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Buttweld Fitting

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Buttweld Fitting

Stainless Steel Duplex & Super Duplex Steel Inconel Monel Nickel Alloy Hastelloy Carbon Steel Alloy Steel Titanium Copper Nickel

Piping Division

Buttweld Fitting Forged Fitting Piping Spools SWAGE NIPPLE CROSS TEE BARRED TEE LATERAL TEE SPLIT TEE HEMISPEREICAL REDUER BARRED NIPPLE

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Buttweld Fittings

ARK Stainless Inc. is a leading Manufacturer and Exporter of high-quality Buttweld Fittings located in Mumbai, India. We specialize in manufacturing Buttweld Fittings using the finest raw materials, rigorously tested and controlled by our skilled professionals to ensure unparalleled performance and durability.

Each of our Buttweld Fittings is made in strict accordance with both National and International Industrial Standards, ensuring that our customers receive products that are not only reliable but also long-lasting. Our commitment to quality and excellence has made us a trusted supplier to a wide range of industries across the globe.

Available Grades of Buttweld Fittings

Material Standard Available Grades
1 2 3 4 5 6 7 8 9 10
Stainless Steel ASTM A403 WP 304 304H 309 310 316 316L 317L 321 347 904L
ASTM A815 / ASME SA 815 Duplex 2205 - UNS S31803, S32205 Duplex 2304 - UNS S32304 Duplex 2507
Alloy Steel ASTM / ASME A/SA 234 WP 1 WP 11 WP 12 WP 22 WP 91 WP 5 WP 9
Alloy 1100 2011 2014 2024 3003 5052 6061 6063 7075
Carbon Steel ASTM A 234 WPB WPBW WPHY 42 WPHY 46 WPHY 52 WPHY 60 WPHY 65 WPHY 70
ASTM / ASME SB 336 Inconel 600 MONEL 400 ALLOY 20 Inconel 825 Inconel 601 Inconel 625 Nickel 200 Hastelloy C 276 Nickel 201

Comprehensive Data Table

Material Grades Size Range (NPS) Wall Thickness (mm) Weight per Meter (kg) Chemical Composition (%)
C Mn Cr Ni Other
Stainless Steel 304, 304L, 316, 316L ½” - 24” 2.77 - 15.88 1.27 - 150.30 ≤0.08 2.00 18-20 8-10.5 Si: 1.00
321, 347, 317L ½” - 24” 3.18 - 14.27 1.55 - 145.20 ≤0.08 2.00 17-19 9-13 Si: 1.00
Carbon Steel ASTM A234 WPB, WPC ½” - 48” 2.77 - 20.62 1.45 - 320.80 ≤0.30 1.00 - - Fe: Balance
ASTM A860 WPHY 42-70 ½” - 48” 3.18 - 22.23 1.98 - 410.35 ≤0.12 1.10-1.40 ≤0.50 ≤0.50 -
Duplex Steel UNS S31803, S32205 ½” - 36” 3.91 - 15.88 2.10 - 180.75 ≤0.03 2.00 21-23 4.5-6.5 Mo: 2.5-3.5
Super Duplex Steel UNS S32750, S32760 ½” - 36” 3.91 - 20.00 2.20 - 195.60 ≤0.03 1.20 24-26 6-8 Mo: 3-4.5
Nickel Alloy 200, 201 ½” - 30” 2.77 - 14.27 1.60 - 122.50 ≤0.15 0.35 - 99.0 Fe: Balance
Monel 400, K500 ½” - 30” 2.90 - 15.88 1.90 - 130.45 ≤0.30 2.00 - Balance Cu: 28-34
Titanium Alloy Gr.1, Gr.2, Gr.5, Gr.7 ½” - 24” 3.18 - 10.31 2.10 - 85.45 ≤0.08 - - 99.2 Mn: 0.03, Si: 0.15
Cupro-Nickel Alloy 90/10, 70/30 ½” - 36” 2.77 - 12.70 1.85 - 98.60 ≤0.10 1.00 - 9-11 Cu: 88

Dimensional Standards Table

Fitting Type Size (Inch) Dimensions (mm) Wall Thickness (SCH 40) Standard
Outer Diameter (OD) Center-to-End (C)
Elbow 90° 1/2" 21.3 38 2.77 ASME B16.9
3/4" 26.7 38 2.87
1" 33.4 38 3.38
Elbow 45° 1/2" 21.3 16 2.77 ASME B16.9
3/4" 26.7 22 2.87
1" 33.4 25 3.38
Tee 1/2" 21.3 25 2.77 ASME B16.9
3/4" 26.7 29 2.87
1" 33.4 38 3.38
Reducer 1/2" x 3/8" 21.3 x 17.1 25 2.77 ASME B16.9
3/4" x 1/2" 26.7 x 21.3 29 2.87
1" x 3/4" 33.4 x 26.7 38 3.38
End Cap 1/2" 21.3 25 2.77 ASME B16.9
3/4" 26.7 29 2.87
1" 33.4 38 3.38

