Monitoring temperature

The system was never put into the safety circuit because of various problem areas however, at the writing of this document, the Zone Temperature Monitor is being upgraded and readied for this function  

Hhexiaocouples are distributed In the themal shield to nalntaln tei rature control of the shield. It Is Important that the temperature of the shield he Icept optimized to reduce deterioration from hlg temperature. 

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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. 

For most points requiring temperature monitoring, either thermocouples or resistive thermal detectors (RTD s) can be used. Each type of temperature transducer has its own advantages and disadvantages, and both should be considered when temperature is to be measured. Since there is considerable confusion in this area, a short discussion of the two types of transducers is necessaiy. 

Since the higher thermal conduc tivity material (copper or bronze) is a much better bearing material than the conventional steel backing, it is possible to reduce the babbitt thickness to. 010-030 inch. Embedded thermocouples and RTDs will signal distress in the bearing if properly positioned. Temperature-monitoring systems have been found to be more accurate than axial-position indicators, which tend to have linearity problems at high temperatures. 

Provide temperature measurement in bottom of vessel to insure temperature monitoring... 

Provide redundant independent temperature monitoring instrumentation... 

They are basically temperature monitoring devices and can indicate the temperature on a temperature scale. They may be one of the following types. 

API Std 614 Lubrieation, Shaft-Sealing, and Control-Oil Systems for Speeial-Purpose Applieations API Std 670 Vibration, Axial-Position, and Bearing-Temperature Monitoring Systems ASME BPV Seet 11 Materials... 

Provides a purchase specification to facilitate the manufacture, procurement, installation, and testing of vibration, axial position, and bearing temperature monitoring systems for petroleum, chemical, and gas industry services. Covers the minimum requirements for monitoring radial shaft... 

API Standard 670, Vibration, Axial Position and Bearing Temperature Monitoring System, Third Edition, Washington, D.C. American Petroleum Institute, 1993. 

Appropriate design features may include feed-forward temperature control, high temperature alarms, high-temperature cutouts to stop feed flow and open a vent to atmospheric or closed system, adequate temperature monitoring through catalyst beds, etc. 

Answer An electronic temperature monitor could be equipped with a bar-code liquid crystal display which could be read by a portable bar-code reader. These devices have a memory so several readings may be taken before they are readout over a telephone modem to a data logging computer. The simplest way to read the acid type would be to post a label that is bar-coded to indicate the acid type. Tire acid quantity could be indicated by an acid level gage using a bar-code display of the level. The aluminum quality could be indicated by displaying a label in bar-code. The amount of aluminum could be determined by weight using a bar-code readout on the scales. 

The temperatures monitored in Fig. 5.2 are used by the brain to regulate shivering, blood flow to the skin, and sweating. The sensed temperatures also contribute to our overall feelings of warmth and other thermal sensations. 7 hermal sensation (TS) can be predicted over a wide range of activities (0.8 to 4 met) from simple deviations in the mean body temperature (T j,) from the mean bodv temperature when the person feels neither warm or cool but neutral (Fig. 5.2). 

Temperature monitoring of a flame arrester to detect a stabilized flame (endurance burning) should be provided if it is expected that this may occur, or if such an event has already occurred in the past. 

Continnons monitoring of pressure drop and temperature should be carried out. Pressure drop should be monitored if fouling and subsequent plugging is suspected or has previously occurred. Temperature monitoring should be provided if it is possible for a standing flame to occur on the flame arrester face and subsequently destroy the element (see Chapter 7). 

Figure 10-169. Seif-reguiating heat tracer for pipe and vesseis. Some simpier designs have temperature monitoring and power controi. (Used by permission Bui. (P6909) H53398 4/94. Raychem Corporation, Chemeiex Division.)...

Most plants can be cost-effectively monitored using a microprocessor-based system designed to use vibration, process parameters, visual inspection and limited infrared temperature monitoring. 

Succinylcholine-induced rhabdomyolysis Hypoxic encephalopathy Intrathecal administration of constant agents Defective temperature-monitoring devices Stimulation during light anesthesia... 

Next to the inlet channels on the right and the left catalyst-loading channels are placed to insert suspensions with catalyst particles (by applying a vacuum at the exit). Thermocouple wells serve for temperature monitoring. 

By inspection windows and use of a pyrometer, visual inspection of the catalyst and temperature monitoring on-site in a contactless manner were performed. It turned out that a glowing, homogeneous texture occurs at catalyst temperatures between 900 and 1200 °C, GHSV values up to 10 h and pressures less than 1 MPa [3]. This is an indication of the absence of soot deposits. At lower temperatures or... 

The dangerous reactions of alcohols, apart from the ones that involve the carbon chain, are linked either to the exothermicity of the reactions whose consequences are often aggravated by poor temperature monitoring, or the instability of the intermediate or final compounds formed. The first case often happens with oxidation reactions, the second especially with substitutions of active hydrogen or hydroxyl. Nitric acid will be the subject of special consideration since it can have both characters, without knowing which one played a role during accidents that have involved this compound. 

The same goes for temperature monitoring when preparing butyl-sodium from 1-dichlorobutane and sodium in a diethyl ether medium. Below -23°C the reaction only starts after a dangerous accumulation of chlorinated compound. Above this temperature the reaction is feasible, but difficult to control. 

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