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Dual Isolation is a necessary Safety Requirement during maintenance periods to protect Personnel from line pressures when working on downstream Processing Units. This procedure can require the upstream pipeline to be vented which involves employing a Double-Block-and-Bleed arrangement to ensure that two sealing mechanisms and a vented chamber exist between the pressurised source and the atmosphere.

Typically, this requires a small assembly or the inclusion of a double isolation valve which works by incorporating two valves into one integral body. This eliminates the need for extra joints, gaskets and bolting and mitigates the potential for leak paths. The integration of the two valves reduces the material mass and results in a lower cost, reduced weight and ease of maintenance.

However, both of these solutions require the use of two valves.

Double-Block-and-Bleed usually requires two mainline valves, a distance piece and a venting system incorporating another valve. The engineering, procurement, construction, installation and maintenance considerations of such an assembly are considerable.

If a single valve could address this Safety Measure it would be a significant step towards enhancing the Operational Performance, minimising CAPEX and OPEX and simplifying the Production Architecture.

In addition to the conventional two-valve and double isolation valve arrangements, BEL Valves has designed, engineered and manufactured two options that use a single valve to perform this function safely and reliably. Both employ Active Sealing which is not dependent on the line pressure.

The Expanding Gate Valve (EGV) and the Eccentric-Ball Valve (E-Ball) are single valves which meet API 6A, 17D, 6D and 6FA, ANSI B16.34 and ASME VIII, respectively. They are innovations that bring Performance Improvement, Savings in CAPEX and OPEX and Simplifications in the Design Layout and Installation. The EGV is available for Surface and Subsea applications in Bore Sizes from 1’’ to 42 ‘’ and the E-Ball, from 2’’ to 20’’NB, is rated for Surface Applications. Both are manufactured in Standard and Exotic Materials that comply with NACE/ISO Standards.

These valves work through a mechanical wedging action that enables the central cavity to be vented. Both Valves feature Firesafe qualification and bi-directional, metal-to-metal seals. Fewer valves mean fewer operators and fewer parts, fewer leak paths and the elimination of weld integrity doubts.

A single valve saves weight and space, and is easier and cheaper to install.