API STD 625-2010 pdf download

API STD 625-2010 pdf download.Tank Systems for Refrigerated Liquefied Gas Storage.
1.5 Concrete Containers Concrete container materials, design, construction, inspection, examination, and testing shall be in accordance with ACI 376. 1.6 Boundaries 1.6.1 This standard applies to tank system components attached to and located within the liquid, vapor, and any purge gas containers (but excluding dike walls). Piping connected externally to the liquid, vapor, and any purge gas containers within the following limits shall be constructed according to this standard. a) The face of the first flange in bolted flanged connections; b) The first threaded joint on the pipe outside the tank wall in threaded pipe connections; c) The first circumferential joint in welding-end pipe connections that do not have a flange located near the tank. 1.6.2 The boundary of this standard may be extended as agreed between Purchaser and Tank System Contractor to complete, external, pressure containing piping connections (such as relief valves in 7.4 and instrumentation in 7.5) which serve only the tank system.
3.1 General For the purposes of this document, the following definitions apply. 3.2 Definitions 3.2.1 Storage Concepts 3.2.1.1 double containment tank system See 5.2. 3.2.1.2 full containment tank system See 5.3. 3.2.1.3 refrigerated tank system The combination of a primary liquid container, together with secondary liquid container (if any), insulation, vapor container, appurtenances, instrumentation, and all other elements within the scope of this standard. 3.2.1.4 single containment tank system See 5.1. 3.2.2 Components 3.2.2.1 annular space The space between the primary cylindrical liquid container and the primary cylindrical product vapor container or cylindrical purge gas container of a double wall tank . 3.2.2.2 base heating system A heating system provided in the base slab or soil below the tank system to prevent freezing of the soil and frost heave. 3.2.2.3 base slab A continuous concrete base supporting the tank system. This base may be either at grade or elevated and may be either supported by soil or piles. 3.2.2.4 dike wall A structure remote from the tank system used to establish an impounding area for the purpose of containing any accidental spill of stored liquid. Sometimes this structure is referred to as a bund wall. 3.2.2.5 elevated foundation A foundation with base slab, supported by either piles or piers (stub columns), located at an elevation above grade, leaving an air gap between the grade and the bottom of the base slab.
3.2.2.6 load bearing insulation Insulation with special compressive strength properties used for thermal insulation and for transferring the load to the load bearing structure. 3.2.2.7 primary liquid container Parts of a tank system that contain the liquid during normal operation. 3.2.2.8 primary vapor container Parts of a tank system that contain the product vapor during normal operation. 3.2.2.9 pump column A pipe column to house a combined vertical pump and close coupled electric motor. The column itself protrudes through the outer tank roof. 3.2.2.10 purge gas container Parts of a tank system that contain only purge gas and are not expected to function after exposure to product temperature. (This includes outer container of double roof single containment tank system.) 3.2.2.11 refrigerated temperature roof A roof that contains product vapor and is near the liquid product temperature during normal operation. (This includes inner roofs of double roof tanks and single roofs of tanks with external roof insulation.) 3.2.2.12 secondary liquid container Parts of a tank system that contain the liquid in the event of leakage from the primary liquid container. 3.2.2.13 suspended deck Structure suspended from the fixed roof for supporting the internal insulation above the primary liquid container. 3.2.2.14 thermal corner protection A thermally insulating and liquid tight structure in the bottom annular section of a tank system to protect the secondary liquid container against low temperatures in the event of leakage from the primary container. 3.2.2.15 vapor barrier A barrier to prevent entry of water vapor (moisture) and other atmospheric gases into insulation or into the secondary container. This also prevents the product vapor escaping from the secondary container. 3.2.2.16 warm product vapor container Parts of a tank system that contain product vapor, but are not expected to function after exposure to refrigerated product temperature.