Search results

Ujjal Naskar One simple question... How long have the boilers been in operation? The reason I asked about the Intensity-meters and now age, follows: Since this is a Tangentially-Fired furnace, and unless the swirling ball of flame is exactly centered, the intensity-meter for each flame-detector...

Responding to CSA words of Wisdoom... Reur "off-Line" remark! I only reply back to the Forum if enough information is provided by the Thread-Starter to reach a solution to their problem ! In fact if no solution is found I suggest "they" report status back to the Forum... just ask anyone! Have a...

Ujjal Naska 3) Is there a "Pressure-Drop" signal/alarm at all?

Ujjal Naskar You said "Both boiler are designed by the same manufacturer." Without discussion revealing data there never will be a solution. So then, let's start with... 1) What did the Mfg say! 2) What did the your instrumentation reveal other than "Furnace-Pressure dropped"? Can you confirm...

Ujjal Naskar Please provide answers to the same questions asked of the original Thread Starter? Regards, Phil Corso

Mehboob I misread your comments. Perhaps you can utilize my procedural tips to find the cause of the false-alarms? Regards, Phil

Mehboob It is very unlikely that false tripping is caused by the Input devices, i.e., the 27 or 50, because the probability of 2 input-devices failing simultaneously is extremely low. I suggest you address the BF output-action device or circuit, especially the timer, if so equipped...

Mehboob 1) Regarding the Gen'r "CB-Failed-To-Operate" Function, can you provide the 27 (Voltage-Relay) and 50 (Overcurrent-Relay) Logic diagram? 2) Do you also have a Gen'r "CB-Inadvertently-Operated" Function? Regards, Phil Corso

Vladimir36 Sorry, but I'm in CSA's corner on this post. Driving an Induction-Motor to a speed faster than its nominal rating turns it into an Asynchronous or Induction-Generator. That means, it must be driven to a speed equal to its rated frequency (2-pole, 60 Hz in your case) plus a value equal...

As promised the PFC illustration is attached. In this case the PFC it's just a capacitor. Simply put, it's Capacitive-Reactance offsets the Inductive-Reactance supplied by the Utility to its customer! The result is an improved power-factor, so that any PF cost-penalty imposed by the utility is...

For those interested in a simple explanation of Power Factor, which I use for my students: o A quarterback can throw a short-pass like a bullet, on a straight line to the receiver. o But for long distances he must throw it in an arc. o "Real" Power is the bullet. o "Reactive" Power is the height...

Aljude95 It's an age-old question, i.e., redundancy for Safety, Availability, or Efficiency! 1) Operating all four (N) at equal load, results in best availability. 2) Operating 3 with best eff'y, but 4th at small load decreases efficiency! 3) Then there is the question about load... how...

alwaysahobbyist 1) Can you provide some info regarding appearance of the problem since it was commissioned ? 2) Do you have a print out of the Surge and Safety line curves, i.e., mass Flow-rate vs Bar? Regards, Phil Corso

cl302i (makes you sound like a Robot) Your comment about "Braking Action" is correct. My physical representation is that of two 3-ph motors, one big, the other small, connected on the same drive shaft ! The big one is wired properly for direction, the small one is wired in reverse! I'm also...

cl302i... 1) Did you know the the diameter and of both pump and motor are in the order of inches, while their lengths in 10's of feet? 2) The cable is not symmetrical, that is, their core to core separations are not equidistant ! 3) The core distances to "ground" are also asymmetrical ! 4) The...

cl203i... The simple answer is yes! But it's normal, especially, if the liquid is oil. Unfortunately, it's virtually impossible to eliminate (but can be reduced somewhat) and it should be considered when sizing the pump-motor! But, the most important factor is voltage at the motor! If you would...

Controlsguy25! I apologize for offending you! Phil

Carlos Duarte, ControlsGuy25 Aren't you comparing apples to oranges. Since you are discussing transient stability, and not Steady-State or Dynamic-Stability, recovery capability for the old fuel-Generator is 7 MVA per second, while that of the GTG is 15.7 MVA per second ? Regards, Phil Corso

Niazbibiyana... You're showing your age! No sweat, I'm probably decades older. However I've graduated from being "old" to being an "Elder"!:giggle: I'm sure you know that for an L.O.E. condition, the synch-gen'r becomes an induction-gen'r and the reactive energy flowing toward the load...

Abby, A schematic would also be helpful Regards, Phil Corso