HG/T 21556.2-1995 Stainless steel ball ring packing HG/T21556.2-1995 standard download decompression password: www.bzxz.net

Stainless steel ball ring packing
HG/T 21556.2-95
1 Subject content and scope of application
1.0.1 This standard specifies the structural dimensions, manufacturing, inspection, packaging, storage and transportation requirements of stainless steel ball rings with packing diameters of 16, 25.38 and 50.76 mm. 1.0.2 The applicable temperature range of stainless steel ball ring packing is less than or equal to 400℃. 7.5
GB3280
GB1184
GB 1804
Referenced standards
《Stainless steel cold wheel steel plate》
《Provisions for shape and position tolerances without tolerances》《Limit deviations of tolerances and fits without tolerances》《Dimensions, shape, weight and allowable deviations of cold-rolled steel plates and strips》3
Marking, specifications and characteristics
X XX.XXX -PRSS-X X
Nominal diameter
Stainless steel ball ring
Standard number
3.2 Specifications and characteristicsbZxz.net
3.2.1 The ball ring is a cylinder with a height equal to the diameter and a number of windows on the surface. As shown in Figure 3.2.1.
Figure 3.2.1 Stainless steel ball ring
In the figure: the unit of size is mm; D-
-diameter; H
-height; ——wall thickness.
3.2.2 Diameter series: The nominal diameters of the ball rings commonly used in industry are DN16, DN25, DN38, DN50, and DN76mm.
The specifications and dimensions of stainless steel ball ring packing are shown in Table 3.2.3. Specifications and dimensions of stainless steel ball ring packing
0.3±0.05
0.5±0.05
0.6±0.07
0.8±0.07
1.2±0.10
Ovality deviation
Not more than
The geometric dimensions and characteristic parameters of stainless steel ball ring packing shall comply with the requirements of Table 3.2.4. Table 3.2.4 Characteristics of stainless steel ball ring packing Parameters Diameter × height × wall thickness Number of stacking
Stacking density
Specific surface area
76×76×1.2
50×50×0.8
38X38×0.6
25×25×0.5
16×16×0.3
214000
(kg/m2)
(m*/m2)
Porosity
(m*/m2)
For packing factor
4 Materials
4.0.1 The selection of stainless steel materials shall comply with the technical requirements specified in GB3280. 4.0.2 The size, shape, weight and allowable deviation of the selected stainless steel plates and steel strips shall be in accordance with the B-level precision specified in GB708.
4.0.3 The selected materials must have a finished product certificate and a chemical composition report of the material. 4
Manufacturing requirements
5.0.1 The manufacturing dimensions of stainless steel ball rings are shown in Figure 5.0.1 and Table 5.0.1. AE
BABABALBALBE
Figure 5.0.1 The manufacturing dimensions of stainless steel ball ring packing are shown in
Figure: The unit of size is mm; A—window hole spacing; B. Window length, H, --- width H2———window width; H—upper and lower row window hole spacing, E, F—length, wall thickness, RR—D diameter; H—height; L—expanded length. 80
一Curvature radius:
5.0.1 Stainless steel ball ring production size table B
35.511.18.514.016.016
.59.012.d
5.0.2 The stamping processing accuracy shall be implemented according to the IT13 grade in the GB1804 standard and the B grade accuracy in the GB1184 standard.
The gap of the packing ring joint shall be less than 0.4mm for the three types of packings of DN16, DN25 and DN38mm; and less than 0.8mm for the two types of packings of DN50 and DN76. The upper and lower edges of the packing are not allowed to be misaligned. The end face of the packing ring shall be perpendicular to the axial center line and 90° with the side. 5.0.4 There shall be no cracks on the surface of the packing ring and no burrs on the edge of the packing. 81
Inspection and acceptance
6.1 Acceptance rules
6.1.1 The packing should be inspected in batches, and packing of one size can be regarded as a batch. See Table 6.1.1 for batches. When the production volume of packing of one size is less than the batch value specified in Table 6.1.1, the production volume of one size can be regarded as a batch.
Table 6.1.1 Packing batches
Nominal diameter DN
Less than 38
Batch (m2)
6.1.2 The sampling quantity of each batch of packing shall not be less than 60 samples for testing. 6.1.3 If more than 5% of the sample size of the appearance dimensions of the samples do not meet the requirements of this standard, the sampling quantity shall be doubled from the same batch of products and retested. The results of the repeated tests apply to the same batch of products. If the unqualified rate of the retested samples is still greater than 5% of the sampling quantity, the batch of products shall be unqualified. 6.2 Inspection method
6.2.1 The diameter, wall thickness and height of the packing are measured with a vernier caliper. Each measurement item of each sample shall not be less than 2 measurement points. The measurement value requirements are shown in Table 3.2.3.6.2.2 Measure the ovality of the sample with a vernier caliper. Two mutually perpendicular diameters must be measured for each sample, and the ovality is determined by the radial difference between the two mutually perpendicular diameters. The measurement value requirements are shown in Table 3.2.3.6.2.3 Place the right angle meter on the end face of the packing, and use a feeler gauge to measure the gap between the right angle meter and the edge of the end face to measure the side tilt deviation. The verticality deviation should be less than 1%. 6.2.4 When the shape and size of the packing changes, it is necessary to conduct tests on the packing characteristics, fluid mechanics and mass transfer performance. 82
7 Marking, packaging and storage and transportation
7.1 Marking
7.1.1 The packing should be accompanied by a packing list and a product certificate. The soil should indicate: product name, specification and size, inspection results, inspection date and inspector's seal, manufacturer name, production date. 7.1.2 The outer packaging box should indicate: product name, quality (or quantity), manufacturer name, and words or signs such as "Prevent moisture" and "Do not press heavily". 7.2 Packaging
7.2.1 The packaging container should be a dry box or other packaging material. Lined with moisture-proof paper or other moisture-proof materials.
7.2.2 The packaging container must have sufficient strength to withstand multiple handling and loading and unloading, and be safely and reliably transported to the destination.
Transportation and storage
7.3.1 The product should be protected from rain and moisture during transportation. 7.3.2 The product should be stored in a dry and non-corrosive place. It must not be stored if the inner packaging is damaged.
Additional Notes: Proposal unit, chief editor unit and main drafters of this standard
Proposal unit: Chemical Engineering Design Technology Center Station, Ministry of Chemical Industry Chief editor unit:
Chemical Engineering Design Technology Center Station, Ministry of Chemical Industry Chief editor: Yu Hongshou Lin Jie
Reviewer:
Approval person:
Xiao Chengji Tan Chong Fei Weiyang
Li Chunfang
Wang Fuhua
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