California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 20 - Flammable Liquids, Gases and Vapors
Article 145 - Tank Storage
Section 5585.1 - Liquid Level Indicator, Temperature Regulator, Combustible Liquids

Atmospheric tanks used for storing combustible liquids (as defined in Section 5415) heated by internal heating coil/element shall be equipped with a liquid level indicator or equivalent device that displays the liquid level in the tank; or a temperature regulating system. When equipped with a temperature regulating system, the temperature regulating system shall automatically shut off the heat source to the tank before the tank contents reach the ignition temperature. If a liquid level indicator is the sole sensing method, 1) the liquid level indicator shall be affixed to the tank or located elsewhere, such as in a control room, 2) the liquid level indicator shall be monitored when filling or emptying the tank, 3) the location of the internal heating coil/element on the tank shall be clearly indicated.

1. New section filed 1-16-96; operative 2-15-96 (Register 96, No. 3).
2. Amendment of section heading and section filed 5-5-2014; operative 5-6-2014 pursuant to Government Code section 11343.4(b)(3) (Register 2014, No. 19).

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.