GB 29812-2013Industrial-process control -- Safety of analyser houses (English PDF)

4.1 Response Time

It should be estimated from the sampling point to the analyzer line and calculate the necessary flow rate to determine a time lag is generated, the sample flow rate and the loss no suitable.

4.2 Utilities

It should be estimated for all utilities such as connection length of the air, steam, electrical, circuits and signals of the sample.

4.3 Security

4.3.1 Location

Analysis cabin (AH) to be disposed in the release of toxic or flammable source at a safe distance is not prone to accumulation of these substances local.

4.3.2 Emergency channel

It should determine the withdrawal route, and kept clear, and towards the emergency channel to avoid the danger zone as much as possible.

4.3.3 Area Classification

Analysis cabin ventilation and air source internal security department or user management area classification process equipment should be determined.

4.3.4 Danger Zhou Bian

Taking into account the sampling line analyzer or a possibility of danger in the analysis of any adjacent room or cabin.

4.4 Entrance

Maintenance personnel and supplies are required entrance, analyzer houses should be placed on the ground or the elevator entrance. Consideration should be given to heavy equipment such as Cylinders and secure mobile analyzer/installation requirements, taking also into account the convenience of process equipment such as heat exchangers, such as maintenance.

5.1 General

Depending on the type of the sample and the analyzer, the importance of the application and operating environment, the analyzer and the analyzer sampling systems require different protection grade. When the building and maintenance requirements for this kind of work environment unfit, should provide analytical lodge such additional protection. Additional protection can be Meet the instrument performance, and ease of maintenance.

Select a room depends on many factors such as.

--- analyzer classification and/or the region where the sampling system;

--- places range of environmental conditions, including temperature, rainfall, humidity, snow, wind, dust, sand, direct sunlight and corrosive gases;

Reliable, accurate and safe operation of a predetermined environmental conditions --- analyzer user;

During --- maintenance of equipment and personnel protection requirements;

--- system consisting of maintainability and accessibility requirements;

Process --- analysis regions where the cabin/environmental conditions (e.g., chemical or equipment loading, unloading and transport, noise, vibration, chemical Leakage, etc.).

This chapter describes the analysis of a hazardous area of the cabin and/or placed in cabins Analysis combustible/toxic sample introduction. Those in Analysis of non-hazardous area and the cabin is not flammable or toxic samples, service, or from a mixture of the calibration of the air introduced hazardous area Just hut provisions analyzer accurate and reliable operation of the necessary environmental conditions.

5.2 General Requirements

This section specifies general requirements for the safe operation of the analyzer house, without regard to leaks or flammable substances (see Chapter 6) or substances hazardous to health (See Chapter 7).

5.3 Size and layout

Analysis cabin size analyzer and auxiliary equipment depending on the number, size and access requirements. Should consider all ventilation, and drainage system Systems, spare parts storage, distribution system, on-site records. The minimum recommended space for the length and width of 2.5m, a high 2.3m, barrier-free minimum clear height 2.0m. We recommend leaving 30% of spare space for future supplementary equipment. Avoid ceiling, ducts and air circulation dead.

5.4 Structural requirements

5.4.1 Materials of Construction

Construction material should have a refractory and anti-corrosion ability of the substance in contact therewith.

5.4.2 Wall

It should be determined such as antistatic, corrosion-resistant, weatherproof and fire site requirements, and then select the appropriate materials. If the device against a wall, the wall Require appropriate reinforcement. Penetrate walls should be kept to a minimum, and use comply with the relevant structural and safety requirements (for example, water resistance, fire retardant properties, Flame retardancy and mechanical strength, etc.) of suitable material sealed.

5.4.3 Ground and foundation

It should be non-porous surface, and having a tolerance of non-slip floor material may spill. Ground to be clean, for example, to consider light Slight slope and drainage systems. If the surface water drainage system, drainage system should be no hindrance to the analysis hut, the liquid can be completely discharge. Measures should be taken to prevent the ingress of liquid outside. These include higher ground, or setting it higher than the external stairs at the entrance or suitable ramp or bottom of the sealed cabin.

