Horizontal Furnace for Fire Resistance Testing

1) Furnace Temperature Control

According to national standard GB 9978, the furnace temperature rise curve should comply with the following formula:
T – T₀ = 345 × log(8t + 1)
Where:

t = time elapsed during the test (minutes)

T = furnace temperature at time t (°C)

T₀ = initial furnace temperature (should be within 5°C to 40°C)

2) Pressure Requirements

Pressure is measured at a height of 3 meters inside the furnace and 100 mm from the specimen surface:

5 minutes after test start: furnace pressure = 15 Pa ± 5 Pa

10 minutes after test start: furnace pressure = 17 Pa ± 3 Pa

3) Fire Resistance Limit Criteria

Loss of integrity

Loss of insulation:

The average temperature rise on the unexposed side exceeds 140°C above the initial average surface temperature, or

Any point on the unexposed side rises more than 180°C above its initial temperature.

4) Main Technical Parameters

Furnace dimensions: 4.2 m × 3.0 m × 1.5 m

Fuel: Liquefied petroleum gas (LPG)

Maximum operating temperature: 1300°C

Number of burners: 8

Specimen installation method: External mounting

Combustion control: Proportional combustion, automatic pressure control, automatic temperature adjustment, programmable temperature curve control, computer-assisted management

Exhaust system: Rear mechanical exhaust

Power supply: AC 380V ±10%, 50Hz; Power consumption: 65 kW

Furnace pressure measurement:

Range: ±250 Pa

Accuracy: ≤±2 Pa

Overpressure protection: Gas supply is shut off and test is terminated when internal pressure exceeds 100 Pa

Smoke filtration system:

Exhaust capacity: >4000 m³/h

Temperature resistance: ≥400°C

Air supply: >2600 m³/h

Installation space required (L × W × H): 10,000 mm × 8,000 mm × 5,000 mm