Temperature monitoring tank

Storage tanks should have temperature monitoring with alarms to detect the onset of reactions. The design should comply with all appHcable industry, federal, and local codes for a class IB flammable Hquid. The storage temperature should be below 37.8°C. Storage should be under an atmosphere of dry nitrogen and should vent vapors from the tank to a scmbber or flare. 

In the basic system described above, if the temperature drops below the pasteurisation temperature or the flowrate exceeds that for the correct holding time there is no other choice than to shut down the process and to clean and resterilise the equipment before production can be restarted. The consequences of this may be limited by diverting the flow of insufficiently pasteurised product back to the balance tank forward flow may be resumed once correct conditions are restored. The divert valve should be placed sufficiently downstream of the temperature monitoring probe that the system response time (probe, controller and valve) is less than the time taken for the unpasteurised product to reach the valve. 

The ATG system enabled an operator to monitor levels, temperatures, and tank valve positions and to initiate the remote operation of valves using the ATG system from the control room. The ATG contained a large database, which recorded levels, temperatures, alarms, value positions, and other related historic support information. The system was designed so that the alarm/trip instrmnerrt signals were also sent to another area, which was also supposed to shut valves to preverrt the overflow. 

A B Auxiliary Recorders/Reactm Tank Temperature Monitor Essential Equipment Monitoring (EEM)... 

Reactor Tank Temperature Monitor (except on -40-foot-eIevation and in the CCR)... 

Normally, tank levels were controlled from a control room using an automatic tank gauging (ATG) systan. A level gauge measured the liquid level. The operator in the control room used the ATG systan to monitor levels, temperatures and tank valve positions, and to initiate the remote operation of valves. 

The optical properties of the cholesteric phase provide a useful mechanism for a temperature sensor. Such devices may be found in pet stores (e.g., fish tank thermometers) or the hardware store (e.g., home temperature monitors) and are extremely cheap and relatively disposable. In a... 

This subsection concerns the evaluation of the following mechanical and electrical equipment (including the electrical components associated with pumps and valves) (1) the PWS, including the Septifoil system (2) the SSS (3) the CWS (4) the MRS (5) the CWRDS (6) the diesel generator system (7) equipment for automatic actuation of the.SSS (8) filter, compartment latches and chocks and (9) instrumentation required for monitoring tank level, pump flow indicators, and bulk moderator temperature following a DBE. 

This method involves the soaking of test specimens in a tank of deionized water at 60°C. Specimens are allowed to soak for periods up to 100—1000 h in water at this temperature. At the end of the soak period, the specimens are removed and placed in a container of water also at 60° C. The container is then placed in the test chamber of a universal tensile-testing machine. The chamber is also kept at 60°C. The test specimens are then removed, one at a time, from the water and placed in the grips of the test machine. A thermocouple is attached to the specimen and the temperature monitored. When the... 

Fire and uncontroUed polymerization are a concern in the handling of chloroprene monomer. The refined monomer is ordinarily stored refrigerated under nitrogen and inhibited. This is supported by routine monitoring for polymer formation and vessel temperature. Tanks and polymerization vessels are equipped for emergency inhibitor addition. Formalized process hazard studies, which look beyond the plant fence to potential for community involvement, are routine for most chemical processes. 

The styrene storage tanks will be equipped with level indicators and a high-level alarm and switch. If the level in the tanks becomes too high, the feed will automatically be switched to one of the other tanks. The temperature of the styrene will be monitored. If the temperature should exceed 86°F, the operator will be alerted by an alarm bell. He can then take any action deemed appropriate. 

There are several technologies of linear heat detectors, most designed to monitor air temperature and a few that detect radiant heat. This type of detection is wire or plastic tubing and can be used where other types of detectors are difficult to install. Generally, they are used to supplement other forms of detection in difficult areas, such as heavily congested areas, rim area of floating roof tanks, on pumps, etc. Linear types can be pneumatic, electrical, or optical. Electrical linear heat detectors come in three types that ... 

In the catalyst preparation area where the fire occurred, aluminum alkyl and isopentane are mixed in a batch blending operation in three 8000-gallon kettles. The flow rates of components are regulated by an operator at the control room. Temperature, pressure, and liquid level within the kettles are monitored by the control room operator. The formulated catalyst is stored in four 12,000-gallon vertical storage tanks within this process unit. Aluminum alkyl is a pyrophoric material and isopentane is extremely flammable. Each vessel was insulated and equipped with a relief valve sized for external fire. 

For the semi-batch stirred tank reactor, the model was based on the following assumptions the reactor is well agitated, so no concentration differences appear in the bulk of the liquid gas-liquid and liquid-solid mass transfer resistances can prevail and finally, the liquid phase is in batch, while hydrogen is continuously fed into the reactor. The hydrogen pressure is maintained constant. The liquid and gas volumes inside the reactor vessel can be regarded as constant, since the changes of the fluid properties due to reaction are minor. The total pressure of the gas phase (P) as well as the reactor temperature were continuously monitored and stored on a PC. The partial pressure of hydrogen (pnz) was calculated from the vapour pressure of the solvent (pvp) obtained from Antoine s equation (pvpo) and Raoult s law ... 

Temperature indicators are used to monitor the temperature continuously. The temperature requirement for the WFI tank is >85°C and for the water distribution system >80°C. Conductivity... 

---