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DL/T 742-2019: Quality standard of plastic parts for wet cooling tower
Status: Valid DL/T 742: Evolution and historical versions
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Basic data | Standard ID | DL/T 742-2019 (DL/T742-2019) | | Description (Translated English) | Quality standard of plastic parts for wet cooling tower | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K54 | | Classification of International Standard | 27.100 | | Word Count Estimation | 29,299 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 742-2019: Quality standard of plastic parts for wet cooling tower---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Quality standard of plastic parts for wet cooling tower
DL/T 996-2019
ICS 27.100
K 54
People's Republic of China Electric Power Industry Standard
Quality standard for plastic parts of wet cooling tower core
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 General...3
5 Technical requirements...3
5.1 Water spraying filler...3
5.2 Dewatering device...5
5.3 Splashing device...6
5.4 Water distribution pipe...7
5.5 Water spray filler bracket...8
6 Inspection...9
6.1 Water spray filler...9
6.2 Dewatering device...11
6.3 Splashing device...12
6.4 Water distribution pipe...13
6.5 Packing bracket...13
7 Packaging, marking, storage and transportation...14
Appendix A (Normative Appendix) Test Method for Longitudinal Shrinkage of Flat Sheets of Water-sprayed Filler...15
Appendix B (Normative appendix) Test method of cold-resistant temperature (tb) for low-temperature half-fold test of water spray filler...16
Appendix C (Normative Appendix) Humid and Hot Air Aging Test Method for Tower Core Plastic Parts...17
Appendix D (normative appendix) Test method for temperature resistance performance of water-sprinkling filler molding...18
Appendix E (Normative Appendix) Load Test Method for Water-sprinkling Packing Assembly Block...19
Appendix F (informative appendix) The spacing, mass number and arrangement of different types of water-sprinkling packing assembly blocks...20
Appendix G (Normative Appendix) Test method for the rate of change of the size of the eliminator arc...21
Appendix H (Normative appendix) Test method for breaking tensile force of tie rod of arc-shaped water separator...22
Appendix J (Normative Appendix) Test Method for Fracture Tensile Force of Support Plate of Arc Dewatering Device...23
Appendix K (Normative Appendix) Test Method for Deflection of Water Sprinkling Filling Bracket...24
Appendix L (Specification Appendix) Destructive Test Method for Splashing Plate (Ring) of Splashing Device...25
Appendix M (Normative Appendix) Sample Preparation of Tower Core Plastic Parts...26
Foreword
This standard is in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation"
Drafting.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard replaces DL/T 742-2001 "Quality Standard for Plastic Parts of Wet Cooling Tower Cores", and compares with DL/T 742-2001 except
The main technical changes besides editorial changes are as follows.
-Deleted the design, operation, and test related content that was duplicated with other industry standards in the original standard;
-Added the quality standard of the water-sprinkling filler bracket;
-Added the content of product quality inspection, acceptance, and quality standards, product packaging, marking, storage and transportation.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Plant Steam Turbine Standardization Committee.
Drafting organizations of this standard. Xi'an Thermal Power Research Institute Co., Ltd., Changzhou Jintan Plastic Factory.
The main drafters of this standard. Wang Mingyong, Jia Mingxiao, Hu Sanji, Han Li, Deng Jia, Jiang Xiaorong, Li Luozhong, Yu Bin.
This standard replaces DL/T 742-2001 "Technical Conditions of Cooling Tower Plastic Parts" from the date of implementation.
This standard was first issued in.2001, and this is the first revision.
The opinions or suggestions in the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Beijing Bai
No. 1, Er Tiao, Guang Road, 100761).
Quality standard for plastic parts of wet cooling tower core
1 Scope
This standard specifies the manufacturing, quality inspection, packaging, storage and transportation of wet cooling tower core plastic components.
The basic requirements.
This standard applies to polyvinyl chloride plastic film sprinkler fillers, water distribution pipes, water eliminators and wet cooling towers.
Splashing devices made of engineering plastics, fiber-reinforced plastic (glass reinforced plastic) water-sprinkling filler brackets and other plastic parts.
2 Normative references
The clauses in the following documents have become clauses of this part after being quoted in this standard. All dated reference documents are attached
All subsequent amendments (excluding errata content) or revised editions do not conform to this standard. However, it is encouraged to achieve
The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest version is suitable
Used in this standard.