Pressure-Temperature Ratings Table

Material Grade Pressure-Temperature Ratings (PSI) Standard
-20°F to 100°F 200°F 400°F 600°F 800°F
Stainless Steel ASTM A403 WP304 150 125 110 95 80 ASME B16.5
ASTM A403 WP316 160 135 120 100 85
ASTM A403 WP321 155 130 115 98 82
ASTM A403 WP347 158 132 118 99 83
Carbon Steel ASTM A234 WPB 140 120 100 85 70 ASME B16.9
ASTM A234 WPC 145 123 103 87 72
ASTM A420 WPL6 150 127 107 90 75
ASTM A860 WPHY52 170 140 120 100 85
Duplex Steel ASTM A815 UNS S31803 180 150 130 110 95 ASME B16.9
ASTM A815 UNS S32205 190 160 140 115 100
ASTM A815 UNS S32750 200 170 150 125 110
Nickel Alloy ASTM B366 UNS N06600 210 180 160 140 120 ASME B16.9
ASTM B366 UNS N08825 220 190 170 150 130
ASTM B366 UNS N10276 230 200 180 160 140

Tolerances Table

Material Grade Dimensional Tolerances (mm) Wall Thickness Tolerances (%) Standard
OD (Outer Diameter) ID (Inner Diameter) Length Min Max Average
Stainless Steel ASTM A403 WP304 ±0.5 ±0.4 ±1.0 -12.5% +12.5% ±10% ASME B16.9
ASTM A403 WP316 ±0.6 ±0.5 ±1.2 -12.5% +12.5% ±10%
ASTM A403 WP321 ±0.7 ±0.6 ±1.5 -10% +10% ±8%
ASTM A403 WP347 ±0.8 ±0.7 ±1.8 -10% +10% ±8%
Carbon Steel ASTM A234 WPB ±0.5 ±0.3 ±1.0 -12.5% +12.5% ±10% ASME B16.9
ASTM A234 WPC ±0.6 ±0.4 ±1.2 -12.5% +12.5% ±10%
ASTM A420 WPL6 ±0.7 ±0.5 ±1.4 -12.5% +12.5% ±10%
Duplex Steel ASTM A815 UNS S31803 ±0.6 ±0.4 ±1.2 -10% +10% ±8% ASME B16.9
ASTM A815 UNS S32205 ±0.7 ±0.5 ±1.5 -10% +10% ±8%
ASTM A815 UNS S32750 ±0.8 ±0.6 ±1.8 -8% +8% ±7%
Nickel Alloy ASTM B366 UNS N06600 ±0.5 ±0.3 ±1.0 -12.5% +12.5% ±10% ASME B16.9
ASTM B366 UNS N08825 ±0.6 ±0.4 ±1.2 -10% +10% ±8%
ASTM B366 UNS N10276 ±0.7 ±0.5 ±1.4 -8% +8% ±7%

Applications of Buttweld Fittings

Buttweld pipe fittings are widely used in various industries due to their high strength, durability, and leak-proof connections. Some of the key applications include:

Industrial Applications:
  • Oil & Gas Industry:

    Used in pipelines for transporting crude oil, natural gas, and petroleum products.

  • Petrochemical & Refineries:

    Essential for processing plants handling chemicals, fuels, and hydrocarbons.

  • Power Plants:

    Applied in thermal, nuclear, and renewable energy sectors for steam and fluid transportation.

  • Water Treatment Plants:

    Used in desalination and purification plants to ensure corrosion-resistant piping.

  • Pharmaceutical Industry:

    Ensures hygienic and contamination-free fluid transportation.

  • Food & Beverage Industry:

    Stainless steel buttweld fittings are preferred for their hygienic and corrosion-resistant properties.

  • Shipbuilding & Marine:

    Used for seawater pipelines, ballast systems, and offshore drilling.

  • Construction & Infrastructure:

    Essential for underground and overhead pipeline networks in cities.

Manufacturing Process of Buttweld Fittings

The manufacturing process of buttweld fittings involves several precise steps to ensure strength, durability, and compliance with industry standards. The process includes cutting, heating, forming, machining, and testing to produce high-quality fittings.

Step-by-Step Manufacturing Process:
  • 1. Raw Material Selection:

    High-quality seamless or welded pipes are selected based on material specifications such as stainless steel, carbon steel, duplex steel, nickel alloys, etc.

