CECS : 17-2000 Technical Specification for Buried Rigid Polyvinyl Chloride Water Supply Pipeline Engineering
Some standard content:
CECS 17:2000
China Engineering Construction Standardization Association Standard
Buried unplasticized polyvinyl chloride water supply pipeline engineering
Technical specification
Technical specification for buried unplasticized polyvinyl chloride(PVC-U)
pipeline of water supply engineering2000
China Engineering Construction Standardization Association Standard
Buried unplasticized polyvinyichloride(PVC-U)pipeline of water supply engineering
Technical specification
Technical specification for buried unplasticized polyvinyichloride(PVC-U)pipeline of water supply engineeringCECS17:2000
Editor: Beijing Municipal Engineering Design and Research Institute Harbin University of Architecture
Approval: China Association for Engineering Construction Standardization Effective date: December 1, 2000
2000 Beijing
According to the requirements of the Letter of China Association for Engineering Construction Standardization (96) No. 31 on Issuing the Plan for the Preparation of Recommended Standards in 1996, this regulation is formulated. Rigid polyvinyl chloride (PVC-U) water supply pipe is the chemical pipe material currently used in urban water supply pipeline projects. China Association for Engineering Construction Standardization promulgated the "Design Code for Outdoor Rigid Polyvinyl Chloride Water Supply Pipeline Project" CECS1790 and "Construction and Acceptance Code for Outdoor Rigid Polyvinyl Chloride Water Supply Pipeline Project" CECS18:90 in 1990. Since PVC-U pipes have been widely used in water supply pipeline projects, the specifications of pipe products have increased and the quality has improved. The above regulations can no longer meet the requirements of development and must be revised.
This regulation is revised on the basis of summarizing the experience of laying PVC-U water supply pipeline projects in China for more than ten years, combining the pilot work of PVC-U water supply pipeline projects in various cities since 1997, and referring to recent foreign data and relevant standards. For the convenience of application, the two regulations CECS17 and CECS18 are combined into one "Technical Regulations for Buried Rigid Polyvinyl Chloride Water Supply Pipeline Projects". The association standard "Technical Regulations for Buried Rigid Polyvinyl Chloride Water Supply Pipeline Projects" is now approved. The number is CECS 17: 2000 and is recommended for use by engineering construction design, construction and user units. This regulation is managed by the Pipeline Structure Committee of the China Engineering Construction Standardization Association and interpreted by Beijing Municipal Engineering Design and Research Institute (No. 2, Yuetan South Street, Beijing, Postal Code: 100045). If you find any need for modification or supplementation during use, please send your opinions and information directly to the interpretation unit.
From the date of approval of this regulation, CECS 17:90 and CECS 18:90 will be abolished at the same time. Editor-in-chief: Beijing Municipal Engineering Design and Research Institute Harbin University of Architecture
Participating units: Shanghai Municipal Engineering Design Institute Changsha Design Institute of Chemical Industry
Technology Development Promotion Center of the Ministry of Construction
Water Supply Companies in Shanghai, Jinan, Qingdao, Chengdu, Guangzhou, Zhengzhou, Tianjin and other cities
Jiangyin Dawei Plastic Company Jiangyin Chemical Plastic Factory Main drafters: Pan Jiaduo, Liu Cansheng, Zhang Linwei, Li Guifen, Zhai Rongshen Zhang Yongquan, Chen Mingyao, Chen Qingrong, Liu Yuxin, Xin Zhaobin He Weihua, Cheng Xiling, Zhang Zhanjun, Fang Jialin, Gao Jianhua China Engineering Construction Standardization Association
August 15, 2000
Terms and main symbols
Terms·
Main symbols
Elastic sealing rubber ring
Adhesive solvent·
Item list
Transportation and storage of pipes··…
Pipeline hydraulic calculation
Pipeline structure calculation
Basic provisions
Strength calculation
Deformation calculation
Stability verification
Pipeline longitudinal temperature deformation calculation
Pipeline laying·．
General provisions
........
Trench excavation, pipe laying, backfilling
Pipeline connection
General provisions
Rubber ring sealed flexible joints
Solvent bonding connection
(11)
(23)
Siduan
Pipeline accessories and ancillary structures·
Expansion joints
Thrust, fixing, anti-slip
Accessories and ancillary structures
Connection between branch pipes, service pipes and existing pipelinesPipeline maintenance.