GB/T 1033.1 Determination of the density of plastic non-foam plastics Part 1.Immersion method, liquid pycnometer method and titration method
GB/T 1040.1 Determination of tensile properties of plastics Part 1.General
GB/T 1040.3 Determination of tensile properties of plastics Part 3.Test conditions for films and sheets
GB/T 1633 Thermoplastics Determination of Vicat Softening Temperature (VST)
GB/T 1843 Determination of impact strength of plastic cantilever beam
GB/T 2406.1 Determination of Combustion Behavior of Plastics by Oxygen Index Method Part 1.Guidelines
GB/T 2406.2 Determination of combustion behavior of plastics by oxygen index method Part 2.Room temperature test
GB/T 2828.1 Sampling Inspection Procedures by Attributes Part 1.Batch-by-batch Inspection Sampling Retrieved by Acceptance Quality Limit (AQL)
GB/T 4219.1 Industrial Hard Ethylene (PVC-U) Piping System Part 1.Pipes
GB/T 6671 Thermoplastic pipe longitudinal shrinkage determination
Determination of the Vicat softening temperature of GB/T 8802 thermoplastic pipes and fittings
GB/T 8804.1 Thermoplastic pipe stretch performance determination Part 1.General test method
GB/T 8804.2 Thermoplastic pipe stretch performance determination Part 2.Unplasticized polyvinyl chloride pipe (PVC-U), chlorinated
Polyvinyl chloride (PVC-C) and high impact polyvinyl chloride (PVC-HI) pipes
GB/T 8806 Plastic piping system plastic parts size determination
GB/T 10002.1 Unplasticized polyvinyl chloride (PVC-U) pipes for water supply
GB/T 1446 General Principles of Test Methods for Performance of Fiber Reinforced Plastics
GB/T 1447 Test method for tensile properties of fiber reinforced plastics
GB/T 1449 Test method for bending performance of fiber reinforced plastics
GB/T 3854 Barcol (Barcol) hardness test method for fiber reinforced plastics
QB/T 2803 Method for measuring bending of rigid plastic pipe
QB/T 1130 Test method for right-angle tear performance of plastics
DL/T 933 Cooling tower water spray filler, water remover, spray device performance test method
3 Terms and definitions
The following terms apply to this standard.
3.1
Poly vinyl chloride plastics (PVC)
It is a material extruded with PVC resin and various additives.
3.2
Service life
Refers to the service life of the plastic parts in the cooling tower that can meet its technical and economic requirements under normal use conditions.
3.3
Flat packing chip
Flat plastic sheet used in thermoforming of plastic water filling filler, referred to as flat sheet.
3.4
Finished from packing chip
After the flat sheet is formed by hot pressing, it has a certain shape or wave shape and water spray filler.
3.5
Assembly lump
A certain number of fillers are formed into a laminated block assembled by bonding or through rods, or a certain number of eliminator arcs are used to support
A grid-shaped block connected by a tie rod between the plates.
3.6
Curved piece eliminators
Curved sheet material extruded by plastic.
3.7
Stand of eliminators
Used to support the components between the arcs of the eliminator.
3.8
Rod of eliminators
The plastic rod used to fix and connect the eliminator arc and the support plate.
3.9
Spray device
Water spray device, also called sprinkler. The cooling water can be sprayed into fine droplets.
3.10
Bracket
When the spray filler is placed in the cooling tower, it is used to support the frame of the spray filler.
3.11
Simple beam support
The supporting form in which the two ends of the assembly block rest on the strip support.
3.12
Trellis net support
The water spray packing adopts the support form of frame format support.
3.13
Suspension support
The support of the sprinkling filler is simply supported, and the supporting structure adopts a type of installation in which a boom is suspended on the sprinkling beam.
3.14
Factory test
In order to characterize product quality performance, inspection activities implemented on some basic inspection items of product quality before leaving the factory. This rule
The technical requirements in the section are all factory inspection items except for *.
3.15
Type test
It is a periodic assessment form for comprehensive inspection of product quality. The inspection items are the technical requirements of the product specified in this standard.
All items in the search. Under normal circumstances, the type inspection is at least once every two years. If there is one of the following conditions, it should be typed
test.
a) Trial type appraisal of new products or old products transferred to factories;
b) When major changes in structure, materials, and processes may affect product performance;
c) When the product resumes production after a long-term shutdown;
d) When there is a big difference between the factory inspection result and the last type inspection result;
e) When the national quality supervision agency proposes to conduct type inspection.
