Joints for conduits having a continuous corrosion-resistant lining

Claim 1

An arrangement for connecting the opposite ends of said pipe sections to form a continuous conduit adapted to convey corrosive liquids, said arrangement comprising two metal pipe sections provided with a corrosive-resistant coating at the inner surfaces thereof which covers also end faces of the pipe sections and part of the outer surface thereof adjacent said end faces; a pair of sockets one for each pipe section, each socket having at one end an inner diameter substantially equal to that of the outer diameter of the respective pipe section and being fixedly connected at said one end with the respective pipe section spaced from the end faces of the latter and projecting with the remainder thereof having a greater diameter than that at said one end beyond said end face of the respective pipe section; a sleeve at each end face of said pipe sections, said sleeve af a material resistant to heat and to the corrosive influence of the liquid to be conveyed between the end faces of said pipe sections; connecting means including a connecting member between said sleeves and said other ends of said sockets connected to said pipe sections, said connecting member having an outer tubular wall portion of a diameter substantially equal to that of said other ends of said sockets and inner tubular wall portions connected to said outer tubular wall portion and having a diameter substantially equal to that of said pipe sections, and a pair of weld seams serving to connect said outer tubular wall portion at opposite ends to said other ends of said sockets with said inner tubular wall portions abutting against said sleeve, each of said sleeves having a portion located inwardly of the respective weld seam, whereby during forming of the weld seam damage to the coating by heat is prevented.