A plant shutdown is a short window, and every pipe or flange that has to be cut, fitted and welded on site eats into it. New construction projects face the same problem when too much fabrication is left for the field. That's where prefabricated piping spools help. Pipes, fittings and flanges are cut, fitted and welded in the workshop according to approved isometric drawings, then inspected and tested as required before delivery for site installation.
ARK Stainless Inc. is a manufacturer, supplier and exporter of piping spools based in Mumbai, India. We offer custom pipe spool fabrication in SS 304, SS 304L, SS 316, SS 316L, SS 317L, SS 321, SS 347 and 904L, Carbon Steel ASTM A106 Gr. B, ASTM A53 and ASTM A234 WPB, Alloy Steel P5, P9, P11, P22 and P91, Duplex 2205, Super Duplex 2507, Titanium Grades 2 & 5, Copper Nickel 90/10 & 70/30, Inconel, Monel, Hastelloy, Incoloy, Nickel Alloy 200/201 and other project-specific materials for oil and gas, refineries, petrochemical plants, power generation, water treatment and industrial process piping.
From straight and flanged pipe spools to assemblies with elbows, tees, reducers and branch connections, we fabricate to your drawings. Send us your isometrics, material requirements and quantities, and we'll review them for quotation.
A piping spool is a prefabricated section of a piping system, built in a workshop from pipes, fittings and flanges according to an approved isometric drawing, then delivered to site to be bolted or welded into the line.
A typical spool combines pipes with elbows, tees, reducers, flanges and branch connections, and sometimes valves, supports, vents and drains. Flanged piping spools and welded piping spools are commonly used in industrial piping systems, depending on the connection requirements. Because much of the piping spool fabrication and inspection happens in the workshop, fewer joints need to be completed on site.
Each spool is built to the project specification: pipe size, wall thickness, design pressure and temperature, material grade, welding procedure and inspection requirements. Ends can be flanged, bevelled, threaded or grooved to suit the line. EPC contractors, fabricators and plant owners use prefabricated piping spools to reduce site welding and keep construction and shutdown schedules on track.
ARK Stainless Inc. manufactures prefabricated piping spools in different sizes, materials and configurations for industrial piping systems. Each spool is fabricated to approved isometric drawings and project specifications, whether it's for a new plant, an expansion project, shutdown maintenance or replacement of existing pipework.
Our range includes straight, flanged, welded, elbow, tee, reducer, valve and custom fabricated pipe spools. Depending on the drawing, an assembly may include pipe fittings, flanges, branch connections, valves, supports, vents and drains. The arrangement, material and end connections are determined by the piping layout and service requirements.
Straight pipe spools consist of a straight pipe section with flanged, welded, threaded or other specified end connections. They are commonly used to connect equipment, vessels and existing pipework in process plants, utility lines and water distribution systems. Each spool is fabricated to the required length, pipe size and material specification.
These spools are useful around pumps, valves, heat exchangers and other equipment that may need to be disconnected for maintenance. The flange standard, pressure class and facing must match the connecting pipework.
An elbow pipe spool combines straight pipe sections with one or more elbows where the piping needs to change direction. The angle, dimensions and end connections follow the approved isometric drawing.
These assemblies are used in process plants, refineries, power stations and other installations where pipe routing and fit-up dimensions matter.
Tee and branch pipe spools are used where a line splits into two or more connections, or where another pipe joins the main line. Depending on the layout, the assembly may include equal tees, reducing tees, fabricated branches or specified branch outlet fittings.
The branch size, location and orientation are taken from the drawing so the spool fits the piping arrangement at site.
Valve pipe spools incorporate valves and the required connecting pipework into a prefabricated assembly. Depending on the project, these may include gate valves, globe valves, ball valves, check valves, butterfly valves or control valves.
The valve type, end connections, orientation and access requirements need to be confirmed before fabrication, particularly where the assembly must fit into an existing line.
Reducer pipe spools connect sections of piping with different diameters. They may use concentric or eccentric reducers, depending on the pipe layout and process requirements.
These spools are commonly required around pump suction and discharge lines, equipment connections and process piping where pipe sizes change.
Instrument pipe spools have built-in connections for pressure gauges, temperature sensors, transmitters and other instruments. A spool might need a small-bore branch, a threaded outlet, a welded connection or an isolation valve, depending on what the instrument requires.
