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Seamless steel tube installation

General rules for installation of penstocks

1. In order to standardize the qualification accreditation work of pressure piping installation units (hereinafter referred to as the installation units) and guarantee the quality of installation of pressure pipelines, the detailed rules for implementation are formulated in accordance with the responsibilities assigned by the State Council to the departments of quality and technical supervision and the provisions of the "Regulations on safety management and supervision of pressure pipes" (hereinafter referred to as the "Twelfth provisions").  

Two. Units engaged in pressure piping installation within the scope of application of the regulations must have the qualification to install corresponding class pressure piping (hereinafter referred to as the installation qualification), and obtain the "pressure pipe installation permit" according to the detailed rules for implementation.

Three. Installation qualification category and classification:

A and long distance pipelines are installed as GA.

1. The long distance pipeline that meets one of the following requirements is GAl grade:

(1) transport toxic, flammable, explosive gas medium, design pressure P > 1.6 MPa pipeline;

(2) transport toxic, flammable, explosive liquid fluid medium, transportation distance (transportation distance refers to the place of production, storehouse, the direct distance between the users for conveying the commercial media pipeline) and the pipe diameter of 200km or DN or more than 300mm.

(3) conveying slurry medium, conveying pipeline with a distance of more than 50km and nominal diameter of pipe DN equal to or equal to 150mm.  

2, meet the following requirements of the long transmission pipeline foot GA2 level.  

(1) transport toxic, flammable, explosive gas medium, design pressure P less than 1.6PMa pipeline;

(2) pipes outside the scope of GAl (2);

(3) pipes outside the scope of GAl (3).  

B and public pipelines are installed as GB classes.

(1) GBl: gas pipeline;

(2) GB2: heat pipe.  

C and industrial pipelines are installed as GC.

1. The industrial pipeline that meets one of the following requirements is GC1 grade:

(1) delivering GB5044 "classification of hazard levels of occupational exposure to toxic substances" stipulates that the toxic degree is extremely harmful to the medium.

(2) transport GB50160, "code for design of fire protection in petrochemical enterprises" and "fire prevention code for building design", which are fire hazard of class A, class B, flammable gas or class a flammable liquid medium, and design pressure of P > 4.0MPa; and GBJl6.

(3) to transport flammable fluid medium and toxic fluid medium, design a pipeline with a pressure of P or more than 4 MPa and design temperature greater than 400 degrees.

(4) conveying fluid medium and designing pipes with pressure of P or less than 10.0MPa.  

2. The industrial pipeline that meets one of the following requirements is GC2 grade:

(1) transport GB50160 "code for design of fire protection in petrochemical enterprises" and "fire prevention code for building design" stipulate that the fire risk is class A, class B flammable gas or class a flammable liquid medium, and the design pressure is P < GBJl6. 4.0MPa Pipes;

(2) to transport flammable fluid medium and toxic fluid medium, design pressure P < 4.0MPa and design temperature greater than 400 degrees;

(3) conveying non combustible fluid medium and non-toxic fluid medium, and designing a pipeline with a pressure of P < 10MPa and designing a temperature greater than 400 degrees C.

(4) transport fluid medium, design pressure P < 10MPa and design temperature of less than 400 degrees.  

3. GC2 grade pipes that meet one of the following requirements are divided into GC3 grade:

(1) conveying the combustible fluid medium and toxic fluid medium, the design pressure is P < 1.0MPa And design a pipeline with a temperature of less than 400 degrees.

(2) conveying non combustible fluid medium and non-toxic fluid medium, and designing a pipeline with a pressure of P < 4.0MPa and design temperature below 400 C.

Qualification requirements for pressure piping installation:

1. Installation units with GA1 class installation qualification, that is, installation qualification of pressure pipes with corresponding grades in GA2 grade;

2. Installation units with GC1 class installation qualification, that is, installation qualification of pressure pipes corresponding to GC2 and GC3 grades.

3. Installation units with GC2 class installation qualification, that is, installation qualification of pressure pipes with corresponding grades in GC3 grade.

Compressed air pipe installation flow:

Pressure piping design Construction preparation: preparation for technology, preparation for technology, preparation of materials, preparation of materials, preparation of materials, preparation of materials, programming, technical transfer, pipe section cutting, groove processing, pipe assembly, material identification, pipeline pressure test, corrosion prevention, tube purge, quality inspection, pressure piping tightness test, hand over acceptance.


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