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GB/T 17457-2019: Ductile iron pipes and fittings - Cement mortar lining
Status: Valid GB/T 17457: Evolution and historical versions
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Ductile iron pipes and fittings - Cement mortar lining
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GB/T 17457-2019
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| GB/T 17457-2009 | English | 319 |
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Ductile iron pipes and fittings -- Cement mortar lining
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| GB/T 17457-1998 | English | 359 |
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Ductile iron pipes--Centrifugal cement mortar lining--General requirements
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PDF similar to GB/T 17457-2019
Basic data | Standard ID | GB/T 17457-2019 (GB/T17457-2019) | | Description (Translated English) | Ductile iron pipes and fittings - Cement mortar lining | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29%H48 | | Classification of International Standard | A29; H48 | | Word Count Estimation | 10,191 | | Date of Issue | 2019-12-10 | | Date of Implementation | 2020-07-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 17457-2019: Ductile iron pipes and fittings - Cement mortar lining---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.
Ductile iron pipes and fittings--Cement mortar lining
ICS 25.220.99; 23.040.10
A29; H48
National Standards of People's Republic of China
Replaces GB/T 17457-2009
Ductile iron pipes and fittings cement mortar lining
(ISO 4179..2005, Ductileironpipesandfittingsforpressureand
non-pressurepipelines-Cementmortarlining, MOD)
2019-12-10 release
2020-07-01 implementation
State Administration of Market Supervision
Published by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 17457-2009 "Cement Mortar Lining for Ductile Iron Pipes and Fittings", which is equivalent to
The main changes are as follows.
--- Modify the nominal value and minimum value of DN40 ~ DN300 lining thickness, modify the maximum crack width and radial displacement; increase
Lining thickness, maximum crack width and radial displacement of DN2800 and DN3000 (see Table 1);
--- Increased crack width measurement (see 5.3);
--- Added test requirements for type tests and chemical resistance, abrasion resistance (see Chapter 7).
This standard uses the redrafting method to modify and adopt ISO 4179..2005 "Nodular cast iron pipes and fittings for pressure and non-pressure pipelines.
Mud Mortar Lining.
Compared with ISO 4179..2005, this standard has more structural adjustments.Appendix A lists this standard and ISO 4179..2005 chapters.
Comparison table of bar number changes.
There are technical differences between this standard and ISO 4179..2005.The clauses related to these differences have passed the margins on the outer margins.
The installed vertical single line (︱) is marked, and a list of the technical differences between this standard and ISO 4179..2005 and their causes is given in Appendix B.
for reference.
The following editorial changes have been made to this standard.
--- Change the standard name to "Cement Mortar Lining for Ductile Iron Pipes and Fittings".
This standard is proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Xinxing Casting Pipe Co., Ltd., Saint-Gobain Pipeline System Co., Ltd., Metallurgical Industry Information Standards Research Institute, China
Metallurgical Research Institute Co., Ltd.
The main drafters of this standard. He Qishu, Wang Enqing, He Gen, Shen Yong, Wang Song, Sun Shu, Hou Jie, Wang Junchang, Mu Junhao, Zhou Yan, Zhao Yingjie.
The previous versions of the standards replaced by this standard are.
--- GB/T 17457-1998, GB/T 17457-2009.
Ductile iron pipes and fittings cement mortar lining
1 Scope
This standard specifies the cement mortar lining of ductile iron pipes and fittings in GB/T 13295-2019 and GB/T 26081-2010.
Materials, coating methods, lining thickness and surface condition, and corresponding test methods.
This standard is applicable to improve the hydraulic properties of ductile iron pipes and fittings (compared with non-lined ductile iron pipes and fittings) and anticorrosive performance.
The inner lining also gives the special requirements for the non-full-flow artesian sewage pipeline lining.
This standard is also applicable to the lining for transporting special corrosive liquids.At this time, the following methods can be used alone or in combination.
--- Increase the thickness of the lining;
--- Change the type of cement;
--- Lining surface coating.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB 175 General Portland Cement
GB/T 201 Aluminate cement
GB/T 748 sulfate resistant portland cement
GB/T 13295-2019 Ductile iron pipes, fittings and accessories for water and gas (ISO 2531..2009, MOD)
GB/T 14684 Construction sand
GB/T 17219 Safety Evaluation Standards for Drinking Water Distribution Equipment and Protective Materials
GB/T 17671 Cement mortar strength test method (ISO method) (GB/T 17671-1999, idt ISO 679. 1989)
GB/T 26081-2010 Ductile iron pipes, fittings and accessories for sewage (ISO 7186..1996, MOD)
GB/T 32488 Ductile iron pipe and fittings cement mortar lining sealing coating (GB/T 32488-2016, ISO 16132.
