Hi, I am trying to figure out how many accesses are needed in operation ad maintenance platforms on top and around fuel oil tanks. Cant seem to find any specifics in NFPA or OSHA requirements. I wonder if anyone can point me in the right direction.
thanks,
Hi,
Our EPC contractor installed atricentric butterfly valve as a control valve, after about less than a year it is showing signs of poor regulation. Sometimes the valve won't respond or responds late. We have changed the positioner but that seems to be ok.
I said from the beginning that this...
Hi,
I have a Venturi tube installed on a superheated steam line. In order to calcula the mass flow I have a couple of questions.
1. does the transmitter have to extract the square root or linear and then which formula would need to be applied to read mass flow and not volumetric flow?
thanks
Hi,
I am told by our feedwater valve supplier that the maximum allowable dp across this particular valve is 3,4 bar. During operation we actually need to have a dp above 3,4 bar in order to maintain level in the boiler. In fact we operate at around with a dp of around 7 bar.
What would imply...
I need you advice regarding the use of the expansion tank in a thermosolar power plant.
We are using the expansion tank as a gas eliminator, i.e we recirculate all the HTF through the tank so as to eliminate possible accumulated gases. The thing is that speaking to a colleague from another...
Hi,
In our solar power plant where we have a 50MW ST we need minimum 30ºC superheat in HP an 50ºC in LP.
Our current startup procedure is as follows.
* Sun comes up
* Start up SG
* open HP bypass manually 5%
* LP remains closed
* LP vent open
We then wait for conditions for around 90...
I have a calculation based on enthalpy so as to attemperate steam to a turbine. The calculation has the following formula which I can´t understand.
Flow = m x(Enthalpy (HPT)- Enthalpy (CRH) /Enthalpy (CRH) - 764.8) kg/s
Enthalpy (HPT) = High pressure turbine. Enthalpy calculated from presssure...
Hi,
I am trying to make sure that our control room is a tidy and ordered as possible. For that I would like to set up a few basic rules, such as no mobiles phones, restricted access etc.
I was wondering if anyone has a set of rules from other control rooms.
thanks
Hi,
I have a problem with the levels in the LP and HP hetaers of our solar plant. When there is a high level on the LP heaters the turbine closes its extraction and it trips the turbine. The heaters have 3 wave guided level transmitters from VEGA. These High levels are usually sudden peaks and...
Hi,
I am having a problem keeping my BFW pumps from having to stop due to low NPSHR.
50MW solar powered plant. 4 BFW pumps, 3 normally maintaining level in Steam generator drum, 1 stdby.
The pumps NPSHR at 100% (3300 rpm) is 3 m. We are having great troubles in having a NPSHA above 3 at high...
Hi,
I have the following problem. I am suppose to receive a 4-20 mA signal from a system called TELEFLO DIVA supplied by Air Liquide.
Problem arises that when i connect the two wires to our plc input card (configured as active) we read nothing. However wheni connect a 4-20 mA generator (as...
Hi,
I have the following problem. We have a 2" carbon steel pipe for caustic soda (50%)for which our customer(Refinery)requires a PWHT. The question is whether or not it is techically necessary to carry out this test since it is not required by ASME B31.3. We believe that the pipe will not...
Hi,
Can anyone tell me if the holes on the thermowell attached are correct. They happen to be oval shaped and my supplier says it is not a fault and that it is caused by the welding process.
