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Industry NewsSeveral installation requirements for gas alarm.
Time: 2018-01-11 View: 2389
The gas alarm is used to continuously monitor the content of combustible gas in the air. Installed in place for gas is easy to leak, it can convert combustible gas concentration to DC4-20 ma standard signal output, can be connected to the DCS, also can and NA series controller of the company (secondary instrument). It is especially suitable for inflammable and explosive places where the working environment is bad and the staff is not easy to approach. Below, we have a brief understanding of the five installation requirements of the combustible gas alarm!
1. Find out what are the workshop to be monitoring device may leak, and calculate the leakage pressure, leakage, leakage of the direction of the unit time, and draw the chess lattice distribution, the severity of the supposedly divided into A, B, C three levels. According to the place where the leading direction, air may circulation phenomenon and the trend of the natural air flow of the plant, speculated that when large spill, combustible gas in natural diffusion trend direction in the plane of the figure.
2. According to the density of the leakage gas (greater than or less than the air), combined with the upward trend of air flow, the three-dimensional flow chart of the leakage flow is integrated. Based on the concept of three-dimensional flow of flammable gas leakage, the initial set point scheme can be made in the downstream position of the flow.
3. Further study the point leakage state of the leak point: it may be a microleakage or a jet leakage. If it is a microleakage, the location of the point is close to the leak point. If it is a jet leak, stay away from the leak point. Synthesize the above situation, draw up the final plan. In this way, the quantity and variety needed to be purchased can be estimated from the drawing. For a large and medium-sized workshop with flammable gas leakage, it is recommended to set a test point for each distance (10 ~ 20).
4. It is necessary to pay attention to the possibility of flammable gas leakage in the small and not continuous pumping station. Especially in the northern area of winter doors and Windows closed, the gas leak will soon reach the dangerous lower limit concentration. Generally, in the downstream of the prevailing wind direction, a detector should be installed. If the factory area is larger than 200m2, a monitoring point should be added. For a hydrogen leak sites, such as large generating set, oil refinery hydrogenation, electrochemical plant of electrolytic workshop, hydrochloric acid synthesis furnace workshop, the warehouse to store hydrogen cylinders, in laboratory, etc, have spirit chromatographic analyzer, install is at the top of the leak detector plane.
5. The gas density is greater than the air such as alkane (except methane gas, town gas), olefin (except ethylene), liquefied oil, gasoline, kerosene, etc., would fall below down to the bottom of the leak detector installed in the plane, and pay attention to the characteristics of the surrounding environment. For example, indoor and ventilated not smooth area, geosyncline gutter where easy accumulation of combustible gas, field underground cable conduit that leads to the control room, a sealing cover plate of the sewage groove, etc, are all regular or in the case of abnormal accumulation of combustible gas, these places should be as safety monitoring can not be ignored. Spray paint applicationsite, large printing press, and related workplaces, all belong to open combustible gas diffusion escape. If lack of good ventilation conditions, it is easy to make certain parts of the content of combustible gas in the air close to or reach the lower density danger, these are not to be ignored safety monitoring.
1. Find out what are the workshop to be monitoring device may leak, and calculate the leakage pressure, leakage, leakage of the direction of the unit time, and draw the chess lattice distribution, the severity of the supposedly divided into A, B, C three levels. According to the place where the leading direction, air may circulation phenomenon and the trend of the natural air flow of the plant, speculated that when large spill, combustible gas in natural diffusion trend direction in the plane of the figure.
2. According to the density of the leakage gas (greater than or less than the air), combined with the upward trend of air flow, the three-dimensional flow chart of the leakage flow is integrated. Based on the concept of three-dimensional flow of flammable gas leakage, the initial set point scheme can be made in the downstream position of the flow.
3. Further study the point leakage state of the leak point: it may be a microleakage or a jet leakage. If it is a microleakage, the location of the point is close to the leak point. If it is a jet leak, stay away from the leak point. Synthesize the above situation, draw up the final plan. In this way, the quantity and variety needed to be purchased can be estimated from the drawing. For a large and medium-sized workshop with flammable gas leakage, it is recommended to set a test point for each distance (10 ~ 20).
4. It is necessary to pay attention to the possibility of flammable gas leakage in the small and not continuous pumping station. Especially in the northern area of winter doors and Windows closed, the gas leak will soon reach the dangerous lower limit concentration. Generally, in the downstream of the prevailing wind direction, a detector should be installed. If the factory area is larger than 200m2, a monitoring point should be added. For a hydrogen leak sites, such as large generating set, oil refinery hydrogenation, electrochemical plant of electrolytic workshop, hydrochloric acid synthesis furnace workshop, the warehouse to store hydrogen cylinders, in laboratory, etc, have spirit chromatographic analyzer, install is at the top of the leak detector plane.
5. The gas density is greater than the air such as alkane (except methane gas, town gas), olefin (except ethylene), liquefied oil, gasoline, kerosene, etc., would fall below down to the bottom of the leak detector installed in the plane, and pay attention to the characteristics of the surrounding environment. For example, indoor and ventilated not smooth area, geosyncline gutter where easy accumulation of combustible gas, field underground cable conduit that leads to the control room, a sealing cover plate of the sewage groove, etc, are all regular or in the case of abnormal accumulation of combustible gas, these places should be as safety monitoring can not be ignored. Spray paint applicationsite, large printing press, and related workplaces, all belong to open combustible gas diffusion escape. If lack of good ventilation conditions, it is easy to make certain parts of the content of combustible gas in the air close to or reach the lower density danger, these are not to be ignored safety monitoring.