5.4.4 Door

Doors should open outwards and be self-closing. Doors should be installed "emergency escape lock" so that once locked from the inside to open. Need security on the door Mounted crushing safety glass. If the main door inside and outside the export of obstacles need to be considered in the emergency exit door away from the main gate or the second set, for example, red Hit escape board.

Note. When analyzing the lodge is part of the building, other security considerations more important.

5.4.5 Window

Unless the cabin is divided sealed and placed in non-hazardous area non-hazardous area, otherwise, all the windows of the cabin analysis should be tightened to prevent analysis (Dangerous) vapor infiltration.

5.4.6 Roof

Suitable roof designed to withstand loads (snow, equipment, people, etc.).

5.5 Equipment

5.5.1 Lighting

Emergency lights or lighting devices should be kept in operation. Minimum illumination shall meet the requirements of the relevant standards or work properly.

5.5.2 Communications

If the analysis can not be detected around the device sent from the security alert the cabin, to be received in the alarm analysis cabin features should be considered Installation of a telephone to the place was on duty.

5.5.3 Piping and valves

Under normal operating conditions, hut Analysis pipes, vessels and equipment, the opening should be avoided to prevent any leakage of dangerous substances to the analysis of small house. Functional substance and a valve in the conduit should be clearly identified. Shutoff valve should be disposed outside the analyzer house. The exhaust gas should be collected in a closed system or delivered to the outside of the cabin analysis facilities. There is a fault in the case, all possible transport large quantities of hazardous substances into the cabin analysis Line, and analysis from the analysis hut inlet apical cabins should have automatic shut off valve, throttle or restrictor means.

5.5.4 Utilities

5.5.4.1 the amount of dangerous goods Auxiliary dangerous goods should be limited to the minimum amount needed to operate the analyzer system.

5.5.4.2 Hazards identification

Any place with a fire, explosion or unhealthy should be clearly labeled.

5.5.4.3 Choking agents (e.g. nitrogen, carbon dioxide)

5.5.4.3.1 all cabin Analysis asphyxiant line connected analyzer house outside the pipeline should be installed or throttle limiting means limit to meet the requirements made of the flow rate of the ventilation system.

5.5.4.3.2 cabin when the analysis memory potential risk of hypoxia (for example, backup instrument air with nitrogen), the analysis should Ann hut Hypoxic air detector means, and a fault alarm safe human duty site and remote locations.

5.5.4.4 Auxiliary storage of dangerous goods

5.5.4.4.1 dangerous goods shall be stored in the auxiliary outer cabin analysis.

5.5.4.4.2 If inevitable auxiliary gas reservoir or a high pressure gas cylinder of calibration gas in the analysis of the hut, the isolation should be stored in a continuous ventilation A cabinet or directly to the station via pressure relief valve and the safety rupture disc is mounted on the cylinder in order to prevent high pressure gas cylinder caused by fire heat the pressure rise. Be safely released from the safety rupture disc of the gas leaking outside the cabin analysis. Security measures can also be relevant qualifications sector Shi carried out.

5.5.5 Fire Equipment

Suitable fire-fighting equipment should be placed at the door.

5.5.6 Ventilation

Installation of ventilation equipment for climate control, anti-corrosion, anti-suffocation, explosion-proof (see Chapter 6) and/or personal safety (see Chapter 7).

5.5.6.1 General

All ventilation air changes per hour should be no less than five times. Ventilation air source is preferably provided in the non-hazardous area, if this can not be achieved to Seeking, in equipment suitable for analysis cabin zone 2 region, or worse, an air zone 2 may be used. Or one or intake port mounted More combustible gas detector monitors, when the detected value is less than 20% LEL to stop ventilation.

Ventilation should be installed at the inlet of a dust filter.

5.5.6.2 Temperature

To ensure the safety performance monitoring equipment and alarm systems, analysis of the temperature in the cabin should be maintained at the recommended ranges.

5.6 Signage/Description/File

5.6.1 Entrance

Analysis paste at the inlet of the cabin type of marking signs indicate danger, allows only qualified staff access, including signage Information analysis agency responsibility hut (name, department, phone number, etc.).

