pressure Storage Sphere Purchasing inspection

API 2510 “Design and Construction of LPG Installations” Sixth Edition April 1989 NFC (NFPA) (National Fire Codes (National Fire Protection Association))

NFC 59 A “Standard for the Production,Storage and Handling of Liquefied Natural Gas (LNG).”

3. UNITS

International system of units (SI) in accordance with Ixxx  shall be used. Whenever reference is made to API/ASME or any other Standards, equivalent SI unit system for dimensions, fasteners and flanges shall be substituted.

For pipe size the international nomenclature “diameter nominal” written as DN 15, 25, 40, 50, etc. has been used in accordance with ISO 6708-1980. ANSI/ASME B16.5-1981 and ANSI/ASME B31.3-1983 Also for pipe flanges pressure temperature ratings “pressure nominal” written as PN 20, 50, 68, etc. has been used in accordance with said Standards.

4. Material SELECTION

4.1 All material of construction for Pressure Storage Spheres shall meet the requirements of Section II of the ASME Boiler and Pressure Vessel Code.

4.2 The following requirements are supplementary:

4.2.1 The selector of the material of construction for pressure parts and their integral attachments shall take into account the suitability of the material with regard to fabrication and to the conditions under which they will eventually operate.

4.2.2 Special consideration should be given to the selection of materials for pressure Storage Spheres designed to operate below 0°C. Austenitic stainless steels and aluminum alloys are not susceptible to low stress brittle fracture and no special requirements are necessary for their use at temperatures down to -196°C.

4.2.3 Some Carbon Steel material for construction of pressure storage spheres for normal services are given in Table 1.

4.2.4 Casting shall not be used as pressure components welded to the shell of pressure storage spheres.

4.2.5 Materials having a specified minimum yield strength at room temperature greater than 483 mPa (70,000 Psi) shall not be used without prior approval of the Owner’s Engineer.

4.2.6 Materials of non-Pressure Retaining Parts to be welded directly to pressure retaining parts shall be of the same material as the pressure retaining parts.

4.2.7 Material of attachments other than those mentioned in para.4.2.6 above, such as lower support columns, platforms, stairways, pipe supports, insulation support rings, shall be carbon steel of ASTM A 283 Gr.C or equivalent. External non-pressure retaining part boltings shall be carbon steel of ASTM A 307 Gr. B or equivalent.

4.2.8 The internal bolts and nuts including U-Bolts shall be of type 410 or 405 stainless steel material.

4.2.9 Material of anchor bolts shall be carbon steel of ASTM A 307 Gr.B. or equivalent.

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