The position of each connection matters. An outlet facing the wrong way can make an instrument difficult to install or maintain. We fabricate these spools to approved drawings, with the branch size, location and orientation specified for the line.
Equipment connection spools join pumps, compressors, heat exchangers and pressure vessels to the surrounding pipework. The arrangement is rarely the same from one installation to another, so these spools are generally fabricated to the equipment layout and approved drawings.
A spool may need elbows, reducers or flanges to connect equipment nozzles to the existing line. The face-to-face dimensions and flange alignment matter here. A poorly fitted spool can put unwanted loads on equipment connections or create problems during installation.
Carbon steel piping spools are a common choice for steam, water, oil and gas, and general process lines. They're relatively economical, easy to fabricate and weld, but need suitable corrosion protection where the service conditions call for it. For low-temperature applications, grades such as ASTM A333 Grade 6 may be specified, depending on the required impact toughness.
Stainless steel piping spools are used where corrosion resistance matters, particularly in chemical processing, pharmaceutical plants, food processing and industrial utility systems. SS 304 and SS 316L are commonly specified, with 316L offering better resistance to pitting in many chloride-containing environments.
Welding can leave heat tint around the joints, so post-weld cleaning, pickling and passivation may be required. Some hygienic piping applications also call for controlled internal surface finishes or electropolishing.
Duplex stainless steel piping spools combine high strength with good resistance to chloride stress corrosion cracking. Grades such as Duplex 2205 offer roughly twice the yield strength of conventional SS 304 or SS 316, making them useful for offshore piping, desalination plants and chemical processing systems.
That extra strength can sometimes allow thinner pipe walls, depending on the piping design. Duplex welding needs controlled heat input and suitable procedures, while prolonged high-temperature service must be checked against the selected grade's limits.
Clad pipe spools use carbon steel as the base material, with a corrosion-resistant layer of stainless steel or nickel alloy bonded to the inside surface. This gives the piping system the strength of carbon steel and corrosion resistance where the process fluid contacts the pipe, often at a lower material cost than solid alloy construction.
Fabricating clad piping spools requires suitable welding procedures to maintain the corrosion-resistant layer across the joints. The cladding material, thickness and inspection requirements are specified in the project documents.
Not every piping spool follows a standard layout. Some need multiple bends, branch connections, different flange ratings or special dimensions to fit the equipment and pipework already on site. At ARK Stainless Inc., we fabricate custom piping spools to approved isometric drawings, piping classes and project specifications.
We supply prefabricated piping spools for process piping, utility lines, water treatment plants, equipment skids, chemical processing units and refineries. Your project drawings and specifications determine the material grade, pipe schedule, end connections, welding requirements and inspection scope.
For EPC contractors and plant owners, workshop fabrication means less welding, fewer adjustments and less work during site installation. Send us your isometric drawings, material specifications, quantities and any NDT or hydrotesting requirements. We'll check the details and prepare a quotation.
A piping spool goes from an approved isometric drawing to a finished, tagged and packed assembly through six main stages. For projects involving multiple spools, different materials and welding requirements, each stage helps keep fabrication, inspection and documentation in order.
ARK Stainless Inc. manufactures custom piping spools according to approved isometric drawings, fabrication drawings and client specifications. Send us the drawings, material requirements, pipe sizes and quantities, and we'll review the assembly for quotation.
Selecting the right material is one of the most important considerations when fabricating a piping spool. The operating pressure, temperature, process fluid and service environment all influence the material selection. At ARK Stainless Inc., we manufacture piping spools in a wide range of ferrous and non-ferrous materials to meet the requirements of refineries, petrochemical plants, power stations, offshore platforms, chemical processing facilities and other industrial piping projects.
| Material | Typical grades and standards | Applications |
|---|---|---|
| Carbon steel | ASTM A106 Gr B, A53, A333 Gr 6 (low temperature) | Steam, water, oil and gas, general process lines |
| Stainless steel | ASTM A312 TP304/304L, TP316/316L, TP321, TP347 | Chemicals, food, pharma, water treatment |
| Alloy steel | ASTM A335 P5, P9, P11, P22, P91 | High-temperature and power piping |
| Duplex | ASTM A790 UNS S31803 / S32205 | Chloride service, offshore, desalination |
| Super duplex | ASTM A790 UNS S32750 | Seawater and aggressive chloride service |
| Nickel alloys | Inconel 625, Incoloy 800, Monel 400, Hastelloy C-276 | Severe corrosion and high temperature |
| Titanium | ASTM B337 / B338 Gr 2 | Seawater, chemical and bleach service |
| Copper-nickel | ASTM B466 C70600 (90/10), C71500 (70/30) | Marine and seawater cooling |
Piping spool sizes and dimensions are determined by the approved isometric drawings and project specifications. A spool may be a short straight pipe with flanges at both ends or a larger fabricated assembly with elbows, reducers, branches and welded joints. The nominal pipe size, wall thickness, overall length and end connections must match the piping layout.
