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Sweldolet Flange

SweD-Olet flange : Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

Trusted Source for SweD-Olet Flanges in Carbon, Stainless, Alloy & High-Nickel Steel — ½″–24″, 150#–2500# Pressure Classes, Ideal for High-Pressure Pipelines in Oil, Gas, and Petrochemical Industries.

SweD-Olet flange Supplier

Best Export Prices: sales@midlandforgefittings.com

At Midland Forge and Fittings Pvt. Ltd., we manufacture high-quality SweD-Olet flanges designed for secure and leak-free branch connections in industrial piping systems. Available in carbon steel, stainless steel, alloy steel, and high-nickel steel.

our SweD-Olets are engineered to meet ASME B16.9 standards, ensuring precise dimensions, proper stress distribution, and exceptional durability under high-pressure and high-temperature conditions. These fittings are ideal for oil & gas, petrochemical, power generation, and chemical process industries.

Our SweD-Olet flanges are available in sizes ranging from ½″ to 24″ and pressure classes from 150# to 2500#, making them versatile for a wide range of industrial applications. Each product undergoes strict quality control, dimensional verification, and NDT inspections to guarantee leak-proof, long-lasting performance. With us you get reliable, ASME-compliant SweD-Olet flanges ready for domestic and international projects, delivering both precision and peace of mind to your piping systems.

A Sweldolet flange is a butt-weld branch outlet fitting that connects a smaller branch pipe to a main run line. It features a hub for welding and a flanged end for secure connections, ensuring leak-proof and stress-free piping junctions. SweD-Olets are available in carbon steel, stainless steel, alloy steel, and high-nickel alloys. They are manufactured according to ASME B16.9 / B16.11 standards for precise dimensions and pressure ratings.

SweD-Olet flanges are used to reduce stress concentration, prevent leaks, and ensure structural integrity at branch connections. Their compact hub design distributes stress evenly, making them suitable for high-pressure and high-temperature applications.

ASME B16.9

Sweldolet Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

SweD-Olet

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.9, ANSI B16.11, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.11, MSS SP - 97

Sweldolet Flange – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Carbon Steel ASTM A105 (Forged CS), ASTM A350 LF2 (Low Temp CS) Class 150 – 2500, Size ½”–24” Oil & gas, general industrial piping, pressure lines
Stainless Steel ASTM A182 F304 / F304L / F316 / F316L Class 150 – 2500, Size ½”–24” Corrosive and high-temperature applications, chemical, marine, and pharmaceutical industries
Alloy Steel ASTM A182 F11 / F22 / F91 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines, high-temperature applications
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high-corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718, Monel 400 / K500 Class 150 – 2500, Size ½”–24” Chemical, heat exchangers, marine, aerospace, seawater handling
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, seawater systems, desalination plants
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.9 SweD-Olet Flange– Dimensions

Dimensions of ANSI/ASME B16.9 SweD-Olet Flange
Branch NPS O.D. of Hub (mm) Hub Height / Length Thru Hub (mm) Flange Thickness (mm) Bolt Circle Dia (mm) Bolt Hole Dia (mm)
½″ 21.3 25 12 85 18
¾″ 26.7 30 14 95 18
1″ 33.4 35 16 105 18
1¼″ 42.2 40 18 115 18
1½″ 48.3 45 20 125 18
2″ 60.3 50 22 140 18
2½″ 73 55 24 155 18
3″ 88.9 60 26 170 18
4″ 114.3 70 30 200 22
6″ 168.3 85 34 240 22
8″ 219.1 100 38 295 26
10″ 273 120 42 350 26
12″ 323.9 140 46 400 30
14″ 355.6 160 50 450 30
16″ 406.4 180 54 500 33
18″ 457.2 200 58 550 36
20″ 508 220 62 600 36
24″ 609.6 250 70 700 39