4 General
4.1 Before mass production of various plastic parts, their main technical performance indicators should be tested and verified in accordance with DL/T 933, and
Run the trial. Among them, the trial of the water-sprinkling packing should also be carried out on the industrial tower for the thermal performance assessment test. After the performance guarantee value is qualified
Can be used for promotion. Different types of water-sprinkling packing assembling blocks include the sheet spacing, the mass and phase of each cubic meter of the assembling block
See Appendix F for the bonding arrangement between adjacent sheets.
4.2 All kinds of plastic parts products must meet the following basic requirements during long-term production and operation.
a) No softening and deformation under the condition of water temperature 65°;
b) Not broken or brittle under the design minimum temperature;
c) It has sufficient rigidity, strength and good aging resistance. Under normal operating conditions, the geometry of various components
The shape, performance index and installation and connection should be kept stable for a long time. Water spray filler, water separator, water distribution pipe, water spray filler bracket
The service life should not be less than 20 years; the service life of the spray device should not be less than 12 years.
4.3 Under various ambient temperature conditions, the bonding and curing performance of the water-sprinkling filler adhesive should meet the requirements of the bonding assembly process. Bonding
The initial tensile shear bond strength at 2h after the agent is bonded shall not be less than 0.5MPa.
4.4 In addition to complying with this standard, all kinds of plastic parts should also comply with relevant national and industry regulations, norms and relevant regulations.
5 Technical requirements
5.1 Water spray filler
5.1.1 Water-sprinkling filler flat sheet
The flat sheet of water spray filler should meet the following requirements.
a) The flat sheet of water-sprinkling filler is made of PVC plastic. The flat sheet should be plasticized uniformly, without poorly dispersed auxiliary materials, and appearance color
It should be consistent, and there should be no oil stains on the surface.
b) The surface of the flat sheet should be smooth, without obvious holes, wrinkles and bubbles; there should be no impurities with a particle size greater than 1.0mm, the particle size is
The number of impurities of 0.6mm～1.0mm shall not exceed 20/m2, and the dispersion shall not exceed 5/(10cm×10cm). Edge
It should be smooth and straight, without cracks or gaps.
c) The thickness of the packing sheet should be 0.35mm～0.45mm, and the allowable deviation is 0.030.
d) The physical and mechanical properties of the filler sheet shall meet the requirements of Table 1.
5.1.2 Water-sprinkling filler molding sheet
The water-sprinkling filler molding sheet should meet the following requirements.
a) The 0.3mm～2.0mm holes on the formed sheet should not exceed 20/m2, and the dispersion should not exceed 5/(10cm×10cm),
And the damaged hole diameter should not exceed 2mm; the edge of the formed sheet should not be cracked or obviously notched; the surface should not be warped or arched.
b) The size of the formed sheet should meet the design requirements, the allowable deviation of the length of the sheet is ±10mm, and the allowable deviation of the width
±5mm; the contour of the film is a regular rectangle; the thickness of the thinnest part of the formed film should not be less than 0.2mm.
c) The molded sheet must be made of PVC flat sheet with qualified material index, and the physical and mechanical properties of the molded sheet shall meet the requirements in Table 2.
Regulations. See Appendix M for the sample preparation for the material test of the formed sheet.
d) After the formed sheet is immersed in 65℃ hot water for 72h, the rate of change between the two wave distances Mh≤5.0%. Temperature resistance
See Appendix D for the test method.
e) The sheet spacing (or hole spacing, wave spacing) of the formed sheet should meet the design requirements, and the deviation should not exceed ±0.5mm.
5.1.3 Water spray packing assembly block
The water spray packing assembly block shall meet the following requirements.
a) The spacing of the assembly blocks should meet the design requirements, and the allowable deviation is ±1.0mm. The adjacent surfaces of the assembly block should be perpendicular to each other to form
For a regular hexahedron, the plane formed by each edge should be flush. Bonding of bonding points between each piece inside the assembly block
It is firm, and there should be no virtual sticking or detachment. The effective bonding points between each piece are not less than 90% of the total number of bonding points between the pieces.
b) The assembly block should have sufficient rigidity. The standard specimen under the simply supported condition is supported under a uniform load of 3000N/m2.
