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API 650 – ASTs (cont’d) • For Open Top Tanks with Floating Roofs • Appendix C Section C.3.7 covers rolling ladders and it was recently added “…Ladders shall be grounded to both the roof and the gauger’s platform with at least an AWG 2/0, non-tangible cable. Cable shall be configured so that it will not freeze to adjacent surfaces in cold weather…”. 09/11/2009 Grounding <strong>Standards</strong> 8
API 650 – ASTs (cont’d) • For Fixed Cone Roof Tanks with Internal Floating Roofs • Appendix H Section H.4.1.6 states that all conductive parts shall be grounded and to use either shunts or cable to ground the floating roof to the shell • Recently added “…The choice of bonding devices shall be specified by the Purchaser on the Data Sheet, Line 32, considering strength, corrosion resistance, joint reliability, flexibility, and service life. All movable cover accessories (hatches, manholes, pressure relief devices, and other openings) on the internal floating roof shall be electrically bonded to prevent static electricity sparking when they are opened. 09/11/2009 Grounding <strong>Standards</strong> 9
Page 1 and 2: Update to Industry Grounding Standa
Page 3 and 4: Background • Metallic structures
Page 5 and 6: Codes Addressing Bonding for ASTs
Page 7: API 650 - ASTs (cont’d) • For O
Page 11 and 12: NFPA 780 - Standard for the Install
Page 13 and 14: API RP 2003 - Protection Against Ig
Page 15 and 16: API RP 2003 - Protection Against Ig
Page 17 and 18: Working Document API RP 545 - Light
Page 19 and 20: Working Document API RP 545 - Light

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