IN THIS ISSUE: Thermal Fluid Startup, Shutdown Tips • Control Guide • Biopharm Inline Steaming System • Heat Shrink Tubing • Ceramic Media for Oxidizers • and more
DuraTherm Offers Startup and Shutdown Tips Regardless of system design, size or heat source, a few basic procedures should be followed when starting up or shutting down a heat transfer system. DuraTherm Extended Life Fluids, Lewiston, N.Y., says following these basic procedures can help maximize the life of fluids:
During system startup, keep the following pointers in mind:
A fluid at room temperature may have a viscosity as high as 100 cSt, but if the system is outdoors and the ambient temperature is below 32°F (0°C), the viscosity could be 1,000 cSt or higher. A fluid at these viscosities is easily pumpable but is not yet ready for full heat.
A heater, whether small and electric or large and gas fired, is designed to apply heat at a set rate in consideration of the fluid's flow or velocity. When a fluid has not achieved the ideal viscosity, its flow or velocity will not be that specified and required by the heat source, meaning the fluid will be too thick to allow efficient flow. If a heater is allowed to fully fire during these periods, it likely will overheat and thermally degrade, meaning the fluid will pass the heater slowly and absorb too much heat.
When starting up any system, it is important to allow gradual temperature increases until the fluid's flow or velocity is within the boiler's required range. Generally, a 20 to 30°F (11 to 16°C) incremental increase in setpoint will allow for steady, even heating without the chance of overheating or thermally degrading the fluid.
During system shutdown, remember:
During the course of normal operation, both small electric heaters and large gas-fired boilers will be cycling either on and off or from low fire to high fire to maintain the set temperature. Within a short period of time, the heater piping or vessel will become nearly as hot as the heat source itself.
It is important to remember that the heater is actually hotter than the output temperature. The actual temperature at the impingement point of the heater may be higher than that of the recommended maximum fluid temperature.
Avoid abruptly shutting down the system without allowing the heat source and adjacent areas to cool. If you don't, when the fluid ceases to flow, it will become trapped and subsequently burn or thermally degrade. When shutting down any system, it is important to allow the fluid to cool below 250°F (121°C) before shutting down the pump. Using a heat exchanger or leaving the heater blower running will help expedite cooling the fluid temperature to below 250°F.
Sludge to Water, Sludge to Sludge Komax™ patented Klean-Wall Sludge heat exchangers are used in municipal digester heating, livestock rendering heat reclaim, animal waste, digester heating, methane recovery operations and numerous other indirect heating applications where clogging is not an option.
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Heat Transfer Fluid Services Can Extend Fluid Life By utilizing your fluid manufacturer's product support services, you can extend the time between fluid replacements, lower your fluid makeup costs and improve system performance.
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Optimizing Flotation Dryer Operation
A flotation dryer must deliver a high quality end product in a cost-efficient fashion without compromising safety. To accomplish this goal, multiple cost and performance criteria must be evaluated before selecting a final design.
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PRODUCTS
Induction Heating System With a 3 by 3' footprint, Model HS-2 is designed for staking metal components to plastic assemblies. The turnkey induction heating system is equipped with a 2 kW induction heating power supply and a four-position induction coil. A side-mounted control console includes start/stop pushbuttons that place the system into auto-run mode. Full manual control is available for process development. Designed for open-air operation in a lean manufacturing environment, the system is intend to allow injection molders move the heating stage of the manufacturing process directly into the work cell.
Ceramic Media for Oxidizers Flexeramic for regenerative thermal oxidizer applications offers structured media elements composed of corrugated sheets of ceramic. The sheets are vertically aligned in the oxidizer media bed, eliminating horizontal surfaces that may create resistance to vapor flow. Geometric construction is intended to reduce vapor channeling and provide effective contact between the hot gases and ceramic surface. The media also is suitable for mass transfer processes such as sulfuric acid production and chlorine drying.
Aseptic Processing System Model M-7250CP includes a data-acquisition station that continuously monitors temperature, pressure and flow, enabling recording and printing of digital test data. Designed for biopharm applications, the Microfluidizer integrates machine controls, functions and data-recording. The system performs steam-in-place for aseptic processing of drugs in a cGMP environment and ultra-clean-in-place functionality to eliminate disassembly for cleaning. A PLC manages on-board sensor signals and coordinates audiovisual alarms, operator acknowledgement and motor control interlocks.
Coriolis Mass Meter Approved for hazardous areas such as FM Class 1, Division 1, Optimass 1300 records temperature, mass flow, density and concentration of both liquids and gases while offering secondary containment as a standard feature. The dual-straight-tube sensor is constructed of stainless steel and has an optimized flow splitter for minimal pressure loss. The coriolis mass meter is supplied with common process connections as well as hygienic connections.
Heat Shrink Protects Instruments Offered in various expansion ratios, Texfluor FEP operates in temperatures as high as 400°F (204°C) and is suitable for covering thermometers and other instruments that need protection. The heat-shrinkable tubing is supplied in an expanded state, allowing easy slippage over instruments, fittings and protrusions. When heated, the tubing conforms to the size and shape of the original object, providing a protective covering. It also may be used to repair electrical wiring, fittings, cords and other objects requiring protection from heat, water, dust or corrosion.
Vacuum Conveyors Constructed of stainless steel AISI 316L and powered by pneumatically driven vacuum pumps, C Series and UC Series are suitable for pharmaceutical applications. Both vacuum conveyors can transport 10 to 15 tons/hr of tablets, powders and granules. The UC Series also is equipped to transport pharmaceutical ingredients such as sugar, dextrose, magnesium oxide and starch. UC models also have an ultra-sanitary butterfly valve and a Gore Sinbran filter that can trap particles as small as 0.5 µm. FDA-approved silicone seals with a working range of -4 to 176°F (-20 to 80°C) are included.
Sludge to Water, Sludge to Sludge
Optimizing Flotation Dryer Operation
Induction Heating System
Ceramic Media for Oxidizers
Heat Shrink Protects Instruments
Vacuum Conveyors