The bearing surface and loading surface should have no obvious warping, lodging and other deformation phenomena, and the top lateral displacement should not exceed 50mm. Test party
See Appendix E for the method.
c) The rod-through assembly block should be equipped with sufficient plastic rods. The mechanical properties of the tie rod should comply with 5.2.3 The tie rod mechanics of the eliminator
Performance requirements.
d) The mechanical properties of the tie rod (rope) used for hoisting the assembly block should meet the design calculation requirements, and corresponding mechanical properties should be provided
testing report.
5.2 Dewatering device
5.2.1 Dewaterer arc
The eliminator arc should meet the following requirements.
a) The eliminator arc is extruded from PVC plastic. The appearance and color of the arc should be uniform, uniform plasticization, and no obvious color
Poor and overheated color.
b) The surface of the arc sheet should be smooth, smooth, free of cracks, holes and impurities. There should be no bubbles and particles with a diameter of more than 2mm
Impurities above 1mm in diameter. The number of bubbles less than 2mm in diameter and impurities less than 1mm in diameter shall not exceed 30
Pieces/m2, and the dispersion degree does not exceed 5 pieces/(10cm×10cm).
c) The edge of the arc is smooth, and the diversion section is flat and straight, and there must be no warped edges, nicks and cracks.
d) The geometric dimensions of the arcs must meet the design requirements of the plate. The contour of the film is a regular rectangle, and the arch height and width of the arc allow
The allowable deviation is ±1mm, and the allowable length deviation is ±2mm.
e) The thickness of the arc shall not be less than 1.2mm, and the allowable deviation of the thickness of the arc shall be 0.15mm -0.10mm.
f) The hole position of each arc piece must be accurate and consistent, and the deviation of the hole position between the arc pieces is ±1mm. The allowable deviation of the aperture is ±0.2mm.
g) The size and number of holes of the dewatering sheet, the number of dispersions, and the size of the damaged aperture of the bonded honeycomb-type dewatering device should comply with 5.1.2.
Regulations. The thickness of the water removal sheet shall not be less than 0.45mm.
5.2.2 Dewaterer accessories
The accessories of the eliminator should meet the following requirements.
a) The support plate of the eliminator has a smooth surface, uniform color, good plasticization, and no obvious bubbles, impurities, cracks, wrinkles, etc.
Sinking; the molding die closing line and overflow should be trimmed neatly, and no die closing ribs should be left around the hole; the support board has a regular appearance and no
Warpage, the shape and size meet the design requirements, the allowable deviation of the arch height is ±0.5mm; the allowable deviation of the center distance and hole length of the tie rod hole
The difference is ±0.5mm.
b) The tie rod has a smooth surface, uniform color and good plasticization; the tie rod shaft is straight and round, and the ellipticity is not more than 0.1mm;
The allowable deviation of tie rod diameter is ±0.1mm, and the allowable deviation of length is ±3mm; the thread size is accurate; each nut processing ruler
The size should meet the design requirements and cooperate well with the screw.
5.2.3 Material of eliminator
The material of the eliminator should meet the following requirements.
a) The physical and mechanical properties of the eliminator arc should meet the requirements of Table 3.
5.3 Splashing device
5.3.1 General technical requirements
The general technical requirements of the spray device are as follows.
a) The spray device is injection molded from ABS plastic. The surface should be smooth, well-plasticized, regular in shape, and consistent in color.
There are cracks, holes, bubbles, pits and obvious impurities.
b) The size of each component should meet the product design requirements. The size and angle of the splash element must be accurate, and the nozzle outlet diameter
The allowable deviation is ±0.3mm.
c) The threaded connections should be well matched, moderately tight, and free to advance and retreat.
d) Nested movable nozzles of different calibers should be distinguished by different colors.
5.3.2 Physical and mechanical properties
The destructive power of different types of spray devices of ABS material shall meet the requirements of Table 4.
