New guy needs valve nonemclature 2

[wstlur]

I am only three years in the field, geothermal power. I am wondering if valve numerical ID's at other plants are similar to ours; ie. Our High Pressure Separator Level Control Valve is LCV 25, dump valve is LCV 26, pressure control valve is PCV 85. Are these industry standards or site specific. Yes I could, and will if need be, ask my coworkers. But, as a worm, it is nice to "know" something every now and then.
If these are standards; Is there somewhere they are documented?
Whistler

 

[rmw]

I can't speak for geothermal, and would say that it is largely dependent if there is some commonality in the OEM's or the AE's that build those type plants.

However, your question is not unreasonable, as in the super critical plants of 20-30 years ago there was commonality between the valve nomenclature for the system valves. One manufacturer used a system that was numbers, (e.g. LV-58, PV-201, etc) and another used one that was "the alphabet valves." I forget what the third one used, and I'm not going to get up and go look it up just now.

Maybe someone from your industry can chime in as to what your industry has done.

rmw

 

[1969grad]

The letters like LCV and PSV are ISA nominclature and pretty common. The numbers I do not recognize. Perhaps they refer back to a piping spec which has more definition.

 

[pipingdesigner]

As 1969grad said :
"The letters like LCV and PSV are ISA nominclature and pretty common". Agreed.

The numbers are more than likely nothing more than numeric identifiers, each control valve / instrument can be identified for spare parts, calibration schedules etc.



pipingdesigner

http://www.pipingdesigners.com

 

[wstlur]

Thanks guys that is what I thought. Would be nice if all were similarly coded but there are many plants to try to get in line and whos will we use.
One more reason the UN will never get the job done.

 

[Ashereng]

Hi wstlur,

As a very general statement, instrument/valve tagging tends to follow ISA, with a healthy dose of site specific preferences.

For example, you spoke of a LCV 25 for a level control valve. Other variations of this may be LV 25 (the assumption being that a Level Valve is understood to be controlling the level).

The numeric portion is more site specific. For example, the level control valve for tank TK-101 is often tagged as LCV 101. The number goes with the equipment. Other sites will use a 4 digit system, in case there are 2 level control valves (e.g. multiphase separators will use LCV 1011 and LCV 1012).

I guess what I am saying is that instrument tagging just varies, and sometimes, there really isn't a reason so much as it is an established practice.

Hope this helps.

 

[Sircrashalot]

For the offshore rigs, valves are usually tagged with the ISA Valve type, system identifier and valve specific 4 digit number. Some platforms have the system identifier before the valve type, others imediately after - eg 56-PSV-1234 or PSV-561234.

It will depend on the specific configuration of each rig that will determine the valve tag number. Also, if by chance two rigs have the same valve tag, they are likely very different valves.

Andy

 

[jsummerfield]

1969grad and piping designer get a star. ISA 5.1 includes the Piping and Instrument Diagram symbols and the identification letters. The loop number is largely client preference. A process unit may be cloned to use the same tag numbers. Often a plant or unit may use prefix or suffix associated with the devices. PCV suggets a self container pressure control valve or regulator. PV is normally used it the actuator receives a signal from a controller. LCV could suggest that a float operates a lever that opens and closes a valve directly. LV would normally be used if a level transmitter and controller generate the output signal to the valve.

The first alph character pertains to the measured variable. A analysis, F flow, L level, P pressure, T temperature and others. Sometimes there is a modifier like PDT for pressure differential transmitter. Subsequent letters pertain to indication functions, output functions, etc. The V in LV pertains to valve, T for transmitter. Other examples include C for control, A for alarm, S for switch and a confusing on Y for relay or other computing elements or converters, etc. Additional letters often modify these letters such as LAHH for level alarm high-high at the shutdown setting that is set higher than the LAH that pre-alarms the high level. LC is for level controller; or LIC for level indicating controller. Many people use LIT for level indicating transmitter with a local indication.

ISA
Attn: Standards Department
67 Alexander Drive
P.O. Box 12277
Research Triangle Park, NC 27709


John