Filters performance test

Phthalylsulphathiazole Heat 4.0 g with 200 ml DW at 70°C for 5 minutes, cool and filter Perform test with 50 ml of filtrate. -do-... 

Vacuum filters are usually simulated with a Buchner funnel test or filter leaf test (54). The measured parameters are cake weight, cake moisture, and filtration rate. Retention aids are usually evaluated using the Britt jar test, also called the Dynamic Drainage Jar, which simulates the shear conditions found on the paper machine and predicts performance (55). 

In selecting cloths made from synthetic materials, one must account for the fact that staple cloths provide a good retentivity of solid particles due to the short hairs on their surface. However, cake removal is often difficult from these cloths - more than from cloths of polyfilament and, especially, monofilament fibers. The type of fiber weave and pore size determine the degree of retentivity and permeability. The objective of the process, and the properties of particles, suspension and cake should be accounted for. The cloth selected in this maimer should be confirmed or corrected by laboratory tests. Such tests can be performed on a single filter. These tests, however, provide no information on progressive pore plugging and cloth wear. However, they do provide indications of expected filtrate pureness, capacity and final cake wetness. 

Optical reference filter, n - an optical filter or other device which can be inserted into the optical path in the spectrophotometer or probe producing an absorption spectrum which is known to be constant over time such that it can be used in place of a check or test sample in a performance test. 

Fluorescein Sodium Dissolve 50 mg in 20 ml DW, and 2.5 ml dil. HC1 and filter. Perform the test with the filtrate. Complies with the limit test for Sulphates. 

In Tonsberg, Norway, an iron oxide filter was constructed to reduce odours from a pumping station close to the municipal treatment plant. The filter is shown in Figure 6. The filter treats odours caused by evacuation of air from a pressure main. The air enters the filter through a perforated pipe at the bottom and flows through the filter media into the atmosphere. The filter has been in operation since the Summer of 1978. Tests of the filter performance have been carried out regularly since then. 

Assessment of membrane damage was based on performance testing before and after chemical exposure. Testing was conducted in a small flat plate reverse osmosis unit designed to accommodate membrane discs of 45 mm diameter. Feed solution reservoir temperature was maintained at 25 1°C and the brine was continuously recirculated through a filter at the rate of 600 mL/min. Concentration polarization is considered negligible in this cell under these conditions. 

Failure of sensitive filtration tests such as ASTM D-2276, Particulate Contamination in Aviation Fuel by Line Sampling, can be due to caustic neutralized corrosion inhibitor salts. Sodium or calcium salts of dimer-trimer fatty acid corrosion inhibitors are gel-like in character. Filtration of jet fuel containing gelled corrosion inhibitor will be impeded due to plugging of fuel filter media by the inhibitor gel. This slowdown of filtration can result in failure of jet fuel to pass this critical performance test. 

These tests are performed after the HEPA filter leak tests and air velocity tests are completed. 

Perform a pressure hold test with the sterilized filter. Perform the filtration of the product to be sterile filtered using normal production conditions. After the filtration step, the filter should be tested again with the bubble point test. 

HEPA filter integrity testing is performed at 6-month intervals on level I and level II HEPA filters. HEPA filter testing includes Measuring (Machines, Eilters, Diffusers) Inlet and Outlet Air Velocity or Volume and Integrity Test of HEPA Filters Using Aerosol and Photometer. Refer to (provide reference to attachment no.). 

However, large holes or tears can be introduced into an otherwise effective sterilizing filter and performance tests have to be designed to ensure that the complete assembly of the filter membrane and its supporting equipment are devoid of imperfections. These include bubble testing in which gas is forced under pressure through the wetted filter and the pressure required for bubbles to first appear measured. In principle this identifies the largest hole present in the complete system. 

Electromagnetic Compatibility (EMC). In-house and site testing services are available for EMC. The Spectrum Control, Inc is equipped for testing to MIL-STD-461, MIL-I-6iSI and similar RFI (Radio Frequency Interference) specs and also performs testing in accordance with.FCC (Federal Communications Commission) and HEW (Health, Education Welfare) requirements. The personnel are familiar with RADHAZ (Radiation Hazard) filter design and measurement problems... 

The air is removed (pressure about 10 mm.) from the box and is replaced by purified nitrogen. After having performed tests for the absence of traces of oxygen inside the box, 17.0 g. (0.26 mol) of zinc is placed in a 400-ml. beaker, f To this is added a solution of 10.0 g. (0.0376 mol) of chro-mium(III) chloride 6-hydrate in 11.6 ml. of water. To the mixture so formed is added 23.0 ml. (0.27 mol) of concentrated hydrochloric acid. Then the beaker is covered with a watch glass. After about 15 minutes the zinc is largely dissolved and the solution is robin s egg blue in color. Next the watch glass is rinsed, the solution filtered quickly into a Buchner funnel suction flask, and the beaker and residue of zinc rinsed off with water. This done, the filtrate is poured into another 400-ml. beaker and the suction flask rinsed briefly. To the solution of chromium-(II) chloride is added at once a slurry of 27.5 g. (0.336... 

Table 1 lists the different membrane polymers available and the advantages and disadvantages, which depend on the properties of the polymer. The table shows that there is no such thing as a membrane polymer for every application. Therefore, filter membranes and the filter performance have to be tested before choosing the appropriate filter element. 

---