scope:

Applicability

The scope of this recommended practice (RP) is specifically limited to tanks associated with marketing, refining, pipeline and similar facilities containing Class I or Class II petroleum liquids. This RP does not apply to:

• Underground storage tanks

• Aboveground tanks of 1320 U.S. gallons (5000 liters) or less

• Tanks that are integral to a process

• Tanks containing Class III liquids

• Tanks containing non-combustible liquids

• Service stations

• Loading or delivery from wheeled vehicles (such as tank trucks or railroad tank cars)

Relationship of This Recommended Practice to NFPA 30

This document was prepared to include consistency with NFPA 30-2003 Edition, Chapter 4.6, which includes the following requirements:

Aboveground tanks at terminals receiving transfer of Class I liquids from mainline pipelines or marine vessels shall follow formal written procedures to prevent overfilling of tanks utilizing one of the following methods of protection:

1. Tanks gauged at frequent intervals by personnel continuously on the premises during product receipt with frequent acknowledged communication maintained with the supplier so that flow can be promptly shut down or diverted.

2. Tanks equipped with a high-level detection device that is independent of any tank gauging equipment. Alarms shall be located where personnel who are on duty throughout product transfer can promptly arrange for flow stoppage or diversion.

3. Tanks equipped with an independent high-level detection system that will automatically shut down or divert flow.

4. Alternatives to instrumentation described in 4.6.1.1(2) and 4.6.1.1(3), where approved by the authority having jurisdiction as affording equivalent protection.

Instrumentation systems covered in 4.6.1.1(2) and 4.6.1.1(3) shall be electrically supervised or equivalent.

Formal written procedures required 4.6.1.1 shall include the following:

1. Instructions covering methods to check for proper line-up and receipt of initial delivery to tank designated to receive shipment.

2. Provisions for training and monitoring the performance of operating personnel by terminal supervision.

3. Schedules and procedures for inspection and testing of gauging equipment and high-level instrumentation and related systems. Inspection and testing intervals shall be acceptable to the authority having jurisdiction but shall not exceed 1 year.

Note: Reprinted with permission from NFPA 30-2003 Flammable and Combustible Liquids Code, Copyright © 2003, National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.