ARK Stainless Inc. undertakes custom pipe spool fabrication in different nominal pipe sizes (NPS/DN) and wall thickness schedules, including SCH 10, SCH 40, SCH 80 and other specified schedules, subject to material availability and fabrication requirements.
For flanged piping spools, the flange standard, pressure class, facing and orientation must match the connecting equipment or pipework. Welded pipe spools are fabricated with the specified end preparation, dimensions and welding requirements.
Our piping spool specifications are based on the customer's drawings, material requirements and applicable project standards.
| Parameter | Available Specifications |
|---|---|
| Product | Prefabricated Piping Spools, Custom Fabricated Pipe Spools |
| Pipe Size | Nominal Pipe Size (NPS) / DN as per project drawings |
| Pipe Schedule | SCH 10, SCH 40, SCH 80 and other specified wall thicknesses |
| Materials | Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex and specified special alloys |
| Spool Configuration | Straight, Flanged, Elbow, Tee, Reducer, Valve and Custom Assemblies |
| End Connections | Butt Weld, Flanged, Threaded and other specified end preparations |
| Flange Standards | ASME/ANSI, EN, DIN and other project-specified standards |
| Spool Dimensions | Overall Length, Face-to-Face Dimensions, Branch Orientation and Flange Alignment as per drawing |
| Welding Requirements | As per approved welding procedures and project specifications |
| Inspection & Testing | Dimensional Inspection, NDT, PMI and Pressure Testing as specified |
| Manufacturing Drawings | Approved Isometric Drawings, Fabrication Drawings and Client Specifications |
We fabricate stainless steel piping spools in ASTM A312, ASTM A358 and ASTM A778 pipe specifications using grades including SS 304, SS 304L, SS 316, SS 316L, SS 317L, SS 321, SS 347 and SS 904L. Stainless steel spools are widely used in chemical processing, pharmaceutical manufacturing, food processing, water treatment and general process piping where corrosion resistance and long service life are required.
Carbon steel piping spools are manufactured using ASTM A106 Grade B, ASTM A53, ASTM A234 WPB and ASTM A105 materials for utility piping, steam lines, fire protection systems, oil & gas projects and industrial process applications. Carbon steel remains one of the most widely used materials where strength, weldability and cost-effectiveness are important.
For elevated temperature and high-pressure service, we fabricate alloy steel piping spools in ASTM A335 P5, P9, P11, P22 and P91 grades. These materials are commonly specified for power plants, boilers, refineries, thermal processing units and steam distribution systems operating under demanding conditions.
We manufacture piping spools in Duplex 2205 (UNS S31803 / S32205) and Super Duplex 2507 (UNS S32750 / S32760) for applications involving seawater, chlorides and aggressive process fluids. These materials are widely used in offshore platforms, desalination plants, marine installations and chemical processing facilities where high strength and corrosion resistance are equally important.
For severe corrosion service, we fabricate piping spools in Nickel 200, Nickel 201, Inconel 600, Inconel 625, Inconel 800, Inconel 825, Monel 400, Monel K500, Hastelloy C22, Hastelloy C276, Alloy 20 and other high-performance nickel alloys. These materials are commonly selected for chemical processing plants, offshore facilities, fertiliser units and high-temperature process piping.