(2004, MOD)
3 Materials
3.1 Cement
3.1.1 The cement used for lining of ductile iron pipes and fittings shall comply with the corresponding national standards according to its type. General Portland cement (including ordinary
Portland cement, slag portland cement, etc.) should meet the requirements of GB 175, aluminate cement should meet the requirements of GB/T 201, and be resistant to sulfuric acid
Salt Portland cement should meet the requirements of GB/T 748.
3.1.2 Unless otherwise specified, the type of cement used shall be given due consideration by the manufacturer in Appendix G of GB/T 13295-2019 and
On the basis of GB/T 26081-2010 Appendix D, the fluid that is determined to be suitable for transportation can also be determined by the supply and demand parties through consultation.
3.2 Sand
3.2.1 Sand is composed of inert, hard, solid and stable particles. Sand should be clean and have a controlled particle size distribution from fine to coarse. sand
The particle size curve shall meet the lining coating method, lining thickness, and surface condition requirements of Chapter 6.
3.2.2 Cleanliness shall be assessed according to the organic matter content and mud content in the sand.The organic matter content and mud content shall be inspected as follows.
--- Sampling should meet the requirements of GB/T 14684;
--- According to the requirements of GB/T 14684, the colorimetric method is used to test the content of organic matter.The sand should not produce any deeper than the standard solution.
Discoloration;
--- Determining the mud content of sand according to the requirements of GB/T 14684. Particles with a particle size of less than 75 μm in the sand do not have a mass fraction of
Should exceed 2% of total sand.
3.3 Preparation of water
3.3.1 The water used for preparing the mortar can be drinking water, or it can be both harmless to the mortar and harmless to the water transported in the pipeline.
3.3.2 If these requirements are met and current national health requirements are met, even solid mineral particles in the water are allowed.
3.4 Mortar
3.4.1 The mortar used for the lining should be made of cement, sand and water, where the cement meets the requirements of 3.1 and the sand meets the requirements of 3.2.
Water meets the requirements of 3.3.
3.4.2 If additives are used, the following conditions shall be met.
--- Additives should not endanger the quality of the lining and the quality of the transported water;
--- The lining still meets all the requirements of this standard;
--- The lining of the pipeline used to transport domestic drinking water should meet the requirements of GB/T 17219.
3.4.3 By mass, the mortar should be composed of at least 1 part of cement and 3.5 parts of sand (ie, the mass ratio S/C≤3.5).
3.4.4 In order to meet the requirements of this standard, the ratio of sand to cement (S/C) and water to cement (W/C) should be selected and controlled by the manufacturer.
S/C and W/C measurement methods shall be specified by the manufacturer.
4 Liner coating
4.1 Requirements for substrate surface before coating
4.1.1 All foreign objects, loose iron scales or any other material that may damage the good bonding between the metal and the liner should be removed from the surface of the substrate to be coated
The substance.
4.1.2 The height of the metal protrusions on the inner surface of ductile iron pipes and fittings shall not be greater than 50% of the thickness of the lining.
4.2 Coating method
4.2.1 Cement mortar should be mixed uniformly to achieve proper viscosity and uniformity.
4.2.2 For ductile iron pipes, the mortar can be coated on the inner wall by centrifugation or sprayed with a rotary spray head. The coating method is produced by the manufacturer.
Decide.
4.2.3 For pipe fittings, a rotary spray head can be used to spray on the inner wall or apply by hand.
4.2.4 Except for the inner surface of the socket, nodular cast iron pipes and fittings in contact with the conveyed water shall be completely covered with mortar.
4.2.5 During the coating process, the viscosity of the mortar, the time and speed of centrifugal coating, the rotation speed and translation speed of the nozzle should be controlled
So that the lining is tight and continuous. There should be no cavities or visible air bubbles in the mortar.
4.3 Maintenance
The freshly coated mortar should be cured in an environment above 0 ° C. The moisture of the mortar should be evaporated as slowly as possible to avoid poor hardening,
This can be done by controlling the ambient temperature, sealing the ports of ductile iron pipes, or covering the wet lining with a sealing layer. Conservation
Conditions shall be such that the lining is sufficiently hardened and the hardened lining meets the requirements of Chapter 6.
4.4 Sealing coating
4.4.1 When the surface of the cement mortar lining is coated with a sealing coating, the sealing coating should not affect the quality of the water being transported. If the delivery is drinking
Water should meet the requirements of GB/T 17219.
4.4.2 The sealing coating used shall meet the requirements of GB/T 32488.
4.5 Patch
4.5.1 Repair of damaged or defective parts is allowed. Repair should be carried out in accordance with the operating procedures of the manufacturer. Should be repaired first
The damaged mortar is removed from the area, and then the new mortar is repaired to the defective area with a suitable tool in order to get the joint again.
