API Std 625-2014 Tank Systems for Refrigerated Liquefied Gas Storage

API STANDARD 625, Tank Systems for Refrigerated Liquefied Gas Storage, August 2010, 74p, 1st Ed. ADDENDUM 1, JULY 2013, ADDENDUM 2, NOVEMBER 2014This standard covers low pressure, above ground, vertical, and cylindrical tank systems storing liquefied gases requiring refrigeration. This standard provides general requirements on responsibilities, selection of storage concept, performance criteria, accessories/appurtenances, quality assurance, insulation, and commissioning of tank systems.Additional information and recommendations are given in annexes. These general requirements address issues common to all of these tank systems, issues involving coordination of the components of the tank system, and issues of the tank system acting in an integrated way. The detailed requirements applicable to the metallic and concrete containers respectively are contained in the standards named in 1.4 and 1.5.The annexes of this standard provide additional information that may be used in the selection and design of refrigerated tank systems.CoverageThis standard covers tank systems having a storage capacity of 800 cubic meters (5000 bbls) and larger.Stored product shall be liquids which are in a gaseous state at ambient temperature and pressure and require refrigeration to less than 5 °C (40 °F) to maintain a liquid phase.Tank systems with a minimum design temperature of –198 °C (–325 °F) (see note), a maximum design internal pressure of 50 kPa (7 psig), and a maximum design uniform external pressure of 1.75 kPa (0.25 psig) are covered.NOTE Note for concrete containers, that ACI 376 states it "has been developed with the lowest operating temperature of –168 °C (–270 °F). However lower product temperatures could also be used, provided appropriate additional engineering analysis and justification is performed for each proposed application."Scope
Normative References
Terms and Definitions
Responsibilities
Selection of Storage Concept
Design and Performance Criteria
Accessories and Appurtenances
Quality Assurance and Quality Control
Insulation
Post Construction Activities
Marking
Annex A (informative) - Properties of Gases
Annex B (informative) - Recommendations on Foundation
Settlement
Annex C (informative) - Commentary On Storage Concepts
Annex D (informative) - Recommendations on Selection of
Storage Concept Based on Assessment
of Risk
Annex E (informative) - Inquiries and Suggestions for Change