Titanium Grade 2, Titanium Grade 5, Copper Nickel 90/10 and Copper Nickel 70/30 piping spools are supplied for marine systems, desalination plants, seawater cooling circuits and offshore applications where long-term corrosion resistance is critical. These materials perform well in saltwater environments and are frequently specified for coastal and marine infrastructure projects.
| Material | Standard | Available Grades | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||
| Stainless Steel | ASTM A312 / A358 / A778 | 304 | 304L | 316 | 316L | 317L | 321 | 347 | 904L | ||
| ASTM A790 / A928 | Duplex 2205 | Super Duplex 2507 | |||||||||
| Alloy Steel | ASTM A335 | P1 | P5 | P9 | P11 | P22 | P91 | ||||
| ASTM A106 / A53 | Grade A | Grade B | Grade C | WPHY 42 | WPHY 46 | WPHY 52 | WPHY 60 | WPHY 65 | WPHY 70 | ||
| Nickel Alloy | ASTM B161 / B163 | Nickel 200 | Nickel 201 | Inconel 600 | Inconel 625 | Inconel 800 | Inconel 825 | Hastelloy C22 | Hastelloy C276 | Monel 400 | |
| ASTM B338 / B466 | Titanium Gr.2 | Titanium Gr.5 | Cu-Ni 70/30 | Cu-Ni 90/10 | |||||||
| High Nickel Alloys | ASTM B163 / B333 / B622 / B564 | Nickel 200 | Nickel 201 | Alloy 20 | Incoloy 800 | Incoloy 825 | Monel 400 | Monel K500 | Hastelloy C22 | Hastelloy C276 | |
| Inconel | ASTM B163 / B167 / B564 | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 | Inconel 800 | Inconel 825 | ||||
| Titanium | ASTM B348 / B381 / B861 | Grade 1 | Grade 2 | Grade 5 | Grade 7 | Grade 9 | Grade 12 | ||||
| Monel | ASTM B564 / B865 | Monel 400 | Monel K500 | ||||||||
| Hastelloy | ASTM B622 / B619 / B564 | Hastelloy C22 | Hastelloy C276 | Hastelloy B2 | Hastelloy X | ||||||
| Duplex & Super Duplex SS | ASTM A790 / A815 / A182 | Duplex 2205 | Duplex 2304 | Super Duplex 2507 | Super Duplex Zeron 100 | UNS S32750 | UNS S32760 | UNS S31803 | |||
| Spool No. | Material | Pipe Size (NPS) | Wall Thickness (mm) | Length (mm) | Weight (kg) | Joint Type | Weld Type | Chemical Composition (%) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | Cr | Ni | Other | ||||||||
| SP001 | Stainless Steel (304L) | 6” | 4.78 | 1500 | 45.6 | Butt Weld | GTAW | =0.03 | 2.00 | 18-20 | 8-10 | Si: 1.00 |
| SP002 | Carbon Steel (ASTM A106 Gr. B) | 8” | 6.35 | 2000 | 78.2 | Flanged | SMAW | =0.30 | 1.20 | - | - | Fe: Balance |
| SP003 | Duplex Steel (UNS S32205) | 10” | 9.27 | 2500 | 120.5 | Socket Weld | GTAW | =0.03 | 2.00 | 21-23 | 4.5-6.5 | Mo: 2.5-3.5 |
| SP004 | Super Duplex Steel (UNS S32750) | 12” | 10.31 | 3000 | 180.8 | Butt Weld | SMAW | =0.03 | 1.20 | 24-26 | 6-8 | Mo: 3-4.5 |
| SP005 | Nickel Alloy (Monel 400) | 6” | 7.11 | 1800 | 85.3 | Flanged | GTAW | =0.30 | 2.00 | - | Balance | Cu: 28-34 |
| Spool Number | Pipe Size (Inch) | Pipe Length (mm) | End Connection | Fitting Details | Weld Type | Material Specification | Weight (kg) | ||
|---|---|---|---|---|---|---|---|---|---|
| Elbow | Tee | Reducer | |||||||
| SP-001 | 6" | 1500 | Flanged | 2 x 90° (SCH 40) | - | - | Butt Weld | ASTM A106 Gr. B | 35 |
| SP-002 | 8" | 1800 | Butt Weld | 1 x 45° (SCH 80) | 1 x Tee | - | Butt Weld | ASTM A53 Gr. B | 48 |
| SP-003 | 10" | 2000 | Flanged | - | 1 x Tee | 1 x 10" x 6" | Butt Weld | ASTM A106 Gr. B | 62 |
| SP-004 | 12" | 2200 | Socket Weld | 2 x 90° (SCH 40) | - | 1 x 12" x 8" | Butt Weld | ASTM A333 Gr. 6 | 80 |
| Material | Grade | Pressure-Temperature Ratings (PSI) | Standard | ||||
|---|---|---|---|---|---|---|---|