Continuous, consistent thickness lining.
4.5.2 The mortar used for repair should have a suitable consistency; if necessary, additives can be added to make the repair mortar and the edge of the undamaged mortar
The edges are sticky and firm.
4.5.3 The repaired parts shall be adequately maintained.
5 Lining thickness
5.1 Thickness requirements
5.1.1 Table 1 gives the nominal and minimum values for the thickness of the lining. The lining thickness at any point measured on the ductile iron pipe lining shall not
Less than the minimum values given in Table 1.
5.1.2 For non-full-flow sewage pipelines, it is advisable to increase the lining thickness and/or use high alumina cement mortar, polymer modified mortar or suitable mortar table.
The top coat is sealed.
5.1.3 The lining at the pipe end may be below the minimum lining thickness. The chamfer length should be as short as possible, and in no case should it be longer than
50mm.
Table 1 Thickness of cement mortar lining in millimeters
Nominal diameter of DN group
Lining thickness
Minimum nominal value
Maximum crack width and radial displacement
(drinking water)
Crack width (non-full flow
(Sewage pipeline)
Ⅰ DN40 ~ DN300 4.0 2.5 0.4 0.4
Ⅱ DN350 ~ DN600 5.0 3.0 0.5 0.5
Ⅲ DN700 ~ DN1200 6.0 3.5 0.6 0.6
Ⅳ DN1400 ~ DN2000 9.0 6.0 0.8 0.8
Ⅴ DN2200 ~ DN2600 12.0 7.0 0.8 0.8
Ⅺ DN2800, DN3000 15.0 9.0 0.8 0.8
5.2 Thickness measurement
5.2.1 The thickness of the lining can be measured by inserting steel needles into the newly-coated mortar, and non-destructive testing can also be used to measure the hardening
After the mortar.
5.2.2 The thickness of the lining shall be measured at both ends of the ductile iron pipe, and each end shall be measured at least on a cross section perpendicular to the axis.
5.2.3 Each section shall be at least.200 mm from the pipe end, and four points at 90 ° intervals shall be taken for measurement.
5.2.4 The measured value of lining thickness shall be accurate to 0.1mm.
5.3 Crack width measurement
The crack width should be measured with a transparent point and wire gauge. The point and wire gauge has a width of 0.03mm to 1.5mm.
6 Surface condition of hardened lining
6.1 The surface of the cement mortar lining should be flat, allowing isolated sand grains to be firmly embedded in the surface of the lining. Lining structure, surface condition and coating
The surface condition (such as orange peel shape) produced by the production method is acceptable, but it should not make the thickness of the lining at a certain point
Lower than the minimum value in Table 1.
6.2 For centrifugally coated linings, a thin layer of cement-enriched float slurry is formed on the surface by cement and fine sand.This thin layer accounts for about the total thickness of the mortar.
1/4.
6.3 Due to the complicated internal shape of the fittings and the spraying process (rotary nozzle), the lining surface of the fittings is allowed to corrugate, but should not
Make the thickness of the lining at a certain point lower than the minimum value in Table 1.
Note. The surface condition of the lining has little effect on the hydraulic characteristics. The main factors affecting the hydraulic characteristics are the effective inner diameter of ductile iron pipes and the shape of the fittings.
6.4 In the case of shrinkage of the lining, radial displacement and crack formation are inevitable (see Figure 1). These cracks and radial displacements, along with
For other individual cracks caused by production or transportation, the width should not exceed the requirements of Table 1. Cracks will not line the machine
Mechanical stability has an adverse effect.
Note. When the lining comes in contact with water, these cracks and radial displacement will shrink and close as the lining expands again and the hydration reaction of the cement.
6.5 In dry and hot climates, the cavity formed by the shrinkage of the lining is allowed to exist, and can be checked by listening to the sound (such as tapping).
Note. The cavity will disappear when the lining comes in contact with water.
Explanation.
a --- radial displacement;
b --- lined surface;
c --- cement lining.
Figure 1 Radial displacement caused by cracks in the cement mortar lining
7 other
7.1 General
In any of the following cases, the type test should be carried out in accordance with 7.2, 7.3, and 7.4.
--- When there is a major change in the raw materials of cement or sand;
--- When major changes in the coating process or equipment may affect product performance.
7.2 Compressive strength type test
The 28-day compressive strength of cement mortar should not be less than 50MPa, except for the following cases, the type test of compressive strength should be in accordance with GB/T 17671
get on.
--- The sand, cement and water used for prism samples are the same as those used for the coating of the lining, and the water should meet the requirements of 3.3;
--- The sand/cement ratio used for the prism specimen is the same as the sand/cement ratio in the mortar before the lining coating;
--- The water/cement ratio used for the prism sample is the same as the water/cement ratio in the newly coated lining;
--- When the water/cement ratio is less than 0.35, use impact plate (GB/T 17671) or vibration plate (63Hz/120s ± 5s) to process the test block.
