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As per OISD-STD-118, petroleum storage tank shall be located in dyked enclosure with roads all around the enclosure. Now our products are Class C i.e. excluded petroleum products and some of them are stored in atmospheric tank and some of them in Vessels, so do we need dyked enclosure for products stored in "VESSELS" ? or any other sort of protection is required in event of spill over scenario.
Thanks in advance.
 
Answers
15/07/2009 A: Neeraj Bagai, HMEL, neeraj68b@yahoo.com
Clause 7.1 of OISD STD 118 clearly ask for dyke around storage tanks whether it is class A, B or C/ excluded group.
25/04/2008 A: KengYong Chan, Air Products & Chemicals, Inc, chanky@apci.com
If it is not mandated by codes or local regulations for dyking or spill containment, it comes down to good engineering practice and design.
Questions to ask, is the vessel materials considered hazardous, both in terms of environment or safety (flammable, toxic etc). If so, it is always a good engineering practice to have dyke or containment around vessel, or catch basin around storage tanks or vessels for environmentally hazardous materials.
Alternatively, if one is concerned about overflow, one can design for high level interlock with alarm and/or redundancies.