If the Limit switches are Ex d Certified, you do not need barriers unless they are in Zone 0.
With NAMUR type, I assume they are proximitor types, need 24 Vdc supply and have none- isolated output. Check the drawing and instructions you got with the actuator or take the Topwork P.N and look...
Wow. I used those kind of instruments (Pneumatic transmitters) early Eighties. Since then we moved to the Electronic output displacer, Then to DP transmitter and now we are using Radar transmitters.
You have to follow the instructions at...
As far as I know, large generators (over 2 MW) are certified for Zone 2 (Class I Div. 2) only. No Generators for Zone 1 or Zone 0.
I’m wondering how the code deal with generator attached to a Gas Turbine inside a close room. The Gas turbine fed by natural (or other flammable gas) and the...
As far as I know, large generators (over 2 MW) are certified for Zone 2 (Class I Div. 2) only. No Generators for Zone 1 or Zone 0.
I’m wondering how the code deal with generator attached to a Gas Turbine inside a close room. The Gas turbine fed by natural (or other flammable gas) and the...
Geothermal steam are not like regular industreal steam. They usully have gases flowing with them, chemicals and other stuff mother earth is contribute to the mixture.
Before attending to direct the steam into the turbine you have to check:
1. How much of NCG (None Condensible Gases) there are...
Have a question to the experiance guys:
I’m trying to measure the temperature in an area, where the Relative Humidity is about 70%, and the air is flowing carry a lot of water drops.
When inserting a regular RTD, the reading I got are actually the wet bulb temperature of the air, as...
Assume the vender need the design pressure drop accross the valve.
usually, pressure drop will be at 1 to 100 psi, when for liquid service. if the pump deliver more then 100 psi, and the liquid is flowing into an atmospheric tank (no backpressure, you might need to add an Orifice to take...
Water at 552°F will flash (turn into steam) when pressure is lower then 1050 psi Abs. Means you are not measuring water any more but water with pockets of steam. It might be the reason for the problem.
In order to prevent it - it will be halpfull to keep the pressure a bit higher then the...
Must use steam traps (as mensioned) and must have safety rilief valve at the tank or a large vent that will allow all the vapors to release from the tank with only small overpressure.
You can specify the Yokogawa transmitters with Hart (and NOT BRAIN) system and get read of those problems in the future. For HART there are several companies that make the comunicators, (not only Rosemount, 6,000$ Hart comunicator ) but like SMAR have adupter and software for PALM Piolt...
Need to have all the numbers put together - flow and pressure drop across the said control valve, and then select and calculate the needed valve. It might be that more then one valve is needed, and might need an Orifice in the valve line. If you do not have anyone in the company that...
Weegie
think that instructions and guidelines are not the main key to get the job done. It more for satisfy management and have the paperwork done. In order to have the contractor job done professionally and for getting good control system at the end, paper work is not the key parameter but...
as mensioned, the liquid is no classifide as flammable so no EX protection is needed for the electrical instruments involved. See what is done at a regular gasolin station - pumps are not EX and all other instruments.
We build systems that uses thermal oil in compressed natural gas stations...
Stop at Ormat.com see the list of projects there. Do not do retrofits but designing the exact unit that produce the maximum power from the given heatsource.
R-134 is a Freon right? do not think you want to use it or base a unit on it
I do a lot of specs and data sheets too, although it is not my only duty. As so, I do not consider calculating sizing and creating data sheet for a control valve to be the same as data sheet for a Pressure transmitter.
I do agree control valve calculation and data sheet needs 5 - 10 hrs...
Think the DP transmitter will work on "real" liquid - not on a stiky crude. with that material you will not get the true hight of the liquid translated into pressure for the transmitter to read. Another problem is with the temperature, as diferent parts of the tank has different temperature...
Use Static Mixer. Consult with the process / piping guys about it - has to be at the right size and the right construction material to perform as it should.
No "Standard" for less then 4 ma. For valves, nothing less then 4 ma, but you can get more information from the positioner using HART or other inteligent communication if the positioner equipped with the said feature.
For transmitters, usually when 4 or 3 wires transmitters there are a...
Assume you already solved the problem, but would like to have my inputs / options:
1. One possibility is the float did ot fall down but was stuck there while the level was low.
2. The temperature or pressure was too high and the float shape was changed and stuck.
3. Fluid specific gravity...
