Tube skin thermocouples offer high accuracy and reliability in process heaters

Paul Boughton
A range of tube skin thermocouples for process heaters is now available, which offers higher accuracy and reliability over competing thermocouples currently available on the market.

Due to its 8mm diameter sheath made from Hastelloy-X, the ‘Fan Tip’ tube skin thermocouple, developed by Okazaki Manufacturing Company, can be bent and coiled to enable movement in both the horizontal and vertical axes. The 40mm end tip of the thermocouple is designed to be welded to the heater tubes on both sides, which significantly reduces the chances of the thermocouple breaking off whilst in service.

Currently used by BP, Esso, Exxon Mobil and STATOIL, the Fan Tip thermocouple is ideal for any process burning or heating applications, including hazardous area oil and gas, chemical and petrochemical installations. The Fan Tip is suitable for gas-fired, light fuel oil and heavy fuel oil heaters. The sheath can be supplied in either 316 stainless steel for gas-fired heaters, Hastelloy-X for light fuel oil, or dual sheath AR-161 version for arduous, heavy fuel oil applications.

The design of the Fan Tip thermocouple is such that it can be used in all process heater applications. The length of the sheath can be increased by up to 30 metres. The sheath can be bent in a cold state to meet any fixture and exit point on the heater tube.

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