Prefabricated Pipe Spools Pre-Fabrication of Piping spools Piping,Welding,Fabrication
What is a pipe spool?
A pipe spool is an assimilation of piping components, which is prefabricated in a piping shop for installation in the field. They are often flanged to facilitate the connection to other spools.
Pipe spools are the pre-build parts of a piping system. Pipes, Flanges, and Fittings are called pipe spools and they are produced before they are used in the piping system.
Components of Piping System:
Pipes, Flanges, Elbows, Tees, Reducers, Valves etc.
Pre-Fabricatation of Pipe Spools
Prefabricated Piping Spools, Jacketed Piping, Piping primary and secondary Supports in accordance to ANSI B 31.3, ANSI B 31.8 for various Piping Material Specifications as specified by Customer for Carbon Steel, Alloy Steel ( P11, P2, P91), Stainless steel, Duplex Steel Materials.
A pipe spool is a pre-assembled section of a piping system that includes pipes, fittings, flanges, elbows, tees, and supports, all fabricated in a controlled environment before being transported to the site for installation. Pre-fabrication significantly improves efficiency, accuracy, and installation speed compared to on-site fabrication.
Materials Used in Pre-Fabricated Pipe Spools
Pipes:
🔹 Carbon Steel – ASTM A333 grade 6,ASTM A106, ASTM A53 grade B , API 5L Grade B X42/65/70 (for general and high-pressure applications)
🔹 Stainless Steel – ASTM A312 TP304/L, TP316/L, TP321, Duplex S31803. Duper Duplex S32750/S32760
🔹 Alloy Steel –ASTM A335 P11, P22, P91,P92 (for high-temperature & pressure applications)
Fittings:Elbow,Tee,reducer.Caps.
🔹 Carbon Steel – ASTM A234 WPB, A420 WPL6
🔹 Stainless Steel – A403 WP304/L, WP316/L, WP321,,S31803. Duper Duplex S32750/S32760
🔹 Alloy Steel –ASTM A234 W P11, WP22, WP91,WP92 (for high-temperature & pressure applications)
Flanges
🔹 Carbon Steel – ASTM A105, ASTM A350 LF2
🔹 Stainless Steel – A182 F304/L, F316/L, F321, F51/F53/F55,S31803. Duper Duplex S32750/S32760
🔹 Alloy Steel ,A182 F11,F12,F5,F91,92
Why pipe spools are pre-fabricated..
Shop Pre-Fabrication of pipe spools is a proven means for reducing field installation costs while providing the highest of quality in the products fabricated.
Pipe spools are often flanged to facilitate the connection to other spools. The fabrication of these spools is normally performed by specialist fabrication companies which are equipped with the required infrastructure.
The specialist fabricators work under defined set of quality management criteria to ensure the accuracy of fabrication in order to achieve the proper fit at site and to maintain the required technical parameters defined by the client.
Pre-Fabrication Process
1. Engineering & Design
Detailed isometric drawings, P&ID, and 3D models are created
Selection of materials, pipe sizes, and fittings
Weld mapping and non-destructive testing (NDT) planning
2. Material Procurement & Cutting
Pipes and fittings ,flanges are made according to project specifications
Precision cutting using CNC machines, saws, and plasma cutting
3. Welding & Assembly
Butt welding, socket welding, and TIG/MIG welding for strong joints
Flanges, elbows, tees, and valves are fitted as per design
Welding inspected using X-ray, ultrasonic, or dye penetration testing
4. Surface Treatment & Coating
Galvanization, painting, or powder coating for corrosion resistance
Internal lining (FBE, epoxy, rubber, or FRP) based on application
5,Testing & Quality Control
Hydrostatic pressure testing ensures leak-proof operation
Dimensional and alignment checks for precision
NDT (Radiography, UT, MPI) to detect welding defects
6. Packaging & Transportation
Pipe spools are labeled, bundled, and shipped to the installation site
Modular skid units can be transported for quick assembly
Applications of Pre-Fabricated Pipe Spools
🔹 Oil & Gas Pipelines – Offshore and onshore pipeline systems
🔹 Power Plants – Steam, condensate, and cooling water systems
🔹 Chemical & Petrochemical Plants – Corrosion-resistant chemical transport
🔹 Water & Wastewater Treatment – Industrial and municipal pipelines
🔹 Refineries – Process piping for crude oil, gas, and chemicals
🔹 Shipbuilding & Marine – Seawater transport and ballast piping