5.3.3 The material density value of the ABS spray device shall not be greater than 1.05g/cm3.
5.4 Water distribution pipe
5.4.1 General technical requirements
The general technical requirements for water distribution pipes are as follows.
a) The water distribution pipe is extruded from UPVC plastic. The appearance should be consistent in color, uniform in plasticization, and smooth and flat inner and outer walls. Must not
There are defects such as bubbles, cracks and obvious scratches, depressions, protrusions, impurities, and discoloration lines at the boundary.
b) The cutting surface of the pipe end should be flat and perpendicular to the pipe axis.
c) The axial allowable curvature of the pipe should be less than 0.5% of the length. The bends must be in the same direction and must not show an S-shaped bend. Curvature
Determined in accordance with QB/T 2803.
5.4.2 Specifications and dimensions of the water distribution pipe
The specifications and dimensions of the water distribution pipe are as follows.
a) The allowable deviation of pipe length L is 20mm -10mm. The length of the pipe does not include the depth of the socket, and the scale is 1mm
Steel tape measure.
b) The deviation of the nominal outer diameter, nominal wall thickness, and average outer diameter and wall thickness of PVC pipes under general use conditions should conform to Table 5.
Provisions.
5.4.3 Material of water distribution pipe
The physical and mechanical properties of the water distribution pipe should meet the requirements of Table 7.
5.5 Water spray filler bracket
5.5.1 General technical requirements
The general technical requirements for the water spray filler bracket are as follows.
a) The outer surface of the bracket should be smooth, no cracks, no degumming, no obvious impurities, uniform color, and no surface
There are bubbles.
b) The geometric shape of the water spray packing bracket should be regular and meet the design requirements.
c) The spacing between the I-shaped parts of the assembly block of the water spray filler bracket should not be greater than 250mm, and the spacing between the connecting rods should not be greater than 400mm. I
The equivalent diameter of the connecting rod between pieces shall not be less than 15mm. The connecting rod and the I-shaped part must be sealed with synthetic resin.
d) The specifications, dimensions and allowable deviations of the I-shaped parts of the water-sprinkling filler bracket should meet the requirements of Table 8.
5.5.2 The physical and mechanical properties of the water-sprinkling filler bracket I-piece shall meet the requirements of Table 9.
5 Density ρ g/cm3 ≤2.0 GB/T 1033.1
5.5.3 The deflection of the water-sprinkling filler bracket assembly block under the conditions of uniformly distributed load and a clear spacing of 1.0m shall meet the requirements of Table 10.Water filling
Refer to Appendix K for the deflection test method of the material bracket under uniform load conditions.
6 Inspection
6.1 Water spray filler
6.1.1 Batch
The acceptance of water spray filler is based on batch. Flat sheets and their formed sheets that are continuously produced with the same raw material, formula, specifications and process
The assembly block is a batch, and the quantity of each batch shall not exceed 30t.
6.1.2 Sampling
The sampling requirements for spraying filler are as follows.
a) The inspection of the appearance and specifications of the water-sprinkling filler flat sheet is based on "roll", and the general inspection specified in GB/T 2828.1
Inspection level IL=I, qualified quality level AQL=6.5, normal single sampling plan.
b) The inspection of the appearance and specifications of the water-sprinkling filler molding sheet is based on "sheets", and the special specified in GB/T 2828.1
Inspection level S-4, qualified quality level AQL=6.5, normal sampling plan.
c) The inspection of the specifications and assembly process of the water-sprinkling packing assembly block is based on "blocks" and adopts the requirements specified in GB/T 2828.1
General inspection level IL=I, qualified quality level AQL=6.5, normal sampling plan.
6.1.3 Inspection and judgment rules for flat sheets of water-sprinkling filler
The inspection and judging rules for water-sprinkling filler flat sheets are as follows.
a) The performance indicators of this batch of water-sprinkling filler flat sheets shall meet all the technical requirements specified in 5.1.1.
b) The appearance and specifications of the water-sprinkling filler flat sheet should meet the requirements of 5.1.1a) ~ c). On each random inspection roll (outside the title)
Take 1m2 inspection. Any product that does not meet any of the above requirements is considered a non-conforming product. Various batches of inspection batch according to Table 11
The specified sampling quantity and discrimination criteria shall be subject to random inspection.
c) The physical and mechanical properties of the PVC filler sheet should meet the requirements of Table 1.Take one roll from each batch of flat films during acceptance
In material performance inspection, as long as one index fails to meet the requirements, double sampling should be taken from the original batch of flat films.
If the result of the re-inspection is still unqualified, the material of the batch of sheets will be judged as unqualified. Among them, low temperature fold te...
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