Engeering Horizon

EH JULY 2017 – EMISSION STANDARDS FOR VALVE PACKINGS

EH JULY 2017 – EMISSION STANDARDS FOR VALVE PACKINGS

September 14
17:02 2017

EMISSION STANDARDS FOR VALVE PACKINGS

By: ESA Member Cor Wagner

The petroleum and chemical industries have been looking for meaningful standards that will enable the qualification of valves and packings that meet the increasingly stringent fugitive emission regulations, which have increased since the 1990s. The focus has been on the main source of the emissions—valve stem packing. Several companies have evaluated current industry standards and have crafted testing protocols specific to their application requirements. However, as the industry moves forward, end users and valve manufacturers should consider using a standard that best fits their needs.

1) EN-ISO Standards

 The International Standards Organization (ISO) developed EN-ISO 15848-1 and 2. This two-part standard used information from a wide range of industry sources. The standard incorporates the testing of commodity valves as well as control valves. Industrial valves—measurement, test and qualification procedures for testing fugitive emissions of industrial valves are described. Part 1 addresses a classification system and qualification procedures for type testing of valves, while part 2 covers production acceptance testing of valves.

  1. a) EN-ISO 15848 – Part 1 (February 2006)

Included in part 1 is the testing of completely assembled valves using vacuum, flushing or sniffing (EPA Method 21), depending on which annex is used and the type and class of the valve. The standard uses helium or methane as the test fluid and only permits one adjustment to the valve packing every performance cycle. Valves are typically tested vertically with horizontal as an option, with cycling rates based on the type of valve: isolating or control. Stem packing leakage is categorized in so called Tightness classes, A, B and C, for both helium and methane. The difference between the leakage of helium and methane is not correlated.

Share

About Author

Engineering Horizons

Engineering Horizons

“Engineering Horizons” is the first & leading technical magazine of Pakistan covering Process, Mechanical, Metallurgical, Mining, Electrical & Electronics field under a single cover. We also feel pleasure in saying that this is the only magazine of its own kind & style, which is widely circulated in all Engineering Sectors of Pakistan.

Related Articles

Latest Magazine

Advertisements