Vertical Shaft and Duct Fire Test Apparatus

TESTech Instrument (Suzhou) Technologies is one of the leading manufacturers and suppliers of vertical shaft and duct fire test apparatus in China. Welcome to wholesale premium test equipment at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.

The TESTech vertical shaft and duct fire test apparatus consists of a test chamber, burner, flue duct, control cabinet, gas control system, exhaust control system, temperature acquisition system, data acquisition and processing system, and user operation system.

The system is used to determine flame height for wires and optical fibers installed in risers or extending vertically through one floor height, thereby assessing cable and optical fiber burning classification.

The purpose of this test is to determine whether the flame burning characteristics of riser cables comply with the National Electrical Code requirements. This test does not evaluate the toxicity or corrosivity of combustion or decomposition products.

• Wall thickness is 203 mm concrete with density 106 lb/ft3 (1698 kg/m3). Thermal conductivity at 21.1 C is 0.38 Btu (0.055 W/mK). First- and second-floor slabs are made of 127 to 203 mm reinforced concrete.
• The top is formed by a sealed wall structure equivalent to the chamber walls. The second-floor measuring slot must be vertically above the first-floor slot of 305 mm x 610 mm.
• Each slot is 203 mm from the back wall and 102 mm from the side wall. Openings are arranged close to the wall based on chamber installation and combustion chamber position. Window positions are arranged for convenient observation.
• Bottom chamber internal dimensions: 2.44 m x 1.22 m x 1.22 m.
• First-floor chamber internal dimensions: 2.44 m x 1.22 m x 3.457 m.
• Second-floor chamber internal dimensions: 2.44 m x 1.22 m x 2.24 m.
• Both first and second levels are fitted with steel doors. The second floor has an access opening opposite the slot for specimen cable entry and thermocouple installation. Door frame edges use inorganic gaskets to prevent external airflow intrusion and ensure sealing.
• All internal tooling is made of stainless steel with corrosion resistance.
• Observation windows are provided for test monitoring.
• The chamber is equipped with ladders and guardrails for organizing, maintaining, and servicing the flue and test system.
• The burner assembly includes a 1/2 inch steel pipe, a 1/2 inch elbow, and a steel ignition dispersion plate, with electric spark gun outlet adjacent to the combustion gas outlet.
• The burner is made of stainless steel.
• The flue is made of stainless steel and includes a standard cross-shaped flow-straightening section to suppress turbulence and stabilize smoke flow.
• The control cabinet uses a 19-inch standard rack layout with monitor and control panel interfaces, modular integrated control and data acquisition systems, and imported atmospheric pressure and temperature-humidity sensors for real-time laboratory conditions display.

• Independent gas control cabinet completely isolated from the electrical control system.
• Gas alarm detector inside the gas control cabinet continuously checks for leakage and automatically cuts off gas supply if leakage is detected.
• American ALICAT imported mass flowmeter controls input flow 1657 +/- 86 cm3/s with accuracy less than or equal to 1%.
• Taiwan-brand gas pressure regulator and pressure gauge precisely adjust and display gas pressure.
• 10 kV spark ignition controller with safety flameout protection automatically stops ignition if the flame fails to ignite or goes out unexpectedly.
• All gas pipelines are stainless steel, corrosion resistant and durable.
• Ignition and gas flow are automatically controlled during the test.

• Exhaust fan and duct are installed at the center of the top of the chamber, with the fan connected to the duct.
• Three-phase variable-frequency centrifugal exhaust fan with exhaust capacity of 3000 m3/h.
• Taiwan Delta inverter plus variable-frequency fan controls exhaust speed to 3.5 +/- 0.5 m/s during the test.
• Bidirectional anemometer probe is installed in the flue test section.
• Imported differential pressure sensor range 0 to 100 Pa, accuracy +/- 2 Pa, response time less than or equal to 1 s for accurate flue exhaust velocity measurement.
• Fan, inverter, and measuring devices form a closed-loop wind speed control system for stable and precise automatic speed regulation.
• American FLUKE anemometer is provided for accurate air velocity testing below the burner.

• Imported Omega K-type sheathed thermocouple monitors chamber temperature at 38 +/- 11 C; wire diameter less than 0.25 mm, accuracy 0.1 C, range 0 to 1300 C.
• Imported Omega thermocouples include 1 K-type sheathed thermocouple for first-floor cement board bottom temperature and 8 K-type sheathed thermocouples for second-floor cement board bottom temperature; wire diameter less than 0.25 mm, accuracy 0.1 C, range 0 to 1300 C.
• Thermocouple signals are automatically acquired and displayed in real time by the computer plus PLC system.

• Distributed data acquisition system uses nearby-signal collection principle and transfers data through a data bus to the central controller, reducing attenuation from long-distance analog transmission and improving measurement and control accuracy.
• Data acquisition frequency is 1 s; system timing accuracy is 0.1 s.

• Operation software is developed in Labview with a concise, attractive, and user-friendly interface.
• Sensor data, process variables, and test results are displayed through multiple screens with curves and digital values for clarity and accuracy.
• Software uses modular programming and provides monitoring, calibration, testing, data browsing, data editing, and report modules.

• Lgnition, wind speed, and data acquisition/analysis are fully automatic during testing, and gas supply is automatically cut off after the test.
• Flame detection function automatically closes the gas valve if ignition fails or if the flame is extinguished unexpectedly during the test.
• Collected data are transmitted by bus, and the software automatically records, calculates, analyzes, and synchronizes results.
• Sampling parameters, process variables, and test results are displayed synchronously during testing.
• The system provides data records, test results, and test reports.
• Test data include temperature curves, airflow curves, and related parameters.

• Detailed description of wire construction, including conductor size.
• Length of wire including the sample cable.
• Maximum flame height of the specimen set during the test, approximately 15 cm.
• Damage height during burning of the sample cable and the defined damage type.
• Maximum temperature recorded by the eight thermocouples at the second-floor bottom slab.
• Temperature versus time graph for the eight second-floor bottom slab thermocouples.
• Airflow rate in m/s versus time graph for the first-floor bottom slab opening.

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