensure uniform weld beads and optimal penetration (typically used with SAW).

Method 2: Position Welding / Permanent Position Fitting and Welding — Used for complex geometries or large spools that cannot be rotated, ensuring precise alignment and weld integrity in a fixed position.


Manufacturing & Quality Assurance
Prefabricated spools require strict dimensional control to ensure they fit perfectly at the job site. Our process includes 3D modeling and layout, CNC precision cutting and beveling, and welding procedures qualified per ASME Section IX (WPS/PQR). All critical welds undergo Non-Destructive Testing (NDT), including Radiographic Testing (RT) and Ultrasonic Testing (UT). We also provide Post-Weld Heat Treatment (PWHT) for alloy steel spools and perform pre-assembly checks to ensure flange face parallelism and bolt hole alignment.


Applications

Our custom-fabricated pipe spools are engineered for high-pressure, high-temperature, and corrosive piping systems where on-site welding is impractical. Key applications include:

Oil & Gas: Wellhead manifolds, gathering lines, and transmission pipelines. Built for high pressure and corrosive media (H2S/CO2).

Petrochemical & Refining: Process piping, hydrocrackers, and chemical plants. Available in heavy-wall carbon steel and Cr-Mo alloy steel.

Power Generation: High-pressure steam lines and boiler feedwater systems. Compliant with ASME B31.1.

Water & Sewage: Large-diameter water mains and chemical dosing lines. Available with epoxy/rubber lining or in stainless steel.

Natural Gas: Metering stations and pressure regulating skids. Precision fit-up ensures zero leakage.


Specification of Pipe Spools

Pipe spool size

Production method

Material

Size range & pipe spool dimensions

Schedule / Wall Thickness

Minimum thickness (mm)
Schedule 10S

Maximum thickness (mm)
Schedule XXS

Seamless Fabricated

Carbon steel

0.5 – 30 Inch

3 mm

85 mm

Seamless Fabricated

Alloy steel

0.5 – 30 Inch

3 mm

85 mm

Seamless Fabricated

Stainless steel

0.5 – 24 Inch

3 mm

70 mm

Welded Fabricated

Carbon steel

0.5 – 96 Inch

8 mm

85 mm

Welded Fabricated

Alloy steel

0.5 – 48 Inch

8 mm

85 mm

Welded Fabricated

Stainless steel

0.5 – 74 Inch

6 mm

70 mm

Specification of pipe spool

Pipe spool dimensions

Flanged pipe spool standard

Certification

· 6 meter – ½” (DN15) – 6”NB (DN150)

· 3 meter – 8” (DN200) – 14”NB (DN350)

· ASME B16.5 (Class 150-2500#)

· DIN/ ANSI/ JIS/ AWWA/ API / PN standard

· EN 10204 3.1

· MTC 3.2 EN 10204

Common welding methods followed by pipe spool manufacturers

Welding standard

Welder test

· Manual

· Semi-automatic

· Robotic (FCAW, MIG/ MAG, GTAW, GMAW, SAW, SMAW, 1G TIG, 1G MIG)

· Welders as per API1104 (Uphill/Downhill)

· ASME Section IX

· AWS ATF

· ISO 17025

Hardness

Spool fabrication services

Pipe spool identification

· NACE

· API standards

· Pickling and passivation

· Grit blasting (manual and semiautomatic)

· High Speed Auto Cutting

· Painting (manual and semiautomatic)

· Surface treatment

· Auto Beveling

· Auto Welding with up to Pipe Size of 60”

Contact above listed pipe spool manufacturers for your specific requirements

· Labeled

· Pan marking

· dye stamping,

· Tagging–pipe heat numbers (before cutting pipe, labeled to the cut pieces)

· Rejected Spools – can be identified with yellow and black color tags (sent for repair job, and to pass NDT test)

Pipe spool hs code

Documentation

Testing

· 73269099

· QC/ QA Documentation as-built drawings

· Bolting Inspection according to RCSC

· MTC

· Raw Material Tests

· NDT/ non-destructive tests

· Chemical analysis

· Hardness

· Impact test

· Hydro test

· Visual control

· Radiographic

· Ultrasonic

· Mgnetic particle

· Dye penetrant examinations

· X-ray dimensional control

Code & standard

End-Prep

Marking Details

· ASME B31.1

· ASME B31.3

· ASME B 31.4

· ASME B 31.8

· PED 97/23/EC

· End preparation (beveling) for successful weld

· 37.5 degrees Beveled angle for welding

· Roll

· Cut-groove

· Pipeline No.

· Component Heat No.

· Joint No.

· Fit-up inspection signature

· Welder No.

