Question: In heat exchange applications involving corrosive media, how can the sheath material be selected based on medium characteristics to avoid corrosion perforation? The sheathed hot and cold exchanger isolates the resistance wire from the medium via a sheath, but the compatibility between the sheath material and the medium directly determines equipment life. The following outlines selection and maintenance key points from the perspective of application scenarios.
Before procurement, the medium composition, concentration, and operating temperature must be provided, and the sheath material should be selected against a material compatibility table. For example, for chloride ion-containing media, 316L stainless steel or titanium is preferred; for strongly acidic environments, PTFE coating may be considered. Avoid sheath corrosion perforation caused by improper material selection.
Compared with unsheathed structures, the sheath design reduces the risk of the medium directly contacting the resistance wire, making it suitable for heat exchange applications with high electrical safety requirements. During installation, ensure reliable grounding of the sheath and periodically test insulation resistance.
Determine the design temperature, pressure, and heat exchange area according to process requirements. The SLR-42 sheathed hot and cold exchanger is suitable for medium- and low-temperature heat exchange scenarios, with a working pressure not exceeding 1.6 MPa and a temperature range of -20°C to 150°C. Reserve a 10%-20% margin during selection.
Periodically inspect the sheath surface for pitting and cracks, and measure wall thickness. Establish replacement cycles based on medium corrosiveness, and record changes in operating parameters. In case of abnormalities, shut down promptly for analysis to avoid sudden leakage.
Suitable for chemical reactor heating, storage tank tracing, electroplating bath temperature control, and similar applications. In environments with corrosive media, the sheathed hot and cold exchanger can provide a reliable heat exchange solution.
