NFPA's Industry-wide Program
for Reliability
Moves Ahead
 NFPA’s industry-wide program for reliability took its first step to completion with the publication of NFPA/T2.12.11-2-2007,
Hydraulic fluid power components – Assessment of reliability by testing. See below for more information about this document.
The next step will be the publication by June 2007 of related ISO standards for assessing the reliability of pneumatic components (specifically directional control valves, piston rod cylinders and pressure regulators) as ISO 19973 parts 1 through 4.
The NFPA hydraulic reliability document
The newly published Recommended Practice NFPA/T2.12.11-2-2007 provides guidelines for assessing the reliability of hydraulic components by testing and reporting for components used in fluid power systems. Specific requirements for assessing the reliability of the components are contained in annexes for the following components: accumulators; hydraulic cylinders; hydraulic filters; hydraulic pumps and motors; and hydraulic valves.
It provides:
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general requirements for reliability testing;
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statistical methods for assessing reliability;
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an example of reliability calculations; and
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annexes with specific test guidelines and threshold level criteria for each component listed above.
To purchase NFPA/T2.12.11-2-2007,
Hydraulic fluid power components – Assessment of reliability by testing,
click
here.
Project history
Work on the reliability standards started in 2001 in NFPA’s technical committees. In autumn 2003, ISO/TC 131 took over the development of standards for assessing the reliability of pneumatic components through testing. These are:
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ISO/FDIS 19973-1 (general procedures for assessing the reliability of pneumatic components by testing),
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ISO/FDIS 19973-2 (assessing the reliability of pneumatic directional control valves),
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ISO/FDIS 19973-3 (assessing the reliability of pneumatic piston rod cylinders), and
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ISO/DIS 19973-4 (assessing the reliability of pneumatic pressure regulators).
International round robin test programs are being conducted to verify the procedures specified in these International Standards.
Meanwhile, ISO/TC 131 is also working on an ISO technical report for assessing the reliability of hydraulic components through a variety of means, including testing, which differs from the NFPA document.
For more information about the NFPA project, contact Carrie Tatman Schwartz at (414) 778-3347, or e-mail:
ctschwartz@nfpa.com. For more information about the ISO projects, contact Karen Boehme at (414) 778-3345 or e-mail:
kboehme@nfpa.com.
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