ANSI API St 2350-2020 pdf free download – Overfill Protection for Storage Tanks in Petroleum Facilities.
1.1 Scope
The scope of this standard is intended for storage tanks associated with marketing, refining, pipeline and terminals containing Class I or Class II petroleum liquids. Use is recommended for Class III petroleum liquids. This standard does not apply to:
— underground storage tanks;
— aboveground tanks of 1320 US gallons (5000 liters) or less;
— aboveground tanks which comply with PEI 600;
— pressure vessels;
— tanks containing non-petroleum liquids;
— tanks storing LPG and LNG;
— tanks at service stations;
— tanks filled exclusively from wheeled vehicles (i.e. tank trucks or railroad tank cars); and
— tanks covered by OSHA 29 CFR 1910.119 and EPA 40 CFR 68 or similar regulations.
This standard recommends application of PEI Recommended Practice 600 Recommended Practices for Overfill Prevention for Shop-Fabricated Aboveground Tanks for overfill protection where applicable for aboveground tanks falling outside the scope of this document.
1.2 Purpose
The purpose of this standard is to assist owner/operators and operating personnel in the prevention of tank overfills by implementation of a comprehensive overfill prevention process (OPP). The goal is to receive product into the intended storage tank without overfill or loss of containment.
1.3 Minimum Requirements
This standard is one of minimum requirements. Alternate approaches or variations on the principles of this standard that provide equivalent or more robust overfill prevention are acceptable.
Alternate approaches may be needed when the tank system varies from the typical configurations described in this standard. The rationale for the implementation of each overfill prevention process (OPP) should be documented and retained by the owner and operator.
2 Normative References
There are no references designated as normative for this document.
References included in various locations in the document and in the Bibliography are provided for information only and are not normative parts of this standard.
3 Terms and Definitions
For the purposes of this document, the following definitions apply:
NOTE Users of prior editions of API 2350 should note that several definitions and terms that have changed are important to the implementation and use of this standard.
3.1 alarm
Alarms require action. They are audible and visible means of indicating to operating personnel an abnormal condition requiring a specific response (high tank level, equipment malfunction or process deviation) (see 5.1.2).
3.1.1 diagnostic alarm
An 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. This is sometimes called a “trouble alarm” (see 5.1.2.2).
3.2 alert
Alerts are audible and visible notification indicating an equipment or process condition that requires awareness.
NOTE 1 For this standard, alerts do not require specific action (see 5.1.3).
NOTE 2 At their discretion, companies may choose to establish required action as a response to an alert.
3.3 AOPS level
The tank level at which the AOPS system is activated (see 4.4.2.4).
3.4 attendance
The term describing when personnel are physically on site at the facility where the tanks are located during receiving operations.
3.4.1 fully-attended (locally monitored) facility
Assigned personnel are on the premises continuously during the entire receipt of products from pipelines or marine vessels. Personnel on site either have the ability to terminate the receipt for the tank of concern or are in constant contact with people who have the ability to terminate the receipt for the tank of concern.
3.4.2 semi-attended (locally and remotely monitored) facility
Assigned personnel are on the premises (at a minimum) during the initial and final portions of the receipt of products from pipelines.
3.4.3 unattended (remotely monitored) facility
A facility not requiring assigned personnel to be on the premises during any part of a receipt of products from pipelines. Personnel at local or remote control centers monitor the receipts using “real time” data with the ability to terminate the receipt for the tank of concern.ANSI API St 2350 pdf download.