STYLE 2235 TOP OF THE RANGE VALVE PACKING
Description and Application
The new TEADIT packing Style 2235 is made from layers of flexible graphite tape plied into compact strands; each individual filament is reinforced with an Inconel* wire jacket. This yarn is then square braided to form a dense yet malleable packing, which is subsequently treated with lubricating agents to reduce stem friction and a corrosion inhibitor to prevent pitting (* Inconel is a registered trademark of International Co.). Teadit style 2235 is a high-performance valve packing, especially designed for high-pressure, high-temperature steam service. It is self-lubricating, non-hardening, dimensionally stable and easy to install. The Inconel wire mesh covering makes this packing highly resistant to extrusion, the advanced construction assures superior leakage control and highest integrity in steam service.
Typical applications for Style 2235 include control and block valves, as well as other demanding applications in power plants, refineries and similar industries where high pressures and high temperatures are prevailing. It is designed for steam applications, Teadit Style 2235 can also be used with most chemicals and gases.
It is not suitable for highly oxidizing agents at high temperature.
High mechanical and thermal stability; chemically inert within pH range 0 - 14; quick and easy to install; suitable for rotary and rising-stem valves; low friction, special lubricating system; corrosion inhibitor.
Please note: the colour of the actual product might vary from the above image on this data-sheet.
Service Limits
| Temperature (ºC) | |
|---|---|
| Minimum | -240 |
| Maximum | 450 |
| Steam | 650 |
| Pressure (bar) | |
|---|---|
| Static | 450 |
| pH | |
|---|---|
| Minimum | 0 |
| Maximum | 14 |
International Approvals for Style 2235
Tests were conducted by Yarmouth Research and Technology Maine – USA
Fire Test
Objective
Qualify packing Style 2235 for fire resistance when used in valves subjected to direct flame.
Test Procedure
API STANDARD 589 – SECOND EDITION
Conclusion
Packing 2235 has successfully passed this test exceeding the requirements of the standard.
| Parameters | Leaks(ml/min) | |
|---|---|---|
| Measured | Allowable | |
| During the 2 minutes pretest hydrostatic | 0.0 | 0 |
| During firing and cooling | 0.1 | 60 |
| During the low pressure test after firing | 1.6 | 3 |
| After the closing and opening operation | 13.2 | 60 |
Fugitive Emissions Test
Objective
Qualify packing style 2235 for fugitive emissions in valves when subjected to thermal and mechanical cycles. Leak detection method "EPA method 21".
Test Parameters
5000 mechanical cycles, with a maximum of 3 adjustments. 10 thermal cycles at room temperature and up to 260°C. Leak measurements performed before and after each thermal cycle and every 100 cycles of the stem. Test pressure: 600 psi (42 kgf / cm2).
Conclusion
Packing 2235 has successfully passed the test with one single adjustment during the 5,000 cycles while maintaining maximum leakage under 500 PPMv, as the graph on the right shows.
