HG/T 21629-2021Standard drawings of pipe racks (English PDF)

1.0.1

This standard is developed in order to improve the level of piping design and facilitate the selection of piping supports.

1.0.2

This standard is applicable to process pipings, utility pipings and flue gas pipings of industrial devices used in chemical industry and petrochemical industry.

1.0.3

This standard is prepared according to the current national standard GB/T 28708 Specification for size selection of seamless and welded steel pipe used in piping engineering, which specifies the outer diameter series I of pipes. The piping supports used for pipe series II shall be adjusted accordingly according to the requirements of Annex A.

1.0.4

In addition to this standard, the selection of piping supports shall also comply with the requirements of the current relevant standards of the nation.

2.0.1

The allowable stress of steel used for piping supports shall comply with the requirements of Annex A of the current national standard GB/T 17116.1-2018 Pipe supports and hangers - Part 1: Technical specification.

2.0.2

The material of the piping support shall comply with the corresponding standard drawing of the piping support, and the material of the components in direct contact with the pipeline shall be selected according to the design temperature of the pipings.

2.0.3

In case there is no material specification in the standard drawing of piping support, the material of piping support shall meet those specified in Tables 2.0.3-1 to 2.0.3-3.

Table 2.0.3-1 Selection of materials for pipe clamp and pipe clamp type gasket

Pipe material Design temperature of pipe/°C Steel plate material Material or grade of bolts and nuts

Low temperature carbon steel (LTCS) -40 to -21 Q345R 35CrMo/30CrMo

Carbon steel/Cr-Mo steel/Stainless steel -20 to 300 Q235B >=Grade 4.8/Grade 4

Carbon steel/Cr-Mo steel/Stainless steel 301 to 425 Q345R 35CrMo/30CrMo

Cr-Mo steel/Stainless steel 426 to 500 15CrMoR 35CrMo/30CrMo

Cr-Mo steel/Stainless steel 501 to 550 12Cr1MoVR 25Cr2MoV

Stainless steel 551 to 700 06Cr19Ni10 06Cr19Ni10

Table 2.0.3-2 Selection of materials for components welded with pipes

Pipe material Design temperature of pipe/°C Lifting lugs, reinforcing plates and welded pipe gasket materials Trunnion material

Low temperature carbon steel (LTCS) -40 to -21 Q345R or same material as pipe Q345E or same material as pipe

Carbon steel -20 to 300 Q235B or same material as pipe Q235B or same material as pipe

301 to 425 Q345R or same material as pipe 20 or same material as pipe

Cr-Mo steel <=500 15CrMoR or same material as pipe 15CrMoG or same material as pipe

501 to 550 12Cr1MoVR or same material as pipe 12Cr1MoVG or same material as pipe

Stainless steel -196 to 700 06Cr19Ni10 or same material as pipe 06Cr19Ni10 or same material as pipe

Table 2.0.3-3 Selection of materials for suspenders, connectors and auxiliary steel structure components

Matching suspender diameter Component materials Auxiliary steel structure materials (section steel and steel plate, etc.)

Suspender Forged piece Non forged piece Bolt/nut grade

<=M30 Q235B or 20 Q235B or 20 Q235B >=Grade 4.8/Grade 4 Q235B

>M30 Q355B or 20 Q355B or 20 Q235B >=Grade 4.8/Grade 4 2.0.4 When replacing materials, in addition to ensuring that the performance indexes of the substitute material are not lower than those of the replaced material, the requirements of the corresponding piping support structure and its usage conditions for the material shall also be comprehensively considered.

3.1 General requirements

3.1.1

The design and selection of piping supports shall comply with the current national standard GB/T 17116.1 Pipe supports and hangers - Part 1: Technical specification.

3.1.2

The selection of expansion bolts and U-shaped bolts shall comply with the following requirements:

1 Expansion bolts shall not be used for fixing pipes with large load and vibration;

2 Insulated pipes shall not be fixed with U-shaped bolts.

3.1.3

The piping supports and polytetrafluoroethylene (PTFE) slide plates shall be set up in accordance with the following requirements:

1 For pipings with a slope greater than 1/100, special piping supports matching with the slope of the piping shall be selected;

2 Cold insulation piping support with nominal size greater than DN600 and high temperature insulation piping support with nominal size greater than DN200 shall be used in combination with PTFE slide plate;

3 Sliding supports with horizontal displacement greater than 75 mm and vertical load greater than 15 kN shall be used in combination with PTFE sliding plates.

3.1.4

When there is horizontal displacement at the lifting point of the hanger, the hanger shall meet the following requirements:

1 The two ends of the suspender shall be hinged;

2 The spacing between two hinge points of rigid hanger suspender shall be set to ensure that the included angle between suspender and vertical line does not exceed 3°;

3 The spacing between two hinge points of elastic hanger suspender shall be set to ensure that the included angle between hanger and vertical line does not exceed 4°.

3.1.5

The markings on the drawings for piping supports shall be clear. See Annex B for relevant examples.

3.2 Allowable loads

3.2.1

The load combination of the piping support shall comply with the requirements of the current national standard GB 50316 Design code for industrial metallic piping.

3.2.2

The service load of the piping support shall not be greater than the allowable load of the piping support.

3.2.3

The allowable load of piping support at different temperatures shall be corrected by load correction coefficient, and the allowable load at intermediate temperatures shall be obtained by interpolation method.

3.2.4

The allowable load of piping support under hydrostatic test may be estimated according to 1.5 times of the allowable load at normal temperature.