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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...

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...

We have a problem with some Turbine stop valves that after some weeks or months staying open they fail to close at the original speed. Is there any rule regaring exercising the valve daily or weekly? Thanks

Hi all We need to use small fuses (1 to 6 Amp, 24 VDC) in Class I Zone 2 (Div. 2) hasardus area. After doing some research, found out that ceramic fuses conseder to be "None Sparking" and can be consider as fulfilling the NEC requirements. Wondered if anyone have more solid argument or...

Hello All I'm looking for temperature transmitter to be install at a PT-100 RTD head, which can be mount outside at -45°C. All the transmitters I found ar for -40°C (or F) amb. temperature and I was wondering if there is one for the -45°C I need. Thanks to all

Can anyone post an advice regarding good and simple device (MODEM?) to be connect to the Computer USB port and can read HART signals from transmitters and valve positioners. Program to run it is the "PACTware" see http://www.pactware.com/english/index.htm or just http://www.pactware.com (in...

To All Hope you will find it interesting to know. I contacted a small company with great idea. They developed a small sensor, based on heating, cooling and temp. measuring (all in one sensor) that can calculate in two phase flow (Steam and water or gas - liquid systems like air conditioning...

To All Hope you will find it interesting to know. I contacted a small company with great idea. They developed a small sensor, based on heating, cooling and temp. measuring (all in one sensor) that can calculate in two phase flow (Steam and water or gas - liquid systems like air conditioning...

I'm planning to install new 2.5 MVA, 13.8/0.48 KV transformer. According to the NEC 240-21 Para. 3, the maximum tape condactors total length (Primery and secondary condactors) is no more then 25 ft. The Transformer equipped with oil immersed fuses at the primery (13.8KV). Does anyone have...

We are desing 3 orifices one after the other to reduce steam pressure. The question is: when calculating the pressure drop on the second orifice, do we need to add the recovery pressure of the first one in order to estimate the inlet pressure to the second orifice? same with the thierd...

Hi to All We have letters assigned for the common transmitters (Pressure, Level etc) at the P&ID diagrams, But we are arguing regarding the letters we need to use for Gas Detectors (4-20 MA output) and flame detectors (Switch output). Are they at the Analayzers Catedory? It does not look...

Any one have good source for renting portable High Speed data logger (2 to 6 chanals). General source for renting measuring instruments? (At the US / Canada) Thanks to all

Hi to all We installed a 2 MW turbine and Generator connected to the grid (6.4 KV, 60Hz). While performing a 100% load dump test, the max. Turbine speed was 21% over the normal speed (1,800 rpm). We have certified test reports from the generator and the turbine manufacturers for 130% speed...

Hi All Does any one know if there are any requirments for certification or spacial installation when installing RTD and Thermocuple installed in Class II (Zone 2) hazardous area Regards to all

For all the Experts I need to recommand the best economical way to measure Saturated Steam Mass flow at a 36” (!!!) pipe. According to the contract, Accuracy must be 2% (Mass Flow). The Only Option I know is the Rosemount Mass Probar Flow Transmitter with integral Temperature and Abs...

I'm usually use the US Area Clasification as per NEC, the NFPA and API for area classification (Means for determin how many feets (or Meters) from the hazarduos source Div. 1 and Div. 2 are). Can any one point at the same instruction for the European equivalent? thanks ilan

The regular control loop aims to keep the process variable nearby a desired set point by changing the controlled variable (the output) as a function of the error (difference between process variable and set point). With the trial and error approach, the control system aims to "improve&quot...

Wondered if there is a way to measure two phase flow (steam and water) in a 20" pipe? thanks to all.

I got a new motor from a respectable manufacturer with RTD's for measure and protect the windings from Over-temperature. I was surprised to see that the RTD’s are three wires, with the compensation wire connected to the ground and does not have any terminal. Wondered: is it normal to measure...