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Title: Recent advances in piggable wye design and application
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3065e
Date of Publication: 1990
Price: $25.00 US
Authors: T Jee, M Carr, Dr A Palmer
Abstract: There are four subsea piggable wye junctions in the North Sea at present (Fig.1) and four more are on the way. The offshore oil and gas industry is quite rightly cautious about having them, with concerns centring on whether they can be reliably pigged. On the other hand, as operators concentrate on developing the existing pipeline infrastructure, wyes show many advantages, particularly in reducing the number of import risers on platforms from other fields. These two main issues: the design of piggable wyes and their applications, are addressed in this paper. Ways of improving on present designs are identified, and the potential for use of wyes in field development is discussed.

Regarding design, this paper reviews the designs that have been used to date, the pigging tests which were carried out on them, and operators' experiences of pigging them in practice. Based on recent work on the design of wyes for two high-pressure gas pipelines, this paper goes on to suggest ways of improving present designs to make them lighter and more easily manufactured.

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