Specialized Products
ARK Stainless Inc. is a renowned Manufacturer and Exporter of high-quality Specialized Pipe Fittings and Components, headquartered in Mumbai, India.
Our specialized products are engineered to meet complex industrial applications, ensuring precision, durability, and superior performance.
We manufacture a diverse range of customized fittings, including Swage Nipples, Cross Tees, Barred Tees, Lateral Tees, Split Tees, Hemispherical Reducers, and Barred Nipples.
These products are designed to withstand high pressure, extreme temperatures, and demanding environments, making them ideal for industries such as Oil & Gas, Petrochemicals, Power Plants, and Water Treatment.
With a strong focus on innovation and quality assurance, ARK Stainless Inc. delivers solutions that enhance the efficiency and safety of complex piping systems.
Swage Nipple
A Swage Nipple is a pipe fitting used for reducing the pipe size in a piping system. It is similar to a reducer but comes with threaded or beveled ends to facilitate easy connections.
Swage Nipples are widely used in industries like Oil & Gas, Petrochemicals, Power Plants, and Water Treatment for high-pressure and high-temperature applications.
These fittings are manufactured in concentric and eccentric types, allowing smooth fluid transition while minimizing turbulence and pressure loss.
They are available in a variety of materials, including stainless steel, carbon steel, alloy steel, and duplex steel, ensuring durability and corrosion resistance.
Key Features:
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1. Available in Concentric and Eccentric types to suit different piping layouts.
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2. Manufactured with threaded, beveled, or plain ends for seamless connection.
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3. Suitable for high-pressure and high-temperature applications.
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4. Used extensively in oil & gas, petrochemical, power plants, and water treatment industries.
Standard Dimensions & Specifications (ASME B16.11)
| Nominal Pipe Size (NPS) |
Large End OD |
Small End OD |
Overall Length (L) |
Type |
| 1/2" x 1/4" |
21.3 mm |
13.7 mm |
76 mm |
Concentric |
| 3/4" x 1/2" |
26.7 mm |
21.3 mm |
89 mm |
Eccentric |
| 1" x 3/4" |
33.4 mm |
26.7 mm |
102 mm |
Concentric |
| 2" x 1" |
60.3 mm |
33.4 mm |
152 mm |
Eccentric |
| 3" x 2" |
88.9 mm |
60.3 mm |
178 mm |
Concentric |
Material Grades & Applications
| Material Type |
Grade |
Common Applications |
| Stainless Steel |
ASTM A403 WP304, WP316 |
Corrosive environments, chemical processing |
| Carbon Steel |
ASTM A234 WPB |
Oil & gas, power plants, high-pressure systems |
| Alloy Steel |
ASTM A182 F5, F9, F11 |
High-temperature, high-strength applications |
| Duplex Steel |
ASTM A815 UNS S31803, S32750 |
Marine, offshore, highly corrosive industries |
Cross Tee
A Cross Tee, also known as a four-way fitting, is a pipe fitting used to connect four pipes at 90-degree angles. It has one inlet and three outlets (or vice versa), making it ideal for fluid distribution or collection systems. These tees are extensively used in industrial pipelines, HVAC systems, fire protection networks, and plumbing systems where multiple flow directions are required.
Cross Tees are available in various materials such as stainless steel, carbon steel, alloy steel, and duplex steel, making them suitable for different pressure and temperature applications. They can be manufactured with butt-weld, socket-weld, or threaded ends, depending on the installation requirements.
Key Features:
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1. Used to connect four pipes at 90-degree angles for fluid distribution.
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2. Available in seamless and welded construction, depending on the application.
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3. Manufactured using stainless steel, carbon steel, alloy steel, and duplex steel.
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4. Designed for high-pressure and high-temperature environments.
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5. Commonly used in oil & gas, chemical, water treatment, and fire protection systems.
Dimensions & Specifications Table (ASME B16.9 Standard):
| Nominal Pipe Size (NPS) |
Outside Diameter (OD) |
Wall Thickness (Sch 40) |
Center-to-End Dimension (C) |
| 1/2" |
21.3 mm |
2.77 mm |
25 mm |
| 3/4" |
26.7 mm |
2.87 mm |
29 mm |
| 1" |
33.4 mm |
3.38 mm |
38 mm |
| 1 1/2" |
48.3 mm |
3.68 mm |
57 mm |
| 2" |
60.3 mm |
3.91 mm |
64 mm |
| 3" |
88.9 mm |
5.49 mm |
76 mm |
| 4" |
114.3 mm |
6.02 mm |
102 mm |
Pressure Ratings & Material Standards:
| Material |
Pressure Class (PSI) |
Temperature Rating (°C) |
ASTM Standard |
| Stainless Steel (SS 304/316) |
1500 PSI |
-20°C to 650°C |
ASTM A403 |
| Carbon Steel (A234 WPB) |
2000 PSI |
-29°C to 427°C |
ASTM A234 |
| Alloy Steel (A182 F22) |
2500 PSI |
-46°C to 593°C |
ASTM A182 |
| Duplex Steel (2205/2507) |
3000 PSI |
-50°C to 315°C |
ASTM A815 |
Barred Tee
A Barred Tee is a specialized pipe fitting used in pigging pipelines where flow direction changes. It is designed with internal bars to prevent pipeline pigs (cleaning devices) from entering branch connections, ensuring smooth operation. Barred Tees are commonly used in oil & gas pipelines, petrochemical plants, and process industries.
