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" J AMERICAN NATIONAL STANDARD K61.1-1981 locked when the installation is unattended.If the other water damage shall be provided wherever facility is protected against tamperingby fencing high flood water might occur. or other suitable means, valve locks are not 4.2.3 Tanks for product storage at less than 32 required. F (0 C)shall be supported in such a way,or heat 3.7.2 All connections to underground con- shall be supplied,to preventthe effects of freezing tainers should be located within a substantial and consequent frost heaving. dome, housing or manhole fitted with a sub- 4.2.4 The area surrounding a refrigerated stantial removable cover. Appurtenances shall tank orrou of tanks shall be provided with also be protected during the transit of containers drainage or shall be diked to prevent accidental intended for installation underground. discharge of liquid from spreading to uncon- 3.7.3 Storage containers need not be grounded. trolled areas. 3.8 Identification 4.2.5 When drainage is employed, a slope of not less than one percent shall be provided.The 3.8.1 A sign shall be displayed in a conspicuous drainage system shall terminate in an impound- place stating the name, address, and phone ingbasin having a capacity aslarge as the largest number of the nearest representative, agent, or tank served. owner of the storage system. 4.2.6 Provision shall be made for drainage or 4. REFRIGERATED STORAGE rain water from the diked or impounding area. Such drainage shall not permit the release of This section applies specifically to systems ammonia. utilizing tanks for the storage of anhydrous 4.2.7 When a dike surrounding the tank is ammonia under refrigerated conditions.All Basic employed, the capacity of the diked enclosure Rules of Section 2 appy to this section unless shall be as large as the largest tank served. inconsistent with the requirements of this section. 4.2.8 The walls of a diked enclosure or the wall '- ♦ of an impounding basin used in a drainage 4.1 Design of Tanks system shall be of earth,steel or concrete designed 4.1.1 Tanks may be designed for any storage tobeliquidtightandtowithstandthehydrostatic pressure desired as determined by economicalpressure and the temperature.Earth walls shall design of the refrigerated system. have a flattop at least 2 feet wide.The slope shall 4.1.2 The design temperature shall be the be stable and consistent with the angle of repose minimum temperature to which the container of the earth used. will be refrigerated and shall be so designated. 4.2.9 The ground in an impounding basin or Within a diked enclosure, should be graded so 4.1.3 Containers with a design pressure exceeding 15 psig(103 kPa)shall be constructed that small spills,or the early part of a large spill, in accordance with 2.2 and the material shall be will accumulate at area of g or and acorner contacting a selected from those listed in API Standard 620, relatively small area a ground and exposing a Recommended Rules for Design and Construction relatively small surface area for heat gam. Shallow channels in the ground surface or low of Large, Welded, Low-Pressure Storage Tanks, curbs of earth can help guide the liquid these Tables 2.02, R.2.1, R.2.2, R.2.3 or R.2.4. g low areas without contacting a large ground 4.1.4 Tanks with a design pressure of 15 sig area. (103 kPa) and less shall be constructed in accordance with the general requirements of 4.3 Marking Refrigerated Containers API Standard 620, including Appendix R. 4.3.1 Each refrigerated container shall be 4.1.5 When austenitic steels or nonferrous marked with a nameplate on the outer covering materials areused,theASME Codeshallbe used in an accessible place asspeclfiedinthe following: as a guide in selection of materials for use at the 4.3.1.1 With the name and address of the design temperature. builder and the date of fabrication. 4.2 Installation of Storage Tanks 4.3.1.2 With the maximum volume or weight 4.2.1 Tanks shall be supported on suitable non- of the product whichever is most meaningful to combustible foundations designed to accommo- user. date the type of tank being used. 4.3.1.3 With the design pressure. 4.2.2 Adequate protection against flotation or 4.3.1.4 With the minimum temperature in 18