Selection of pipe diameter HG/T20570.6—95 Compiled by: Sinopec Beijing Petrochemical Engineering Company Approved by: Ministry of Chemical Industry Implementation date: September 1, 1996 Compiled by: Sinopec Beijing Petrochemical Engineering Company Zhong Shihuan Reviewed by: Sinopec Beijing Petrochemical Engineering Company Yu Haohan Chemical Industry Department Process System Design Technology Center Station Gong Renwei 1 Scope and description 1.0.1 This regulation applies to process and public material pipelines in chemical production equipment, excluding long-distance transportation pipelines in storage and transportation systems, non-Newtonian fluid and solid particle air flow transportation pipelines. 1.0.2 For a given flow rate, the size of the pipe diameter is closely related to the primary investment cost (materials and installation), operating cost (power consumption and maintenance) and depreciation cost of the pipeline system. An economic comparison should be made based on these costs to select the appropriate pipe diameter. In addition, the restrictions of safe flow rate and other conditions should also be considered. The recommended methods and data introduced in this regulation are based on empirical values, that is, using a predetermined flow rate or a predetermined pipeline pressure drop value (set pressure drop control value) to select the pipe diameter, which can be used for estimation in engineering design. 1.0.3 When the pipe diameter is determined according to the predetermined medium flow rate, the following formula is used to preliminarily select the pipe diameter: d=18.81wo.5u d=18. 81Vg 5u-0.5 d-the inner diameter of the pipe, mm; W-the mass flow rate of the medium in the pipe, kg/h, Vo-the volume flow rate of the medium in the pipe, m/h; p-the density of the medium under working conditions, kg/m; u-the average flow rate of the medium in the pipe, m/s. The recommended values of the predetermined medium flow rate are shown in Table 2.0.1. (1.0.3-1) (1.0.3—2) 1.0.4When selecting the pipe diameter according to the pressure drop control value (APn1oo) per 100m of calculated pipe length, the following formula is used to preliminarily determine the pipe diameter: d18.16Wo.38p-0.207μo.033Po.20?or d18.16V.38po.173μo. 0332P8.207u—dynamic viscosity of the medium, Pa·s; APnoo—pressure drop control value per 100m of calculated pipe length, kPa. The recommended AP100 value is shown in Table 2.0.2. 1.0.5Unless otherwise specified, all pressures in this regulation are absolute pressures. (1.0.4—1) 2 Common flow rate ranges of fluids in pipelines and pressure drop control values in general engineering design 2.0.1 Common flow rate ranges of various media in pipelines are shown in Table 2.0.1. The material of the pipelines in the table is steel unless otherwise specified. The flow rates in the table are recommended values. 2.0.2 Pipeline pressure drop control values are shown in Table 2.0.2-1 and Table 2.0.2-2. The pressure drop values in the table are recommended values. Characteristics of Common Flow Rates① Saturated Steam Saturated Steam Superheated Steam Secondary Steam High-Pressure Exhaust Steam Compressed Gas Working Conditions or Pipe Diameter Range DN>200 DN-200~100 DN<100 P200 DN=-200~100 DN<100 When secondary steam is to be used When secondary steam is not to be used Exhaust pipe: Discharge from pressure vessel Discharge from non-pressure vessel P≤0.3MPa (table) P=0.3~0.6MPa (table) P=0.6~1MPa (table) P=1~2MPa(table) P=2~3MPa(table) P= 3~30MPa(table) Flow rate m/s 20~40 80~100 Oxygen generation Semi-water gas Natural gas Flue gas Lime kiln gas Hydrogen-nitrogen mixed gas generation Ethylene gas Acetylene gas properties Hydrogen chloride Working conditions or pipe diameter range P0~0.05MPa(table) P=0.05~0.6MPa( Table) P=0.6~1MPa(table) P=2~3MPa(table) Pipeline length 50~100m P≤0.027MPa P≤0.27MPa P≤0.8MPa P=0.1~0.15MPa(table) Inside the flue Inside the pipeline P=5~10MPa P=2030MPa P=vacuum P<0. 3MPa(table) P<0.6MPa(table) P<2MPa(table)Www.bzxZ.net P=22~150MPa(table) P<0.01MPa(table) P<0.15MPa(table) P<2.5MPa(table) Gas(steel lined rubber pipe) Liquid(rubber pipe) Gas(glass pipe) Liquid(glass pipe) Continued Table 2.0.1 Flow ratem/s| |tt||10~20 4~8(max) max 4 Methyl chloride Vinyl chloride Dichloroethylene Trichloroethylene Ethylene glycol Styrene Dibromoethylene Water and liquids with similar viscosity Tap water Boiler feed water Steam condensate Condensate Superheated water Sea water, slightly alkaline water Oil and liquids with high viscosity Working conditions or pipe diameter range Glass pipe P=0.1~0.3MPa(table) P≤1MPa(table) P<8MPa(table) P≤20~30MPa(table) Main pipe P=0.3MPa(table) Branch pipe P=0.3MPa(table) P>0.8MPa(table) P<0.6MPa(table) Viscosity 0.05Pa· Viscosity 0 .1Pa·s Viscosity iPa· Continued Table 2.0.1 Flow rate m/s 0.3~~0.6 0.5~0.7 0.16~0.25 0.25~0.35 Sodium hydroxide Carbon tetrafluoride Sodium chloride Discharged wastewater Muddy mixture Working conditions or pipe diameter range P=vacuum P≤0.6MPa( Table) P<2MPa (table) Concentration 0~30% 30~50% 50~73% Concentration 88~93% (lead pipe) 93~100% (cast iron pipe, steel pipe) (rubber lined pipe) With solids Without solids Concentration 15% Blower suction pipe Blower discharge pipe Compressor suction pipe Compressor discharge pipe: P10MPa (table) Reciprocating vacuum pump suction pipe Reciprocating vacuum pump discharge pipe Oil-sealed vacuum pump suction pipe Continued Table 2.0.1 Flow rate m/s 1.5~0.8 Water and liquids with similar viscosity Working conditions or pipe diameter range Reciprocating pump suction pipe Reciprocating pump discharge pipe Centrifugal pump suction pipe (normal temperature) Centrifugal pump suction pipe (70~110℃) Centrifugal pump discharge pipe High-pressure centrifugal pump discharge pipe Gear pump suction pipe Gear pump discharge pipe Note: ① The flow rates listed in this table should also be selected in accordance with the corresponding national standards. ② The oxygen flow rate shall refer to the "Design Specifications for Oxygen Stations" (GB50030-91). ③ The hydrogen flow rate shall refer to the "Design Specifications for Hydrogen and Oxygen Stations" (GB50177-93). ④ The acetylene flow rate shall refer to the "Design Specifications for Acetylene Stations" (GB50031-91). Pipeline pressure drop control value for general engineering design Pipeline category Pump inlet pipe Pump outlet pipe: DN40, 50 DN100 and above Steam and gas Public material main pipe Public material branch pipe Compressor inlet pipe: P<350kPa (meter) P>350kPa (meter) Compressor outlet pipe Maximum friction pressure drop kPa /100m Continued Table 2.0.1 Flow rate m/s Table 2.0.2-1 Total pressure drop According to 5% of inlet pressure According to 2% of inlet pressure According to 3% of inlet pressure Pipeline for transporting gas Pipeline for transporting liquid Pressure drop control value for every 100m pipe length (4Pu0) pipe Negative pressure pipeline Note@ P≤49kPa 49kPa Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.