{"id":8521,"date":"2022-04-01T12:53:30","date_gmt":"2022-04-01T10:53:30","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=8521"},"modified":"2022-04-01T12:53:30","modified_gmt":"2022-04-01T10:53:30","slug":"fluids-and-carbon-steel-in-plate-heat-exchangers","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/8521\/fluids-and-carbon-steel-in-plate-heat-exchangers\/","title":{"rendered":"Fluids and carbon steel in plate heat exchangers"},"content":{"rendered":"

How connections on plate heat exchangers<\/strong><\/a> are made to avoid contact between the fluid and carbon steel<\/strong>? This is a question that I\u2019m often asked for.<\/p>\n

If the fluid employed within the exchanger presents no particular problems in getting in contact with carbon steel, the fluid entering the flange of the exchanger gets then in direct contact with the material. Thereafter, it enters the exchanger and here it gets in contact with the stainless steel of the plates<\/strong>. But very often, it is necessary to avoid the contact of the fluids with components and materials that are prone to oxidation and corrosion<\/a><\/strong>. In this case, it is mandatory to avoid any possible contact of the fluid with carbon steel<\/p>\n

Plate heat exchangers can have two main connection options<\/strong>, with flanged or threaded connections<\/a><\/strong>. Flanged connections make the trick quite easy, in fact it\u2019s sufficient to coat the body in the nozzles area using elastomers<\/strong>, such as nitrile, ethylene-propylene or viton, or using stainless steel<\/strong> AISI 304 or AISI 316. The inner part of the body in the nozzle area is protected as well by this lining. The gasket of the first plate gets then in contact with the circular ring of this lining, so that the fluid flowing through the body enters between the first two plates, never getting in contact with carbon steel<\/strong>. The final plate is a blind plate, so it never gets in contact with carbon steel either, remaining always in contact only with the plates in stainless steel.<\/p>\n

Speaking of it, fluids never flow between the first plate and the body, they always enter directly between the first two plates.<\/p>\n