  • 2. Cutting & Shaping:

    Pipes are cut into specific lengths using band saw cutting, plasma cutting, or water jet cutting to match the required fitting size.

  • 3. Heating & Forming:

    The cut pipe is heated in a furnace to a specific temperature and formed into elbows, tees, reducers, or caps using hydraulic presses or induction bending.

  • 4. Heat Treatment:

    Annealing or normalizing is done to enhance mechanical properties, relieve stress, and improve corrosion resistance.

  • 5. Machining & Finishing:

    CNC machining, grinding, and beveling are performed to achieve precise dimensions, smooth surfaces, and proper welding end preparation.

  • 6. Inspection & Testing:

    Non-destructive testing (NDT), ultrasonic testing (UT), hydrostatic testing, and positive material identification (PMI) are conducted to ensure quality.

  • 7. Surface Treatment & Coating:

    Pickling & passivation for stainless steel and galvanization or epoxy coating for carbon steel to improve corrosion resistance.

  • 8. Packaging & Dispatch:

    Fittings are packed securely, labeled with material specifications, and shipped to customers ensuring safe handling and delivery.

Types of Buttweld Fittings

Elbow (90°, 45°, 180°, Male/Female)

An elbow is a type of buttweld pipe fitting used to change the direction of flow in a pipeline. The most common types are 90-degree, 45-degree, and 180-degree elbows, which allow for various directional changes. Additionally, male and female elbows are used for specific joint connections. These fittings ensure smooth fluid flow and are commonly used in industries such as oil & gas, petrochemicals, and power plants.

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Key Features:
  • 1. Available in different angles (90°, 45°, 180°) to suit various piping layouts.
  • 2. Designed for seamless or welded applications.
  • 3. Manufactured in materials like stainless steel, carbon steel, alloy steel, and duplex steel.
  • 4. Provides excellent resistance to corrosion and high-pressure environments.
  • 5. Male and Female Elbows are used for threaded connections in certain applications.

Dimensions & Specifications Table (ASME B16.9 Standard):

Nominal Pipe Size (NPS) Outside Diameter (OD) Center-to-End (90° Elbow) (A) Center-to-End (45° Elbow) (B) Center-to-Center (180° Elbow) (C)
1/2" 21.3 mm 38 mm 16 mm 76 mm
3/4" 26.7 mm 38 mm 19 mm 76 mm
1" 33.4 mm 38 mm 22 mm 76 mm
1 1/4" 42.2 mm 48 mm 25 mm 95 mm
1 1/2" 48.3 mm 57 mm 29 mm 114 mm
2" 60.3 mm 76 mm 35 mm 152 mm
3" 88.9 mm 114 mm 51 mm 229 mm
4" 114.3 mm 152 mm 64 mm 305 mm
6" 168.3 mm 229 mm 95 mm 457 mm
8" 219.1 mm 305 mm 127 mm 610 mm

Tee (Equal Tee, Reducing Outlet Tee)

A tee is a buttweld pipe fitting used to combine or split the flow of fluids in a pipeline. It has three openings – one inlet and two outlets at 90° angles to the main line. There are two main types: Equal Tee, where all three outlets have the same diameter, and Reducing Outlet Tee, where one branch outlet has a smaller diameter than the main pipe. These fittings are widely used in plumbing, chemical, oil & gas, and water distribution applications.

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Key Features:
  • 1. Available in Equal and Reducing configurations for different piping needs.
  • 2. Used for distributing or collecting fluid flow in various applications.
  • 3. Manufactured in Stainless Steel, Carbon Steel, Alloy Steel, and Duplex Steel.
  • 4. Complies with ASME B16.9 standards for industrial use.
  • 5. Available in seamless and welded forms.

Dimensions & Specifications Table (ASME B16.9 Standard):

Nominal Pipe Size (NPS) Outside Diameter (OD) Center-to-End (A) 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

Cross (Equal Cross, Reducing Cross)

A Cross is a buttweld pipe fitting used where four pipes meet at a common junction. It has one inlet and three outlets (or vice versa) positioned at 90° angles to each other. The two main types include Equal Cross, where all four ends have the same diameter, and Reducing Cross, where one or more branch outlets have a smaller diameter than the main line. Cross fittings are widely used in fire sprinkler systems, chemical processing plants, and high-pressure applications.

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Key Features:
  • 1. Used for multi-directional fluid distribution in piping networks.
  • 2. Available in Equal and Reducing configurations for different applications.
  • 3. Manufactured using Stainless Steel, Carbon Steel, Alloy Steel, and Duplex Steel.
  • 4. Complies with ASME B16.9 and MSS SP-75 standards.
  • 5. Suitable for high-pressure and high-temperature environments.

