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Engineering review remains the gate before any specific recommendation. The page will appear in a moment.
Product category
Pipe Fittings & Flanges
Industrial flanges configured to project requirements, with supporting pipe fittings and connection components quoted alongside flange scope where required.
Overview
Flanges supplied against confirmed specification
FLOWTEC (UK) supplies industrial flanges configured to project requirements. Flanges may be offered against recognised standards where supported by order scope and source data.
Materials, pressure class, facing, drilling and documentation are confirmed at quotation and order stage. Every enquiry is subject to engineering review before recommendation, quotation or documentation release.
Standards
Standards worked against
Design-basis references only — not a statement of certification. The governing standard, edition and scope are confirmed against the project specification at quotation.
- ASME B16.5Pipe flanges NPS ½ – 24, Class 150 – 2500 — core dimensional reference
- ASME B16.47 Series A & BLarge-diameter flanges NPS 26 – 60; Series A and B are not interchangeable
- ASME B16.36Orifice flanges with pressure tappings, Class 300 – 2500
- EN 1092-1European metric flanges — Types 11, 12, 05 and 01
- BS 3293Carbon-steel petroleum-industry flanges NPS 26 – 48
- MSS SP-44Steel pipeline flanges — aligned to ASME B16.47 Series A
- AWWA C207Waterworks steel flanges
- SANS 1123South African flange tables
- JIS B2220Japanese industrial flange reference
- GOST 12820 / 12821Regional and project-specified reference
- BS 10 / DIN seriesLegacy references — current projects specify EN 1092-1 where applicable
Range
Flange types
Each type is shown in capability framing with standard-specific naming. Full technical data is issued on request after engineering review.
- Weld neck flangesASME WNRF / RTJ · EN 1092-1 Type 11Tapered hub transfers stress gradually into the pipe — higher-pressure, higher-temperature and cyclic duties.
- Slip-on flangesASME SORF · EN 1092-1 Type 12 (hubbed)Pipe passes into the bore and is secured by two fillet welds — simpler fit-up for moderate-pressure duties.
- Blind flangesASME BLRF / RTJ · EN 1092-1 Type 05Solid closure for line terminations, vessel and equipment openings and future tie-in points.
- Socket weld flangesASME SWRFInternal counterbore with a single external fillet weld — small-bore, higher-pressure piping.
- Threaded flangesASME THRFTapered internal thread, no welding — utility duty and welding-restricted locations.
- Plate flangesEN 1092-1 Type 01 (PN designations)Flat plate flange for EN / PN metric pipework — water utility and building-services duty.
- Lap joint flangesASME Lap Joint (with stub end)Loose backing flange used with a stub end — frequent dismantling and alloy pipework.
- Steel flanges — overviewGeneral range summaryCarbon and stainless steel flange ranges available against confirmed specification.
Long welding-neck, reducing, orifice flanges and stub ends are also addressed within the catalogue scope — request technical data for these configurations.
Ratings
Pressure class and PN orientation
ASME flanges are designated by pressure class (Class 150, 300, 400, 600, 900, 1500 and 2500); EN 1092-1 flanges by PN designation. Class and PN are designation systems rather than interchangeable equivalents — the allowable pressure of any flange depends on material group and service temperature under the governing standard.
The catalogue range addresses ASME Class 150 – 2500 in NPS ½″ – 24″ (DN 15 – 600), large-diameter Class 75 – 900 to ASME B16.47 in NPS 26″ – 60″, and EN / PN metric ranges by flange type. Ratings for a specific duty are confirmed at quotation stage.
Materials
Material grades
Carbon steel (e.g. ASTM A105), low-temperature carbon steel (A350 LF2), stainless steel (A182 F304 / F316 / F316L) and alloy grades (e.g. A182 F11 / F22) are addressed against confirmed project specification.
Material grade, testing and any certification requirements are confirmed at quotation and order stage.
Configuration
Facing and drilling
Raised face (RF) is the common facing for general industrial duty. Flat face (FF) suits cast-iron and glass-lined counter-flanges. Ring-type joint (RTJ) facings serve higher-pressure, higher-temperature duties on weld-neck and blind types where the governing standard provides for them.
Drilling templates follow the governing standard. State the facing, finish and drilling requirement at enquiry.
Documentation
Certificates and catalogue data
Material Test Certificates and order-specific documentation can be supplied where specified in the purchase order and confirmed at quotation stage.
EN 10204 3.1-type material certification may be supplied where applicable and agreed within the order scope.
Detailed dimensional tables and catalogue data are available on request for project review.
Enquiry
Flange enquiry checklist
Including these details with your enquiry allows engineering review to proceed without a clarification round.
- 01Nominal size (NPS or DN) and quantity per size
- 02Governing standard and edition (e.g. ASME B16.5, EN 1092-1)
- 03Pressure class or PN designation
- 04Flange type (weld neck, slip-on, blind, socket weld, threaded, plate, lap joint)
- 05Facing (RF, FF or RTJ) and any special finish requirement
- 06Material grade (e.g. A105, A182 F304 / F316, A350 LF2)
- 07Service, fluid and operating temperature
- 08Documentation requirements (MTC and inspection scope)
Next step
Requesting technical data
Send your enquiry with the checklist details above via the contact page, or use the request action on any flange type page. Engineering review precedes every recommendation, quotation or documentation release. No catalogue or dimensional documentation is published for public download.
Specifying flanges or pipe fittings?
Tell us your size, standard, class, material and facing and our engineering team will respond with a proposed configuration.