1 Scope
1.1 This part in NB/T 47003 specifies the requirements in design, manufacture, inspection and acceptance of silos for solid materials (hereinafter referred to as silos).
1.2 This part is applicable to steel or aluminium made welded vertical circular silos used for storing solid bulky materials, which the volume is greater than 15m3, the design pressure is larger than -500Pa and less than 0.1MPa, and the design temperature is the service temperature required by silos shell material.
The silos which the parameters exceed above parameter range may be designed and manufactured by reference to this part.
1.3 This standard is not applicable to the following siloses:
a) Silos directly embedded underground;
b) Siloses storing extremely or highly toxic medium;
c) Bunkers moved often;
d) Bunkers which the volume is less than or equal to 15m3.
2 Normative References
The following referenced documents are indispensable references, only the edition cited applies. For the dated normative references, only the dated editions are applicable to this document. For undated references, the latest edition of the normative document (including all the amendments) referred to applies.
GB 150 Steel Pressure Vessels
GB/T 699-1999 Quality Carbon Structural Steels
GB/T 700-2006 Carbon Structural Steels (GB/T 700-2006, ISO 630:1995, NEQ)
GB 713-2008 Steel Plates for Boiler and Pressure Vessels (GB 713-2008, ISO9328-2: 2004, NEQ)
GB 912-2008 Hot-rolled plates and strips of carbon structural steels and high strength low alloy structural steels (GB 912-2008, ISO4995:2001(E), ISO 4996:1999(E), NEQ)
GB/T 983-1995 Stainless Steel Covered Electrodes
GB/T 985.1-2008 Recommended Joint Preparation for Gas Welding Manual Metal Arc Welding Gas-shield Arc Welding and Beam Welding (GB/T 985.1-2008, ISO 9692-1:2003, MOD)
GB/T 1220-2007 Stainless steel bars
GB/T 3077-1999 alloy structure steels
GB/T 3091-2008 Welded steel pipes for low pressure liquid delivery (GB/T 3091-2008, ISO 559:1991, NEQ)
GB/T 3274-2007 Hot-rolled plates and strips of carbon structural steels and high strength low alloy structural steels
GB/T 3280-2007 Cold rolled stainless steel plate sheet and strip
GB/T 3880.1-2006 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - part 1: Technical conditions of delivery
GB/T 3880.2-2006 Wrought aluminium and aluminium alloy plate sheets and strips for general engineering - part 2: mechanical properties
GB/T 3880.3-2006 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - part 3: Tolerances on forms and dimensions
GB/T 4237-2007 Hot rolled stainless steel plate sheet and strip
GB/T 5117-1995 Carbon Steel Covered Electrodes
GB/T 5118-1995 Low alloy steel covered electrodes
GB/T 5293-1999 Carbon steel electrodes and fluxs for submerged arc welding
GB 6479-2000 Seamless steel tubes for high-pressure for chemical fertilizer equipments (GB6479-2000, ISO9329-2:1997, NEQ)
GB/T 6893-2000 Aluminium and aluminium alloy cold drawn (rolled) seamless tubes
GB/T 8162-2008 Seamless steel tubes for structural purposes
... ...
... ...
3 Terms and Definitions
The following terms and definitions are applicable to this Part of NB/T 47003.
3.1
Pressure
All shall be gauge pressure except ones noted.
3.2
Operating pressure
Operating pressure is referred to the maximum pressure on the top of the vessel under normal operating conditions.
3.3
Design pressure
Design pressure is referred to the maximum pressure on the top of silos, and it is not lower than the operating pressure.
3.4
Metal temperature
Metal temperature is referrers to the average temperature along the metal sections of the vessel components.
In any case, the surface temperature of the component metal must not exceed the allowable service temperature of the metal material.
3.5
Design temperature
Design temperature is referred to the set metal temperature of a component part under normal operating conditions, and the value hereof must not be lower than the possible maximal metal temperature of the component metal under operating conditions. as for the metal temperature under 0℃, the design temperature must not be higher than the minimal temperature the component metal may reach.
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 General Provisions
5 Materials
6 Design Calculation
8 Manufacturing, Inspection and Acceptance of Aluminium Silos
Annex A (Informative) Structure of Siloses for Solid Materials
