Modern societies have hundreds of thousands of miles of crisscrossing its length and breadth feeding critical sectors of the society. Everything seems dependent on the products of these endless economic resources from gas to fuel to water and liquefied natural gas and other chemicals. The truth is there can’t be a success in feeding various industries its needed energy and other vital input without the pivotal role of valves providing amazing services that are keeping all fluid flow and control systems running seamlessly every day.
What is a pipeline and what does it contain?
The pipeline is a network of pipes strategically designed, constructed and installed to deliver fluid content for various sectors of the economy. It comprises pipes joined together by valves playing operational, control, pressure and temperature regulatory roles to ensure its content reach its destination safely and promptly.
Pipelines serve different purposes and are built to deliver different content. Those constructed for oil and gas service are created and tested following the American Petroleum Institute (API) specification 6D “Pipeline Valves. The International Organization for Standardization (ISO) 14313 also published the document, which includes this site requirements for the ball, gate, check and plug type valves. Before the middle of the 1950s, valve choice for use in pipeline blocking applications was easy. The gate valves were used because the pipeline ball valve had not been invented yet.
Pipeline valves application choices
Over the past few decades, the sales of pipeline gate valves crashed with the advent of quality pipeline ball valves. In the meantime, pipeline ball valves (the trunnion style) are now making inroads in all types of pipeline service, particularly in natural gas.
Various types of valves are needed for successful and safe pipeline operation. They are useful in pipeline maintenance and also during an emergency situation. in case of leaks, Pipeline block valves will find a useful application in limiting the release of line contents – these valves are “sectionalizing block valves.
To deter tampering by unauthorized persons and to ensure the safety of pipeline operations, a lockable grill cage is provided over the Sectionalizing Valve installation including piping and instrumentation.
- Onshore: Notwithstanding the ANSI/ASME requirements (Article 434.15.2/846.11) the spacing of sectionalizing block valves should consider limiting the pipeline liquid contents between adjacent valves.
- Offshore: There is no requirement for sectionalizing block valves in offshore pipelines.
It may not always be possible to achieve complete leak tight isolation, but flow should, in any case, be severely limited so that the primary objective is met, i.e., the fluid within the isolated sections is contained.
Question of integrity
For pipeline owners, and people working or live close to the piping system, Valve integrity is paramount. A complicated risk assessment formula is used to guide pipeline operators with inspection programs. The age of the pipeline, product, and proximity to population centers, local housing, and occupied structures are essential information to include in the assessment criteria.