Alarms temperature indication

A typical lubrication oil system is shown in Figure 15-1. Oil is stored in a reservoir to feed the pumps and is then cooled, filtered, distributed to the end users, and returned to the reservoir. The reservoir can be heated for startup purposes and is provided with local temperature indication, a high-tempera-ture alarm and high/low level alarm in the control room, a sight glass, and a controlled dry nitrogen purge blanket to minimize moisture intake. 

Temperature indicator (with high-temperature alarm if deemed necessary). 

The colors purple, brown, black, and gray have not been assigned a safety connotation. Specific color codes are also employed in the identification of alarms panel indicators, piping, compressed gas cylinders, electrical wiring, fire sprinkler temperature ratings, etc. Although these sometimes do not correspond with similar meanings. 

Dry-type transformers are typically installed indoors and include ventilated, sealed, or gas filled, totally enclosed non-ventilated, and cast coil types. Cast coil transformers are the most expensive and they have the highest overload capability. Transformers should be sized based on their air to air (AA) rating. Provisions for future automatic fans that will provide a higher force air (FA) rating and an alarm that indicates when the fans are operating due to the temperature within the transformer should be provided. 

They may be built lo hold more than one sterilizer load, but if all loads are not to be removed at the same time some alarm or device should control the length of time that access doors are left open. This should be minimal. Precon dttioning chambers should be of sufficient size to allow free circulation of air and moisture to all parts of the loads. The criteria for temperature and humidity specified for preconditioning rooms should be identical or very close to those obtaining in the sterilizer in practice that means something close to those found in a sauna but less pleasant. The finish of preconditioning rooms should be robust enough lo tolerate these conditions. Forced air circulation is necessary to the attainment of uniform conditions fans should be equipped with alarms to indicate any failure. 

A reverse flow of sulphur from the combustion furnace to the melters cannot happen through the spray gun even when the sulphur pumps trip (in this case, temperatures will drop in all units. It is indicated by alarm for sulphur pump and by temperature indicators). 

Lubricating oil is pumped from a reservoir to the compressor and then runs down from the machine to the tank. The tank should have level and temperature indication and a low-level alarm. The pumped oil is cooled and filtered before going to the compressors. Dual filters rated at about 10 p.m are used, and a standby pump is provided. The oil must be dry, and so its reservoir is frequently blanketed with nitrogen. Some of the alarms on the oil system will be supplemented by shutdown switches in case operator action fails to prevent further departure from the control point. 

Sufficient Information should be displayed in the control room to permit the control room operator to take action in the event of an upset or to identify the problem for direct attention of the outside operator. Typical information required includes alarms, variable indication, critical running lights, etc. Location of controllers (local or panel) should be determined by how often the set point of that controller requires attention. Prime candidates for local control are non-critlcal level controllers (condensate flash tanks, surge tanks), tank pressure controllers, non-critical heater temperature controllers, etc. Local indication should be provided for evaluation by the outside operator. 

Associated instrumentation is provided for each train to assure adequate control and monitoring of the EFW system. Temperature indicators (TI s) are located between the flow control and motor-operated isolation valves (MOV s). These TI s provide a direct indication of the fluid temperature and alarm on high fluid temperature in the EFW system downstream of the EFW pumps. 

The Disassembfy Basin temperature indication and alarm systems, and associated electric power... 

Maximum temperature rise permitted above ambient temperature in summer at the location where the transformer will be installed.and whether temperature indicator is provided with alarm for high oil temperature. 

Steering. The alarm levels are both for the lower level. The third example (TIRAS +/++) represents temperature indication, registration, alarm, and steering, as in a thermocouple, with both alarms at the upper level. 

The pressure of the steam used for heating sulphur must be rigorously controlled. High and low-pressure alarms should be installed in the feed lines, together with temperature indication. 

Alarm typewriter indication showed self-powered neutron detectors responding to high temperature down to 4 level of the core. 90% of the core exit thermocouples >700T. 

Endurance Burn Under certain cou(itious, a successfully arrested flame may stabilize on the unprotected side of an arrester element. Should this condition not be corrected, the flame will eventually penetrate the arrester as the channels become hot. An endurance burn time can be determined by testing, which specifies that the arrester has withstood a stabilized flame without penetration for a given period. The test should address either the actual or worst-case geometry, since heat transfer to the element will depend on whether the flame stabilizes on the top, bottom, or horizontal face. In general, the endurance burn time identified by test should not be regarded as an accurate measure of the time available to take remedial action, since test conditions will not necessarily approximate the worst possible practical case. Temperature sensors may be incorporated at the arrester to indicate a stabilized flame condition and either alarm or initiate appropriate action, such as valve closure. 

---