5.6.2 Alarm

If needed, where applicable, the analysis hut should produce the following safety-related on-site alarm and Indicators.

a) ventilation failure (purge and/or positive pressure ventilation);

b) the combustible gas (concentration exceeds 20% LEL);

c) toxic gas (concentration exceeds allowable limits);

d) hypoxia;

Note. the oxygen concentration must be maintained at over 18%, or statutory requirements.

e) fire or smoke;

f) releasing automatic fire extinguisher;

g) Gas/fire monitoring equipment malfunction.

Note 1. The relative density is determined hazardous flammable gas installation position and toxic gas detector. When the gas lighter is detected, the detector is placed in the house requires Near the top, the gas detection heavier, placing the detector near the ground.

Note 2. The gas detector data record provides the basis indoor meets safety requirements.

Should generate an alarm in the following places.

a) Analysis hut conventional sound or visible light (e.g., strobe) alarm;

b) In the process of continuous manned place;

c) the inlet outside the cabin should provide analysis of toxic substances represent, choking agents and alarm lights lower explosive limit, and should be considered Other alarm.

Note. It is recommended to set non-hazardous state indication signal.

5.6.3 Safety Regulations

Analysis cabin safety procedures as a file is placed in the apparent position of the room, the staff analysis in the cabin should receive adequate training.

5.6.4 Supplementary Data

The following items should be included in the file.

--- analysis and design data cabin ventilation system (eg, ventilation failure alarm set point);

--- gas detection system design information (e.g., measurement range, measurement component, alarm set points and corrective action);

--- All wiring and logic diagram of the alarm system on and off;

--- toxic exhaust system design process and data handling exhaust air pollution and under unstable conditions;

--- provide clear and understandable and accurate operation of the process of writing instructions (for example, filling material for the auxiliary personnel engaged in the daily work of Toxic Substances Description of the container).

6.1 General

This chapter sets out the risk analysis of security requirements through the adoption of internal cabin ventilation and explosion protection systems to prevent the use of internal or external. this in addition, also discussed ways to ensure the safety of the use of natural ventilation. Analyzer should also comply with other protective measures in the non-hazardous area operation, but They are not included in this standard.

Assisted by the user to use protective measures, where appropriate.

Note. This standard is not supplied to the risk analysis and risk cabin combustibles within the combustion fuel or combustible exhaust conduit means to return, and therefore, Whether analyzer is installed in the cabin analysis, flame arrester should be placed in the vicinity of the sampling point.

6.2 General requirements

6.2.1 Electrical equipment installed in the cabin of the analysis should meet the classification analysis cabin interior region corresponding explosion.

6.2.2 emergence of a dangerous situation, no explosion-protected electrical equipment should be disconnected, the best automatic or external long-term manned place Manual switch off. Without proper authorization are not allowed to reopen.

6.2.3 Configure the external disconnector, so that in an emergency, shuts down the entire power analyzer cabin. Without proper authorization, not Allowed to reopen.

6.3 Adopt artificial ventilation of explosion-proof measures

6.3.1 Classification

The risk of explosion from the following sources.

Note. GB 3836.14-2000 gives guidance on hazardous area classification.

6.3.1.1 External explosion hazard (see 6.3.2)

NOTE. When analyzing cabin outlet toward the non-hazardous area, it is considered a hazardous area adjacent to the plant analysis of external cabins there is no danger.

6.3.1.2 due to internal flammable gas or vapor explosion hazard (see 6.3.3).

6.3.1.3 due to an internal explosion hazard of flammable liquids (see 6.3.4).

Any permutation or combination of 6.3.1.3 and 6.3.1.4 6.3.1.1,6.3.1.2.

6.3.2 The presence of an external explosion hazard analysis hut requirements

6.3.2.1 Analysis cabin partition zone 0 and 1 are connected should be distinguished boundary of air.

5.5.6 Analysis cabin by supplying clean air, thus creating a positive pressure to force the ventilation in the room, to prevent externa...