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dear experts A junior colleague asked me about valve actuator selection criteria and i am trying to support her with a reasonable answer.She asked me what are the key criteria to select different types of actuator for process valves although she and me deemed in most occasions spring return...

Sorry the sentense is as follows: "if the displacement is greater than 1cubic inch or if the differential of the instrument is low compared wuth the column displacement, regular condense pots should be used."

Good guys! I came cross to this sentens in API551 n sec 2.3.1.2.3 but displacement is unfamiliar for me,it should be a quntity of volume as it uses cubic inch for its dimension.I would like ask you to give me a clue. Thanks Masoud

I am in the middel of reading api 551, process measurement and instrumentation.there some unclear points I faced with.I needed some helps in this regard. For example in sec. 2.2.2 the last sentense is unclear.

Hi all, I am looking for place to share my quesions on API .Would you please guide mthe right place.I need experts how are familiar with API and can help me by right interpertations. Masoud

According to this standard there are six more known primary elements for head type flow instruments. As l saw mostly orifice plates are used in this regard. I want to know about others usage situations esp in oil and gas facillities.

Another quesion, Refer to sec 2.2.7 what are typical applications for purged impulse lines in oil and gas treatment facilities?

In sec 2.2.3 rolling platforms are refered has anybody such practise, i am mean has an example of this application?

dear all, I am reading this standard.I have a question on that.in sec 2.2.2 the third and last sentense are not clear for me please help me by clearifying their meaning. Thanks in advance, Masoud