Location of Gas Detectors in Explosive Environments IV

Posted by Prosense 04/06/2017 0 Comment(s)

7. Commissioning

7.1 Inspection

The gas detection system and all auxiliary equipment must be inspected prior to use to ensure that the methods, materials and components used to comply with TS EN 60079-0 after the installations are completed.

The elements to be inspected are given below.

  • The electrical connections must be properly made and the cable glands tightened.
  • Battery voltage and battery status should be checked and any necessary adjustments or battery changes should be made.
  • Faulty circuit testing should be performed.

Ensure that the complete operating instructions, plans and records for the complete system are complete and checked. This control must have the details of all detection points. The instructions should include details of the use, test procedure, calibration and operation, and all manufacturer's instructions.

7.2 Setting alarm points

In the case of a detection system displaying only the lower ignition limit, the alarm point shall be at the lowest possible level as possible to avoid false alarms (where the two or more alarm points are located). It should be taken into account that the alarm points may be different in order to ensure continuity of production in two different facilities using the same explosive gas production processes.

7.3 Operating instructions, plans and records

Instructions for the use, testing and operation of fixed gas detection systems should be available and should be included in the system file.

Plans of the facility should also be included in the file for maintenance and registration purposes. The locations of all parts of the system (control units, sensors and junction boxes) must be indicated with the location and dimensions of all cables and sample tubes. Finally, all inspection and calibration results should be recorded in the file.

8. Maintenance, routine operations and general management control.

The following examinations and tests should be carried out regularly to ensure the safe operation of the gas detection system.

8.1 Regular functional verification and visual inspection

The control and alarm panel should be checked and inspected once per shift if possible. Ensure that system notification lights, alarms, and electronic cards are working by using special equipment if any. Records kept in each control, including problems, must be signed, dated and filed. Urgent actions should be taken to correct the problems.

8.2 Regular calibration and system operation test

All gas detectors must be periodically calibrated and reacted more frequently by using appropriate calibration gases. The required frequency can be specified by the regulations of the responsible institutions. In many cases, suggestions or recommendations can be obtained from the manufacturer.

When determining the frequency of calibration, the most accurate result can be found by comparing and recording the regular calibrations after the installation. The number of deviations to be seen in the records will give a precise information about the calibration period.

The detection system outside the calibration should often be checked by qualified personnel. The check must be made in accordance with the manufacturer's instructions and the specific rules of the application.

9. Result

Even in the world where human beings have shaped themselves, meeting their basic needs can be realized at the end of industrial processes. In an environment where the industry has developed so far, industrial facilities themselves have become an environment that constantly threatens human life.

The raw materials used in the facilities or the output of gases and vapours that can be found as production output constitute a threat. Therefore, the presence of gas detection systems in the facilities is of great importance.

Thanks to the gas detection systems, which are selected and installed according to the needs of the facility and whose usage and maintenance are paid attention, the accidents in industrial facilities will be prevented to a great extent. In this way, human deaths and property damage will not occur.

10. Resources

 

[1]TS EN 60079-29-2 Elektrikli cihazlar - Patlayıcı ortamlarda kullanılan - Bölüm 29-2: Gaz dedektörleri - Tutuşabilir gazlar ve oksijen için dedektörlerin seçimi, tesis edilmesi, kullanılması ve bakımı

[2]TS EN 60079-29-1 Patlayıcı gaz ortamları - Bölüm 29-1: Gaz dedektörleri- Alevlenebilir gazlar için dedektör performans özellikleri

[3]TS EN 60079-0 Elektrikli cihazlar - Patlayıcı ortamlarda kullanılan - Bölüm 0: Teçhizat - Genel özellikler

[4]IEC 60079-10 Patlayıcı gaz ortamlarında kullanılan elektrikli cihazlar - Bölüm 10: Tehlikeli bölgelerin sınıflandırılması

[5]TS EN 60079-14 Elektrikli cihazlar - Patlayıcı ortamlarda kullanılan - Bölüm 14: Elektriksel tesislerin tasarımı, seçimi ve monte edilmesi

[6]TS EN 60079-17 Patlayıcı gaz ortamları - Bölüm 17: Elektrik tesislerinin muayenesi ve bakımı

[7]IEC 60079-20 Electrical apparatus for explosive gas atmospheres - Part 20: Data for flammable gases and vapours, relating to the use of electrical apparatus