Sweldolet Flange Weight Chart

Schedule 1/2″ 3/4″ 1″ 1 1/4″ 1 1/2″ 2″ 2 1/2″ 3″ 3 1/2″ 4″ 5″ 6″ 8″ 10″ 12″
STD 0.09 0.14 0.21 0.41 0.50 0.79 1.81 1.86 2.54 2.90 10.43 16.78 20.87 27.67 31.75
XS 0.11 0.32 0.38 0.57 0.79 0.97 1.53 2.87 4.76 6.46 12.70 20.41 38.56 27.67 31.75
160 0.11 0.32 0.38 0.57 0.79 0.97 1.53 2.87 4.76 6.46 12.70 20.41 38.56 27.67 31.75
XXS 0.11 0.32 0.38 0.57 0.79 0.97 1.53 2.87 4.76 6.46 12.70 20.41 38.56 – –

Sweldo Olet flange Tolerances as per ANSI / ASME B16.9,16.11

Nominal Pipe Size (NPS) Outside Diameter Tolerance (D) Inside Diameter Tolerance Center-to-End / Wall Thickness (t) Alignment (U) Applicable Standard
1/2″ – 2 1/2″ +1.6 mm / -0.8 mm 0.8 mm ≥ 87.5% of nominal ±1 mm per 200 mm ASME B16.9 / B16.11
3″ – 3 1/2″ ±1.6 mm 1.6 mm ≥ 87.5% of nominal ±1 mm per 200 mm ASME B16.9 / B16.11
4″ ±1.6 mm 1.6 mm ≥ 87.5% of nominal ±1 mm per 200 mm ASME B16.9 / B16.11
5″ – 8″ +2.4 mm / -1.6 mm 1.6 mm ≥ 87.5% of nominal ±1 mm per 200 mm ASME B16.9 / B16.11
10″ – 18″ +4.0 mm / -3.2 mm 3.2 mm ≥ 87.5% of nominal ±2 mm per 200 mm ASME B16.9 / B16.11
20″ – 24″ +6.4 mm / -4.8 mm 4.8 mm ≥ 87.5% of nominal ±2 mm per 200 mm ASME B16.9 / B16.11
26″ – 30″ +6.4 mm / -4.8 mm 4.8 mm ≥ 87.5% of nominal ±2 mm per 200 mm ASME B16.9 / B16.11
32″ – 48″ +6.4 mm / -4.8 mm 4.8 mm ≥ 87.5% of nominal ±2 mm per 200 mm ASME B16.9 / B16.11
What are the critical design considerations when selecting a Sweldolet for a high-pressure system?
  • Pipe Schedule and Wall Thickness:
    • Sweldolet fittings must match the run pipe’s schedule to maintain structural integrity.
    • The wall thickness of the Sweldolet is generally equal to or slightly greater than that of the branch pipe to prevent stress concentration at the junction.
  • Branch-to-Run Pipe Diameter Ratio:
    • ASME B16.9 specifies limits for branch pipe sizes relative to run pipe diameter.
    • Exceeding these ratios can increase stress on the run pipe and compromise the weld.
  • Pressure Rating Alignment:
    • The Sweldolet pressure rating must be equal to or greater than the system pressure.
    • Class ratings (3000, 6000, 9000) determine allowable stress for high-pressure applications.
  • Material Compatibility:
    • The Sweldolet material must match or exceed the mechanical and corrosion resistance of the main pipe and branch pipe.
    • Common materials: ASTM A105 (carbon steel), A182 F316/F304 (stainless steel), and alloy steels (F11/F22).
  • Stress Analysis:
    • FEA (Finite Element Analysis) is recommended for large-diameter branches to predict stress distribution and deformation.
Feature Sweldolet Sockolet Threadolet
Connection Type Butt-weld Socket-weld Threaded
Pressure Rating High (up to Class 9000) Medium Low to Medium
Installation Space Compact Compact Very compact
Stress Handling Excellent Moderate Limited
Use Case High-pressure, high-temperature pipelines Medium pressure lines Low-pressure or temporary connections
  1. Branch-to-Run Ratio:
    • The maximum branch diameter is generally 50% of the main run pipe diameter.
    • Exceeding this increases local stresses and may require reinforcement or use of a reducing Sweldolet.
  2. Stress Distribution:
    • Sweldolet hub design ensures gradual transfer of stresses from branch to run pipe.
    • Proper fillet weld size and wall thickness minimize stress concentration factors (SCF).
  3. Flow Considerations:
    • For large branches, consider flow turbulence at the junction.
    • Smooth transitions reduce erosion and pressure drop in high-velocity systems.
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