Standard No.:	SH/T 3406-2022
English Name:	Specification for steel pipe flanges in petrochemical engineering
Chinese Name:	石油化工钢制管法兰技术规范
Professional Classification:	SH    Professional Standard - Petrochemical
Issued by:	MIIT
Issued on:	2022-04-08
Implemented on:	2022-10-1
Status:	valid
Superseded by:	SHT3406-2022
Superseding:	SH/T 3406-2013 Steel pipe flanges in petrochemical industry [Quasi-Official / Academic version - scanned PDF, translated by Standard Committee / Research Institute in China]
Language:	English
File Format:	PDF
Word Count:	40000 words
Price(USD):	1400.0
Delivery:	via email in 1 business day

Specification for steel pipe flanges in petrochemical engineering 1 Scope This standard specifies the nominal diameter, nominal pressure, types, dimensions, tolerances, material, pressure-temperature ratings, manufacture, inspection and marking requirements of steel pipe flanges. This standard is applicable to the manufacture and acceptance of steel pipe flanges in petrochemical engineering. 2 Normative references The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 711 Hot-rolled quality carbon structural steel plates sheets and strips GB/T 713 Steel plates for boilers and pressure vessels GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels GB/T 3531 Steel plates for low temperature pressure vessels GB/T 24511 Stainless steel and heat resisting steel plate, sheet and strip for pressure equipments GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing NB/T 47008 Carbon and alloy steel forgings for pressure equipment NB/T 47009 Alloy steel forgings for low temperature pressure equipment NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment SH/T 3401 Nonmetallic flat gaskets for steel pipe flanges in petrochemical industry SH/T 3402 Polytetrafluoroethylene envelope gaskets for steel pipe flanges in petrochemical industry SH/T 3403 Metallic ring joint gaskets for steel pipe flanges in petrochemical industry SH/T 3404 Fasteners for steel pipe flanges in petrochemical industry SH/T 3405 Series of steel pipe size in petrochemical industry SH/T 3407 Spiral wound gaskets for steel pipe flanges in petrochemical industry ASME B16.5 Pipe flanges and flanged fittings ASME B16.47 Large diameter steel flanges ASTM A105/A105M Standard specification for carbon steel forgings for piping applications 3 General requirements 3.1 Nominal diameter and outer diameter of steel pipe Nominal diameter and outer diameter of the steel pipe applicable to the flanges shall be determined based on those specified in Table 3.1. Table 3.1 Nominal diameter and outer diameter of the steel pipe 3.2 Nominal pressure The nominal pressure of flanges is divided into eight classes: Class 75, Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 and Class 2500. The range of nominal diameters corresponding to each nominal pressure class shall meet those specified in Table 3.2. Table 3.2 Nominal diameter ranges for corresponding nominal pressure classes   3.3 Flange types 3.3.1 Flanges are classified into weld neck flanges, slip-on flanges, socket welding flanges, lap joint flanges, threaded flanges, and blind flanges, the codes of which shall meet those specified in Table 3.3.1. Table 3.3.1 Types and codes of flanges Type of flange Code Type of flange Code Weld neck flange WN Lap joint flange LJ Slip-on flange SO Threaded flange PT Socket welding flange SW Blind flange BL 3.3.2 Flange sealing faces are classified into raised face, flat face, female and male face, tongue and groove face, and ring joint face, the codes of which shall meet those specified in Table 3.3.2. Table 3.3.2 Types and codes of sealing faces Type of sealing face Code Raised face RF Flat face FF Female and male face MF (with LF for female face, and LM for male face) Tongue and groove face TG (with GF for groove face and TF for tongue face) Ring joint face RJ 3.3.3 The applicable range for types of flanges with a nominal diameter less than or equal to DN 600 shall meet those specified in Table 3.3.3. Table 3.3.3 Applicable range for types of flanges with a nominal diameter less than or equal to DN 600

Foreword i 1 Scope 2 Normative references 3 General requirements 3.1 Nominal diameter and outer diameter of steel pipe 3.2 Nominal pressure 3.3 Flange types 3.4 Flange facing finish 4 Flange types, dimensions and tolerances 4.1 Types and dimensions of flanges with a nominal diameter less than or equal to DN 4.2 Lap joint flange and lap joint stub ends 4.3 Sealing face size of flanges with male and female faces (MF face flanges) and tongue and groove faces (TG face flanges) 4.4 Types and dimensions of Series A flanges with a nominal diameter greater than DN 4.5 Types and dimensions of Series B flanges with a nominal diameter greater than DN 4.6 Tolerances 4.7 Flange welding ends configuration dimensions 5 Materials 5.1 General requirements 5.2 Technical requirements 6 Manufacture and heat treatment 6.1 Manufacture 6.2 Heat treatment 7 Inspection and tests 7.1 Inspection 7.2 Tests 8 Product quality certificate 9 Marking, protection and packaging 9.1 Marking 9.2 Protection and packaging Annex A (Normative) Pressure-temperature ratings Annex B (Informative) Length of fasteners Explanation of wording in this standard