JB/T 4333.2-2013Recessed plate filter press & plate and frame filter press - Part 2: Technical specifications (English PDF)

4.3.2

The insulation resistance, which is measured on the electrical control device of the filter press, during the insulation resistance test, shall not be less than 1 Mohm. The electrical control device shall not have breakdown discharge, during the withstand voltage test.

4.3.3

When the filter press is used in an environment, which has explosion- proof requirements, the electrical part shall comply with the relevant requirements of GB 3836.1; moving parts with relative friction and impact are not allowed to produce sparks.

4.3.4 For the filter pressure, which automatically hold pressure through

hydraulic tight pressing, the hydraulic system shall be equipped with a safety device.

4.3.5 A fully automatic filter press shall be equipped with safety protection facilities, such as emergency (temporary) shutdown devices, safety light curtains, etc.

4.4 Requirements for materials and purchased parts

4.4.1 For the materials of the part of the press filter, which is used in the food, beverage, pharmaceutical and other industries, in contact with the material, they shall comply with the relevant national regulations on medicine and food hygiene.

4.4.2 The materials and purchased parts, for manufacturing the filter press, shall comply with the relevant standards AND have the supplier’s inspection certificate. If there is no certificate, it must be inspected by the quality inspection department, before it can be used.

4.4.3 The materials, which are used to manufacture the filter press, are allowed to be replaced by materials, which have the same or better performance;

however, it must be approved by the design department.

4.5 Requirements for main parts

4.5.1 The requirements, for the main parts of the filter press, shall meet the requirements of the relevant standards.

4.5.2 For the austenitic stainless steel welded parts of the filter plate and filter frame, they shall be subject to the tendency test of intergranular corrosion; there shall be no tendency of intergranular corrosion.

4.5.3 The filter plate and filter frame shall meet the requirements of JB/T 4333.3.

4.5.4 The membrane filter plate shall meet the requirements of JB/T 4333.4.

4.6 Appearance quality requirements

4.6.1 The appearance of the product shall not have obvious defects, such as dents, roughness, other damage.

4.6.2 When the filter plates and filter frames, of the side beam filter press, are compressed, they shall be arranged neatly. The misalignment size of two adjacent filter plates shall not be greater than 3 mm; the maximum misalignment size of the filter plate of the whole machine shall not be greater than 10 mm.

4.6.3 Exposed pipelines for electrical, hydraulic, cleaning, air blowing, etc., shall be compactly and neatly arranged; fixed with pipe clamps. There shall be no distortions in the pipe.

4.6.4 The color tone of the bluish-treated parts shall be consistent; the protective layer of the plated parts shall not fall off.

4.6.5 The quality of the painted surface shall meet the requirements of JB/T

7217.

4.6.6 The signs shall be flat, firm, not skewed.

4.6.7 Anti-corrosion requirements: Filter presses, which are used in corrosive environments, shall be subject to the anti-corrosion treatment. For filter presses, which are used in the food industry, sanitary grade anti-corrosion treatments shall be applied to the parts, which are in contact with the materials.

4.7 Configuration requirements of filter press

4.7.1 Filter presses are divided into side beam filter presses and suspended beam filter presses, according to the support mode of the filter plate. The filter press is divided into a piece-by-piece plate shifting filter press and a quick opening filter press, according to the plate shifting method.

4.7.2 The filter press is equipped with automatic plate shifting device, filter cloth retraction-extension device, filter cloth rapping device, filter cloth cleaning device, liquid collection device, filter cake storage device, filter cake drying system, automatic control system, as required.

4.7.3 For filter presses, which are equipped with automatic plate shifting device, a hand-controlled pause device shall be set at a place that is easy to operate, so that the plate action can be stopped and resumed at any time, according to the operation needs, during the whole process of unloading the filter cake by the sealing condition of the exposed surface connection of the hydraulic device.

5.6 Noise

The noise shall be tested, in accordance with the provisions of GB/T 10894.

5.7 Cleanliness of hydraulic system

The cleanliness of the hydraulic system is tested, in accordance with JB/T 6418.

5.8 Deviation of filter belt

For the filter press, which has a filter belt walking mechanism, the filter belt runs continuously for three cycles, at the maximum operating speed. For the mobile type endless filter belt, the deviation is measured, at the thrust plate and the compression plate, taking the maximum value. When the endless filter belt performs small cycles, the deviation is measured at the top, taking the maximum value.

5.9 Electrical control device

5.9.1 The insulation resistance test and withstanding voltage test of the

electrical control device shall be tested, in accordance with the test methods specified in GB 5226.1.

5.9.2

The electrical control device, which is used in the explosive gas environment, shall be tested, according to the test method specified in GB

3836.1.

5.10 Intergranular corrosion of stainless steel welds

The intergranular corrosion of austenitic stainless steel welds shall be tested, in accordance with the provisions of GB/T 4334.

5.11 Appearance quality (misalignment of filter plate)

The filter press is pressed at the rated pressing force; the reference line is drawn, based on the pressed wallboard and the thrust wallboard as the datum.

According to the principle of equal division, take measurements at five points of the adjacent filter plates (each plate is measured, when the number of plates is less than 10); calculate the misalignment deviation of the adjacent filter plates;

h - The depth of the filter chamber, in meters (m).

6.1 General

The inspection of filter press is divided into exit-factory inspection and type inspection.

6.2 Exit-factory inspection

6.2.1 Each product shall be inspected by the manufacturer and be accompanied by a certificate of conformity, before it can leave the factory.

Under special circumstances, the inspection can also be carried out, at the user site, according to the agreement between the manufacturer and the user.

6.2.2 Each filter press shall be subject to the exit-factory inspection. The filter press shall be inspected, in accordance with Table 3, when it leaves the factory.

6.3 Type inspection

6.3.1 Type inspection shall be carried out, in one of the following situations:

a) When the new product or the old product, after trans-plant production, is subject to trial type identification;

b) After formal production, if there are major changes in structure, materials, and processes, which may affect the product performance;

c) It shall be carried out once a year, during the formal production;

d) When the production is resumed, after suspension for more than 1 year;

e) There is a big difference between the exit-factory inspection results and the last type inspection;

f) The national quality supervision agency puts forward the request for type inspection.

6.3.2 The inspection shall be carried out, in accordance with the requirements of Table 3, during the type inspection.