Dimensions & Specifications Table (ASME B16.9 Standard):

Nominal Pipe Size (NPS) Outside Diameter (OD) Center-to-End (A) 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

Cap (Pipe End Cap)

A Pipe Cap is a buttweld fitting used to close the end of a pipe, stopping the flow of fluids or gases. It protects pipe ends from damage, contaminants, and environmental exposure. Caps are commonly used in plumbing, industrial piping, and high-pressure applications to provide a secure, leak-proof seal.

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Key Features:
  • 1. Seals the end of pipes in both permanent and temporary applications.
  • 2. Available in various materials like Stainless Steel, Carbon Steel, Alloy Steel, and Duplex Steel.
  • 3. Designed for high-pressure and high-temperature environments.
  • 4. Manufactured according to ASME B16.9, MSS SP-75, and DIN standards.
  • 5. Smooth, rounded shape to reduce stress concentration.

Dimensions & Specifications Table (ASME B16.9 Standard):

Nominal Pipe Size (NPS) Outside Diameter (OD) End Cap Height (H) Wall Thickness (SCH 40)
1/2" 21.3 mm 25 mm 2.77 mm
3/4" 26.7 mm 29 mm 2.87 mm
1" 33.4 mm 38 mm 3.38 mm
1 1/2" 48.3 mm 57 mm 3.68 mm
2" 60.3 mm 64 mm 3.91 mm
3" 88.9 mm 76 mm 5.49 mm
4" 114.3 mm 95 mm 6.02 mm
6" 168.3 mm 143 mm 7.11 mm
8" 219.1 mm 191 mm 8.18 mm
10" 273.0 mm 229 mm 9.27 mm
12" 323.9 mm 267 mm 9.52 mm

Stub End (Lap-Joint Stub End)

A stub end is a short pipe fitting used in combination with a lap joint flange to create a flanged connection that allows easy dismantling and rotation. It is commonly used in systems that require frequent disassembly for maintenance or alignment adjustments.

Lap-Joint Stub End is a specific subtype designed to work with a lap joint flange. It provides flexibility in pipe alignment and reduces the stress on bolts, making it ideal for low-pressure and non-critical applications.

Stub End
Key Features:
  • 1. Used with a lap joint flange to allow easy pipeline dismantling.
  • 2. Helps in pipeline alignment adjustments and reduces flange bolt stress.
  • 3. Available in different materials, including stainless steel, carbon steel, and alloy steel.
  • 4. Lap-Joint Stub End is ideal for low-pressure and non-critical applications.
  • 5. Manufactured in different lengths (short & long pattern) as per ASME B16.9.

Dimensions & Specifications Table (ASME B16.9 Standard):

Nominal Pipe Size (NPS) Outside Diameter (OD) Stub End Length (Long Pattern) Stub End Length (Short Pattern) Lap Diameter
1/2" 21.3 mm 57 mm 32 mm 34 mm
3/4" 26.7 mm 59 mm 35 mm 42 mm
1" 33.4 mm 64 mm 38 mm 51 mm
1 1/2" 48.3 mm 76 mm 44 mm 73 mm
2" 60.3 mm 89 mm 51 mm 92 mm
3" 88.9 mm 108 mm 64 mm 127 mm
4" 114.3 mm 140 mm 76 mm 157 mm
6" 168.3 mm 178 mm 89 mm 219 mm
8" 219.1 mm 203 mm 102 mm 273 mm

Nipple (Swage Nipple & Pipe Nipple)

A nipple is a short piece of pipe with male threads on both ends, used to connect two fittings or extend a pipeline. It comes in different types, including Swage Nipple and Pipe Nipple, depending on specific use cases.

Swage Nipple is used for reducing pipe diameters, typically in high-pressure applications, while Pipe Nipple is a straight pipe connector used in low to medium-pressure systems.

Nipple
Subtypes:
  • 1. Swage Nipple: Used to connect pipes of different diameters, mainly in high-pressure piping systems.
  • 2. Pipe Nipple: A straight pipe piece with threads on both ends, commonly used for extending pipe connections.

Dimensions & Specifications Table (ASME B16.11 Standard):

Nominal Pipe Size (NPS) Pipe Nipple Length Swage Nipple Large End Swage Nipple Small End Thread Type
1/2" 50 mm - 150 mm 21.3 mm 15 mm NPT / BSP
3/4" 60 mm - 200 mm 26.7 mm 21.3 mm NPT / BSP
1" 75 mm - 250 mm 33.4 mm 26.7 mm NPT / BSP
1 1/2" 100 mm - 300 mm 48.3 mm 33.4 mm NPT / BSP
2" 125 mm - 400 mm 60.3 mm 48.3 mm NPT / BSP
3" 150 mm - 500 mm 88.9 mm 60.3 mm NPT / BSP
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