ASME TES-1:2020 pdf download.SAFETY STANDARD FOR THERMAL ENERGY STORAGE SYSTEMS: MOLTEN SALT.
(C) Immersion heaters shall be protected against overheating of the heating element.
(d) Immersion heaters shall automatically shut off when the molten salt reaches its temperature set point.
(e) The design of the molten salt system shall prevent physical access to the immersion heater while any pressure exists in the tank.
if) The design shall make it possible to isolate the heater for maintenance.
(g) Immersion heaters shall have automatic controls to ensure the heaters are operational only when the elements of the heater are fully submersed in molten salt.
(h) Immersion heaters shall have ground fault protection and a manual means of disconnection in accordance with NFPA 70.
(I) When an immersion heatet’ uses a thyristor/siliconcontrolled rectifier (SCR) to provide power switching, the SCR controller shall automatically detect a shorted SCR condition, provide alarm indication, and shut down the heater.
4.2.3.5 Tank Venting and BLanketing
(a) Molten salt storage tanks shall be vented to prevent the development of a vacuum or pressure sufficient to distort the tank during filling or emptying. The vents shall be sized in accordance with API STD 2000.
(b) Molten salt storage tanks shall have a means to relieve internal pressure above the maximum design pressure.
(c) Molten salt storage tank relief devices shall be protected against the solidification of salt mist within or at the inlet to the device.
(d) Vent piping shall direct the effluent from the device to a safe location and away from personnel, areas of the system providing essential services, and other equipment.
fr) Venting of the gas stream to the environment shall be in accordance with local regulations.
(1) Where regulations allow direct NOx discharge, vents shall discharge the gas stream at a height and location that prevents drift into areas associated with the system that are providing essential services, such as building and system controls and the receiver system tower structure.
(2) Systems that use nitrate salts and exceed 480°C (900°F) during normal operation shall have the venting system and its component parts designed to resist degradation from nitric acid.
(f) When the molten salt storage tanks are provided with blanketing, the blanketing shall be compatible with the salt composition.
4.2.3.6 Tank Instrumentation
(a) The tank shall have instrumentation to measure and report the level and temperature of the molten salt and pressure inside the tank. This instrumentation shall meet the requirements of ASME PTC 19.2 and ASME PTC 19.3.
(b) Instrumentation for tank pressure and salt level shall be protected to prevent salt solidification on the instru mentati on.
(c) The number and location of temperature measurements shall consider variation of temperature within the tank.ASME TES-1 pdf download.