| -20°F to 100°F | 200°F | 400°F | 600°F | 800°F | |||
| Carbon Steel | ASTM A106 Gr. B | 300 | 275 | 250 | 225 | 200 | ASME B31.3 |
| ASTM A53 Gr. B | 290 | 265 | 240 | 215 | 190 | ||
| ASTM A333 Gr. 6 | 280 | 260 | 230 | 210 | 185 | ||
| Stainless Steel | ASTM A312 TP304 | 400 | 375 | 350 | 320 | 290 | ASME B31.3 |
| ASTM A312 TP316 | 410 | 385 | 360 | 330 | 300 | ||
| ASTM A312 TP321 | 390 | 365 | 340 | 310 | 280 | ||
| Alloy Steel | ASTM A335 P11 | 500 | 470 | 440 | 400 | 360 | ASME B31.1 |
| ASTM A335 P22 | 520 | 490 | 460 | 420 | 380 | ||
| Duplex Steel | ASTM A790 UNS S31803 | 600 | 580 | 550 | 520 | 490 | ASME B31.3 |
| ASTM A790 UNS S32205 | 620 | 600 | 570 | 540 | 510 | ||
| Nickel Alloy | ASTM B366 UNS N06600 | 700 | 680 | 650 | 620 | 590 | ASME B31.3 |
| ASTM B366 UNS N08825 | 720 | 700 | 670 | 640 | 610 | ||
| Material | Pipe Standard | Dimensional Tolerances (mm) | Wall Thickness Tolerances (%) | Standard | ||||
|---|---|---|---|---|---|---|---|---|
| OD (Outer Diameter) | Length (Pipe Cut Tolerance) | End Preparation | Min | Max | Average | |||
| Carbon Steel | ASTM A106 Gr. B | ±0.5 | ±2.0 | ±1.0 | -12.5% | +12.5% | ±10% | ASME B31.3 / B31.1 |
| ASTM A53 Gr. B | ±0.6 | ±2.0 | ±1.2 | -12.5% | +12.5% | ±10% | ||
| ASTM A333 Gr. 6 | ±0.7 | ±2.5 | ±1.5 | -10% | +10% | ±8% | ||
| Stainless Steel | ASTM A312 TP304 | ±0.5 | ±2.0 | ±1.0 | -10% | +10% | ±8% | ASME B31.3 / B31.1 |
| ASTM A312 TP316 | ±0.6 | ±2.0 | ±1.2 | -10% | +10% | ±8% | ||
| ASTM A358 TP321 | ±0.7 | ±2.5 | ±1.5 | -8% | +8% | ±7% | ||
| Duplex Stainless Steel | ASTM A790 UNS S31803 | ±0.6 | ±2.0 | ±1.2 | -10% | +10% | ±8% | ASME B31.3 |
| ASTM A790 UNS S32205 | ±0.7 | ±2.5 | ±1.5 | -8% | +8% | ±7% | ||
| ASTM A790 UNS S32750 | ±0.8 | ±3.0 | ±1.8 | -8% | +8% | ±7% | ||
| Nickel Alloy | ASTM B366 UNS N06600 | ±0.5 | ±2.0 | ±1.0 | -10% | +10% | ±8% | ASME B31.3 |
| ASTM B366 UNS N08825 | ±0.6 | ±2.5 | ±1.2 | -8% | +8% | ±7% | ||
| ASTM B366 UNS N10276 | ±0.7 | ±3.0 | ±1.5 | -8% | +8% | ±7% | ||
Prefabricated piping spools are used in new plant construction, expansion projects and shutdown maintenance wherever site welding needs to be reduced. The spool configuration and material depend on the fluid being carried, operating pressure, temperature and project piping specifications.
Prefabricated piping spools reduce the amount of fabrication work needed at site. For EPC contractors and industrial projects, this can make installation, inspection and shutdown planning easier.
We fabricate piping spools to your approved isometric drawings and project specifications. Our pipe spool fabrication work covers cutting, bevelling, fit-up, welding, flange alignment, branch connections and final assembly. A spool can include valves, fittings, flanges, supports, vents and drains if the drawing calls for them.
Welds and dimensions are inspected during fabrication, with testing carried out as required by the project specification. Each spool is marked and packed so the site crew can identify it and match it to the installation drawing.
Our piping spool fabrication capabilities cover different nominal pipe sizes, wall thickness schedules and custom assembly dimensions according to approved isometric drawings. Maximum spool length, handling weight and monthly production capacity depend on the material, configuration and project requirements. Send us your drawings and quantities so we can confirm fabrication feasibility and delivery schedules.
