8 Experimental step
8.1 Preparation of experimental equipment
8.1.1 General. Safely expose the human body model of the instrument to test the flash fire requires startup and exposure sequence, which is a specific test device. Each laboratory should establish each exposure start checklist used. As a lowest list, the following elements should be included.8.1.2 Flame Exposure Chamber Cleaning. The ventilation room is for a period of time to remove a volume of air at least 10 times, the volume of the chamber. The purpose of cleaning is to remove any fuel that may have been leaked from the supply line and can produce explosive air.
8.1.3 furnace. Turning off the supply line exhaust valve and is charged to the fuel to the open valve at the working pressure at the working pressure instead of the chamber. The combustion of propane is provided by the last system valve just in each test exposure opening. High voltage and low voltage detectors should be set as close as possible to providing a gas source failure of the system's operating pressure shutdown.8.1.4 Confirmation of Exposure Conditions. The step of detecting the detection of the inspection body described below is exposed to the test flash flame retardant for the bare body model for at least 4 seconds, or for planning test exposure if less than 4 seconds. Confirm that the consolidated heat flux density and its standard deviation are less than the predetermined value (see D. 2). If the calculated heat flux density or variation is not specific, the cause is determined, and the test is correctly carried out.
8.2 Sample detection
8.2.1 General. Perform the following steps to perform the instrument to test the dummy and prepare the test report. Previously, the body model was previously confirmed that all the temperature of all heat flux sensors was less than 32 ° C.8.2.2 Give the fake person to protect the protective clothing. Test samples specified in the test of the human body model. The sample may need to be cut to provide a sufficiently large opening for obstruction dressings around the data line. If the cut is required, cultivate with uncomfortable closed, such as metal cartridges in the clothes. Arrange the sample components of the human body in the same manner because they are used by the user. The same
in each test sample is used to minimize mutation at test results. If a t-shirt and underwear are specified, it may be necessary to cut the T-shirt up to the back and easy to wear. Repair and unbustive closed, such as metal U-shaped nails or refractory threads. Confirm the position of the human body model and weapon.8.2.3 Recording Sample Identification, Test Conditions and Test
The following should be recorded:
1) The purpose of the test;
2) Test series or login number;
3) Specimen identification, including underwear;
4) Test conditions;
5) Test observation;
6) Exposure time;
7) Data acquisition time;
8 ) When it is placed on the front and rear of the human model test piece;
9) any other information in the related test sequence.8.2.4 Confirmation of safe operation conditions and ignites the flame lighting. Make sure all security requirements have been met, it is safe, please expose samples. When all security requirements are met, ignite the flame and confirm that the ignition flame flame of each burner used in the test exposure is actually bright, so it is recommended that all pilot flames are further processed. Visually confirm.
8.2.5 Start image recording system. Start an image recording system for each test for a visual file.8.2.6 Exposure of the test sample
By pressing the corresponding button computer to start the test exposure. When the computer program starts data acquisition, when the exposure of the torch gas supply solenoid valve is turned on, stop the data acquisition at the end of the specified time, if a portion of the item is opened, open the fan (S) to ventilate. Observe and record any flame duration, strength, and position after the sample.
8.2.7 Collect heat transfer data. Enter the time period selected for the length of the data acquisition to the appropriate exposure condition field. This time should be long enough to ensure that all energy stored in the sample is released into the atmosphere and the surrounding human body model. Confirm that the collection time is enough to determine all the sensors expected to be stabilized by detecting information that calculates the calculated burns to determine that all sensors are expected to be stabilized, rather than continue to rise, ending in the data acquisition time. If the amount of burns is not a constant acquisition time for the last 10 seconds, improve the collection time to achieve this requirement, and retest a new sample. For single-layer clothing, 60 seconds have been found to be satisfactory, and need to be 120 seconds for multi-layer clothes and assemblies.8.2.8 Sample Phenomenon Record. Any phenomenon recorded in the contact reaction of the sample. These may include, but are not limited to, after relative, the intensity and length of the flame exist in test samples, smoke generation, shrinkage, carbonization, or observations. These phenomena will become a permanent component of test records.
8.2.9 The occurrence of heat transfer and the calculation of burns. Start the computer program to perform the amount of heat transferred to the surface of the human body, time, calculation at the beginning of the first, second, and three degrees of burn (see 5.4.3), and print These results form a part of the test report (see section 9).
Note: These operations can be tested immediatelyPost, or postponed.
8.3 Prepare exposure in the next test.A front and rear portions of visual images in the test sample of the human body model were disturbed.Record of any additional visual images in the process of removing the sample from the human body model.If the heat flux sensor is too hot, the exhaust fan (S) is operated to cool to less than 32 ° C.Check the body model and heat flux sensor to ensure that they are cleanly decomposed materials.If the deposit exists, clean up the human model and the heat flux sensor as an attachment D to ensure that the body model and the heat flux sensor are dry. If necessary, dry, such as: ventilation fan before the next test (S).
Article Source: Qinsun (Hong Kong) Co., Ltd.
You can also send a message to us by this email email@example.com, we will reply tu you within 24 hours.Now tell us your need,there will be more favorable prices!