Currently common practice is to have HP steam at 31 bar g and 390°C. As the trend towards the generation of electrical power for export outside the factory continues so the steam conditions will increase. But this spec is for 31 bar g and 390°C.
| Size Range | Specification |
| Pipe | |
|---|---|
| 15-300 | ASTM A106 Gr B Schedule 40 |
| Fittings | |
| 15-40 | BS3799 3000lb - Material ASTM A105 |
| 50-300 | BS1640 Pt 3.1 - Material ASTM A234 Gr WPB - standard weight |
| Flanges | |
| 50-300 | BS1560 Pt3; CLASS 300; code 101 plate flange for welding; type B raised face- Material BS1051-151 Gr 360 |
| Gaskets | |
| 50-300 | BS1832 Inside Bolt Circle (IBC) for type B raised face flange facings; 1.5mm thick compressed asbestos fibre (CAF) CLASS 300 |
| Bolting | |
| ***** | |
| Valves | |
| 15-50 | Ball valve; carbon steel body; full bore; three piece; 316 stainless steel ball; PTFE seat; socket weld ends; to BS5159 PN40 |
| 80-300 | **** |
| 15-40 | Check valve; carbon steel body; piston type; socket weld ends to BS5160 PN40 |
| 50-300 | Check valve; carbon steel body; dual carbon steel discs; face to face dimension as per BS5155, PN40; to fit between flanges to BS4504 PN40 |