Deflection in the Joint Saves Thousands in Fittings

When the original Ejoint/socket field joint was developed in the 1970s, little did the designers know that nearly 50 years later this simple but effective idea would still form the basis of efficient pipe laying. The concept was to increase good practice and safety by providing a solution for welded pipelines that did not require man access and internal repair post welding operations.

Key in the development of this unique field joint were the fabrication shop Lortub; their role was to provide fittings to the same dimensions and tolerance as the mill producers. Today Lortub provide this function as part of FT Pipeline Systems’ supply chain. Understanding the intricate details of the joint manufacture, the importance of pipe ends within the ovality requirements of EN 10224 and the use of a cold expanded socket to ensure minimal and uniform welding gaps all contribute to FT Pipeline Systems’ successful work across the UK.

Deflection in the socket also allows shallow curves to be accommodated when laying pipework in the field. This can make a significant contribution to cost saving on the job as it can help remove bends from the scope which in turn reduces on site cutting and fabrication, and at least one field weld for every fitting is eliminated.

Two recent examples (see pictures above) show 1600mm Ejoint/socket joint pipes accommodating the shallow curve as the pipework crests a hill. The second shows a smaller diameter (700mm) with specific deflection accommodated within the tight constraints of a trench. The 700mm pipe run was also plotted out by our fabrication partners from the design data provided and a suite of drawings was then produced for approval prior to manufacture commencing.

For more information and assistance with your steel pipe scheme, contact us on 01543 416024 or email us at:


FT Pipeline Systems Ltd
6B Eastern Park
Eastern Avenue
WS13 7SY

Tel: 01543 416024

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