Panel operator

A chemical reactor, being started, was filled with the reaction mixture from another reactor which was alic.uly on line. The panel operator increased the flow of fresh feed while watching an eye level temperature recorder He intended to start cooling water flow to the reactor when the temperature began to rise, but did not because the tempe.r.j, ure recorder was faulty, thus a runaway reaction. 

A reactor was being started up. It was filled with reaction mixture from another reactor, which was already on line, and the panel operator started to add fresh feed, gradually increasing the flow while he watehed the temperature on a recorder conveniently situated at eye level. He intended to start a flow of cooling water to the reaction cooler as soon as the temperature started to rise—the usual method. 

The evaluation of the safety of a new excipient as a food additive could be accomplished by the submission of a food additive petition to the United Nations expert panel operating under the auspices of the FAO and the World Health Organization known as the JECFA. A JECFA review could serve as a separate independent safety review to support the new excipient for potential use in drug products. Alternatively, the safety of a new excipient could be evaluated through the food additive petition processes, as currently in practice both in the United States and the EU, assuming that the new excipient can be demonstrated to have a technological function as a food additive. 

On 1 September 1959, the Joint Army-Navy-Air Force Thermochemical Panel was formed under the sponsorship of the Bureau of Naval Weapons, Department of the Navy Office, Chief of Ordinance, Department of the Army Air Research and Development Command, Department of the Air Force and the Advanced Research Projects Agency, Department of Defense. The panel operated in accordance with the Rules of Operations of Solid Propellant Panels as adopted by representatives of the above offices on 1 September 1959. 

There are a total of five panel operators who manage the central refinery control room. Outside personnel carry out solely supervisory tasks. 

Panel operators handle a total of 40,000 individual data points visualized in four control groups containing four display units in each case, and an extra group containing five display units. Foxboro supplied the control system. The number of units attended to by each individual panel operator is obviously related to the total number of control loops involved. At the same time, consideration also had to be given to the physical boundaries of the individual units to facilitate effective communication with outside operators. 

Keep in touch closely with the plant superintendent, shift supervisor, panel operator, and upstream units control rooms. Quickly question any decisions that may affect the test. 

The lights in the hood should be shielded from the hood body in, as a minimum, a vapor-proof enclosure. These can also be selected as explosion-proof units should the usage include substantial amounts of very flammable materials. In fact, if a large portion of the work in the hood is expected to involve very volatile flammable materials, the hood should be designed completely as an explosion-proof unit. In any case, all electrical outlets and switches should be located outside of the hood on the vertical fascia panels. Similarly, utilities should be provided by remotely controlled valves in the side panels operated by handles outside the hood. The connections to the utilities inside the hood must be chemically resistant and should be clearly identifiable as to the utility provided. 

Since desorption is a thermally activated process [18], the outgassing rates increase as the temperature increases. The outgassing contribution has therefore to be carefully evaluated in all those applications where the vacuum panels operate continuously at temperatures higher than room temperature, e.g., 60-80 C, or have to withstand high temperature peaks, for example 100 °C, even for a relatively short period of time. Examples of such applications are presented and discussed in Section 4.6. 

Vending machines are quite a demanding application for VIP, since the panel operating temperature is cycled between room temperature and 60-70 °C and the lifetime is 5 years. As already discussed, the high temperature promotes higher diffusion and outgassing rates and provides additional mechanical stress to the envelope. 

A second mold-making machine had the same layout, but the molds exited on that conveyor in an opposite direction. The control panel was on the left of the table. The rotary switch on each control panel operated the same and had the same labels. Rotating right meant the table moved down. Rotating left meant the table moved up. 

The main features of the control system of the plant are reported here. A dedicated programmable logic controller (PLC) handles both regulation loops and an alarms-interlocks system. If any process condition exceeds the design values, a trip system is activated and an interlock sequence restores a safe state. The control panel operator monitors alarm indicators and may take appropriate action when needed to avoid a plant shut-down. 

A comprehensive operator training program was set-up after the Factory Acceptance Test of the Honeywell Experion PKS system and prior to the start-up of the plant. Three parallel simulators, each covering a section of the plant, were installed. All panel operators and their backups were formally trained by 8 trainers, over a period of 10 months and in two shifts. 

Enhanced Operator visualization graphics are in the process of development, wherein the panel operator will be provided guidance message with respect to the temperature excursion and the possible controls that need to be taken for bringing the stream temperature inside the operating envelope. As a proactive approach and with respect to the down time experienced due to the failed BAHX, a spare set of BAHX is being planned to be purchased, which will be common for all the assets. 

S) 1 1 S> 1 S( SI Switch panel operator, instrumentation, measuring instruments... 

Left to his own, the shift worker operating the FCCU control panel often chooses the simplest method to hold riser temperature constant. On many units the control panel operator has discovered that changing the... 

The lower group of controls on the panel operate the internal variable standards. The right dial is calibrated directly in ohms resistance, this dial is marked R. The lever switches immediately above the dial are the resistance adder switches. When the adder svritches are in the 0 position they are inactive. When the switches are in other positions the values indicated a3 e added to the reading of the R dial to obtain the resistance of the load. The two adder switches may be used in any combination of settings to extend the resistance range of the bridge to 1000 ohms. 

Panel operator The operator assigned to control the unit. This individual will work 8- to 12-hour shifts and is normally regarded as the most important person on a process unit at any given time. Usually not an engineer, but an experienced plant operator. 

Control valves have a tendency to stick. Even though the valve is shown to be moving on the panel screen, it may not be moving in the field. This is easy to check. The stem of the valve should be shiny and bright. This indicates that the stem has been traveling up and down recently. If the stem is covered with dirt, ask the panel operator to "stroke" the valve. This means he will fully open the valve and then fully close the valve. The valve stem has a position indicator. You can observe in the field if the valve opens and closes to its full extent. 

For many (but not all) control valves, you can tell if air pressure is supposed to open or close the valve. If the tubing to the diaphragm is on the top, as shown in Fig. 38.4, then the air pressure is usually (but not always) going to close the valve. When in doubt, ask the panel operator to move the valve. Touch the stem with your gloved finger and see what happens to the air pressure of the output dial. 

Operating with a control valve bypass open is not permitted by many operating companies. In theory, I agree that control valve bypasses should be kept closed. In practice, I frequently have opened bypasses. For example, we have a fired heater that is limited by the unit charge pump. Opening the bypasses around the heater pass control valves seems reasonable and safe. But suppose there is a leak in a heater tube. The panel operator closes the pass control valve remotely to stop the fire, but the flow continues through the bypass valve. The reader can imagine how I became so smart on this subject. 

Computer control has transformed the design of control systems in the process industry. Yet the panel operator must still be trained to run the plant manually, using 1920s control loops when the computer control falters, and even then must also be well practiced at manual control under daily normal circumstances in order to cope with plant ujjsets. 

Various types of ship-control systems are used in submarines. The ship-control system used in the Seawolf submarine represents the state of the art for such sysfems. This sysfem incorporates various features, including a fault-tolerant computer, automatic modes of control for steering, and flat-panel operator displays [23]. High-speed data buses permit the ship control to interface effectively with the data distrihution system, gyrocompass inertial sensors, and the combat system. Furthermore, hardware redundancy and performance-monitoring software permit the system to function after experiencing malfunctions of ship sensors, control electronics, and the actuation systems it controls. 

The description of the system should include the locations (e.g. plant grid and elevation, room number or area number) of sensors, racks, cabinets, panels, operator controls and operator displays as well as of facilities for manual adjustment and system testing. 

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