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NFPA: National Fluid Power Association

NFPA, the National Fluid Power Association, is a nonprofit organization that develops and publishes standards related to the hydraulic and pneumatic industries. Headquartered in Milwaukee, United States, NFPA standards are propagated by its 340 member companies, which, while focused in the NAFTA region, are spread throughout the world. NFPA also serves as the administrator for the U.S. TAGs (United States Technical Advisory Group) to ISO/TC 131 (International Organization for Standardization/Technical Committee) and to many of the subcommittees for ISO/TC 131. Standards from NFPA-Fluid are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: StandardsSubscriptions@ansi.org or 1-212-642-4980 or Request Proposal Price.

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NFPA/T2.6.1 R2-2001 (R2019)

Fluid power components - Method for verifying the fatigue and establishing the burst pressure ratings of the pressure containing envelope of a metal fluid power component

This standard provides: test and statistical methods for generating fatigue distribution data; test and statistical methods for conducting a verification of the pressure ratings on fluid power components; common requirements and an industry-wide philosophy in judging one type of pressure capability for fluid power components; uniform methods of product comparison. This standard limits conditions as follows: constant amplitude, pressure induced loading of the elements that constitute or maintain the pressure containing envelope; product life of at least 100,000 cycles; defined conditions for pressure levels and pulse durations; temperatures from the charpy impact transition temperature to the threshold of creep sensitivity; environments which are chemically compatible with the materials of the pressure contining envelope; materials that are aluminum, magnesium, steel, iron, copper based alloys, cobalt, titanium, stainless steels, nickel steels and monel. Specifically excluded are creep sensitive materials such as: zinc, plastic, rubber and sealing devices. This standard encourages manufactureers to use this common method to enhance the credibility of their pressure ratings.


NFPA/T3.6.37 R1-2010 (R2020)

Hydraulic fluid power - Cylinders - Method for determining the buckling load

Establishes a method to calculate the theoretical critical column buckling load of a loaded fluid power cylinder.


NFPA/T3.21.3 R1-2008 (R2018)

Pneumatic fluid power - Flow rating test procedure and reporting method - For fixed orifice components

This method is to be used as an alternative to ISO 6358, which is recognized as the preferred flow rating test procedure and reporting method.


NFPA/T3.6.37 R1-2010 (R2020)

Hydraulic fluid power - Cylinders - Method for determining the buckling load

Establishes a method to calculate the theoretical critical column buckling load of a loaded fluid power cylinder.


ANSI/(NFPA)T3.16.2 R1-1997(R2005)

Hydraulic fluid power - Design for nonintegral industrial reservoirs

To include nonintegral reservoirs applicable to fluid power hydraulic systems as defined in ANSI/B93.2 except reservoirs, sealed, pressurized, and where size does not permit. Intensifiers and air-oil storage tanks are sometimes considered reservoirs, they are not included within the scope of this document. Although filters are frequently located in reservoirs, filters are separate components and are not included within the scope of this standard. Refer to separate documents, such as ANSI/(NFPA/JIC)T2.24.1, for filtration requirements. The purpose of this document is to establish basic requirements for the design, construction and selection; to provide the proper function and maintenance features; and to allow manufacturer's freedom of design within these basic requirements. This document in no way prevents applying integral hydraulic reservoirs, nor fabricating and applying nonintegral reservoirs of less comprehensive features and construction. However, it does provide the machine tool or related equipment purchaser with the option to specify a proven design, quality components, good workmanship practices, and maintenance cost reduction technique.


NFPA/T2.12.1 R1-2002 (R2019)

Hydraulic fluid power - Systems and products - Method of measuring average steady-state pressure [to be used in conjunction with (NFPA/T2.12.10]

This standard is limited to the measurement of average steady-state static pressure in a closed conductor that meets the following criteria: must be transmitting hydraulic fluid power; average fluid velocities are less than 25 meters per second (82 ft/sec); average steady-state static pressure is less than 70 Mpa (10,000 psi); inside diameters are greater than 3.0 millimeters (0.120 in); sensor is not flush-mounted with, or an integral part of, the closed fluid conductor wall.


NFPA/T2.12.10 R1-2002 (R2019)

Recommended practice - Hydraulic fluid power - Systems and products - Testing general measurement principles and techniques [to be used in conjunction with NFPA/T2.12.1]

Use of this recommended practice shall be limited to measurement situations encountered in the testing of hydraulic fluid power components or systems under static or average steady state conditions and include: general instrument calibration techniques; methods for assessing instrument uncertainties and measurement uncertainty; evaluation methods for error propagation in derived results; measurement system uncertainty assurance control techniques; criteria for system measurement acceptance.


NFPA/T2.12.11-2-2007 (R2017)

Hydraulic fluid power components - Assessment of reliability by testing

This recommended practice provides guidelines for assessing the reliability of hydraulic components by testing and reporting for components used in fluid power systems.



NFPA/T3.4.7 R2-2000 (R2019)

Accumulator - Pressure rating supplement to NFPA/T2.6.1 R2-2000, - Fluid power components - Method for verifying the fatigue and establishing the burst pressure ratings of the pressure containing envelope of a metal fluid power accumulator

This standard provides: test and statistical methods for generating fatigue distribution data; test and statistical methods for conducting a verification of the pressure ratings on fluid power accumulators; common requirements and an industry-wide philosophy in judging one type of pressure capability for fluid power accumulators; uniform methods of product comparison. This standard covers the pressure containing envelope of the following accumulator types: piston; bladder; diaphragm; direct acting; mechanical; mechanical spring; mechanical weighted; metal bellows; gas bottles, are also included, only when they are used as an extension of the gas volume of one of the above mentioned accumulators. This standard limits conditions as follows: Follow 1.2 from NFPA/T2.6.1 R2. This standard encourages manufacturers to use this common method to enhance the credibility of their pressure ratings.


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