These tees are available in seamless and welded types, made from materials like carbon steel, stainless steel, alloy steel, and duplex steel. They are designed following ASME B16.9, MSS SP-75, and API 5L standards to ensure high performance in demanding applications.
Key Features:
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1. Designed to block pipeline pigs from entering branch connections.
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2. Manufactured as per ASME B16.9, MSS SP-75, and API 5L standards.
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3. Available in seamless and welded configurations.
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4. Commonly used in pigging pipelines, oil & gas industries, and process plants.
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5. Made from carbon steel, stainless steel, alloy steel, and duplex steel.
Dimensions & Specifications Table (ASME B16.9 Standard):
| Nominal Pipe Size (NPS) |
Outside Diameter (OD) |
Wall Thickness (Sch 40) |
Center-to-End Dimension (C) |
Bar Thickness |
| 2" |
60.3 mm |
3.91 mm |
64 mm |
10 mm |
| 3" |
88.9 mm |
5.49 mm |
76 mm |
12 mm |
| 4" |
114.3 mm |
6.02 mm |
102 mm |
14 mm |
| 6" |
168.3 mm |
7.11 mm |
152 mm |
18 mm |
| 8" |
219.1 mm |
8.18 mm |
203 mm |
22 mm |
Pressure Ratings & Material Standards:
| Material |
Pressure Class (PSI) |
Temperature Rating (°C) |
ASTM Standard |
| Carbon Steel (A234 WPB) |
2000 PSI |
-29°C to 427°C |
ASTM A234 |
| Stainless Steel (SS 304/316) |
1500 PSI |
-20°C to 650°C |
ASTM A403 |
| Alloy Steel (A182 F22) |
2500 PSI |
-46°C to 593°C |
ASTM A182 |
| Duplex Steel (2205/2507) |
3000 PSI |
-50°C to 315°C |
ASTM A815 |
Lateral Tee
A Lateral Tee is a type of pipe fitting used to create a 45-degree branch from the main pipeline. Unlike standard tees, which create a 90-degree branch, lateral tees allow for a more gradual flow transition, reducing turbulence and pressure loss.
These tees are widely used in fluid transportation, HVAC systems, oil & gas pipelines, and process industries. They are manufactured from materials like carbon steel, stainless steel, alloy steel, and duplex steel and conform to ASME B16.9, MSS SP-75, and API 5L standards.
Key Features:
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1. Creates a 45-degree branch for smoother fluid flow.
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2. Reduces turbulence and pressure drop compared to standard tees.
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3. Manufactured in accordance with ASME B16.9, MSS SP-75, and API 5L.
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4. Available in seamless and welded configurations.
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5. Commonly used in HVAC, oil & gas, water treatment, and chemical industries.
Dimensions & Specifications Table (ASME B16.9 Standard):
| Nominal Pipe Size (NPS) |
Outside Diameter (OD) |
Wall Thickness (Sch 40) |
Center-to-End Dimension (C) |
Branch Angle |
| 2" |
60.3 mm |
3.91 mm |
64 mm |
45° |
| 3" |
88.9 mm |
5.49 mm |
76 mm |
45° |
| 4" |
114.3 mm |
6.02 mm |
102 mm |
45° |
| 6" |
168.3 mm |
7.11 mm |
152 mm |
45° |
| 8" |
219.1 mm |
8.18 mm |
203 mm |
45° |
Pressure Ratings & Material Standards:
| Material |
Pressure Class (PSI) |
Temperature Rating (°C) |
ASTM Standard |
| Carbon Steel (A234 WPB) |
2000 PSI |
-29°C to 427°C |
ASTM A234 |
| Stainless Steel (SS 304/316) |
1500 PSI |
-20°C to 650°C |
ASTM A403 |
| Alloy Steel (A182 F22) |
2500 PSI |
-46°C to 593°C |
ASTM A182 |
| Duplex Steel (2205/2507) |
3000 PSI |
-50°C to 315°C |
ASTM A815 |
Split Tee
A Split Tee is a specialized pipe fitting used for hot tapping and pipeline modifications without interrupting the flow of the pipeline. It consists of two halves welded around the main pipe, creating a branch connection for new pipe installations, repairs, or maintenance operations.
Split tees are commonly used in oil & gas, petrochemical, water distribution, and high-pressure pipeline systems. They are available in materials like carbon steel, stainless steel, and alloy steel and adhere to standards such as ASME B31.8, API 1104, and MSS SP-75.
Key Features:
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1. Designed for hot tapping, allowing modifications without stopping pipeline operations.