· Visual inspection signature

· Welding date with metal paint marker ( marked near the joint)

· Spool Number on the pipe

· Aluminum tag is tied to the spool

Material wise cutting and marking process

· Carbon steel pipe spool – Using gas cutting & grinding

· Alloy steel pipe spool – Using flammable cutting or grinding

· Stainless steel pipe spool – Using plasma cutting or grinding

Heat-treatments

Storage & Packaging Protection tips

Industries

· Preheating

· PWHT

· Completed pipe spools with raised faces flange are fitted with plywood blinds

· Spool ends shall be kept with plastic caps

· Oil & Gas

· Chemical industry

· Power Generation

· Aviation Refueling

· Pipeline

· Wastewater/ Water Treatment

Pipe spool length

Minimum pipe spool length

70mm -100mm as per requirement

Maximum pipe spool length

2.5m x 2.5m x 12m

Standard pipe spool length

12m


Standard of Pipe Spools

Primary Piping Codes for Pipe Spool Fabrication

Code / Standard

Full Title

Applicability

ASME B31.3

Process Piping

Most common code for chemical, petrochemical, refinery, and pharmaceutical piping

ASME B31.1

Power Piping

For power generation plants, boiler external piping, and district heating

ASME B31.8

Gas Transmission and Distribution Piping

For natural gas pipelines and related facilities

ASME B31.9

Building Services Piping

For HVAC, plumbing, and building mechanical systems

ASME B31.12

Hydrogen Piping and Pipelines

For hydrogen service applications

API 5L

Line Pipe

For oil and gas transmission pipeline spools

EN 13480

Metallic Industrial Piping

European standard equivalent to ASME B31.3

EN 13445

Unfired Pressure Vessels (for skid piping)

European pressure equipment directive (PED)

ISO 15607

Specification and qualification of welding procedures

International welding standard

Material & Component Standards for Pipe Spools

Component

Standard

Key Requirements

Seamless Carbon Steel Pipe

ASTM A106 Gr.B / API 5L Gr.B

High-temperature service

Welded Carbon Steel Pipe

ASTM A53 Gr.B / API 5L Gr.B

General service

Alloy Steel Pipe

ASTM A335 P11, P22, P91

High-temperature chrome-moly

Stainless Steel Pipe

ASTM A312 TP304/304L, TP316/316L

Corrosion-resistant

Low-Temp Carbon Steel Pipe

ASTM A333 Gr.6

Service down to -46°C

Butt-Weld Fittings

ASME B16.9

Elbows, tees, reducers, caps

Forged Fittings (Socket-Weld/Threaded)

ASME B16.11

Small diameters (≤4″)

Pipe Flanges

ASME B16.5 (≤24″); ASME B16.47 (≥26″)

Classes 150 to 2500

Gaskets

ASME B16.20 / B16.21

Spiral wound, ring joint, non-metallic

Stud Bolts & Nuts

ASTM A193 / A194

B7/2H for carbon steel; B8M/8M for stainless

Material & Component Compatibility

Compatible pipe fittings and flanges for pipe spool fabrication

Material

Pipe

Compatible pipe fittings

Compatible flanges

Carbon steel pipe spool

ASTM A106 Grade B

ASTM A333 Grade 6

ASTM A53 Grade B

ASTM A234 WPB

ASTM A420 WPL6

ASTM A105

ASTM A350 LF2

Stainless steel pipe spool

A312 TP304/ 304L/ 316/ 316L

ASTM A403 WP304/ 304L/ 316/ 316L

ASTM A182 F304/ 304L/ 316/ 316L

Titanium pipe spool

ASTM B861

ASTM B363

ASTM B381

Nickel pipe spool

Hastelloy pipe spool

Inconel pipe spool

Monel pipe spool

Alloy 20 pipe spool

ASTM B775

ASTM B622

ASTM B444/ B705

ASTM B165

ASTM B729

ASTM B366

ASTM B564

Duplex / Super duplex/ SMO 254 pipe spool

ASTM A789

ASTM A815

ASTM A182

Copper nickel/ Cupro Nickel pipe spool

ASTM B467

ASTM B171

ASTM B151

Pipe spool fabrication process

Method 1

Roll welding/ Roll fitting and welding

Method 2

Position welding/ Permanent position fitting and welding


Fabrication Process of Pipe Spool

To ensure seamless on-site assembly, we follow a rigorous 6-step workflow:

1. Engineering & Isometric Drawing Review
Every project starts with a meticulous review of your isometric drawings and P&IDs. Our engineering team verifies all dimensional data, material specifications, and pressure ratings before any cutting begins. Catching errors at this digital stage takes minutes, saving you days of costly rework on the construction site.

2. Material Matching & Traceability
We source and match the exact base pipes, compatible fittings, and flanges for your project (e.g., pairing ASTM A106 pipe with A234 WPB fittings and A105 flanges). All Mill Test Reports (MTRs) are strictly verified and archived, ensuring 100% material traceability for your compliance and QA/QC documentation.

