Technip France

Aurélien Pepin

Tomasz Tkaczyk

Sylvain Denniel

Brett Patrick Howard

Daniel Bertaso

John Hamilton

Brett Howard

A reelable mechanically lined pipe (MLP) () having at least a liner () and an outer pipe (), the outer pipe having an outer diameter, DH, with the MLP formed from a plurality of pipe joints having conjoining girth welds (), wherein the ends of each pipe joint terminate with clad overlay welds () having a length in the range L=100 mm and L=4D, and wherein the liner thickness, t, is equal to or less than a value calculated by formula I as defined.

Mechanically lined pipe

A method of manufacturing a mechanically lined pipe (MLP) having an outer pipe and an inner liner comprising at least the steps of: (a) forming the outer pipe as a single length; (b) forming an inner liner former being wholly or substantially the same length as the outer pipe of step (a); (c) locating the inner liner former of step (b) within the outer pipe; and (d) expanding the inner liner former within the outer pipe to form the MLP.

Method of manufacturing a mechanically lined pipe

Methods of reel-laying a mechanically lined pipe (MLP) are described. These include the steps of: spooling the MLP () onto a reel () in the complete or substantial absence of internal pressure above ambient pressure in the MLP; spooling off the MLP from the reel; aligning and straightening the spooled off MLP, in the complete or substantial absence of internal pressure above ambient pressure, to provide an MLP for laying; and/or the steps of: spooling the MLP () onto a reel () resulting in the formation of wrinkles in the spooled MLP; spooling off the MLP from the reel; aligning and straightening the unspooled MLP to provide an MLP for laying having wrinkles &#x3c;4 mm high, removing wrinkles, if any, while performing the hydrotest which is used to check fluid tightness of the line. By minimizing the size of the wrinkles and/or particularly selecting the liner of the MLP, the methods of the present invention allow safer, faster spooling and spooling off to be effected to provide safer, faster and more economical laying of an MLP.

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Aberdeen, United Kingdom

Aurélien Pepin