GB/T 36051-2018Gas filter (English PDF)

3.1 Terms and definitions

The following terms and definitions apply to this document.

3.1.1 Gas filter

Separation of debris (dust, rust and other debris) entrained in the gas stream to protect downstream pipeline equipment from damage, contamination, and blockage Pieces. Referred to as a filter.

3.1.2 Quick open blind

A mechanical device for the opening of the cylinder of the filter that can be quickly opened or closed.

3.1.3 Quick open door filter

The barrel is welded with a quick-opening blind plate, a filter that can quickly open and close the sealing lock, and has a safety interlock function.

3.1.4 Design pressure

Under the corresponding design temperature conditions, it is used to determine the pressure value of the filter to calculate the wall thickness and other component sizes.

Note: The unit is MPa (MPa).

3.1.5 Nominal pressure

A numerically indicated pressure-related designation code used to represent the filter flange, which is a circular integer.

3.1.6 Filter nominal size

The size of the filter inlet, used to indicate the size of the filter.

3.1.7 Filter material

A material that separates dust and impurities from a gas filter.

3.1.8 Filter element

The replaceable part in the filter consists of the filter material and its support.

3.1.9 Filtration area

The filter element serves as the surface area of the filter material for filtration.

3.1.10 Filtration efficiency

The ability of a filter or filter to capture specific test particles.

Note: When using the counting method, it refers to the ratio of the difference between the aerosol count concentration in the upstream and downstream airflow of the filter or filter element and its upstream counting concentration, also called the counting effect rate; when tested by the weight method, it refers to the ratio of the amount of dust collected by the filter or filter element to the amount of dust generated, also known as the weight efficiency. Expressed as a percentage (%).

3.1.11 Particle size

The nominal diameter of the particles obtained is measured in some way.

Note: The unit is micrometer (µm).

3.1.12 Filtration accuracy

The particle size of the smallest particle that the filter can capture if it meets effective filtration efficiency (filtration efficiency >= 99.9%).

Note: The unit is micrometer (µm).

3.1.13 Resistance

The static pressure difference between the filter or the filter element as it passes through the filter or filter element.

Note: The unit is Pa (Pa).

3.1.14 Initial resistance

At rated flow, the static pressure difference when the airflow passes through the filter element as a new filter element.

Note: The unit is Pa (Pa).

3.1.15 Final resistance

At the rated flow rate, when the airflow passes through the filter element, the resistance of the filter element rises due to dust accumulation, and the static pressure difference reached is specified.

Note: The unit is Pa (Pa).

3.1.16 Maximum allowable resistance

The maximum differential pressure that the filter element can withstand without damage.

Note: The unit is Pa (Pa).

3.1.17 Dust capacity

The total mass of test dust captured by the tested filter at the final resistance at the rated throughput.

Note: The unit is gram (g).

3.1.18 Surface filtration rate

The speed at which the airflow passes through the filter layer.

Note: The unit is meters per second (m/s).

3.1.19 Test speed

The ratio of the gas volume flow to the inlet side surface area of the filter element during the test.

Note: The unit is meters per second (m/s).

3.1.20 Rated flow rate

The maximum volumetric flow rate of the gas processed by the filter per unit time.

Note: The unit is cubic meters per hour (m3/h).

3.1.21 Test dust

This standard is used to simulate a mixed dust source of impurities present in gas pipelines.

3.1.22 Dust generator

The test dust is vented to the air to form a relatively uniform dispersion system according to certain requirements.

3.1.23 End filter

A filter used to capture test dust that passes through the filter under test.

3.1.24 Correlation coefficient

The ratio of the particle concentration of the downstream and upstream sampling systems in the case where the test system does not have the filter element tested and maintains a stable aerosol concentration.

3.1.25 Isometric sampling

When sampling in a pipe, the inlet pipe airflow velocity is the same as the pipe velocity at the pipe sampling point.

3.2 Abbreviations

The following abbreviations apply to this document.

A2 dust. ISO 12103-1-A2 fine particle test dust

A4 dust. ISO 12103-1-A4 grade coarse test dust

CPC. condensation particle counter (condensation particlecounter)

DEHS. Di-ethyl-hexyl-sebacate

OPC. Optical Particle Counter (optical particle counter)

4.1 Classification

Filters can be classified as follows.

--- According to the structure type can be divided into. Y type (Y), angle type (J), cylinder type (T);

--- According to the installation type can be divided into. vertical (V), horizontal (H);

--- According to the interface end face type. threaded connection, welded connection and flange connection;

--- According to the shell material is divided into. carbon steel, low alloy steel, stainless steel, cast iron, copper and copper alloy, aluminum alloy;

--- According to the working mode can be divided into. ordinary type, quick opening type (K);

--- According to the number of filter elements can be divided into. single filter, multi-filter (D);

--- According to the filtration accuracy can be divided into. 0.5µm, 2µm, 5µm, 10µm, 20µm, 50µm, 100µm;

--- According to the working temperature range can be divided into. Class I -10 °C ~ 60 °C, Class II -20 °C ~ 60 °C;

--- According to the maximum allowable working pressure can be divided into. 0.01MPa, 0.2MPa, 0.4MPa, 0.8MPa, 1.6MPa, 2.5MPa, 4.0 MPa, 6.3 MPa, 10.0 MPa.

