Dichloromethane immersion tester
Instructions
1. Sample preparation: Cut a pipe section of at least 160 mm from the pipe. If the material is not heated as much as possible, carefully cut the section of the sample with a right-angle turning tool, and then gently grind it with 800 water sandpaper to make the section smooth and flat.
For large-diameter pipes, the samples with the well-cut sections can be cut into 2 to 4 pieces along the axial direction.
Carefully clean the inner and outer surfaces of the specimen with a dry cloth.
2, take out
Sample
container
, placed on the gantry, at
Stainless steel container
Pour into the methylene chloride,
The amount of loading is sufficient to cover the slope of the sample
,
usually
30mm can be.
in
Slowly add distilled water to the vessel to form it on methylene chloride.
not less than
20mm thick water seal.
3,
Add the constant temperature bath
230 mm deep pure water, then place the sample container in a constant temperature bath.
4. Connect the power supply to ensure that the temperature of the temperature control meter is turned on after the error is correct. The upper limit of the temperature control meter displays the temperature inside the oven, the lower row shows the test set temperature, and the corresponding temperature value (15 °C) is input. When the cursor stops flashing After the movement, the value entered is stored in the meter, and the enter key is pressed to start the temperature control.
5. When the temperature reaches 15 °C ± 0.5 °C
.
a, the loading of the sheet sample:
Sample to be prepared
The sample is clamped on the sample holder
,
After all the samples are clamped, put them into the sample container and adjust the height of the sample from the bottom of the container.
And ensure that one end of the ground surface of the sample is immersed in methylene chloride
;
b,
Loading of the whole tube sample: Take out the sample holder and use the large tube hanger. First, raise the horizontal rod of the sample hanger, put the whole tube into the sample container, and then clamp the sample with the wire clamp. Both sides, then adjust the height of the crossbar.
Open the stopwatch and start timing.
6, the sample is kept at a constant temperature of 30 minutes (minutes),
The sample is presented to the surface of the dichloromethane solution.
Drop (10-15) minutes, finally take out
Sample
Dry for at least 15 minutes. (Note: Do not touch the impregnated part of the sample during removal and drying)
7. Visually inspect the inner and outer surfaces and cross-section of the specimen with a naked eye. Measure the damage length of the inner and outer surfaces and wall thickness with a tape measure and a vernier caliper, and record all changes.
When doing the high temperature test, the operation steps are as above. When the temperature reaches the set temperature, the test is started after at least one hour of constant temperature.
Dichloromethane immersion tester
Precautions and maintenance
1. Methylene chloride is a highly toxic substance, and the test operator must wear protective equipment.
2. During the test, it is found that the test solution becomes turbid, and when it is observed and measured, the methylene chloride should be replaced at any time.
3,
Waste
Discarded dichloromethane
It is mixed with other fuels and burned. The combustion should be sufficient to prevent the formation.
.
4
Water seal must be used during use
5
Leakage emergency: personnel are quickly evacuated to the safe area, cut off the power supply, fire source, and covered with foam to reduce steam disasters.
6
, ambient temperature: 20 + 2 ° C, humidity is not more than 80%.
7
It is normal for the first time to reach the set temperature and stabilize it in the temperature range for a longer period of time. Start the test after stabilization.
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