Straight Pipe Spools are prefabricated pipe sections manufactured for direct installation in industrial piping systems. They are commonly supplied with bevel ends, flanged ends or other specified end connections, allowing faster assembly during construction, plant expansion and shutdown projects. Since each spool is fabricated according to approved isometric drawings and project specifications, installation work at the site becomes quicker and more accurate.
ARK Stainless Inc. manufactures Carbon Steel Straight Pipe Spools, Stainless Steel Straight Pipe Spools, Alloy Steel Straight Pipe Spools, Duplex Steel Straight Pipe Spools, Super Duplex Pipe Spools, Nickel Alloy Pipe Spools, Titanium Pipe Spools and Copper Nickel Pipe Spools for process piping, utility lines and high-pressure industrial applications. Depending on project specifications, straight pipe spools can be supplied with flanges, fittings, valves, supports, vents and drains as part of the assembled spool.
Our straight piping spools are widely supplied for oil & gas plants, refineries, petrochemical facilities, chemical processing units, power generation projects, water treatment plants, offshore platforms, marine piping systems and industrial process plants. Each spool is fabricated according to customer drawings and project specifications to help achieve accurate fit-up and faster installation during construction, maintenance and shutdown projects.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Length (L) | End Type |
|---|---|---|---|
| 1/2" | 21.3 mm | 1000 mm | Beveled |
| 3/4" | 26.7 mm | 1200 mm | Flanged |
| 1" | 33.4 mm | 1500 mm | Plain |
| 1 1/2" | 48.3 mm | 2000 mm | Beveled |
| 2" | 60.3 mm | 2500 mm | Flanged |
| 3" | 88.9 mm | 3000 mm | Beveled |
| 4" | 114.3 mm | 3500 mm | Flanged |
| 6" | 168.3 mm | 4000 mm | Beveled |
| 8" | 219.1 mm | 4500 mm | Flanged |
Elbow piping spools are prefabricated pipe assemblies used where the direction of a pipeline needs to change without carrying out fabrication work on-site. By combining pipe sections and elbows into a ready-to-install assembly, elbow spools help reduce site welding, simplify installation and improve alignment during construction and maintenance projects.
ARK Stainless Inc. manufactures 45° and 90° elbow piping spools in carbon steel, stainless steel, alloy steel, duplex steel, super duplex steel, nickel alloy, Inconel, Monel, Hastelloy, titanium and copper-nickel materials. Each spool is fabricated according to approved piping isometric drawings and project specifications, with bevel ends, flanged ends or custom end connections available to suit the piping system.
Our elbow piping spools are supplied for oil & gas facilities, petrochemical plants, refineries, chemical processing units, power stations, offshore platforms, marine piping systems, water treatment plants and industrial process facilities. Depending on project requirements, the assemblies can be supplied with flanges, valves, branch connections, supports and other welded components to reduce fabrication work during installation.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Center-to-Face (A) 90° Elbow | Center-to-Face (B) 45° Elbow | Wall Thickness (SCH 40) |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 38 mm | 16 mm | 2.77 mm |
| 3/4" | 26.7 mm | 38 mm | 19 mm | 2.87 mm |
| 1" | 33.4 mm | 51 mm | 22 mm | 3.38 mm |
| 1 1/4" | 42.2 mm | 64 mm | 25 mm | 3.56 mm |
| 1 1/2" | 48.3 mm | 76 mm | 29 mm | 3.68 mm |
| 2" | 60.3 mm | 102 mm | 35 mm | 3.91 mm |
| 3" | 88.9 mm | 152 mm | 57 mm | 5.49 mm |
| 4" | 114.3 mm | 203 mm | 76 mm | 6.02 mm |
| 6" | 168.3 mm | 305 mm | 114 mm | 7.11 mm |
| 8" | 219.1 mm | 406 mm | 152 mm | 8.18 mm |
Tee piping spools are prefabricated pipe assemblies used where a branch connection is required within a piping system. They are commonly manufactured in Equal Tee and Reducing Tee configurations to suit different process requirements and pipeline layouts. By fabricating the tee assembly before delivery, site welding is reduced, and installation becomes quicker and more organised.
