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Our boilers, Utility and CO, have always used purge air blowers with an instrument air backup. I would suggest that you look at a Fireye installation manual for their flame scanners. Their scanners have a Y connection for purge air connection. Or they use a Y fitting to connect the purge air...

The alarms and events are stored on the EPKS server that is supporting the controllers that are the source of the events or alarms. Or if the events are from SCADA points then the servers that are hosting those points. I'm not sure of the exact drive and directory used. good luck

No it is not possible. You can compare existing backups against the current downloaded program and work on editing it until it matches. But you will likely need to wait for a shutdown to do a total download which will require a system halt. Multiple backups on different computers and on...

I believe that you can open a project with Tristation, then download it to the emulator NOT the running system. Then use the compare to downloaded project to open and compare to your other project. You may need a more current version of Tristation such as V4.X. good luck

All major automation vendors have competitive, comparable and similar cost range systems. PLC and DCS features and costs have come together. Your current system supplier, ABB, may have a very suitable upgrade option. Honeywell Experion PKS, Emerson Delta V, Rockwell ControlLogix, etc will all...

Talk to your valve supplier. I am sure that they have SIL rated limit switches even SIL rated proximity switches. Your Guide valve may be a safety valve that has integrated actuator and limit switches and is safety rated as a complete unit. A Google search for "SIL rated limit switches"...

In liquid service you want to keep the impulse line and transmitter filled with the process fluid and for any entraped gas to rise out of the line. Therefore a downward slope and/or a vertical drop to the transmitter which is below the pressure tap. You will have to zero out the head of the...

Start with an instrument index, there should be one in the plant's drawing system. The instrument index will list tag, model number, range, P&ID drawing, line number, etc. You could modernize it into a database or spreadsheet and add additional info or even add links to other files, manuals...

Hi; Because the coil which is powered by the PLC output has no physical or electrical connection to the relay contacts. Unless you connected PLC positive power or ground to the relay contact or common. good luck

Simply move the watchdog timer logic to the start of the program so that it always runs and is not skipped by your voltage check. Or call it before the voltage check is called. good luck

The cost of Exi vs Exd is not just the barriers. Exd requires much more expensive flameproof metal enclosures, cable seals and the use of metal conduit, in North America. "In North America metal conduit must be used for field wiring. In Europe and elsewhere suitably rated cable is connected...

I was involved in a BMS upgrade project for Bailey Net90 systems on 5 boilers with a capacity of 750-800 kpph 900# steam each: from basic engineering through detailed engineering, system selection, FAT, SAT, installation, commissioning and online system support. We did not use MTBF instead we...

Do you mean that you want to increase your plant instrument air pressure from 100 psig or 120 psig to a higher number? >I want to know what are the consequences if the available >instrument air minimum pressure in the plant is increased. >Will it affecte negatively to the valve actuators...

>> How are your local and remote, from DCS or PLC, starts wired? > This is Single Digital Output for Start and Stop. This is > happening only with CDP start. Your communicated or SCADA starts need to be momentary ON's of 5 sec. duration. Configure the variable speed drives to latch in the...

How are your local and remote, from DCS or PLC, starts wired? And what type of logic? I have seen PLC motor start logic that holds the start contacts closed. This is a big mistake and can cause motors to cycle or restart when they should not. ALL the start contacts, manual or automated...

Non GE TMR systems such as those by Triconex or ACS Triplex have true 2oo3 voting for all inputs. Every I/O input has 3 channels that are voted on. All DO's have 4 solid state switches in a H pattern that are voted by A, B, C and A+B channels. All communication is triplicated. Backplane...

In our control strategies for regulatory process control, when we use multiple analogue inputs for a control loop, we may use mid select if we have 3 inputs or a transmitter select with trip to manual on deviation. Once the deviation is fixed or bypassed with the good input selected the loop can...

I am familiar with Experion PKS since we upgraded our Utility Plant from Fisher PROVOX to PKS. Control Builder is for the SCADA part of PKS not the Experion controllers and I/O. So perhaps the TDC PLC interface boxes are publishing TDC I/O as Modbus addresses for the Experion SCADA? Are...

At our plant our standard for control wiring is 14 AWG because the current load can be much higher than current loops. Lately foolish bean counters have been using 16 or 18 ga wire for 24VDC control wiring. Even with low current solenoids there can be problems. For current loops we used 20...

Possibly the system is filling up by gravity when it is off then it needs those cycles to clear. You need to route your tubing to minimize holdup or gravity feeding. Your pump is probably not a precision volume to stroke pump like a chemical injection or peristaltic pump. A peristaltic pump...