Corrosion and erosion are major concerns in thermal power plants operating on steam. Sampling systems are often used to monitor the steam’s quality. These complex systems require a high temperature shut off system to ensure the process sample’s fluids are always below the maximum allowable temperature for process analyzers and similar instrumentation downstream.
Steam sampling is usually required for chemical, petrochemical and refining processes to ensure modules and reactors don’t crack or overheat and processes don’t materialize. To mitigate risk of operational failure, corrosion or cracking due to steam impurity, steam and condensate analysis is recommended. A Steam and Water Analysis system (SWAS) can help in monitoring the critical parameters in the steam and is equipped with many crucial components to protect the instrumentation downstream including sample coolers, pressure reducers, and thermal relief valves.
Excessively hot samples can cause damage to expensive and sensitive hardware and electronics. These components bring down the temperature and pressure of the steam or water in the sampling system to an acceptable range for the sensors of the analyzers and equipment. The thermal relief valve is especially important as it is a fail-safe for the sample cooler to ensure that no high temperature water or steam reaches the expensive analyzer equipment. It is designed to immediately shut off sample flow when it exceeds safe temperatures.
The HST (High Sample Temperature), HAT (Heat Actuated Trap), or TV/HAT (Tube Valve Heat Actuated Trap) can be used as thermal shutoff valves in sampling systems to protect downstream analyzers, instruments and personnel from high temperature damage. The valve should be installed after the sample cooler to monitor the sample temperature as it leaves the cooler. The valve will remain open as long as sample temperatures are under the set-point of the valve. If the sample temperature increases above the set-point, the valve’s internal thermal actuator will cause it to close, protecting downstream analyzing equipment from damage.
The HST is used to protect electronics in sample analyzers from over-temperature in case of sample cooler failure, it is rated for 3000 PSIG (207 BAR) which makes it ideal for high pressure applications. The media samples include sour gas, SWAS (steam water analysis system), and fractional distillation such as refinery gas, petrol, naphtha, kerosene, diesel oil and residue.
In aircraft, it is possible that the galley faucet can produce scalding water putting crew and passengers in danger. This happens when a coffee maker’s boiling water back flows through a shared manifold and releases it through the airplane faucets. ThermOmegaTech®’s HAT and TV/HAT valves, installed between the manifold and faucet, is designed to continuously sense water flow and automatically shut off flow once the temperature rises to unsafe levels. Once the water has cooled, the valve will re-open to re-establish flow through the faucets.
Implementing a high temperature shut off valve into your system protects analyzers, equipment and personnel from scalding temperatures and operation failure. ThermOmegaTech®’s economically reliable high temperature shut off valves are completely mechanical and require no external source of electricity to operate guaranteeing protection for your equipment and personnel.