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Hastelloy sensors meet chemical industry needs

17 December 2013

The increasing use of specialty liquids and gases in the chemical industry requires pressure sensors to be constructed of materials that are able to withstand these elements, in accordance with industry safety regulations to ensure the safety of individuals.

In the oil production and process industries, NACE MR0175/ISO 15156 and NACE MR0103 regulations allow for the use of Hastelloy C276 with liquids and gases that come in contact with materials that can cause sulfide stress cracking (SSC) or stress cracking corrosion (SCC). In addition, Canadian regulations for piping and fittings in upstream and midstream piping require provincial registration of sensor fittings and materials under ASME B31.3.With the presence of hydrogen sulfide and chlorides in many chemical processes, nickel alloys offer higher survivability than standard stainless steels. AST uses thick Hastelloy diaphragms and a low operating strain to create a sensor that is able to offer long-term pressure measurement.

Utilising its own mems-pressure-sensor-technology,Krystal Bond Technology, AST designs its pressure sensors as a monolithic piece of material with no welds, O-rings, or fluid fills. Bulk silicon strain gauges are mounted directly to the top of the metal diaphragm using a special glass firing process. With high raw output signal, inorganic materials, and a thick diaphragm membrane, it can offer complete isolation of the pressure to the fitting and long-term stability.

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