How industrial pipes are graded by pressure What standards are cited

According to the pressure mode, it is divided into external pressure vessel and internal pressure vessel.

1.External pressure vessels.

When the internal pressure of the container is less than an absolute atmosphere (about 2Internal pressure vessel (according to the design pressure p).

Low pressure (L) container MPA p MPA

Medium pressure (m) vessel mpa p mpa

High pressure (h) container 10 MPa p 100 MPa, ultra high pressure (U) container p 100MPa

Specification standards for pressure vessels——

Such as China's GB150 "Steel Pressure Vessel".

JB4732 "Steel Pressure Vessel - Analysis and Design Standard".

JB T4735 "Steel Welded Atmospheric Pressure Container".

Technical regulations, "Regulations for the Safety and Technical Supervision of Pressure Vessels", etc.

"Levels:

Vacuum tubing P<0MPa

0 p for low-pressure pipes

Medium-pressure pipelines High-pressure pipelines 10

Ultra-high pressure pipeline P>100MPa

Pipeline-level classification.

1. GA1 level.

1. Long-distance pipelines that convey toxic, flammable and explosive gas media with a maximum working pressure greater than that;

2. Convey toxic, flammable and explosive liquid media, the maximum working pressure is greater than or equal to, and the conveying distance (refers to the length of the pipeline used to transport commodity medium between the origin, storage and user) is 200km.

2. GA2 level.

Long-distance pipelines other than GA1 are GA2.

3. GB.

1. GB1, gas pipeline;

2. GB2, thermal pipeline.

4. GC class.

1. Send pipelines with GB5044 "Classification of Occupational Exposure to Toxic Hazards", which is extremely hazardous to the medium;

2. Pipelines that transport GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings" with fire hazard of Class A and B combustible gas or Class A flammable liquid medium and design pressure P;

3. Pipelines that convey flammable fluid medium and toxic fluid medium with design pressure p and design temperature greater than or equal to 400;

4. Pipelines that transport fluid medium and design pressure p;

5. Conveying the fire hazard specified in GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings" is Class A and B combustible gas or Class A flammable liquid medium and design pressure; p< pipes;

6. Pipes for transporting flammable fluid medium and toxic fluid medium, with a design pressure of < and a design temperature of 400;

7. Pipes for transporting non-flammable fluid medium and non-toxic fluid medium, with a design pressure of < and a design temperature of 400;

8. Pipes with a design pressure of p< and a design temperature of <400 for conveying fluid medium.

Legal basis

Regulations on Safety Supervision of Special Equipment

Article 22 The user of special equipment shall strictly implement the provisions of these Regulations and the laws and administrative regulations related to production safety to ensure the safe use of special equipment.

Article 26 The user of special equipment shall establish a safety technical file for special equipment. The safety technical file shall include the following contents: (1) the design documents, manufacturing units, product quality certificates, use and maintenance instructions and other documents of special equipment, as well as installation technical documents and materials;

2) Records of regular inspection and regular self-inspection of special equipment;

3) Records of the daily use of special equipment;

4) Daily maintenance records of special equipment and its safety accessories, safety protection devices, measurement and control devices and related auxiliary instruments;

5) Records of special equipment operation failures and accidents;

6) Energy efficiency test reports, energy consumption records and energy-saving transformation technical data of high-energy-consuming special equipment. ”

Legal analysis: pipeline pressure classification standard: vacuum pipeline p 0mpa low-pressure pipeline medium pressure pipeline high-pressure pipeline 10 p100mpa ultra-high pressure pipeline p 100mpa

Legal basis: Article 2 of the Standardization Law of the People's Republic of China The standards (including standard samples) mentioned in this law refer to the technical requirements that need to be unified in the fields of agriculture, industry, service industry and social undertakings.

Standards include national standards, industry standards, local standards, group standards, and enterprise standards. National standards are divided into mandatory standards and recommended standards, and industry standards and local standards are recommended standards.

Mandatory standards must be enforced. The State encourages the adoption of recommended standards.