4.2 Code

4.2.1 The filter structure type code is as specified in Table 1.

4.2.2 The end face type code of the filter interface is as specified in Table 2.

4.2.3 Filter housing material code is shown in Table 3.

4.3 Model

4.3.1 Model preparation

Modeling is done in the following format.

4.3.2 Model Example

The structure type is T-type DC type (the cylinder is welded with steel pipe), the nominal size is DN100, the nominal pressure is 1.6MPa, and the filter is fine. The degree is 5µm, the shell material is carbon steel, the end face of the joint is flanged, the flange sealing surface type is concave, and the installation method is horizontal and multi-filter. Gas filter, expressed as. RGLTIII100-16-5C/FM-HD.

5.1 General requirements

5.1.1 The filter housing may be cast, forged or welded, and the end connections may be flanged or welded end connections.

5.1.2 The filter shall have sufficient strength and rigidity to be considered to withstand the tensile, compressive and bending loads of the pipe, when the support is provided, The support should have sufficient strength, rigidity and stability.

5.1.3 The material of the filter housing should be selected according to its design pressure, working temperature, working medium and material properties, and should comply with the current national The relevant standards. The arrangement of the filter components should be reasonable in structure, convenient in maintenance, easy to operate and low in resistance loss.

5.1.4 The basic process configuration of the filter should include the following.

a) the filter body comprises a casing, a filter element and an accessory;

b) necessary support, such as support;

c) Valves, instruments and other related equipment.

5.1.5 Filter The filter material support shall have sufficient strength to withstand the specified load of the design and shall not cause abnormal deformation.

5.1.6 Filter cartridges, seals and other accessories should have sufficient mechanical strength and chemical stability, compatible with the operating temperature range, and combustion The gas medium is compatible and resistant to corrosion by gas odorants and gases permitted in gas.

5.2 Structure

5.2.1 Inlet and outlet connection types

The connection type of the filter with its upstream and downstream pipelines shall meet the following requirements.

a) Flange end. Steel pipe flange structure size and sealing surface type shall comply with HG/T 20592, HG/T 20615, HG/T 20623, NB/T 47020~NB/T 47023, GB/T 9113 and GB/T 13402 and other standards; cast iron pipe flange structure size And sealing surface type should meet the requirements of GB/T 17241.6 and GB/T 17241.7; copper alloy pipe flange structure size and sealing The surface type should meet the requirements of GB/T 15530.1 and GB/T 15530.8. Ferrite, copper and aluminium filters with flanges and shells The body should be cast or forged into a whole;

b) Pipe thread. only for filters with nominal size less than or equal to DN50, and shall comply with GB/T 7306.2 or GB/T 12716 Provisions;

c) Welding end. It should meet the requirements of GB/T 12224.

5.2.2 Maximum allowable working pressure, nominal size and nominal size of the cylinder

5.2.2.1 The maximum allowable working pressure of the filter is 0.01MPa, 0.2MPa, 0.4MPa, 0.8MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.3MPa, 10.0MPa are selected.

5.2.2.2 The inlet and outlet flanges of the filter should adopt the same nominal pressure and size. The nominal pressure of the flange should not be less than that of the filter housing design pressure.

5.2.2.3 The nominal size of the filter inlet connection should be 15mm, 20mm, 25mm, (32)mm, 40mm, 50mm, (65)mm, 80mm, 100mm, 125mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 500mm, 600mm selection.

5.2.2.4 The size of the filter cylinder refers to the nominal diameter. For the filter made of seamless steel pipe, the filter shall comply with the provisions of HG/T 20553; For steel plate rolled filters and quick-opening filters, it shall comply with the provisions of GB/T 9019.

5.2.3 Structural dimensions

5.2.3.1 The size of the filter structure shall comply with the provisions of Appendix A.

5.2.3.2 The structural dimensions of other pressure grades and other types of filters shall be determined by the manufacturer and their performance shall comply with the requirements of this standard.

5.2.4 Structural Dimensional Tolerance

5.2.4.1 The thread size tolerance of the threaded filter interface shall comply with the provisions of GB/T 7306.2 or GB/T 12716.

5.2.4.2 Flange-connected filter flanges shall have dimensional tolerances in accordance with HG/T 20592, HG/T 20615, HG/T 20623, NB/T 47020~NB/T 47023, GB/T 9113, GB/T 13402, GB/T 17241.7 and GB/T 15530.8 Provisions.

5.2.4.3 See Appendix B for the main dimensional tolerances and position tolerances of the filter. The unfilled position tolerance shall comply with the requirements of GB/T 1184 K. Unlinear tolerances shall comply with the requirements of GB/T 1804 m.

5.2.5 Minimum wall thickness of the casing

The minimum wall thickness of the housing should meet the following requirements.

a) The minimum wall thickness of the threaded iron and copper filter housings shall comply with the requirements of Table 4 of GB/T 8464-2008;

b) The minimum wall thickness of the flanged copper filter housing shall comply with the requirements of Table 1 of QB/T 4507-2013;

c) The minimum wall thickness of the shell of the cast steel flange filter shall comply with the provisions of GB/T 26640; […]