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2. Split design allows installation on existing pipelines.
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3. Available in welded and bolted configurations.
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4. Manufactured according to ASME, API, and MSS standards.
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5. Used in pipeline maintenance, branch connections, and high-pressure systems.
Dimensions & Specifications Table (ASME B31.8 Standard):
| Nominal Pipe Size (NPS) |
Run Pipe OD (Main Pipe) |
Branch Pipe OD |
Wall Thickness (Sch 40) |
Split Tee Length (L) |
| 4" |
114.3 mm |
60.3 mm |
6.02 mm |
152 mm |
| 6" |
168.3 mm |
88.9 mm |
7.11 mm |
203 mm |
| 8" |
219.1 mm |
114.3 mm |
8.18 mm |
254 mm |
| 10" |
273.0 mm |
141.3 mm |
9.27 mm |
305 mm |
| 12" |
323.9 mm |
168.3 mm |
10.31 mm |
356 mm |
Pressure Ratings & Material Standards:
| Material |
Pressure Class (PSI) |
Temperature Rating (°C) |
ASTM Standard |
| Carbon Steel (A234 WPB) |
2000 PSI |
-29°C to 427°C |
ASTM A234 |
| Stainless Steel (SS 304/316) |
1500 PSI |
-20°C to 650°C |
ASTM A403 |
| Alloy Steel (A182 F22) |
2500 PSI |
-46°C to 593°C |
ASTM A182 |
| Duplex Steel (2205/2507) |
3000 PSI |
-50°C to 315°C |
ASTM A815 |
Hemispherical Reducer
A Hemispherical Reducer is a custom-engineered pipe fitting designed for smooth flow transition between different pipe sizes. Its hemispherical shape enhances pressure resistance, structural integrity, and fluid optimization, making it suitable for high-pressure applications.
These reducers are widely used in oil & gas, chemical processing, power plants, and pressure vessel manufacturing. They are available in materials like stainless steel, carbon steel, duplex steel, and alloy steel, complying with ASME and ASTM standards.
Key Features:
1. Reduces turbulence and improves fluid efficiency.
2. Withstands high pressure and extreme temperatures.
3. Available in custom sizes and material grades.
4. Used in pipeline optimization and pressure vessel applications.
5. Manufactured to ASME, ASTM, and API standards.
Dimensions & Specifications:
| NPS (inches) |
Large End (D1) |
Small End (D2) |
Height (H) |
Wall Thickness |
Material |
| 2" | 60.3 mm | 33.4 mm | 75 mm | Sch 40 | SS 304 |
| 4" | 114.3 mm | 60.3 mm | 120 mm | Sch 80 | CS A234 WPB |
| 6" | 168.3 mm | 88.9 mm | 150 mm | Sch 160 | Duplex 2205 |
| 8" | 219.1 mm | 114.3 mm | 200 mm | XXS | Alloy Steel A335 P11 |
Barred Nipple
A Barred Nipple is a specialized pipe fitting designed for pigging operations in pipelines. It prevents the pipeline pig from entering branch connections, ensuring smooth flow and pipeline integrity. This fitting consists of a standard pipe nipple with internal bars that act as a restriction for the pig while allowing fluid or gas to pass through.
Barred Nipples are commonly used in oil & gas, petrochemical, and water distribution pipelines. They are available in various materials, including carbon steel, stainless steel, and alloy steel, and are manufactured according to industry standards such as ASME B31.3, API 5L, and MSS SP-97.
Key Features:
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1. Prevents pipeline pigs from entering branch connections.
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2. Available in threaded, welded, and flanged end connections.
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3. Designed according to API, ASME, and MSS standards.
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4. Manufactured from carbon steel, stainless steel, and alloy steel.
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5. Used in pigging systems, flow control, and pipeline maintenance.
Dimensions & Specifications Table (ASME B31.3 Standard):
| Nominal Pipe Size (NPS) |
Outer Diameter (OD) |
Wall Thickness (Sch 40) |
Length (L) |
Bar Spacing |
| 2" |
60.3 mm |
3.91 mm |
150 mm |
20 mm |
| 4" |
114.3 mm |
6.02 mm |
200 mm |
25 mm |
| 6" |
168.3 mm |
7.11 mm |
250 mm |
30 mm |
| 8" |
219.1 mm |
8.18 mm |
300 mm |
35 mm |
| 10" |
273.0 mm |
9.27 mm |
350 mm |
40 mm |
Pressure Ratings & Material Standards:
| Material |
Pressure Class (PSI) |
Temperature Rating (°C) |
ASTM Standard |
| Carbon Steel (A105) |
1500 PSI |
-29°C to 427°C |
ASTM A105 |
| Stainless Steel (SS 304/316) |
2000 PSI |
-20°C to 650°C |
ASTM A403 |
| Alloy Steel (A182 F22) |
2500 PSI |
-46°C to 593°C |
ASTM A182 |
| Duplex Steel (2205/2507) |
3000 PSI |
-50°C to 315°C |
ASTM A815 |
