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Pipe Spool

Keywords: Piping Spool, Steel Pipe Spool, Fabricated Pipe Spool, Carbon Steel Pipe Spool, Stainless Steel Pipe Spool

Fabrication process:Method 1: Roll welding/ Roll fitting and welding

Fabrication process:Method 2: Position welding/ Permanent position fitting and welding

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

Packing:Waterproof Paper wrapped, Steel Strips bundled, two tags on each bundle

Usage:Used for natural gas, petroleum, water & sewage, and pipe systems

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Specification
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Process
Packing
FAQ

A Pipe Spool is a prefabricated section of a piping system, consisting of a length of pipe combined with flanges, elbows, tees, and other fittings. It serves as a modular building block in industrial construction, designed to be manufactured in a controlled shop environment and then transported to the job site for final assembly. By shifting the fabrication work from the construction site to the factory, pipe spools significantly improve quality control, reduce labor costs, and accelerate project schedules.

Our pipe spools are engineered to handle the most demanding conditions, including high pressure, extreme temperatures, and corrosive media. We utilize advanced welding and inspection techniques to ensure that every spool meets the strict dimensional tolerances required for seamless field installation. The complexity of a spool can range from a simple "stick" of pipe with two flanges to intricate 3D assemblies with multiple branches and supports.

Pre-Fabrication of Pipe Spools

Roll correction and welding process are fitting of the main pipe by rolling machine and the welder does not need to change his situation, and also the position of fitting and welding occur when more than one branch of the long pipe overcome the clearance limit. To create a more efficient piping system and save time, pipe spool pre-fabrication is used. Because if the system did not produce preliminary, the welding of the system will take much more time and the welder has to move over the main pipe to accomplish fitting or welding.

Why Pipe Spools are Pre-fabricated?

Pipe spools are pre-fabricated to reduce field installation costs and provide higher quality in the products. They are generally flanged to obtain the connection to other spools. The spool fabrication is normally performed by special companies having the required infrastructure. These specialist fabricators produce the system under the specified set of quality and accuracy to obtain proper fit at the site and to maintain the necessary technical properties defined by the client.

Mainly used pipeline systems are generally:

Steel pipes

For the supply of water and flammable gases, steel pipes are the most useful pipes. They are used in many homes and businesses to transfer natural gas or propane fuel. They also used for fire sprinkler systems due to their high heat resistance. The durability of steel is one of the best advantages of the pipeline systems. It is strong and it can withstand the pressures, temperatures, heavy shocks, and vibrations. It also has unique flexibility which provides an easy extension.

Copper pipes

Copper pipes are mostly used for the transportation of hot and cold water. There are mainly two types of copper pipes, soft and rigid copper. Copper pipes joined using flare connection, compression connection, or solder. It is expensive but offers a high level of corrosion resistance.

Aluminum pipes

It is used due to its low cost, resistance to corrosion and its ductility. They are more desirable than steel for the conveyance of flammable solvents because of none spark formation. Aluminum pipes can be connected by the flare of compression fittings.

Glass pipes

Tempered glass pipes are used for specialized applications, such as corrosive liquids, medical or laboratory wastes, or pharmaceutical manufacturing. Connections are generally made using a specialized gasket or O-ring fittings.

Key Applications:

• Oil & Gas Refining: Critical for connecting distillation columns, reactors, and storage tanks in refineries.

• Petrochemical Plants: Used in ethylene and ammonia plants where leak-tight integrity is non-negotiable.

• Power Generation: Essential for steam lines, feedwater systems, and cooling water circuits in thermal and nuclear power plants.

• Shipbuilding: Compact pipe spools are vital for the complex engine rooms and piping networks of marine vessels.

• Water Treatment: Large-diameter spools are used for intake and discharge lines in municipal water infrastructure.

Pipe spool size

Production method	Material	Size range & pipe spool dimensions	Schedule / Wall Thickness
Production method	Material	Size range & pipe spool dimensions	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

The Pipe Spool is fabricated and tested in compliance with a comprehensive range of international piping codes and standards. The tables below summarize the key applicable standards.

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

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

Proper packing is essential to prevent damage to the pipe spool, especially to the machined flange faces and beveled ends, during long-distance transportation.

• Flange Protection: The most critical part of packing. We install heavy-duty plastic or wooden covers over the flange faces. For high-end projects, we use steel caps bolted directly to the flange to prevent any impact damage.

• End Protection: Beveled ends (if not flanged) are protected with plastic caps or wooden crates to maintain the welding bevel geometry.

• Bundling: Small diameter spools (NPS < 4") are bundled together using steel straps. Wooden dunnage is placed between layers to prevent scratching and to allow for forklift handling.

• Crating: Complex or delicate spools are placed in fumigated wooden crates or on heavy-duty wooden skids. They are secured with steel bolts or chains to prevent movement during transit.

• Marking: Each spool is clearly marked with a unique Tag Number (matching the ISO drawing), Heat Number, and Gross Weight. This ensures easy identification and sorting at the construction site.

Q1: What is the difference between a Pipe Spool and a Pipe Assembly?

A: While often used interchangeably, a Pipe Spool typically refers to a prefabricated section made in a factory (shop-fabricated) consisting of pipe and fittings. A Pipe Assembly is a broader term that can refer to the final installation of multiple spools connected on-site, or smaller, flexible hose assemblies.

Q2: Why should I use prefabricated pipe spools instead of stick-building on site?

A: Prefabrication offers three main advantages:

Quality: Shop conditions allow for better welding quality control and NDT than field conditions.

Speed: Fabrication can happen in parallel with civil construction, reducing the overall project schedule.

Safety: It reduces the amount of hot work (welding) and working at heights required at the job site.

Q3: How do you ensure the spool fits perfectly when installed on site?

A: We use high-precision laser scanning and 3D modeling software during the engineering phase. Additionally, we maintain strict fabrication tolerances (typically±1.5mm for length). For complex tie-in points, we can leave "field cut" lengths or use adjustable spools to accommodate minor site deviations.

Q4: Can you fabricate spools from exotic materials?

A: Yes. In addition to Carbon Steel, we have specialized workshops for Stainless Steel (304/316), Duplex/Super Duplex, and Nickel Alloys (Inconel, Monel). We ensure strict segregation of materials to prevent cross-contamination, especially for stainless steel.

Q5: How are pipe spools tested?

A: Each spool undergoes visual inspection (VT) of all welds, followed by NDE as required (RT, PT, MT, UT). Finally, a hydrostatic test is performed at 1.5×design pressure (or pneumatic test for gas service). Test certificates are provided.

Q6: Why choose prefabricated pipe spools over field fabrication?

A: Shop fabrication offers controlled environment (no weather delays), higher welding quality (qualified procedures, automated equipment), better dimensional accuracy (fixturing tables), faster construction (parallel activities), reduced on-site labor (lower cost, less congestion), and improved safety (less elevated work, fewer hot work permits). For large projects, spool prefabrication can reduce overall schedule by 20–40%.