Standard No.:	AQ 3053-2015
English Name:	Safety technical code for vertical cylindrical steel welded tank
Chinese Name:	立式圆筒形钢制焊接储罐安全技术规范
Chinese Classification:	C68    Production equipment safety technology
Professional Classification:	AQ
ICS Classification:	25.160.30 25.160.30    Including thermal cutting equipment 25.160.30
Issued by:	State Administration of Work Safety
Issued on:	2015-03-06
Implemented on:	2015-9-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	15000 words
Price(USD):	700.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the basic safety requirements for materials, design, pre-fabrication, construction & acceptance, lighting protection, static protection, anti-corrosion and use management, inspection of the vertical cylindrical steel welded tank as well as its safety accessories. This standard is applicable to the vertical cylindrical steel welded tank with design pressure less than 0.1MPa(G) and nominal volume greater than or equal to 1000m3, which is built on the ground, stores petroleum, petroleum products or chemical liquid media with non-extreme or non-high toxicity, and is subjected to on-site assembly welding. It may be referenced for tanks with nominal volume less than 1000m3 and other similar liquid media. The scope of the tank to which this standard applies includes a tank body, flange covers for safety accessories and tank connecting pipes, sealing gaskets and fasteners of the sealing gaskets. This standard does not apply to frozen cryogenic tanks. 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 50057 Code for design protection of structures against lightning GB 50074 Code for design of oil depot GB 50128 Code for construction of vertical cylindrical steel welded storage tanks GB 50160-2008 Fire prevention code of petrochemical enterprise design GB 50183 Code for fire protection design of petroleum and natural gas engineering GB 50236 Code for construction of field equipment, industrial pipe welding engineering GB 50341 Code for design of vertical cylindrical welded steel oil tanks GB 50493 Specification for design of combustible gas and toxic gas detection and alarm for petrochemical industry GB 50650 Code for design protection of petrochemical plant against lightning AQ 3028 Safety code for operation at confined spaces in chemical manufactory HG 20660 Standard for classification on hazards of toxicity and explosion of chemical mediums in pressure vessel GBZ 230 Classification for hazards of occupational exposure to toxicant JB/T 4730 NDT of pressure equipments JB/T 10764 Non-destructive testing - Acoustic emission testing and evaluation of atmospheric pressure metal storage tanks JB/T 10765 Non-destructive testing - Magnetic flux leakage testing of atmospheric pressure metal storage tanks NB/T 47014 Welding procedure qualification for pressure equipment NB/T 47018 Technical permission of welding materials for pressure equipment SH/T 3007 Design specification for tank farms of storage and transportation system in petrochemical industry SH/T 3026 Standard for aseismic appraisal of atmospheric vertical cylindrical storage steel tanks SY/T 6620 Tank inspection, repair, alteration and reconstruction TSG Z6002 Examination rules for welding operators of special equipment API Std 2000 Venting Atmospheric and Low Pressure Storage Tanks (Nor-refrigerated and Refrigerated) 3 Terms, definitions and abbreviations For the purposes of this document, the following term, definition and abbreviations apply. 3.1 Terms and definitions 3.1.1 tank body tank body includes: a) beveled end face of the first circumferential joint in welded connection with an outer pipeline; b) end face of the first threaded joint in threaded connection; c) first flange sealing surface in flanged connection; d) first sealing surface connected with a special connecting piece or a pipe fitting; e) connection welds between the tank and non-pressure elements. The main pressure elements in the tank body include roof, shell, tank bottom, connecting pipes and pipe flanges with nominal diameter greater than or equal to 250mm 3.1.2 safety accessory safety accessory of the storage tank includes safety valve/breathing valve, emergency cut-off device, safety interlock device, pressure gauge, liquid level meter, thermometer, flame arrester 3.1.3 design positive pressure set maximum pressure of the gas-phase space of roof, which, together with corresponding design temperature, is taken as the design load condition 3.1.4 design negative pressure set maximum external pressure (excluding the external pressure caused by wind load) bore by the tank or the maximum local vacuum degree in the tank. Design negative pressure shall not be less than the maximum local vacuum degree possibly achieved in the tank (its value shall be determined by the vacuum degree formed by a vacuum relief valve at the maximum specified flow rate) 3.1.5 design temperature under normal working condition of the tank, the set metal temperature (average temperature along the section thickness of an element) of a tank shell plate and a stressed element shall be taken as the design load condition together with corresponding design pressure. 3.1.6 large storage tanks tanks with nominal diameter greater than or equal to 30m or nominal volume greater than or equal to 10000m3 3.1.7 internal inspection inspection conducted on various parts or components such as tank bottom after the medium in the tank is emptied, during which an inspector usually needs to enter the tank 3.2 Abbreviations 3.2.1 RBI: Risk Based Inspection 3.2.2 WPS: Welding Procedure Specification 3.2.3 TOFD: Time of Flight Diffraction

Foreword I 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 4 General 5 Materials 6 Design 7 Prefabrication, construction and acceptance 8 Lightning protection and static protection 9 Anti-corrosion 10 Utilization management 11 Tank inspection 12 Safety accessories Annex A (Normative) Classification of tank pressure grade Annex B (Normative) Classification method of storage tanks Annex C (Informative) Tank product nameplate Annex D (Informative) Tank product data sheet Annex E (Informative) Fire hazard classification Annex F (Informative) Tank product certificate Annex G (Normative) Tank code numbering method Figure C.1 Tank product nameplate Figure G.2 Schematic diagram of equipment code Table D.1 Tank product data sheet Table E.1 Fire hazard classification of flammable liquid Table F.1 Tank product certificate