Seek help from technical regulations for the design of pressure piping

Legal Analysis: Specification for Pressure Test of Water Supply and Drainage Pipes: Code for Acceptance of Construction Quality of Building Water Supply and Drainage and Heating Engineering GB 50242-2002 The hydraulic test of indoor water supply pipes must meet the design requirements.

When the design is not specified, the test pressure of various materials for the piping system is times the working pressure.

Legal basis: "Work Safety Law of the People's Republic of China" Article 4 Production and business operation entities must comply with this Law and other laws and regulations related to production safety, strengthen production safety management, establish and improve the safety production responsibility system and safety production rules and regulations for all employees, increase the investment in safety production funds, materials, technology and personnel, improve safety production conditions, strengthen the standardization and informatization of safety production, and build a dual prevention mechanism of safety risk grading control and hidden danger investigation and management. Improve the risk prevention and resolution mechanism, improve the level of safe production, and ensure safe production.

Production and business operation units in emerging industries and fields such as the platform economy shall, on the basis of the characteristics of their respective industries and fields, establish, improve and implement a responsibility system for production safety for all employees, strengthen education and training on production safety for employees, and perform the relevant production safety obligations provided for in this Law and other laws and regulations.

1. Vacuum pipeline：p<0mpa

2. Low-pressure pipelines：0≤p≤

3. Medium pressure pipeline4. High-pressure pipelines5. Ultra-high pressure pipeline：p>100mpa

Considerations: Access issues.

Pipelines on the ground should avoid intersecting roads, railways and waterways as much as possible. When crossing cannot be avoided, the height of the crossing should also enable pedestrians and vehicles to pass safely. Underground pipes are generally laid along roads, and appropriate distances are maintained between various pipes for installation and maintenance; The surface of the heating pipe has an insulation layer, which is laid in the trench or protective pipe, and should avoid bending and being crushed by the soil and making the pipe expand and move.

Supporting issues. The pipeline may bear many kinds of external forces, including its own weight (the weight of the pipe, valve, pipe connection, insulation layer and the fluid in the pipe), the thrust of the fluid pressure acting on the pipe end, the wind and snow load, the soil pressure, the thermal stress caused by thermal expansion and contraction, the vibration load and the first disaster.

In order to ensure the strength and rigidity of the pipeline, various supports (hanging) frames must be arranged, such as movable supports, fixed supports, guide supports and spring supports. The setting of the bracket is determined according to the diameter, material, wall thickness and load of the pipe. The fixed bracket is used to control the thermal elongation of the pipe in sections, so that the expansion joint works evenly.

The guide bracket allows the tube to move only axially.

Slope and drain venting.

In order to close the fiber to remove condensate, steam and other water-containing gas pipelines should have a certain slope, generally not less than two thousandths. For underground drainage pipes that use gravity to flow, the slope is not less than five thousandths.

Steam or other water-containing gas pipelines are provided with drains or traps at the lowest point, and some gas pipelines are also equipped with gas-water separators to drain the water in time to prevent water hammer and obstruction of gas flow in the pipes. The water supply or other liquid pipes are equipped with an exhaust device at the highest point to remove the air or other gases accumulated in the pipes to prevent abnormal operation caused by gas blockage.

Pressure piping installation requirements. 1. Bring information before installation. 1.

Pipeline construction drawings, scattered burial design instructions, etc. Project feasibility study report and approval. 2 .

Report on the commencement of the pressure pipeline project reviewed by the supervision department. The pressure pipeline commencement report must be filled in carefully, completely and accurately. To fill in the Pipeline Diameter and Length and the Main State, you want to interface with the device name.

3.Construction organization design, construction technology, plan. Welding process qualification, welding instruction.

Rush to close the ant 4The construction contract signed between the construction unit and the construction unit; Purchase and sale contracts. The contract signed between the construction unit and the supervision, testing, anti-corrosion and thermal insulation unit.

Legal Analysis: Broadly understood, pressure pipes refer to all pipes that are subjected to internal or external pressure, regardless of the medium of the fibrillation hood in the pipe. The pressure pipeline is a part of the pipeline, which is used to transport, distribute, mix, separate, discharge, measure, control and stop the flow of fluids, and is composed of pipes, pipe fittings, flanges, bolt connections, tankan gaskets, valves, other components or pressure parts and supporting parts.

