If you are interested in participating on ISA96, please contact the Chairman, Vince Mezzano, or the ISA Standards Administrator, Eliana Brazda, at ebrazda@isa.org or(919) 990-9228.
Scope
The Committee will develop standards and technical reports related to valve actuation. Areas to be covered are as follows:
ISA96.01 The basic requirements for terminology for valve actuators and their accessories. This standard provides a glossary of definitions commonly used in the valve actuator industry.
ISA96.02 The basic requirements for electric valve actuators for both on-off duty and modulating applications. The standard will include guidelines and recommendations for the basic manufacturing design, device protection, documentation and testing. The standard provides general requirements for the development of specifications for electric actuators. The standard also provides a guide to assist the user in specifying electric valve actuators.
ISA96.03 The basic requirements for pneumatic valve actuators of the single- and double-acting types used for on-off applications. The standard will define the basis pneumatic actuator types (i.e., scotch yoke, rack and pinion, rotary vane, and linear piston type). The standard will include guidelines and recommendations for the basic manufacturing design, device protection, documentation and testing.
ISA96.04 The basic requirements for hydraulic valve actuators of the single- and double-acting types used for on-off and modulating applications. The standard will define the basic hydraulic actuator types (i.e., linear or rotary). The standard will include guidelines and recommendations for the basic manufacturing design, device protection, documentation and testing.
ISA96.05 The technical report is limited to providing guidance related to using partial stroke testing of block valve actuators in Safety Instrumented System (SIS) applications; it is informative and does not contain any mandatory requirements. The technical report is limited to automated valves normally operating in either a full open or full closed position. The boundary of the automated valve includes the following:
- Limit switches and other monitoring devices
- Air regulation and filtration system
- Actuated valves whose fail position is specified as spring-return fail closed, spring-return fail open, or double acting
- Valve body specified to meet the functional requirements for its application
The technical report does not address automated valves used for regulatory control applications. Guidance is provided on the following:
- Identifying when partial stroke testing may be useful
- Various criteria to consider when selecting the partial stroke method, e.g., automated versus manual test execution, spurious trip potential, and on-line maintainability
- The advantages and disadvantages of three basic types of partial stroke test methods: mechanical limiting, positioners, and solenoid operated valves
- The use of diagnostic coverage factors in the performance calculations for an automated block valve being partial stroke tested periodically
ISA96.06 The standard provides basic requirements for electro-hydraulic part-turn and linear actuators both double acting and single acting, used for on-off/isolating and regulating/positioning duties. It includes guidelines,recommendations and methods for sizing, design, diagnostics, control and testing.
ISA96.07 The standard provides basic requirements for valve actuator accessories.
ISA96.08 The standard provides basic requirements for mechanical integrity, selection and sizing of gas over oil actuators, both rotary and linear, provided in double and single acting designs.
Purpose
To provide basic requirements for pneumatic, electric, hydraulic, electro-hydraulic, and gas over oil actuators. Definitions of terms, performance requirements, and basic design criteriafor sizing and selection will be developed.
ISA Meetings
ISA96 committee and subcommittee meetings were held 23-25 September in conjunction with the 2016 Fall Leaders Meeting in Newport Beach, California. The meetings were well-attended and the majority of meeting time was spent responding to comments from recent ballots and preparing new documents. Information about the next series of meetings will be posted shortly, and agendas and additional details will be distributed as soon as they are available.