Note. Considering the effect of centrifugal rotation, allow excess water to be discharged.
7.3 Chemical resistance
When transporting sewage, it should meet the requirements of 7.6 in GB/T 26081-2010 and follow the requirements of 9.8 in GB/T 26081-2010.
Experiment.
7.4 Abrasion resistance
When transporting sewage, it should meet the requirements of 7.7 in GB/T 26081-2010 and follow the requirements of 9.9 in GB/T 26081-2010.
Experiment.
8 Test conditions
8.1 General
Each inspection specified in this standard shall be carried out in accordance with the following conditions and in accordance with the provisions of the manufacturer.
8.2 Sand
8.2.1 For each supply source, a representative sample should first be taken to test the organic content and mud content of the sand and determine the sand
Particle size curve. In the future supply, regular inspections should be carried out in accordance with the provisions of the manufacturer.
8.2.2 The frequency of the above two tests may vary with the regularity of the incoming materials; especially the supply source changes, or if the same source is found
When the sand supply is irregular, the inspection frequency should be increased, at least temporarily.
8.3 Lining thickness
8.3.1 At least one of nodular cast iron pipes of each diameter produced by each shift and each coating unit shall be used for lining thickness
Detection.
8.3.2 At least one of the same-sized pipe fittings produced by each shift shall be taken for the lining thickness test.
8.4 Lining appearance
8.4.1 The appearance of spheroidal graphite cast iron pipes and pipe fittings shall be inspected one by one (parts). Special attention shall be paid to the surface condition of the inner lining and the end lining.
8.4.2 Any repairs deemed necessary after inspection shall be carried out in accordance with the methods in 4.5.
Appendix A
(Informative appendix)
Structural changes of this standard compared with ISO 4179..2005
Compared with ISO 4179..2005, this standard has a lot of adjustments in structure. See Table A.1 for comparison of specific chapter number adjustments.
Table A.1 Comparison of the adjustment of chapter numbers in this standard and ISO 4179..2005
This standard chapter number corresponds to ISO 4179..2005 chapter number
5.3-
7-
Appendix A-
Appendix B-
Appendix B
(Informative appendix)
Technical differences between this standard and ISO 4179..2005 and their causes
Table B.1 gives the technical differences between this standard and ISO 4179..2005 and their causes.
Table B.1 Technical differences between this standard and ISO 4179..2005 and their causes
Articles of this standard
Numbering
Reasons for technical differences
Regarding the normative references, this standard has made adjustments with technical differences.
The situation is reflected in Chapter 2 “Regulatory Reference Documents”. The specific adjustments are as follows.
--- Replaced ISO 2531 with GB/T 13295-2019 that adopted the international standard
(See Chapter 1, 3.1.2);
--- Replaced ISO 7186 with GB/T 26081-2010, which adopted the international standard
(See Chapter 1, 3.1.2);
--- Replaced ISO 16132 with GB/T 32488 which adopted the international standard (see
4.4.2);
--- Added references to GB/T 175 (see 3.1.1), GB/T 201 (see 3.1.1), GB/T 748
(See 3.1.1), GB/T 14684 (see 3.2.2), GB/T 17219 (see 3.4.2), and
GB/T 17671 (see 7.2)
Comply with GB/T 20000.2-2009, convenient
Standard user use; increased lining water
The specific requirements of mud are provided for standard users.
For evidence
3.1.1 stipulates that cement meets the requirements of GB 175, GB/T 201, GB/T 748 to provide a basis for selection for standard users
3.4.2 Added GB/T 17219
Provide standard users with delivery of life drinks
Selection of water pipe lining
Table 1
Modified the maximum crack width and radial displacement of the mortar lining to meet customer requirements, which is conducive to the development of the industry
Increased the nominal thickness of DN40 ~ DN300 mortar lining in line with the status quo of the industry, which is conducive to the development of the industry
Increased the maximum crack width and nominal thickness of DN2800 ~ DN3000 mortar lining
Simultaneous repair with GB/T 13295-2019
Change and maintain the relevant standard technical content
Consistency
Edited the nominal diameter to meet China's national conditions and standards
5.3 Increased crack width measurement facilitates enterprises and customers to detect crack width
7 Added other (type test and test requirements for chemical resistance, abrasion resistance, etc.) to facilitate enterprises to perform type tests
8.3.1 Refined pipe mortar lining thickness detection method to enhance the operability of the detection method
8.3.2 Refined the detection method of mortar lining thickness of pipe fittings to enhance the operability of the detection method
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