ARK Stainless Inc. manufactures Equal Tee Piping Spools and Reducing Tee Piping Spools in carbon steel, stainless steel, alloy steel, duplex steel, super duplex steel, nickel alloy, Inconel, Incoloy, Monel, Hastelloy, titanium and copper-nickel materials. Every piping spool is fabricated according to approved isometric drawings, piping layouts and project specifications, with bevel ends, flanged ends or custom end preparations available to match installation requirements.
Our tee piping spools are supplied for oil & gas plants, refineries, petrochemical facilities, chemical processing units, power generation projects, offshore platforms, marine piping systems, water treatment plants and other industrial piping applications where branch connections are required for process lines, utility piping and distribution networks. Depending on the project scope, the spool assembly can also include flanges, valves, reducers, vents, drains, supports and other welded components.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Run Center-to-End (A) | Branch Center-to-End (B) | Wall Thickness (SCH 40) |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 25 mm | 25 mm | 2.77 mm |
| 3/4" | 26.7 mm | 29 mm | 29 mm | 2.87 mm |
| 1" | 33.4 mm | 38 mm | 38 mm | 3.38 mm |
| 1 1/4" | 42.2 mm | 48 mm | 48 mm | 3.56 mm |
| 1 1/2" | 48.3 mm | 57 mm | 57 mm | 3.68 mm |
| 2" | 60.3 mm | 64 mm | 64 mm | 3.91 mm |
| 3" | 88.9 mm | 76 mm | 76 mm | 5.49 mm |
| 4" | 114.3 mm | 95 mm | 95 mm | 6.02 mm |
| 6" | 168.3 mm | 143 mm | 143 mm | 7.11 mm |
| 8" | 219.1 mm | 191 mm | 191 mm | 8.18 mm |
Reducer piping spools are fabricated where a pipeline needs to transition between different pipe sizes without affecting the overall piping layout. Depending on the flow requirements and installation arrangement, these assemblies are manufactured with concentric reducers or eccentric reducers and supplied as ready-to-install spool sections for industrial piping systems.
ARK Stainless Inc. manufactures Concentric Reducer Piping Spools and Eccentric Reducer Piping Spools in carbon steel, stainless steel, alloy steel, duplex steel, super duplex steel, nickel alloy, Inconel, Incoloy, Monel, Hastelloy, titanium and copper-nickel materials. Each piping spool is fabricated according to approved isometric drawings, piping layouts and project specifications, with bevel ends, flanged ends or custom end connections available to suit different process requirements.
Reducer piping spools are regularly supplied for oil & gas plants, petrochemical facilities, refineries, chemical processing units, power stations, offshore platforms, marine piping systems, water treatment plants and other industrial process applications where changes in pipe size are required while maintaining efficient flow through the system. Depending on the project scope, spool assemblies can include flanges, valves, elbows, supports, vents, drains and other fabricated components ready for installation.
| Nominal Pipe Size (NPS) | Large End Diameter (D1) | Small End Diameter (D2) | Reducer Length (H) | Wall Thickness (SCH 40) |
|---|---|---|---|---|
| 2" x 1" | 60.3 mm | 33.4 mm | 76 mm | 3.91 mm |
| 3" x 2" | 88.9 mm | 60.3 mm | 89 mm | 5.49 mm |
| 4" x 2" | 114.3 mm | 60.3 mm | 102 mm | 6.02 mm |
| 6" x 4" | 168.3 mm | 114.3 mm | 127 mm | 7.11 mm |
| 8" x 6" | 219.1 mm | 168.3 mm | 152 mm | 8.18 mm |
| 10" x 8" | 273.0 mm | 219.1 mm | 178 mm | 9.27 mm |
| 12" x 10" | 323.9 mm | 273.0 mm | 203 mm | 9.52 mm |
Flanged piping spools are prefabricated pipe assemblies manufactured with flanges at one or both ends to simplify installation, maintenance and future pipeline modifications. They are widely used where bolted flange connections are preferred over field welding, allowing faster assembly and easier dismantling during plant shutdowns and maintenance activities.
ARK Stainless Inc. manufactures Flanged Piping Spools in carbon steel, stainless steel, alloy steel, duplex steel, super duplex steel, nickel alloy, Inconel, Incoloy, Monel, Hastelloy, titanium and copper-nickel materials for industrial piping systems. Each spool is fabricated according to approved isometric drawings, piping layouts and project specifications, with flange facing, drilling and dimensions manufactured to the applicable international standards.
