Nik-San Pipefit Engineering Co.

Carbon steel butt weld fittings are integral components in piping systems, used to create strong, seamless connections between pipes. Here’s a detailed overview:

• Definition: Butt weld fittings are designed to be welded directly to the ends of pipes, allowing for smooth transitions and branch connections in a piping system.
• Material: Made from carbon steel, which offers good mechanical properties and is cost-effective for many applications.

• Elbows: Used to change flow direction. Common angles include 90°, 45°, and 180° (return bends).
  • Long Radius (LR): Center-to-end dimension is  nominal pipe size (NPS); offers smoother flow.
  • Short Radius (SR): Center-to-end dimension is  NPS; used in tight spaces.
• Tees: Create a 90° branch from the main line.
  • Equal Tee: All three outlets have the same diameter.
  • Reducing Tee: The branch diameter is smaller than the main pipe.
• Reducers: Connect pipes of different diameters.
  • Concentric: Both ends share the same centerline; ideal for vertical lines.
  • Eccentric: Offset centerline; used in horizontal lines to prevent air pockets or debris buildup.
• Caps: Seal the end of a pipeline.
• Stub Ends: Used in conjunction with lap joint flanges to allow easy disassembly for maintenance.

• Butt-weld (BW) caps These are welded directly onto the end of the pipe to create a permanent, leak-proof seal. Butt-weld caps are available in seamless and welded forms.
  • Common specifications: ASTM A234 WPB and ASTM A420 WPL6 for low-temperature applications.
• Threaded caps Also known as female threaded caps, these have internal threads and are screwed onto a pipe with male threads.
  • Common specification: ASME B16.11 for forged fittings.

• • Long Radius (LR): The centerline radius is 1.5 times the nominal pipe size (NPS). These are the most common type and offer less frictional resistance to flow.
  • Short Radius (SR): Used in tight spaces where room is limited; the radius is typically equal to the NPS (1D).
• Size Range: Standard sizes range from 1/2" NPS to 48" NPS, with some manufacturers offering up to 72".
• Wall Thickness (Schedules): Available in various schedules to match different pressure requirements, including Sch 10, Sch 40 (Standard), Sch 80 (Extra Strong), Sch 160, and XXS.
• End Connections: Primarily Butt Weld (BW) ends, though some variants may feature threaded or socket-weld connections for specific applications. 

• Dimensions: The center-to-end distance for a standard LR elbow is calculated as . For example, a 4-inch pipe using a long radius 90° elbow has a 6-inch takeoff.
• Common Standards: Most industrial fittings comply with ASME B16.9 for factory-made wrought buttwelding fittings, but they may also meet ASTM A234 (carbon steel), ASTM A403 (stainless steel), or ASME B16.22 (copper).
• Pressure Ratings: Available in various schedules ranging from Schedule 5S to XXS, with Schedule 40 and Schedule 80 being common for medium to high-pressure applications.

A pipe fitting is defined as a part used in a piping system, for changing direction, branching or for change of pipe diameter, and which is mechanically joined to the system. There are many different types of fittings and they are the same in all sizes and schedules as the pipe

A mild steel butt weld end cap is a fitting used to close the end of a pipe in a piping system. Here’s an overview of its features, advantages, applications, and installation process:

• Definition: A butt weld end cap is designed to cover the end of a pipe by welding it directly to the pipe's end, providing a secure and permanent closure.
• Material: Made from mild steel, which is a type of carbon steel with low carbon content, offering good weldability and strength.

Nik-San Pipefit Engineering Co. is a known manufacturer and trader of CS Butt Weld Pipe Fittings, which is available in different shapes, designs and sizes to our clients. We also offer these fittings in different grades and specifications such as ASTM A234 Carbon Steel Butt Weld Pipe Fittings, ASTM A105 Carbon Steel Butt Weld Fittings, and ASTM A106 Gr. B Carbon Steel Pipe Fittings. These Carbon Steel Cross Butt Weld Pipe Fittings cannot be hardened by heat treatment, which further can however be work hardened. Solution treatment or annealing of our Carbon Steel Reducer Butt Weld Pipe Fittings can be carried out by rapid cooling after heating to around 1100 Degree C. These Carbon Steel Bend Pipe Fittings have good weldability, where all standard welding processes can be used. Our Carbon Steel Stub End Butt Weld Pipe Fittings are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding. Nik-San Pipefit Engineering Co. is one of the well – known distributor and exporter of these Carbon Steel End Cap Butt Weld Pipe Fittings, which is the most widely used (ferrite / austenitic) steel grade.

Specifications: ASTM / ASME A234, A420, A860, A403

Dimensions: ASME/ANSI B16.9, ASME B16.28, MSS-SP-43

Size: Seamless Elbow ( 1/2″～24″), ERW / Welded / Fabricated Elbow (1/2″～48″)

Type: Seamless / ERW / Welded / Fabricated

Thickness: Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc.

Form: 30° LR

Carbon Steel: A234 WPB, A420 WPL6, A860 WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65, WPHY 70.

Stainless Steel: A403 304, 304L, 310, 316, 316L, 317, 317L.

Stainless Steel ASME B16.9 Buttweld 90° Long Radius Elbow | Carbon Steel ASME B16.9 Buttweld 90° Long Radius Elbow | Nickel Alloys ASME B16.9 Buttweld 90° Long Radius Elbow

Sizes: 1/2” TO 36” (SEAMLESS UPTO 24”) (WELDED 8” TO 36” )
Standards: ASME / ANSI - B 16.9
ASTM A403 - ASME SA403 - 'Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings'
API 590-605
ASME B16.9 - 'Factory-Made Wrought Buttwelding Fittings'
ASME B16.25 - 'Buttwelding Ends'
ASME B16.28 - 'Wrought Steel Buttwelding Short Radius Elbows and Returns'
MSS SP-43 - 'Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications'
Schedule: Sch 5 TO Sch XXS.
Thickness: Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc.
Type: Buttweld (BW)

Material and Grades:

Carbon Steel:
ASTM A234 Gr. WPB
ASTM A420 Gr. WPL6
ASTM A105
ASTM A350 Gr. LF2
Stainless Steel:
ASTM A403 WP316/316L
ASTM A403 WP304/304L
ASTM A182 F316L, 304L