Industry regulations. Since the promulgation of the Regulations on the Safety Management and Supervision of Pressure Pipelines in China, "pressure pipelines" has become a special term for supervised pipelines. In Article 2 of the Regulations on the Safety Management and Supervision of Pressure Pipelines, pressure pipelines are defined as:

Special equipment used in production and life that may cause explosion or poisoning."

In the "Regulations on the Safety Supervision of Special Equipment" (Order No. 373) issued and implemented on June 1, 2003, the pressure pipeline is further clarified as "the tubular equipment used to transport gas or liquid at a certain pressure, the scope of which is specified as the maximum working pressure is greater than or equal to the gauge pressure) of gas, liquefied gas, vapor medium or liquid medium that is flammable, explosive, toxic, corrosive, and the maximum working temperature is higher than or equal to the standard boiling point. and pipes with a nominal diameter greater than 25mm". This means that the "pressure pipe" refers not only to the pressure inside or outside the pipe, but also to the medium conveyed inside the pipe is "gas, liquefied gas and vapor" or "liquid that may cause ignition, poisoning or corrosion".

Legal basis: Constitution of the People's Republic of China Article 53 Citizens of the People's Republic of China must abide by the Constitution and laws, keep state secrets, protect public property, abide by labor discipline, abide by public order, and respect social morality.

Legal basis: Pressure vessel pressure pipeline design licensing rules Article 6 The personnel engaged in the review and approval of the design of pressure vessels (hereinafter referred to as the examination and approval personnel) and the designers engaged in the analysis and design of pressure vessels shall have the corresponding professional design ability, and after the professional assessment, obtain the corresponding examination and approval personnel and designer qualifications of the pressure vessel.

Personnel engaged in the review and approval of pressure pipeline design and judgment (hereinafter referred to as examination and approval personnel) shall pass the examination and approval of the pressure pipeline design appraisal and evaluation agency, and shall be announced by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, and obtain the qualification certificate of the pressure pipeline design examination and approval personnel within the corresponding approval scope, and the assessment plan of the examination and approval personnel shall be uniformly announced by the General Administration of Quality Supervision, Inspection and Quarantine at the beginning of each year.

The qualifications of the designers and approvers of pressure vessels and pressure pipelines are valid for 4 years.

Summary. The thickness of the pressure drainage pipe is used according to the requirements of the specification: 1. The national thickness standards for PVC pressure drainage pipes with different nominal inner diameters are different.

Generally, the minimum wall thickness of the drainage pipe with an inner diameter of 50 is, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 75 is, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 90 is, and the maximum wall thickness is the minimum wall thickness of the drainage pipe with a nominal inner diameter of 110, and the maximum wall thickness is.

The minimum wall thickness of the drainage pipe with a nominal inner diameter of 125 is, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 160 is, and the maximum wall thickness is the minimum wall thickness of the drainage pipe with a nominal inner diameter of 200, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 250 is, and the maximum wall thickness is.

The minimum wall thickness of the drainage pipe with a nominal inner diameter of 315 is, and the maximum wall thickness is.

The thickness of the pressure drainage pipe is used according to the requirements of the specification: 1. The national thickness standards of PVC pressure discharge orange spine water pipes with different nominal inner diameters are different. Generally, the minimum wall thickness of the drainage pipe with an inner diameter of 50 is, and the maximum wall thickness is.

The minimum wall thickness of the drainage pipe with a nominal inner diameter of 75 is, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 90 is, and the maximum wall thickness is the minimum wall thickness of the drainage pipe with a nominal inner diameter of 110, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 125 is, and the maximum wall thickness is.

The minimum wall thickness of the drainage pipe with a nominal inner diameter of 160 is, and the maximum wall thickness is the maximum wall thickness of the drainage pipe with a nominal inner diameter of 200. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 250 is, and the maximum wall thickness is. The minimum wall thickness of the drainage pipe with a nominal inner diameter of 315 is, and the maximum wall thickness is.

DN50 GB wall thickness? DN80 GB wall thickness? DN100 national standard wall thickness? DN150 GB wall thickness?

We use hot-dip galvanized pipes.

The nominal outer diameter of DN50 is the wall thickness of the standard type of steel pipe and the wall thickness of the thickened steel pipe.

Wall thickness of the steel pipe, outer diameter.

The outer diameter and wall thickness of 4mmDN100 seamless steel pipe are 108mm and the wall thickness is 4mm according to the national standard.

Galvanized steel pipe, the national standard wall thickness is, the outer diameter is 165, and the weight is.