3. Precision Fabrication & Fit-up
Our workshop handles a vast range of sizes—from 70 mm micro-spools to 12 m standard assemblies. Each piece is precision cut, beveled, and fitted to account for cumulative tolerances across the entire system. This guarantees that when your spools arrive on-site, flanges and bolt holes align perfectly without forcing or shimming.

4. Advanced Welding & Inspection
We select the optimal welding process based on your material and wall thickness: TIG (GTAW) for precise stainless steel roots, MIG (GMAW) for efficient carbon steel, and SAW for heavy-wall, large-diameter pipes. We utilize both Roll Welding for straight spools and Position Welding for complex geometries. Every weld undergoes strict inspection (Visual, RT, UT, or Hydrostatic) per ASME codes.

5. Surface Treatment & Smart Marking
After fabrication, spools are cleaned, primed, or coated to your specifications. Crucially, every spool is assigned a unique identifier that directly matches your isometric drawing. On-site installation becomes a simple "match-the-numbers" process, eliminating the need for field re-measuring.

6. Protective Packaging & Sequenced Logistics
Finished spools are wrapped in waterproof paper, securely bundled with steel strips, and tagged (two tags per bundle) for easy identification. We offer sequenced delivery, meaning spools arrive in the exact order they will be installed. This minimizes your on-site storage footprint and keeps your construction schedule moving smoothly.


1. How do you ensure the spools will fit perfectly on-site?
We fabricate directly from your isometric drawings and strictly control cumulative tolerances. During the final inspection, we check flange face parallelism and bolt hole alignment. Each spool is marked with a unique ID matching your drawing, making on-site installation a simple "match-the-numbers" process without on-site re-measuring or shimming.


2. What is the difference between Roll Welding and Position Welding?

Roll Welding: The pipe is rotated during the welding process. This is ideal for straight spools, ensuring uniform weld beads and deep penetration (often used with SAW).

Position Welding: The pipe remains stationary. This is used for complex geometries or large, heavy spools that cannot be rotated, ensuring precise weld integrity in a fixed position.


3. Can you fabricate micro-spools or very large assemblies?
Yes. Our fabrication capabilities range from 70 mm micro-spools to 12 m standard lengths, with a maximum dimension of 2.5 m x 2.5 m x 12 m. For oversized spools, we can optimize the "spool breaks" to fit into standard 40-foot containers, saving you freight costs.


4. How do you guarantee material compatibility and traceability?
We strictly match the base pipe with compatible fittings and flanges (e.g., pairing ASTM A106 pipe with A234 WPB fittings and A105 flanges). All Mill Test Reports (MTRs) are verified and filed. We also offer PMI (Positive Material Identification) testing to guarantee 100% material traceability.


5. What materials and standards do you work with?
We fabricate spools in Carbon Steel, Stainless Steel (304/316L), Duplex, and specialty alloys (Titanium, Nickel, Hastelloy). Our fabrication complies with ASME B31.1 (Power Piping) and ASME B31.3 (Process Piping), with welding qualified under ASME Section IX.


6. What are your packing and delivery terms?

Packing: Wrapped in waterproof paper, bundled securely with steel strips, and tagged (two tags per bundle). End caps are used to protect flange faces.

Delivery: We offer sequenced delivery—spools arrive in the exact order they are to be installed, minimizing on-site storage space.

Lead Time: Typically 30–45 days after drawing approval.

Payment Terms: T/T, L/C, O/A, D/P.


Related Products

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Keywords: Carbon steel storage tank, Carbon steel oil tank, Carbon steel water tank, API 650 storage tank, Industrial storage tank, Capacity (Volume): 1 m³ – 5,000 m³ Up to 20,000 m³ Diameter: 1 m – 30 m Custom per design Design Pressure :Atmospheric to 10 MPa Depends on ASME code Design Temperature: -20°C to 400°C Customized per media Tank Orientation: Vertical / Horizontal — Roof Type: Open top / Conical / Dome Floating roof (API 650) Material Grade : ASTM A36, A516 Gr.70, Q235B, Q345R Customized alloy/carbon steel
Keywords: Carbon Steel Flange, Alloy Steel Flange, Stainless Steel Flange Size Range: 1/2" – 48" Standard: ANSI/ASME B16.5, B16.47 (Series A & B), B16.48 (Line Blanks), BS4504, BS 10, EN-1092, DIN Grade:Carbon Steel: A105, A350 LF2/LF3 Alloy Steel: A182 F1, F5, F9, F11, F22, F91 Stainless Steel: A182 F304, F316, F321, F347 Class / Pressure: 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 Packing: Standard export package (wooden cases/pallets) or in bulk.

Contact Us

Telephone:
+86-0731-8867-8530
E-mail:
Address:
Hunan Steel Industrial Zone,No.9 Xiangfu Road, Yuhua District,Changsha,Hunan,China.
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