General provisions
Water outage maintenance
Water outage maintenance
On-site hydraulic test and flushing and disinfection of pipeline system 10.1
General provisions
Preparation before test
Hydraulic test of pipe section
Flushing and disinfection of pipe section
Completion acceptance of vertical project
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Hydraulic gradient table of rigid polyvinyl chloride water supply pipelineNomogram of local positive head loss of pipeline
Table of loads acting on unit length of pipelineComprehensive deformation of soil on the side of pipe Modulus
Acceptance record sheet and appraisal certificate
Explanation of terms used in this regulation
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1 General
1.0.1 This regulation is formulated to reasonably use rigid polyvinyl chloride (PVC-U) pipes and fittings in outdoor buried water supply pipeline projects, achieve advanced technology, economic rationality, stable water quality, convenient construction, safe and applicable, and ensure project quality. 1.0.2 This regulation is applicable to the design, construction and acceptance of newly built, rebuilt and expanded outdoor buried water supply pipeline projects under general geological conditions, and can also be used for the maintenance of existing pipeline projects.
This code is applicable to water transmission and distribution pipelines with water temperature not lower than 0℃ and not higher than 45℃.
1.0.3This code can be applied to water supply pipeline projects buried in acidic, alkaline and other corrosive soils. For outdoor buried water supply pipeline projects built in special soil layers such as collapsible soil and expansive permafrost, the provisions of corresponding special standards shall also be observed. 1.0.4 The pipes, pipe fittings and accessories, sealing rubber rings, bonding solvents, etc. used in pipeline projects must meet the requirements of current national product standards and have valid certification documents such as factory certificates and product licenses.
1.0.5 In addition to implementing the provisions of this code, outdoor buried water supply pipeline projects shall also comply with the relevant provisions of current national standards.
2 Terms and main symbols
2.1 Terms
2.1.1 Nominal outside diameter (d,) nominal outside diameter The nominal outside diameter of pipes and fittings used in rigid polyvinyl chloride (PVC-U) piping systems. Excluding pipe fittings calibrated by flanges and thread sizes. Note: The nominal outside diameter &. listed in this specification is the minimum average outside diameter of the pipe and can be used as the design outside diameter of the pipe.
2.1.2 Nominal wall thickness (e,) nominal wall thickness The specified wall thickness of the pipe. Equivalent to the minimum wall thickness specified at any point on the pipe wall. Note: The nominal wall thickness en listed in this specification can be used as the design wall thickness of the pipe. 2.1.3 Nominal (rated) pressure (PN) nominal pressure The internal water pressure index related to the mechanical properties of the piping system components. Note: The nominal pressure index specified in this specification is the permissible application index of the long-term internal water pressure of the piping system components.
2.1.4 Working pressure (F) working pressure The maximum continuous operating pressure acting on the inner wall of the water supply pipeline system under normal working conditions. It does not include the water hammer pressure of water. 2.1.5 Water hammer pressure (△F) surge pressure In the water supply pipeline system, the instantaneous pressure greater than the working pressure is generated due to the sudden change in the water flow rate, also known as surge pressure. 2.1.6 Design pressure (Fua) design pressure The maximum instantaneous pressure acting on the inner wall of the water supply pipeline system during operation. It is the sum of the working pressure and the residual water hammer pressure in the long-term operation of the pipeline. Note: The design pressure in this code adopts the maximum on-site water pressure test pressure of the pipeline system. 2.1.7 Hydrostatic stress Circumferential tensile stress generated by the pipe wall under the action of internal water pressure. 2
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The minimum guaranteed value of the circumferential tensile strength of PVC-U pipes under the long-term action of internal pressure of 50 years at a water temperature of 20℃. This value is the long-term hydrostatic design basis (HDB) of the circumferential tensile strength of PVC-U pipes. 2.1.9 Overall service (design) coefficient (K) Overall service (design) coefficient The design safety factor greater than 1 determined based on the characteristics of PVC-U pipes and the working conditions of the pipeline system.
Note: MRS divided by K is the allowable circumferential tensile strength of the pipes specified in this code at 20℃.
2.1.10 Secondary processing fittings made from pipe A general term for elbows, tees and other pipe fittings assembled after PVC-U pipes are cut into special-shaped short pipes.
