Behind Closed Doors: Pipeline Closures Revisited

Proceedings Publication Date:

29 Apr 2019
Presenter
Alan Morton
Presenter
Company
Author
Alan Morton, Kolton Landreth
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Abstract

Pipeline doors or “closures” are commonplace in the pipeline industry, providing access to the pipeline itself as well as to high-pressure equipment associated with the pipeline such as filters, separators, strainers, etc. Despite their prevalence, the importance of closures to the safe and efficient operation of a pipeline system is often overlooked. Recent changes in closure definitions and terminology warrant a review of the systems, applicable standards, designs and considerations related to choosing a closure for a desired purpose.

 

The industry defines what a closure is in a variety of ways. One definition, for example, is a pressure-containing component used to blank off an opening nozzle on a vessel or end of pipeline — which could mean a bolted blind flange, a T-bolt cap or a “quick-opening” closure.  ASME B31.4 and ASME B31.8 defines a “quick-opening” closure as a pressure-containing component used for repeated access to the interior of a piping system. ASME VIII-1 UG-35.2 (a) (1) defines quick-actuating closures while UG-35.3 (a) (1) defines “quick-opening” closures, both of which permit substantially faster access to the contents space of a pressure vessel than would be expected with a standard bolted flange connection. There are several ways the current codes can be interpreted, but what does it all mean?

 This paper will present a history of pipeline closures from the early development to recent innovations. The paper will address:

 

  • The different type of closures available and pros and cons of each.
  • Safety systems
  • The importance of the sealing element, including material, where it is located, how it is energized, low pressures, rapid decompression issues, etc.
  • Locking elements versus Holding elements.
  • The importance of proper maintenance.
  • The use of the appropriate materials.
  • Horizontal versus vertical configuration.
  • Offshore versus onshore operation.

     

Keywords: Pipeline, Closures, Quick-Opening, Quick-Actuating, ASME B31.4, ASME B31.8, ASME Section VIII.

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