Thermocouple Design Prevents Oil Leakage In Coke Plant Compressor Bearing Housing

Company: A major steel company in the US.

Challenge: The customer approached Conax regarding the thermocouple they used in their coke plant compressor bearing housing. The spring-loaded device is sealed so lubricating oil would not penetrate into the thermocouple enclosure. However, oil was leaking into the enclosure and shutting the compressors down. The thermocouple manufacturer could not solve the problem, and Conax was asked to submit a new design.

Solution: After reviewing a sample thermocouple, Conax submitted a design featuring a SLANS spring-loaded mounting system with a Viton O-ring. Because a 0.250″ diameter was required to connect into the compressor bearing, and the customer wanted a 0.125″ diameter probe for faster response, a 0.25″ stainless steel support tube was added to the assembly.

Impact: Problems with oil leaking into the housing have been alleviated without impacting response time.

Conax Enhances Design on Sensors for Siemens Westinghouse Turbine

Challenge: Deer Park needed a source for flashback thermocouples on a Siemens Westinghouse W501F gas turbine. They currently have four turbines with plans to bring two more on line in the future. Each turbine has 16 burner cans with two sensors on each burner can for a total of 32 sensors. They schedule maintenance once or twice per year, but unscheduled outages also occur.

The sensor assemblies use Type K sensor elements, with grounded junction and 316SST sheath, and operate at 700°F. Positioning of the sensor within the burner can is critical. If the sensor tip is off position by 1/2” either direction, a massive error in temperature results. They purchased the sensors from a local distributor, but were hoping to find a lower cost alternative.

Solution: Conax provided the desired cost savings while enhancing the design, shortening the sensor length to better fit the turbine.

Impact: We actually understand their business enough to refine the design to meet their needs. Conax expertise and design capability led to a subsequent quote on disk cavity thermocouples for the same turbines.