Slip On flange manufacturer in USA

Slip On the Flange manufacturer in USA

SVR Global provides a slip on flanges range designed to meet pipeline connections, valve endings, and equipment fastenings in process piping lines in the USA. All slip on flanges are machined from certified forged billets and manufactured according to ASME B16.5, ASME B16.47, MSS SP-44, and ANSI dimensional requirements providing accurate bore alignment, face flatness, and performance in carbon steel, alloy steel, and stainless steel materials.

What is a Slip On Flange?

Slip-on flange, also known as SO flange, is a bored flange that has an inner diameter somewhat bigger than the outside diameter of the joining pipe, which allows the pipe to slip in before carrying out the double fillet welds on the hub and face. This makes installation much easier and quicker especially when dealing with straight piping runs, branches, and equipment nozzles.

Key Design Characteristics

Bore diameter oversized relative to pipe OD for slip-fit assembly
Double fillet weld joint one weld at the flange face, one at the hub back
Lower initial material cost compared to weld neck flanges of the same rating
Suitable for low to moderate pressure and cyclic load piping systems
Available in forged and machined configurations per ASME B16.5 up to NPS 24 and MSS SP-44 for larger diameters

Core Functions of Slip On the Flange:

Pipe to pipe connection: Used to create a bolted and gasketed joint between two pipe spools, enabling disconnection and inspection, cleaning, or changing out of pipe sections without pipe cutting.
Pipe to equipment connection: Used to terminate piping runs to pumps, vessels, tanks, and skid-mounted equipment nozzles, using the same counter-flanged drilling and facing of the equipment.
Valve termination: Connects flanged end valves into the pipeline, allowing isolation and maintenance of the valve without disturbing adjacent pipe.
Load transfer at the weld joint: Transfers axial, bending, and torsional loads from the pipe wall into the flange body through the double fillet weld at the hub and face.
Sealing interface: The machined face (raised face, flat face, or ring groove for RTJ) provides the contact surface for a gasket, maintaining a pressure-tight seal under the applied bolt load.
Bolt load distribution: The bolt hole pattern and flange thickness distribute clamping force evenly around the joint circumference, preventing localized gasket leakage.
Alignment tolerance absorption: Because the bore is oversized relative to the pipe OD, the flange can accommodate minor pipe end squareness or diameter variation before welding, simplifying spool fabrication.
Line blind and spacer accommodation: Acts as the mating flange face when spectacle blinds, spacers, or line blinds are inserted for isolation during shutdowns or hydrotesting.

Materials and Grades Manufactured by SVR Global:

SVR Global forges and machines slip-on flanges in the following material types:

Carbon Steel: ASTM A105, A105N, A350 LF2, A350 LF3
Alloy Steel: ASTM A182 F5, F9, F11, F22, F91
Stainless Steel: ASTM A182 F304, F304L, F316, F316L, F316Ti, F321, F347
Duplex & Super Duplex Steel: ASTM A182 F51 (UNS S31803), F53 (UNS S32750), F55 (UNS S32760)
Nickel Alloys: Inconel 600/625, Monel 400, Hastelloy C276, Incoloy 800/825

Each material batch is traceable through mill test certificates (MTC) conforming to EN 10204 3.1, supporting chemical composition verification, mechanical property confirmation, and heat lot traceability.

Dimensional and Pressure Standards:

Standards Followed-

ASME B16.5 - Pipe Flanges and Flanged Fittings (NPS ½ to 24)
ASME B16.47 Series A & B - Large Diameter Steel Flanges (NPS 26 to 60)
MSS SP-44 - Steel Pipeline Flanges
ASME B16.36 - Orifice Flanges
DIN 2576, EN 1092-1 - for European bore and PN rating requirements
BS 10, JIS B2220 - for regional flange interface compatibility

Pressure Temperature Classes Available-

Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500

Facing Options-

Raised Face (RF)
Flat Face (FF)
Ring Type Joint (RTJ)
Lap Joint compatible bore configuration on request

Manufacturing Process at SVR Global:

Process Flow-

Raw Material Procurement - billets sourced with certified chemical and mechanical test reports
Forging - open die or closed die forging to near-net shape under controlled temperature to align grain flow
Heat Treatment - normalizing, annealing, or quenching and tempering depending on grade requirement
CNC Machining - precision boring, facing, and bolt hole drilling to ASME B16.5/B16.47 tolerances
Surface Finishing - serrated, smooth, or spiral finish on raised face per customer specification
Marking - heat number, grade, size, class, and manufacturer identification stamped per ASME B16.5 Annex requirements
Final Inspection & Packing - corrosion inhibitor coating, export grade wooden case or pallet packing

Quality Control and Testing:

SVR Global performs the following inspection and testing protocols on slip-on flanges before dispatch:

Chemical composition analysis (spectrometer testing)
Testing mechanical strength - Tensile strength, Yield strength, Elongation, Hardness test (Brinell/Rockwell)
Ultrasonic Testing (UT) according to ASTM A388 to detect internal discontinuity
Dye Penetrant Test (DPT)/Magnetic Particle Test (MPT) to detect surface defects
Positive Material Identification (PMI) for alloy and stainless steel grades
Dimensional inspection using CMM and bore gauges against ASME B16.5/B16.47 tolerances
Third-party inspection coordination TPI, Lloyd's Register, Bureau Veritas, SGS, or client nominated agency

Applications of Slip On Flanges:

Slip on flanges manufactured by SVR Global are used across piping systems that require moderate pressure ratings and straightforward field welding. Typical application areas include

Oil and gas gathering and transmission pipelines
Petrochemical process piping for hydrocarbon and chemical transfer lines
Power generation plants - boiler feed, condensate, and cooling water piping
Marine and offshore platform piping systems
Water and wastewater treatment plant piping
Pulp and paper processing lines
Structural and equipment mounting flanges for tanks, vessels, and skid packages

Slip On The Flange