2.1.1l Transition fitting is a general term for a special pipe fitting with conversion performance used to connect PVC-U pipes with different materials such as cast iron pipes, steel pipes, other plastic pipes, or valves and other accessories. According to the needs of the pipeline system connection, there are short pipes, tees, crosses and other forms, and their specifications and dimensions must meet the form and technical requirements of each end joint. 2.1.12 Water stopper, tapping saddle tee, tapping sleeve is a special fitting used to open holes on the existing PVC-U pipeline to install branch pipes and household pipes. Its basic structure is two semi-circular pipe clamps that can be fastened to the pipeline. Various openings and joint facilities are set on the upper semi-circular pipe clamp, which can be used to open holes to connect branch pipes and household pipes under water-free or water-containing conditions. It is generally a series of special products made by the factory, such as vertical water stopper with water holes, rotating water saddle, etc.
2.1.13 Maximum temperature difference between construction and operation
The maximum temperature difference between the ambient temperature when the pipes are connected into an integral pipeline during laying and the temperature of the medium inside and outside the pipeline after operation. For rigid joints such as bonding and welding, it is the ambient temperature difference when the pipe sections connected are finally assembled; for flexible joints such as rubber ring sealing, it is the ambient temperature difference when each pipe is inserted. 3
Loads on pipelines
2.2 Main symbols
F-working pressure of pipeline;
Fu-designed internal water pressure of pipeline;
PN-nominal pressure of pipe material;
△F-water hammer pressure of pipeline;
FA-vacuum pressure in pipeline
Fc-soil pressure at the top of pipeline transmitted by ground vehicle wheel pressure per unit length of pipeline,
Fcs-critical pressure of pipeline wall instability;
F-soil pressure at the top of pipeline transmitted by ground accumulation per unit length of pipeline,
W.-vertical soil pressure at the top of pipeline per unit length of pipeline. 2.2.2 Geometric parametersbzxZ.net
dn-outer diameter of pipe material;
d;-inner diameter of pipe material;
en-calculated thickness of pipe wall;
d. =Calculated diameter of pipe section (equal to dn-en) f-maximum vertical displacement of pipe;
ro-calculated radius of pipe section;
B-groove width at the horizontal center of pipe or total width of backfill soil on both sides; H-covering height from pipe top to designed ground. 2.2.3 Calculation parameters and coefficients
g-gravitational acceleration;
h-head loss along pipe flow;
r-gravitational density of soil:
r-gravitational density of water;
-average flow velocity of pipe water
double response number of channel,
E-comprehensive deformation modulus of soil on pipe side;
E. 1. Deformation modulus of backfill soil on the pipe side;
E-deformation modulus of original soil on both sides of the trench; E-elastic modulus of pipe material;
fu-circumferential tensile strength of pipe material (minimum required strength MRS); K-circumferential tensile design safety factor of pipe wall; K-design anti-floating stability safety factor of pipeline; K. 1. Design stability safety factor of pipe wall section: 1. Pipeline hydraulic friction coefficient,
-circumferential tensile stress generated by pipe wall under internal pressure: 1. Poisson's ratio of pipe material;3 Calculation parameters and coefficients
g-gravitational acceleration;
h-head loss along the pipeline flow;
r-gravity density of soil:
r-gravity density of water;
-average velocity of pipeline water
double response number of channel belt,
E-comprehensive deformation modulus of soil on the pipe side;
E.-deformation modulus of backfill soil on the pipe side;
E-deformation modulus of original soil on both sides of the trench; E-elastic modulus of pipe material;
fu-circumferential tensile strength of pipe material (minimum required strength MRS); K-circumferential tensile design safety factor of pipe wall; K-design anti-floating stability safety factor of pipeline; K. 1. Design stability safety factor of pipe wall section: 2. Pipe hydraulic friction coefficient,
3. Hoop tensile stress generated by pipe wall under internal pressure: 4. Poisson's ratio of pipe material;3 Calculation parameters and coefficients
g-gravitational acceleration;
h-head loss along the pipeline flow;
r-gravity density of soil:
r-gravity density of water;
-average velocity of pipeline water
double response number of channel belt,
E-comprehensive deformation modulus of soil on the pipe side;
E.-deformation modulus of backfill soil on the pipe side;
E-deformation modulus of original soil on both sides of the trench; E-elastic modulus of pipe material;
fu-circumferential tensile strength of pipe material (minimum required strength MRS); K-circumferential tensile design safety factor of pipe wall; K-design anti-floating stability safety factor of pipeline; K. 1. Design stability safety factor of pipe wall section: 2. Pipe hydraulic friction coefficient,
3. Hoop tensile stress generated by pipe wall under internal pressure: 4. Poisson's ratio of pipe material;
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