6 Products in this range
A flanged joint only works when three things agree: the flange face, the gasket and the bolt load. We manufacture the flanges and the rings, and supply the gaskets cut to the same standard, so a joint sourced from us has no mismatch designed into it.
The range includes the specials that refinery and metering work depends on — orifice flanges with tapped pressure connections, bleed rings for draining and venting a line, and spectacle blinds that give a visible, positive isolation.
Six product families covering standard, special and sealing requirements.
01
Supplied as a pair with radially drilled and tapped pressure connections either side of the orifice plate, so differential pressure can be read straight off the joint. Jack screws are provided to spread the flanges when the plate is changed without breaking the whole spool apart.
02
The full standard family — weld neck, slip-on, blind, socket weld, threaded, lap joint, long weld neck and reducing flanges. Forged from traceable material, machined on CNC, and face-finished to the serration your gasket specification asks for.
03
Compact four-bolt SAE flange connections for high-pressure hydraulic circuits, where an O-ring in a machined groove does the sealing rather than a gasket. Far more tolerant of vibration and pressure pulsation than a threaded connection.
04
A drilled and tapped ring inserted between two flanges, giving a permanent point to drain, vent, sample or prove that a line is depressurised before a blind is swung. Also called a drip ring or monitoring ring.
05
A figure-of-eight plate with one solid disc and one open ring, joined by a web. Swinging it over gives a positive isolation that can be confirmed from the walkway with a glance — no instrument and no doubt. Also supplied as separate paddle spades and spacer rings.
06
Spiral wound with inner and outer rings, ring type joint in oval and octagonal profiles, metal jacketed, corrugated, camprofile and soft cut gaskets. Filler and winding materials are chosen against the actual media, temperature and flange facing rather than a generic default.
Forged flange grades and the plate grades used for blinds, spades and spacers.
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| Material Group | Forged Flanges | Plate (Blinds & Spacers) | Typical Service |
|---|---|---|---|
| Carbon Steel | ASTM A105, A105N | ASTM A516 Gr. 60 / 70 | General process & utility |
| Low Temperature CS | ASTM A350 LF2, LF3 | ASTM A516 Gr. 70 (impact tested) | Cryogenic, cold climate |
| Alloy Steel | ASTM A182 F5, F9, F11, F22, F91 | ASTM A387 Gr. 11, 22, 91 | High temperature steam |
| Stainless Steel | ASTM A182 F304 / F304L / F316 / F316L | ASTM A240 304 / 316 | Corrosive & hygienic |
| Stabilised Stainless | ASTM A182 F321, F347 | ASTM A240 321 / 347 | High temperature corrosive |
| Duplex & Super Duplex | ASTM A182 F51, F53, F55 | ASTM A240 S31803 / S32750 | Chloride, seawater |
| Nickel Alloys | Inconel 600 / 625, Monel 400, Hastelloy C276 | Corresponding plate grades | Severe corrosion |
Equivalent EN, DIN, BS and JIS designations are supplied on request.
Typical composition of the principal flange grades, percent by weight.
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| Grade | C | Mn | Si | P max | S max | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| A105 | 0.35 max | 0.60–1.05 | 0.10–0.35 | 0.035 | 0.040 | 0.30 max | 0.40 max | 0.12 max |
| A350 LF2 | 0.30 max | 0.60–1.35 | 0.15–0.30 | 0.035 | 0.040 | 0.30 max | 0.40 max | 0.12 max |
| A182 F11 | 0.05–0.15 | 0.30–0.60 | 0.50–1.00 | 0.030 | 0.030 | 1.00–1.50 | — | 0.44–0.65 |
| A182 F22 | 0.05–0.15 | 0.30–0.60 | 0.50 max | 0.040 | 0.040 | 2.00–2.50 | — | 0.87–1.13 |
| A182 F304 | 0.08 max | 2.00 max | 1.00 max | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | — |
| A182 F316 | 0.08 max | 2.00 max | 1.00 max | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 |
| A182 F51 (Duplex) | 0.030 max | 2.00 max | 1.00 max | 0.030 | 0.020 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 |
Composition is verified by PMI on our own equipment; the heat analysis appears on the mill certificate.
Minimum room-temperature values to the governing specification.
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| Grade | Tensile Strength (MPa, min) | Yield Strength (MPa, min) | Elongation (%, min) | Hardness (HB, max) |
|---|---|---|---|---|
| A105 | 485 | 250 | 30 | 187 |
| A350 LF2 | 485 | 250 | 30 | 197 |
| A182 F11 Cl.2 | 485 | 275 | 20 | 174 |
| A182 F22 Cl.3 | 515 | 310 | 20 | 190 |
| A182 F304 | 515 | 205 | 30 | 192 |
| A182 F316 | 515 | 205 | 30 | 192 |
| A182 F51 | 620 | 450 | 25 | 293 |
| A516 Gr. 70 | 485–620 | 260 | 21 | — |
Charpy impact testing at the specified design temperature is carried out on low temperature grades.
Maximum non-shock working pressure for Group 1.1 material to ASME B16.5.
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| Class | At 38 °C (bar) | At 200 °C (bar) | At 400 °C (bar) | Common Facings |
|---|---|---|---|---|
| 150 | 19.6 | 13.8 | 9.3 | RF, FF |
| 300 | 51.1 | 41.9 | 34.5 | RF, RTJ |
| 600 | 102.1 | 83.9 | 69.0 | RF, RTJ |
| 900 | 153.2 | 125.8 | 103.4 | RTJ |
| 1500 | 255.3 | 209.7 | 172.4 | RTJ |
| 2500 | 425.5 | 349.5 | 287.3 | RTJ |
Values are indicative. The applicable rating always follows the material group and design temperature of your specification.
Where these flanges, rings and gaskets go into service.
We will confirm sizes, classes, facings and materials, and quote the complete joint — flange, ring and gasket together.
