Class 300 orifice flange (mm) 4"" — ASME B16.36
Class 300 orifice flange (mm) 4"" to ASME B16.36: o — outside dia 255 mm, t — min thickness 36.6 mm, r — raised face dia 157.2 mm, x — hub dia 146 mm, y — length thru hub 90 mm.
Dimensions of Class 300 orifice flange (mm) 4""
| Symbol | Dimension | Value |
|---|---|---|
| · | O — Outside dia | 255 mm (10.039 in) |
| · | T — Min thickness | 36.6 mm (1.441 in) |
| · | R — Raised face dia | 157.2 mm (6.189 in) |
| · | X — Hub dia | 146 mm (5.748 in) |
| · | Y — Length thru hub | 90 mm (3.543 in) |
| · | W — Bolt circle | 200 mm (7.874 in) |
| · | Holes — No. | 8 |
| · | Hole dia — mm | 22.2 mm (0.874 in) |
| · | Bolt — in | ¾" in |
| · | Stud — Length, mm | 135 mm (5.315 in) |
SKU TSH-FLANGE-ASME-B16-36-4" · Standard ASME B16.36 · teshi-web
Purchase description
CLASS 300 ORIFICE FLANGE (MM), 4"", ASTM A105N, ASME B16.36
Available materials: ASTM A105N, ASTM A350 LF2 Cl 1, ASTM A182 F304/304L, ASTM A182 F316/316L, ASTM A182 F11 Cl 2, ASTM A182 F22 Cl 3, ASTM A182 F51 (Duplex), ASTM A182 F53 (Super Duplex), ASTM A694 F52 / F60, IS 2062 E250 (plate).
Notes
- Dimensions are in millimetres unless stated otherwise. Bolt holes and bolt diameters follow ASME B16.5 (inch); the mm values are conversions.
- The bore is machined to the pipe inside diameter specified by the purchaser.
- Each flange has two pressure taps, usually ½" NPT, on opposite sides; other tap sizes and orientations are supplied on request.
- One jack screw per flange, set 180° apart, is used to separate the flanges to change the orifice plate.
- Raised face height is 2 mm for Class 300; for Class 600 it is 2 mm at NPS 1–3 and 7 mm at NPS 4–24.
- Stud lengths include an allowance of about 6 mm for the orifice plate and gaskets (NPS 1–12).
- Class 600 orifice flanges from NPS 1 to 3 have the same dimensions as Class 300.
Other sizes — Class 300 orifice flange (mm), Standard
Frequently asked questions
What are the main types of pipe flanges?
Weld neck (WN), slip-on (SO), blind (BL), socket weld (SW), threaded (THD), lap joint (LJ) and plate flanges. Special types include orifice, long weld neck, reducing flanges and spectacle blinds.
When should I use a weld neck flange instead of a slip-on?
Use weld neck flanges for high pressure, high or cycling temperature, and lines with vibration or fatigue loading. The tapered hub and full-penetration butt weld spread stress smoothly. Slip-on flanges are cheaper and easier to align, but their fatigue life is roughly one third of a WN.
What does Class 150, 300 or 600 mean on a flange?
The ASME class is a pressure-rating designation, not a pressure in psi. The allowable pressure depends on the material group and temperature. A Class 150 A105 flange is rated 19.6 bar at 38 °C but 13.8 bar at 200 °C.
Is a 150# flange rated for 150 psi?
No. A Class 150 carbon-steel flange is rated about 285 psi (19.6 bar) at ambient temperature, and about 170 psi (11.7 bar) at 260 °C. The "150" is a class number.