API STD 2350-2020 pdf free download

API STD 2350-2020 pdf free download.Overfill Prevention for Storage Tanks in Petroleum Facilities.
3 Terms, Definitions, and Acronyms 3.1 Terms and Definitions For the purposes of this document, the following terms and definitions apply: 3.1.1 abnormal operation Any operation that is not based on procedures developed for normal operating conditions, including but not limited to operating without normal utility power, operating without the LAH or LAHH alarms as applicable, operating while there are temporary arrangements for the piping, tank, or its instrumentation that are in effect, etc. 3.1.2 alarm Audible and visual means of indicating an abnormal condition or potential emergency that requires a specific response or action by operating personnel. 3.1.3 alert Audible or visual notifications indicating an equipment or process condition that requires awareness. Alerts may not require specific action. Alerts may indicate need for investigation or owner/operator-defined action. 3.1.4 atmospheric tank A storage tank with internal design pressures not more than 17.2 kPa (2½ psig). 3.1.5 attendance The term describing when personnel are physically on site at the facility where the tanks are located during receiving operations. Personnel on site have the ability to monitor the tank level and either have the ability to terminate the receipt or are in real-time contact with people who have the ability to terminate the receipt. 3.1.5.1 fully-attended facility A competent person is on site continuously during the entire receipt or transfer of products. 3.1.5.2 semi-attended facility At a minimum, a competent person is on site during the first and last 30 minutes of the receipt of products or transfer operations (first denoted by the flow of product, last denoted by the termination of flow). 3.1.5.3 unattended facility A competent person is not required to be on site during any part of a receipt or transfer of products.
3.1.9 capacity The volume (amount) of product contained in a tank at designated levels [i.e. the levels of concern (LOCs)]. 3.1.10 Class I liquid As defined in NFPA 30, i.e. a liquid that has a flash point below 100 °F (37.8 °C). 3.1.11 Class II liquid As defined in NFPA 30, i.e. any liquid that has a flash point at or above 100 °F (37.8 °C) and below 140 °F (60 °C). 3.1.12 competent person An individual who is trained, capable, and able to perform the assigned duties as determined by the owner/operator. 3.1.13 continuous level sensor A mechanical or electronic level sensor designed to measure the liquid level in a storage tank without personnel action. 3.1.14 control center Locally or remotely manned operating center that can monitor, control, and terminate operations at the subject facility. 3.1.15 Critical High (CH) level The highest level in the tank that product can reach without detrimental impacts (i.e. product overflow or tank damage). 3.1.16 dedicated relief tank A tank that does not store product on a normal basis, but is used to hold product during pipeline pressure relief events. 3.1.17 diagnostic alarm Indication that there has been a malfunction of equipment. It applies to any condition affecting the proper operation of instrumentation, control, or alarm systems (including power outages) that requires operating personnel response. 3.1.18 electrically supervised OPS instrumentation that is electronically self-checking to indicate when communication between the sensor, logic solver, or final element has failed and can generate a diagnostic alarm. 3.1.19 facility A location with tanks within the scope of this standard. 3.1.20 final element Block valves, diversion valves, pumps, or other equipment that terminates flow to prevent tank overfilling. 3.1.21 High-High tank level alarm (LAHH) An alarm generated when the product level reaches the High-High (HH) tank level.
3.1.22 High-High (HH) tank level A level sufficiently below the Critical High (CH) level to enable termination of a receipt or transfer before the Critical High (CH) level is reached. 3.1.23 incident An event with undesirable consequences affecting safety, health, the environment, or financial impact to the facility. 3.1.24 independent alarm An alarm function separate from the device or system used for routine operational tank level measurement. 3.1.25 level of concern (LOC) Calculated product level in a tank that allows the owner/operator to determine appropriate levels to set alerts, alarms, or AOPS functions. 3.1.26 local Located or operated on-site at a facility. 3.1.27 manual overfill prevention system (MOPS) An overfill prevention system requiring operating personnel to terminate receipt. 3.1.28 marine vessel A barge or tanker ship that can deliver product directly into petroleum facility tanks (usually through temporary connections to facility pipelines). 3.1.29 maximum fill rate (in./hr) The rate of liquid level rise in the tank at the maximum flow rate, excluding outflow from the tank.