Our flanged piping spools are regularly supplied for oil & gas plants, refineries, petrochemical facilities, chemical processing units, power generation projects, offshore platforms, marine piping systems, water treatment plants and other industrial process applications. Depending on the project requirements, the spool assemblies can be supplied with elbows, reducers, tees, valves, supports, vents, drains and other welded components ready for installation.
| Nominal Pipe Size (NPS) | Flange Outer Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Spool Length (Customizable) |
|---|---|---|---|---|---|
| 1/2" | 89 mm | 60.3 mm | 4 | 15.7 mm | Custom |
| 1" | 114 mm | 79.4 mm | 4 | 15.7 mm | Custom |
| 2" | 165 mm | 127.0 mm | 4 | 19.0 mm | Custom |
| 4" | 279 mm | 215.9 mm | 8 | 22.4 mm | Custom |
| 6" | 356 mm | 269.9 mm | 8 | 25.4 mm | Custom |
| 8" | 419 mm | 330.2 mm | 8 | 28.4 mm | Custom |
| 10" | 508 mm | 387.4 mm | 12 | 31.8 mm | Custom |
| 12" | 610 mm | 450.8 mm | 12 | 34.9 mm | Custom |
A pipe fitting is an individual component, such as an elbow, tee, reducer or flange. A piping spool is a prefabricated assembly of pipes and fittings, joined together according to a drawing. Instead of welding every component at site, the installation crew receives an assembly with much of the fabrication work already completed.
Yes. ARK Stainless Inc. undertakes custom pipe spool fabrication according to approved isometric drawings, piping classes and project specifications. We review the pipe sizes, wall thicknesses, material grades, fittings, flange details and weld requirements before fabrication. If a drawing is incomplete or needs clarification, we raise it before proceeding.
We manufacture straight pipe spools, flanged piping spools, elbow spools, tee and branch spools, reducer spools, valve spools and equipment connection spools. Custom assemblies can include multiple bends, branches, instrument connections, vents, drains and supports, depending on the approved drawing.
Our piping spool range covers carbon steel, stainless steel, alloy steel, duplex, super duplex and specified special alloys. Common requirements include SS 304/304L, SS 316/316L, ASTM A106 Gr. B, P11, P22, P91 and Duplex 2205. Nickel alloys, titanium and copper-nickel may also be considered for project-specific requirements. Material availability and fabrication scope are confirmed against the enquiry.
Pipe spool sizes and wall thicknesses depend on the material, spool configuration and project requirements. Common enquiries specify SCH 10, SCH 40, SCH 80 and heavier schedules. Send us the nominal pipe size (NPS/DN), wall thickness or schedule, drawing and quantity so we can confirm whether the assembly is within our fabrication capabilities.
Inspection and testing depend on the project specification. Requirements may include visual and dimensional inspection, radiographic testing (RT), ultrasonic testing (UT), liquid penetrant testing (PT), positive material identification (PMI) and hydrostatic testing. Share the applicable inspection and test plan (ITP) or testing requirements with your enquiry so we can confirm the available scope.
The applicable standards depend on the piping system and project requirements. Industrial process piping projects commonly specify ASME B31.3, while welding procedure and welder qualifications may reference ASME Section IX. Material, flange and fitting standards are also identified in the piping specification. Tell us which codes and editions your project requires before fabrication.
We check spool dimensions, branch orientation and flange alignment against the approved fabrication drawing. Face-to-face dimensions, flange rotation and connection positions matter, particularly when a spool must fit between existing equipment. The applicable dimensional tolerances should be stated in the project specification.
The price depends on more than pipe length. Material grade, pipe diameter, wall thickness, number of welds, fittings, flanges, spool complexity and quantity all affect fabrication cost. Special welding procedures, NDT, pressure testing, surface treatment and inspection documentation can add to the price. An isometric drawing and material specification give us a much better basis for quotation than pipe size alone.
Yes. We handle enquiries for replacement piping spools, plant expansion work and shutdown maintenance projects. Where the existing pipework must remain in place, accurate dimensions and connection details are particularly important. Send us the approved replacement drawing or site measurements with the required delivery date so we can review the job.
Yes. ARK Stainless Inc. is based in Mumbai, India, and handles domestic and export enquiries for prefabricated piping spools. EPC contractors and project buyers can send drawings, material take-offs (MTOs), fabrication specifications, quantities and delivery destinations for review. Packing, inspection documentation and shipment requirements should be agreed upon before order confirmation.
