Snamprogetti

Cesare Miola

Franco Granelli

Sergio Menicatti

The present invention relates to a new type of lining with two layers, one of which, obtained by welding deposit, can be used for the protection of internal surfaces of chemical equipment capable of abide pressures lower than 100 MPa, in processes for the direct synthesis of urea. The present invention also relates to an original method for the preparation and installation of this lining, by the assembly of laminar elements with two layers, obtained by welding deposit on relatively thin stainless steel plates, so as to avoid significant distorsion effects on the plate itself.

Protective lining for pressure equipment which can be used in processes for the synthesis of urea

Method for the safety and extension of the operating life of pressure equipment having an internal chamber suitable for containing a process fluid, surrounded by a pressure-resistant body (,) equipped with weep-holes (,), made of a material subject to corrosion by contact with said process fluid operation, coated inside with an anticorrosive lining (,) made up of several elements welded to each other, wherein said lining weldings (,) are completely isolated from contact with the process fluid of the normal operating run, by a coating with adjoining strips (or plates) (,), of the same material as said lining (,) or other corrosion-resistant material weldable thereto, which are subsequently seal-welded on the edges to said lining (,) and to each other, characterized in that the arrangement and welding of the edges of these strips (,) are such to create a network of underlying interstices (or meati) (,), communicating with each other and at least one weep-hole.

Safety process for pressure equipment in contact with corrosive fluids

Method for restoring the functionality of equipment subjected to heavy

Process and apparatus for the production of urea, wherein the carbamate decomposers and/or condensers are equipped with stainless steel tubes internally lined with zirconium.

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Sannazzaro, Italy

Cesare Miola