I need help filling out the record form for regulating valve calibration
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Dear friends: I am seeking help regarding a parameter in the adjustment valve calibration records for petrochemical project handover forms – specifically, di=? I don’t know how to fill it in. I would appreciate advice from those who are experienced in instrumentation engineering. Thank you all!
Valve diameter diameter
I encountered this during work; Di and DN are the same, representing the path length.
It shouldn’t be a numerical value, right? If the valve is DN50, what should di be?
In my company, DN, Di, Da, and Φ all denote the inner diameter, while the outer diameter is denoted by De. Documents from Germany use Da to denote the inner diameter; in domestic documents, DN and Da are used instead. Φ is generally used for holes or threaded pipes, such as the orifice in safety valves, as well as pipes with thread diameters of Φ6, Φ8, and Φ10. Di corresponds to De; the difference between internal and external
Calculation sheet for the differential control valve, it’s on there
Could you send me one? I’m not in design; it’s not on the construction drawings, is it?
Generally, there is a nominal diameter and a seat diameter. The former refers to the size of the flange used to connect the control valve to the pipeline, and it is denoted by DN. The latter represents the diameter of the valve (its flow capacity); sometimes it is indicated as Dn/dn, sometimes as Dg, and sometimes as Di. For example, if the pipeline has a DN100 diameter, the flange used to connect the control valve has a DN80 diameter (i.e., the nominal diameter), while the seat diameter of the control valve is DN50 (with a CV value of 44). This information can usually be found in the instrument data sheets provided by design firms or by the manufacturers themselves. Corresponding question di=50
Generally, there is a nominal diameter and a seat diameter. The former refers to the size of the flange used to connect the control valve to the pipeline, and it is denoted by DN. The latter represents the diameter of the valve (its flow capacity); sometimes it is indicated as Dn/dn, sometimes as Dg, and sometimes as Di. For example, if the pipeline has a DN100 diameter, the flange used to connect the control valve has a DN80 diameter (i.e., the nominal diameter), while the seat diameter of the control valve is DN50 (with a CV value of 44). This information can usually be found in the instrument data sheets provided by design firms or by the manufacturers themselves. Corresponding question di=50