How to Leakage Test Pipette Performance?
For medical products, pipelines, pneumatic systems, leak testing (or more appropriately, serviceability testing, also known as leak measurement) should always be performed at a certain period of time. In this article, we will give answers to questions such as how to do a leak test.
The tightness test should be done with the help of a measuring device and the test results should be recorded in the report. Therefore, the operator has the technical expert report. Some building insurers include these inspections and certificates/reports under their own insurance coverage. For serviceability testing or leak testing, gas pipes are always tested under operating conditions/working pressure (not increased test pressure).
Pipettes are among the most important materials in many laboratories. The reliability and reproducibility of analysis results are also related to pipette reliability. Even in laboratories that work with the most careful and best pipettes, problems may arise with pipettes over time, depending on the intensity of use. The vast majority of these problems are thought to be due to the sealing system. It is generally like that. Especially in busy laboratories, sealing system gaskets can deform very quickly. Deformed gaskets cause deviations in results by drawing samples less than the required volume. Have your leak test done for the reliability of the test results. It is recommended to perform tightness tests at regular intervals in order to prevent test repetitions and increase reliability. Pipettes that pass normal calibration and maintenance tests and undergo preventive maintenance are less likely to leak. Thus, they give more consistent results. The leak test, which ensures your working safety, will also ensure that you are confident that you give correct results. How is the pipette tightness test done? During this test, the air pressure in the pipette is reduced, resulting in pipetting similar to normal pipetting. This pressure is maintained for a few seconds and changes in the pipette are observed. In case of leakage, the pressure change will be clearly observed. A simple process will reassure you that your pipette leak test results are reliable and will provide you with more reproducible results. It is especially recommended in laboratories where routine analysis is performed.
How is the Water Leakage Test Performed?
Unpressurized – Water Tightness Field Tests – In the construction site water tightness test applied in accordance with EN 13051 and AAMA 501.2 European norm EN 13051, each 1 meter length of the pre-determined critical detail areas is exposed to a constant flow of 5 lt/min for 30 minutes. In the construction site water-tightness test applied according to the American norm AAMA 501.2, each 1.5 meter length of the critical detail zones is exposed to a water flow at 2.4 bar pressure for 5 minutes. During both tests, the tested area is examined by making observations from the indoor environment of the building. If any water ingress is detected in the test areas during the test, the problem causing the leakage is detected. The necessary repair process is applied by the applicator and the same area is tested again after a certain waiting period. By applying the same test to other critical regions with the same details as the region in question, it is determined whether the problem only belongs to the region where the leak is experienced, or whether it is a systemic problem in all regions with similar details. Pressurized – Water Tightness Field Test – ASTM E 1105 In the pressurized water tightness tests performed in the field in line with the ASTM E 1105 standard, the area to be tested on the facade is exposed to water spraying from the outer surface, while static pressure is created in the indoor environment. The amount of static pressure is determined in line with the project and location characteristics.
How to Perform Hepa Filter Leakage Test?
The HEPA filter tightness test detects by-pass leaks that affect the cleaning success of the installed system, the failure of the filters (holes and other damages that may occur on the filter surface and connections), and filter leaks (by-pass leaks consisting of filter frame and sealing elements and other leaks from the surface). These tests do not check the efficiency of the installed filter. These are the tests performed by taking samples from the air outlet of the filter, the connection frame of the filter, or if the duct continues after the filter after the particles (aerosol) are introduced into the air flow direction of the filters. In particular, the HEPA filter tightness test will be applied in clean rooms and clean areas, after the connection of all devices and the completion of all equipment and items, during unmanned operation (at-rest), in existing systems that are already running and whose test time has come, and when final stage filters are changed. Moreover, Hepa and Ulpa Filter Equipment (DOP) Leak Test is carried out in accordance with ISO 14644-3:2005, EU Guidelines to GMP:2015.
According to the Hepa And Ulpa Fi iter Leak Tests standard, after the installation of HEPA filters, it is a test performed by using a photometer and aerosol generator (with Poly-Alpha Olefin liquid) to check whether there is leakage on the filter surface, gasket and filter cabinet outside the acceptance limits specified in the standard. You should perform these tests at least once a year, depending on the sensitivity of the processes in which HEPA filters are used and in cases where there is no change in the system. The other name of this test is lntegrity or DOP test. (HEPA Filter – High Efficiency Particulate Air Filter – High Efficiency Particulate Air Filter)
When choosing HEPA filters, care should be taken that the filter is certified. For filters to be certified, HEPA filters and air cleaners must pass certain tests. According to European standards, HEPA filters must remove at least 99.95% of airborne particles. In the United States, at least 99.97% of particles need to be filtered.
How to Perform a Leakage Test Through Gas Monitoring?
These are the tests performed by transmitting various gases to the area where the product to be tested and monitoring whether it passes through certain locations, especially for tests carried out in large sizes and at low pressures. Leakage and leak locations can be detected by this method. For the most part, Halogen gases, Helium and Hydrogen-Nitrogen mixture are the most commonly used gases in gas monitoring tests.
Halogen gases are the easiest to detect by test equipment and equipment, but they pose risks to the environment and human health during use. The test setup should be established taking into account human health. Helium gas is becoming more and more popular in the industry. The fact that it is not toxic and flammable, has a very low molecular weight and viscosity allows it to be used in a wide range. Helium gas can easily pass through gaps and cracks. It moves several times faster than air in the same environmental conditions. It is also very easy to detect, as its concentration in the air is very low (5 ppm). The downside is that it travels very slowly through the air, so it must stay in the test location for a long time to be detected. In addition, helium sensitive detection equipment and helium test rigs are quite expensive. Recently, the most used gas type in the leak test group by means of gas monitoring is 95% nitrogen and 5% hydrogen mixture gas. The gas that makes the real difference here and does the work is hydrogen. Due to its low molecular weight, low viscosity and high molecular speed, detection at the leak point is fast and easy. Although it does not harm the environment, its concentration in the air is even lower than Helium. The detectors of this mixture are relatively cost-effective, and the hydrogen-nitrogen mixture is already commercially available. Leak test applications through gas monitoring are carried out using a test gas-specific detector. They can be made as operator or automatic detector positioning. The special test gas can be divided into two categories: gas leak testing from inside to outside (from test volume to > environment) or from outside to inside (from environment to >test volume).