Non-Metallic Flat Gasket Dimensions 4"" — ASME B16.21
Non-Metallic Flat Gasket Dimensions 4"" to ASME B16.21: id — inside dia 114 mm, od — class 150 175 mm, od — class 300 181 mm, od — class 600 194 mm.
Dimensions of Non-Metallic Flat Gasket Dimensions 4""
| Symbol | Dimension | Value |
|---|---|---|
| · | ID — Inside dia | 114 mm (4.488 in) |
| · | OD — Class 150 | 175 mm (6.890 in) |
| · | OD — Class 300 | 181 mm (7.126 in) |
| · | OD — Class 600 | 194 mm (7.638 in) |
SKU TSH-GASKET-ASME-B16-21-4" · Standard ASME B16.21 · teshi-web
Purchase description
NON-METALLIC FLAT GASKET DIMENSIONS, 4"", SS316 + GRAPHITE, CS RINGS, ASME B16.21
Available materials: SS316 + graphite, CS rings, SS316 + PTFE, CNAF (non-asbestos), Neoprene / EPDM rubber, Soft iron / SS316 (ring joint).
Notes
- Dimensions are in millimetres unless stated otherwise.
- Values are rounded to the nearest millimetre; some published tables differ by 1 mm.
Other sizes — Non-Metallic Flat Gasket Dimensions, Standard
½""¾""1""1¼""1½""2""2½""3""3½""5""6""8""10""12""14""16""18""20""24""
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.