Customer Benefits

• Formulated to promote energy efficient heat transfer performance.
• Oxidation and thermal stability helps resist harmful sludge and coke formation and contributes to long oil service life.
• Low temperature fluidity assists rapid system start-up.
• Low vapour pressure at elevated temperatures helps minimise evaporation, vapour lock and pump cavitation.
• Efficient low pressure operation avoids the need for expensive high pressure pipe-work and heat exchanger systems.

Product features

• Promotes energy efficient heat transfer.
• Helps prevent harmful sludge and coke formation.
• Assists rapid system start-up.
• Aids efficient low pressure operation.

Applications

• May be used in heat transfer systems in industrial drying applications, rubber and plastics manufacture, heating of asphalt and fuel oil tanks, food processing, cooking and canning, factory heating, manufacture of soap, resin, glue, dyes, paints, pharmaceuticals and grease, wood laminate, fibre board and veneer manufacture, agricultural heating and drying, and chemical, petroleum and wax processing.
• Maximum bulk oil temperature 288oC.
• Maximum film temperature on heater surfaces 316oC.
• Maximum temperature of oil surface in contact with air in open systems 107oC.

Systems must have forced circulation of the heat transfer fluid.

Service Considerations

Certain precautions should be taken to ensure satisfactory performance of heat transfer fluids in service:

System Cleanliness
The heat transfer system, whether new or used, should be thoroughly cleaned and flushed with Regal HTO before being placed in service. Sometimes this cleaning will require the use of chemical cleaners, usually in the form of an alkaline cleaning agent. These products are supplied, and are usually applied, by specialist industrial cleaning companies. In use they are often mixed with very hot water and pumped continuously through the system to remove deposits. If such chemical cleaners mixed with water are used, all traces of water and the cleaner must be removed from the system prior to it being brought back into service. Hot air blowing will usually successfully remove residual water.

Heat Transfer System Materials
Iron and steel are the preferred materials for heating system construction. Copper and copper alloys should not be used in heat transfer systems with a hydrocarbon fluid unless air (oxygen) is excluded from contact with the fluid by hermetic sealing and/or an inert gas “blanket”.
The heater should be constructed with a minimum of refractory to improve thermal response, and to reduce heatsoak into the fluid in case of pump failure.

System Seal
Hot heat transfer fluid must be prevented from contacting the air in the expansion tank since air will cause rapid oxidation. To accomplish this, the expansion tank should be located and piped so that fluid in it remains cool (below 55°C).

Hot Spots
The system should be free of hot spots which will degrade the fluid and cause the formation of hard carbon deposits on the system surfaces. The fluid should be circulated through the heater with a fully turbulent flow, with a surface speed between 2 and 3 metres per second, depending on surface geometry and operating temperature. The system should be designed so that:

1. The circulating pump is started before heat is applied to the heater.
2. The circulating pump runs for some time after the heater is turned off.
3. The heater will shut off in the event of circulating pump failure or the development of excessive temperatures.

Full fluid flow must always be maintained through the heater, regardless of the conditions at the heat exchanger. The system should be designed for the bypass of fluid at the heat exchanger if the full fluid flow is not required there. This will ensure that full fluid flow is retained at the heater.

In-Service Oil Testing
The viscosity, acid number, flash point and insolubles content of the in-service fluid should be monitored regularly. Samples should be taken within a few days of start-up, and every six months afterward. Generally, it is the rate of change of in-service fluid properties which indicates the suitability of the fluid for further service.