Examining the types of pipes that can be used in the water and sewage transfer project
Table of Contents :
1. Introduction
2- Pipe selection criteria
3- Types of common pipes in the industry
4- The lifespan of common pipes in the water industry
5- Comparison of common types of pipes in the water industry
5-1- Comparison of polyethylene, cast iron, steel and fiberglass pipes under normal operating conditions
5-2- Comparison of polyethylene, cast iron, steel and fiberglass pipes for installation in earthquake-prone areas and lands with special conditions
5-2-1- The behavior of different pipes against earthquakes
5-2-1-1- Definition of damaging factors to pipes
5-2-1-1-1- Ground shaking
5-2-1-1-2- permanent displacement of the earth
5-2-1-2- failure modes in buried pipes
5-2-1-3- Earthquake effect on all types of pipes
5-2-1-3-1- Seismic behavior of pipes
5-2-1-3-1-2-important vulnerable components of buried pipes during an earthquake
5-2-1-4- Conclusion
5-2-2- The behavior of different pipes in corrosive soils
6- Combined and new pipes
6-1-composite pipes - steel
2-6-Cargoite polyethylene pipe reinforced with steel
6-3- Spiral polyethylene pipe reinforced with steel
6-4- Polymer concrete pipes
6-5- Polyethylene-composite pipes (PE-GF)
6-5-1- Regression analysis
6-5-2- Connections and accessories
6-6- Conclusion
7- Investigating the effect of soil corrosion on determining the type of pipe
7-1- Basics of corrosion in the soil environment
7-1-1- Alkaline and neutral soils
7-1-2- Acid soils
2-7- Soil
7-2-1- Soil permeability
3-7- Factors that affect impact on the soil
7-3-1- Type of soil
7-3-2- Humidity level and location of underground water
7-3-3- Electrical resistance of the soil and amount of dissolved ions
7-3-4- Soil pH
7-3-5- Oxidation-reduction potential (ORP)
7-3-6- Different levels of oxygen
4-7- Effects of soil on cathodic protection and protective coatings
5-7- Corrosion of coated pipes
7-5-1- Pipe cover damage
7-5-2- Cover loss mechanism
6-7- Solutions for estimating soil corrosion potential for metal pipes
8- Choosing the type of pipe
8-1- Technical criteria and limitations
2-8- Economic criteria
8-2-1- Comparison of capital cost of different types of pipes
3-8- Choosing the type of pipe used in water supply projects
8-3-1- Hierarchical analysis method
8-3-2- Criteria affecting the selection of the best type of pipe
8-3-3- Conclusion
Abstract :
This report aims to review and compare the technical and economic types of common pipes that can be used in the water and sewage transfer project, according to what is presented in this report, and according to the examination of different technical and economic criteria in similar water supply projects, the use of Fiberglass pipes have the first priority according to the comparison made by the AHP method and considering the investment and current costs.
1- The cost of supplying and implementing fiberglass pipes in all diameters, especially the pipe with a diameter of 2000 mm, is the cheapest option, and this cost for the diameter of 2000 is 22% less than steel pipe and 28% less than cast iron pipe.
1. Introduction
The major part of the costs of water supply projects and water and sewage transmission lines are the costs of buying and installing pipes, so that around 50 to 60 percent of the cost of constructing water and sewage transmission systems is the cost of supplying pipes and fittings.
Considering the variety of pipe material and the development of domestic industries in this sector, the issue of deciding on the appropriate pipe material and diameter is of particular importance. In order to choose the type of pipe while complying with the standards, the hydraulic characteristics of the design such as the diameter and working pressure of the pipes, delivery time and production facilities by different factories should be examined.
This report is prepared as a general report, taking into account the current conditions of the country and the capabilities of manufacturing different types of pipes inside the country, and in order to help and guide the relevant experts in order to facilitate the process of choosing the right type of pipe for each project. has been
2- Pipe selection criteria
The following factors should be considered in choosing the pipe:
• Pipe resistance against internal and external loads
• Pipe resistance against water and soil corrosion
• Ease of preparation, purchase, transportation and installation costs
• The roughness of the inner wall and how it increases during the project period
• How to connect the pipe and its accessories
• Durability and flexibility of the pipe
• Working pressure, operating conditions and ambient temperature
In order to investigate the resistance of the pipe against internal and external corrosion, it is necessary to have sufficient information about the soil type of the route and also the water-soluble substances. In general, corrosion causes the destruction and destruction of a part of the pipe in contact with water, air, soil or any other corrosive substance. This action takes place due to the mutual effect of the material of the pipe body and its surrounding environment due to chemical interactions. Of course, the problems caused by sedimentation are no less than corrosion, because in water supply facilities and especially water and sewage transportation, the formation of sediment reduces the useful capacity of the facilities.
Other effective factors in choosing the type of pipe include the location, expected life, and skill of the labor force for installing the pipes. It is mostly observed that the best material accepted from the technical and engineering point of view is not provided with the simplicity and speed expected by the design, or the costs of its preparation and implementation are very heavy, in which case it is preferred in order to reduce the initial costs or fast implementation. And at the time of the project, he neglected to choose the best one and chose the most appropriate one in the existing conditions.
3- Types of common pipes in the water industry
Common pipes in water and sewage transmission lines are: pipes