Specification for Actuator???
Specification for Actuator???
(OP)
While API 6A gives some requirement for Actuator, other Valve standards/Specification does not go into details of actuator and the basic minimum requirement for actuator.
For Example when procuring ESDV, SDV and MOVs the Actuator requirements are never properly specified by the user (Including the likes of Shell and Exxon and Total) and the users and the contractors are fully dependent on the acuator supplier's disposal since the valve standards do not delve into this.
The query: Are there ISO or BS EN or ANSI standards that deals with the actuators?
I am trying to develop a general requirement for actuator for my company and am collecting and collating data on actuator (While API 6A gievs reference to some ISO for actuator, am not sure whether the requirement can be extended to other normal valves)
Any and all information are welcome.
For Example when procuring ESDV, SDV and MOVs the Actuator requirements are never properly specified by the user (Including the likes of Shell and Exxon and Total) and the users and the contractors are fully dependent on the acuator supplier's disposal since the valve standards do not delve into this.
The query: Are there ISO or BS EN or ANSI standards that deals with the actuators?
I am trying to develop a general requirement for actuator for my company and am collecting and collating data on actuator (While API 6A gievs reference to some ISO for actuator, am not sure whether the requirement can be extended to other normal valves)
Any and all information are welcome.





RE: Specification for Actuator???
The actuator manufacturers will tell you quick if their actuator IS made for the service that you specify. Beware of those who won't guarantee the starts per hour that you need.
But in answer to your question, I know of no standard that states that-just empirical data.
rmw
RE: Specification for Actuator???
Currently actuator requirements exist in end user standards based on their experience in particular applications.
RE: Specification for Actuator???
Some specifications that I have included in the past:
- closing speed
- requirement for a speed controller
- torque of the actuator to be a minimum of 1.5x the max torque to close the valve
- number of starts/hr
- type of actuator
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Specification for Actuator???
For emergency shutdown valves the actuator requires a spring that opposes the pneumatic force to close the valve upon failure of the pneumatic medium. This is available with diaphragm and single acting piston actuators. Double acting actuators and vane actuators lack a force balance means to close a valve for emergency shutdown. Electric motor operated valves and electro-hydraulic actuators lack the force balance to move the valve to a failure position upon loss of the energy force.
Consider position switches to indicate the valve position and perhaps include the position status in the logic to alarm the difference between the command and actual position.
Quick exhaust valves are normally required for valves NPS 24 and larger.
Offshore actuators and nasty plant environments often use a closed pneumatic loop that keeps instrument air on the actuator instead of inhaling the atomospheric air when cycled.
Lots more issues exist. Few industry standards exist.
RE: Specification for Actuator???
RE: Specification for Actuator???
Here you can find the basic features for and actuator.
Visit this page and click in "KTA 2000" there you will down load free the code KTA-3504.
http://www.kta-gs.de/
RE: Specification for Actuator???
Ashereng: You mentioned "torque", but remember, you might have a linear actuator which would require "thrust"
A linear pneumatic piston actuator is very common for globe control valves.
JLSeagull: Recall, you can have an air fail system used in conjunction with a double acting actuator (true--it is not as fail safe as a spring) Also, you can have an electrohydraulic actuator with a spring in it.
it is what has performed well in various applications
RE: Specification for Actuator???
I am aware of a company that uses double acting vane type actuators for critical applications such as emergency shutdown valves on offshore platform riser valves. I regard this as intentional neglegence. (Where did he get his high horse??) Perhaps I should not judge some of these decisions so harshly. Still, I recommend spring return actuators for critical applications.
RE: Specification for Actuator???
I mentioned torque, because that was one example of what I had specified, for a "ON/OFF" valve.
My response to the OP is not exhaustive, nor does it include every possbile answer.
I was trying to ask the original poster to provide more information so that I can give a more useful response.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?
RE: Specification for Actuator???
prEN 15714-1 - 2007 - Industrial valves - Actuators - Part 1_ Terminology and definitions
prEN 15714-2 - 2007 - Industrial valves - Actuators - Part 2_ Electric actuators for industrial valves - Basic requirements
prEN 15714-3 - 2007 - Industrial valves - Actuators - Part 3_ Pneumatic part-turn actuators for industrial valves - Basic requirements
prEN 15714-4 - 2007 - Industrial valves - Actuators - Part 4_ Hydraulic part-turn actuators for industrial valves - Basic requirements
RE: Specification for Actuator???
The Actuator "supply" is the only other information required for calculations, i.e. Air Supply, Electricity Supply, Hydraulic Supply etc.