The subway generally belongs to the state's public property. Once a fire breaks, it will cause losses to the country and people's lives、property. Therefore, fire protection design and fireproof coating are generally used in subway cars to avoid fires. We usually use a fire retardant paint mil thickness tester to detect the fire protection coating thickness in the subway.
1.Fireproof structure inside the subway car:
The"sandwich"structure is generally adopted in the subway, specifically rubber floor cloth (3mm) - honeycomb board (18mm) - aluminum profile group welded floor (60mm). The lower surface of the profile is coated with a layer of fire retardant coating, which includes a matching primer, fire retardant coating. The thickness value is specified to be 1 mm.
2.Spraying of fire retardant coatings:
After installing the aluminum floor, we generally sandblast the surface of the aluminum floor. Its roughness is generally controlled at 6.3-12.5 μm. Then spray anti-corrosive paint (the main component is zinc phosphate). The film thickness of the dry film is controlled at 40 μm and the primer needs to be dried for a minimum of 36 hours and then sprayed with a fireproof coating. The coating thickness is controlled between 1000 and 1400 μm. After the fire-retardant coating is sprayed for at least 72 hours, it is necessary to spray a layer of paint (the main component is aliphatic acrylic urethane). The film thickness of the top coat is controlled to dry at 100 μm for at least 12 hours.
Be sure to remove debris, dust and grease when spraying fire retardant paint on the cabin. The roughness of the surface after sand blasting must meet the requirements of the process. The performance of fire-retardant coatings is closely related to the coating thickness. If the coating thickness is not up to standard during construction, it may affect the fire resistance of the compartment. After the completion of the construction, we generally use a fireproof paint mil thickness tester to check whether the fireproof coating in the subway is up to standard.
3.Measure the thickness of the fireproof coating in the subway:
Below we use the Linshang LS221 fireproof paint mil thickness tester to test the fireproof coating thickness inside the compartment.
In fact, the fireproof coating thickness is different in different parts of the subway. For example, the integrated cabinet of the compartment is equivalent to the central control function of the human brain, so the thickness requirement of the fireproof coating of the integrated cabinet is relatively high. The following is the data diagram of the subway integrated cabinet measured by the fireproof paint mil thickness tester.
The control cabinet of the subway generally controls the various equipment of the compartment, so the fireproof coating thickness is lower than that of the control cabinet. The following is the data chart of the subway control cabinet measured by the fireproof paint mil thickness tester.
The entrance and exit of the subway is usually where the air enters and exits. When the fire occurs, it is the easiest to supply oxygen to the combustibles. The following is a data map of the subway entrance and exit of the fireproof paint mil thickness tester.
The thickness of the fireproof coating on the parts near the window is not so high. The following is the data view of the subway window measured by the fireproof paint mil thickness tester.
In fact,in terms of the fire performance inside the subway. Fireproof paint mil thickness testers are critical for the detection of fire resistant coating thicknesses. For the detection of the fireproof coatings thickness, it is recommended to use the Linshang LS221 fireproof paint mil thickness tester. This fire retardant paint mil thickness tester has a measuring range of 0-2000μm and automatically identifies the measuring substrate. Thick or thin fireproof coatings can be tested.
For more information about the paint mil thickness gauges, please refer to https://www.linshangtech.com/tech/tech555.html