The E Series Valves and Manifolds by AS-Schneider are available upon request with sealing made of graphite, so can be readily used up to 550°C.
The international standard EN 61518 / IEC 61518 describes the flange connection between the manifolds and the pressure transmitters. The temperature limits of these connections are as follows:
- 80°C for PTFE sealing.
- 120°C for graphite sealing.
The temperature limit of 120°C refers to the limits, which are applicable for the transmitter. The limit for the flange connection itself can be dimensioned higher according to the pipeline standards.
"There are many users who require significantly higher temperature limits than 120°C for their manifolds", commented Markus Häffner, Head of Design & Development at the industrial valve manufacturer AS-Schneider.
Although during normal operation, the valves and manifolds are not exposed to such temperatures, there was a possibility of such a situation during, for example, a system fault. "Several customers thus want to be optimally prepared," Häffner added.
AS-Schneider supplies the E Series Valves and Manifolds with either PTFE or graphite sealing. The former are clearly at a disadvantage when used at high temperatures.
With graphite, the carbon does not show any appreciable deformation even with extreme temperatures thus providing for a durable, leakage-free flange connection.
"The graphite is not extruded even at 350°C. The flange connection was just as stable after the test as before it." The maximum possible operating temperature is even higher. E Series Valves and Manifolds with graphite packing can be used at up to 550°C. The user, however, is responsible for ensuring that the flange connection including the bolts can withstand the process requirements such as pressure, temperature and chemical load. They provide maximum safety and trouble-free plant operation for all application cases.
Edited from press release by Angharad Lock
Read the article online at: https://www.worldpipelines.com/product-news/10062016/e-series-valves-and-manifolds-can-take-the-heat-2598/