Alarm systems indications

At B, develop an alarm system indicating when a wrong connection is made... 

Assumed values of HEP corresponding to task 1 and 3 are illustrative only. In current practice the highest and the lowest bound for HEP are estimated by experienced experts and they depend on complexity of the sequence and tasks required to prevent from accident. Current technological solutions apphed in alarm systems indicate that achieving HEP lower than 10 is very difficult and in some cases almost impossible. 

Fire detection and fire alarm systems. Control and indicating equipment. With BS EN 54-4 1997, superseded BS 5839 Part 4 1998 which remains cuiTcnt... 

Employers, at a minimum, must have an emergency action plan that will facilitate the prompt evacuation of employees when there is an unwanted release of a highly hazardous chemical. This means that the employer s plan will be activated by an alarm system to alert employees when to evacuate, and that employees who are physically impaired will have the necessary support and assistance to get them to a safe zone. The intent of these requirements is to alert and move employees quickly to a safe zone. The use of process control centers or buildings as safe areas is discouraged. Recent catastrophes indicate that lives are lost in these structures because of their location and because they are not necessarily designed to withstand over-pressures from shock waves resulting from explosions in the process area. 

Activation level install alarm system for indicating valve left open. Observation level provide checklist to operators make valve more accessible or remotely operable. 

Remote manual starting is initiated from a remote point rather than from the fire alarm system or a pressure switch. The remote point should be at a constantly attended area. Pump running and trouble indicators should be provided at the remote start point. 

Process facilities may be divided into primary operational divisions called zones. These zones are divided into areas. A coded signaling system can be used to indicate the zones and area numbers. A third number may be used to indicate a station within the area boundaries. The plant emergency alarm system should ... 

Alarms that indicate the operation or malfunction of the system... 

G. Throughout the demilitarization operations a network of detectors will provide accurate and immediate indications of agent contamination. If an area of contamination is detected by alarm systems, that area will be chemically decontaminated and checked to verify that there is no detectable concentration of agent present. 

The system as developed is shown In Figure 7. The device operates from standard 110 v ac it weighs 450 pounds and measures 6 by 2.5 by 2.5 ft. Shown is the strip chart recorder, refrigerator, and alarm-light indicator. 

The air supply of clean rooms , C and D must be such that sufficient flow takes place and that the air pressure in a clean room is higher than that in the surrounding rooms of lower class. The last filter must be located as closely as possible at the air inlet to the work room. An alarm system must exist in order to signal a failure of the air supply. A differential pressure indicator must be located at least between the rooms where this is especially important... 

Table 15.8 lists the typical protection, alarms and indications that would be provided in the system. 

Modern cryogenics plants are well-instrumented to indicate process temperatures and pressures, flow rates, liquid levels, and contaminant concentrations. These instruments are used for measurement, control, and safety if a particular variable (temperature, pressure, flow rate) falls outside the control range, a corrective action is initiated automatically and, if necessary, an alarm may also be actuated. Complete alarm systems are now available commercially for use with all the common safety devices. Further, many are designed on the failsafe principle and sound an alarm in the event a power failure occurs. 

In conclusion, the areas of opportunity identified to improve the monitoring process are the following (1) objective indication of distress levels, (2) effective alarm system, (3) improved sensor sensibility to avoid intermittent registration, and (4) informed use of CTG systems by untrained users to avoid stress if they cannot find the location of the baby. 

Indications of sodium level gauge in the pump tank actuation of warning alarm system. 

A dedicated nonrecirculating ventilation system is to be provided. The supply and exhaust components of the system are to be balanced to assure directional airflow from the area of least hazard to the areas of greatest potential hazard. The differential pressure/directional airflow between adjacent areas is to be monitored and alarmed to indicate malfunction of the system. The airflow in the supply and exhaust components is to be monitored and the components interlocked to assure inward (or zero) airflow is maintained. 

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