Part 1: General floor plan

1. Class A and B workshops and warehouses with explosion hazard should be set up independently, and should be open or semi-open, and the load-bearing structure should be reinforced concrete or steel frame, bent frame structure.

2. The layout of the factory building with the danger of explosion should preferably be rectangular, which should be perpendicular to the dominant wind direction or the included angle should not be less than 45°, so as to effectively use the wind through the hall to disperse the explosive gas.

3. The explosion-proof workshop should be set up separately. If it must be adjacent to the non-explosion-proof workshop, it can only be adjacent to one side, and the two should be separated by a firewall or an explosion-proof wall. There should be no direct communication between two adjacent workshops to avoid the impact of explosion shock waves.

 

Part. 2: Plane and Spatial Arrangement

1. Main control room and sub-control room

1) The general control room of Class A and B workshops with explosion hazard shall be set up independently.

2) The sub-control rooms of Class A and B workshops with explosion hazard should be set up independently. When set adjacent to the outer wall, a fire partition wall with a fire resistance rating of not less than 3.00h should be used to separate them from other parts.

2. Parts with explosion hazard

1) Class A and B production sites with explosion hazard should be arranged near the pressure relief facilities near the outer wall of the single-storey factory building or the pressure relief facilities on the top floor of the multi-storey factory building near the outer wall.

2) The equipment with the danger of explosion should avoid the main load-bearing components such as beams and columns in the workshop.

3) Protective measures such as door buckets should be installed in the stairwells, outdoor stairs in the explosion-hazardous area, or the connection between the explosion-hazardous area and the adjacent area. The partition wall of the door bucket should be a fire partition wall with a fire resistance rating of not less than 2.00h, and the door should be a Class A fire door and should be staggered from the door of the stairwell.

3. Plants that emit flammable gas and flammable vapor

1) For Class A workshops that emit flammable gas and flammable vapor lighter than the air, light roof panels should be used as the pressure relief area. The ceiling should be as flat as possible without dead ends, and the upper space of the workshop should be well ventilated.

2) Class A workshops that emit flammable gases and flammable vapors heavier than air and Class B workshops that have the danger of dust and fiber explosion shall meet the following requirements:

A non-sparking ground should be used. When using insulating material as the overall surface layer, anti-static measures should be taken.

For workshops that emit combustible dust and fibers, the inner surface should be flat, smooth and easy to clean.

It is not advisable to set trenches in the workshop. When it is really necessary, the cover should be tight. The trenches should take effective measures to prevent the accumulation of combustible gas, combustible vapor, dust and fibers in the trenches, and should be sealed with fireproof materials at the connection with the adjacent workshop.

4. Plants and warehouses that use, produce or store Class A, B and C liquids

1) For workshops that use and produce Class A, B and C liquids, the pipes and trenches should not be connected with those of the adjacent workshops, and oil separation facilities should be set up in the sewers.

2) Class A, B, and C liquid warehouses should be equipped with facilities to prevent liquid from spreading. Measures to prevent water immersion should be taken in the warehouse of goods that will burn and explode when wet. 

5. Underground and semi-basement

1) Class A and B production sites should not be set up underground or semi-underground.

2) Class A and B warehouses should not be set up underground or semi-underground.

The intrinsically safe system is a circuit system that achieves electrical explosion-proof by limiting electrical energy, and does not restrict the use of places (where the ia level is applicable to dangerous places in Zone 0, Zone I, and Zone II) and explosive The type of gas mixture (limited to include all flammable gases); with a high degree of safety, maintainability and economy. A schematic diagram of an intrinsically safe system.

 

Part 3 Pressure Relief

 

1. Pressure relief facilities should be set up in the workshop with explosion hazard or in the part with explosion hazard in the workshop.
2. The pressure relief facilities should use lightweight roof panels, lightweight walls, doors and windows that are easy to relieve pressure, etc., and materials such as safety glass that do not produce sharp fragments during explosion should be used.
3. The pressure relief facilities should be set away from crowded places and main traffic roads, and should be close to the parts with danger of explosion.
4. The mass of lightweight roof panels and walls used as pressure relief facilities should not be greater than 60kg/㎡. The pressure relief facility on the roof should take measures to prevent the accumulation of ice and snow.
5. For Class A workshops that emit flammable gas and flammable vapor lighter than the air, light roof panels should be used as the pressure relief area. The ceiling should be as flat as possible without dead ends, and the upper space of the workshop should be well ventilated.

Part 4 Calculation pf Pressure Relief Area

Calculation formula of pressure relief area:

A=10CV2/3

A--pressure relief area (㎡);

V--the volume of the workshop (m³);

C - pressure relief ratio

1) Length-to-diameter ratio: the ratio of the product of the longest dimension in the geometric dimensions of the building and its cross-sectional perimeter to 4.0 times the cross-sectional area of the building.

2) When the aspect ratio of the factory building is greater than 3, the building should be divided into multiple calculation sections with an aspect ratio not greater than 3, and the common section in each calculation section shall not be used as a pressure relief area.