Legal Analysis: According to the laws of our country, the grades are as follows:

Vacuum tubing P<0MPa

0 p for low-pressure pipes

Medium-pressure pipes. High-pressure pipeline 10

Ultra-high pressure pipeline P>100MPa

Legal basis: Full text of the Regulations on Safety Supervision of Special Equipment.

1. Vacuum pipeline p<0MPa.

2. 0 p for low-pressure pipelines.

3. Medium-pressure pipelines: high-pressure and Hecou pipelines 105, ultra-high-pressure pipelines P>100MPa.

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 greater danger such as explosion or poisoning".

The pipeline is divided into three grades: GC1, GC2 and GC3 according to the design pressure, design temperature, medium toxicity, corrosiveness and fire hazard.

1. Industrial pipelines that meet one of the following conditions are GC1 grade wax preparation:

a) Pipelines transporting extremely hazardous media in GB5044 "Classification of Occupational Exposure to Toxic Hazards";

b) Pipelines transporting Class A and B combustible gases or Class A flammable liquid media with a design pressure P specified in GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings";

c) Pipelines that transport flammable fluid medium and toxic fluid medium, with design pressure p and design temperature greater than or equal to 400;

d) Pipes that transport fluid media and are designed with pressure p.

2. If the industrial front bureau meets one of the following conditions, the pipeline is GC2 level:

a) Conveying the fire hazard specified in GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings" is Class A and B combustible gas or Class A flammable liquid medium and design pressure.

p< pipes;

b) Pipelines for transporting flammable fluid media and toxic fluid media with a design pressure of P< and a design temperature of 400;

c) Pipelines for transporting non-flammable fluid medium and non-toxic fluid medium with a design pressure of < and a design temperature of 400;

d) Pipes that convey fluid medium, design pressure p< and design temperature < 400;

3. The industrial pipeline that meets the following conditions is GC23 grade:

Pipes that convey non-toxic, non-flammable fluid media with design pressure and design temperature higher than -20 but not higher than 186.

Legal Analysis: Vacuum Piping P<0MPa

Low-pressure pipelines. Medium-pressure pipes.

Legal basis: Article 3 of the Regulations for the Safety and Technical Supervision of Industrial Pressure Pipelines This provision applies to pipelines and their ancillary facilities with one of the following conditions:

1) Pipelines transporting extremely hazardous media as specified in GB5044 "Classification of Occupational Exposure to Toxic Substances";

2) Pipelines transporting Class A and B media with fire hazards specified in GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings";

3) The highest working pressure of the highest chain is greater than or equal to the gauge pressure, the same below), and the pipeline where the medium of transportation is gas (steam) and liquefied gas;

4) Pipelines with a maximum working pressure greater than or equal to a liquid in which the conveying medium is flammable, noisy, toxic, corrosive, or the maximum working temperature is higher than or equal to the boiling point;

5) Ancillary facilities and safety protection devices of pipelines specified in the preceding four paragraphs.

Vacuum pipeline p 0mpa, medium pressure pipeline, high pressure pipeline, high pressure pipeline, 10 p100mpa, ultra-high pressure pipeline, p 100mpa

Article 3 of the Regulations for the Safety and Technical Supervision of Industrial Pressure Pipelines These provisions apply to the pipelines and their ancillary facilities that meet one of the following conditions: (1) pipelines transporting extremely hazardous media with the degree of toxicity specified in GB5044 "Classification of Occupational Exposure to Toxic Substances"; (2) Pipelines transporting Class A and B media specified in the GB50160 "Code for Fire Protection Design of Petrochemical Enterprises" and GBJ16 "Code for Fire Protection Design of Buildings"; (3) The maximum working pressure is greater than or equal to the gauge pressure, the same below), and the conveying medium is gas (steam) and liquefied gas; (4) Pipelines with a maximum working pressure greater than or equal to a liquid in which the conveying medium is flammable, explosive, toxic, corrosive, or the maximum working temperature is higher than or equal to the boiling point; 5) Ancillary facilities and safety protection devices of pipelines specified in the preceding four paragraphs.