46 CFR § 30.10-22 - Flammable liquid—TB/ALL.

---
identifier: "/us/cfr/t46/s30.10-22"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 30.10-22 - Flammable liquid—TB/ALL."
title_number: 46
title_name: "Shipping"
section_number: "30.10-22"
section_name: "Flammable liquid—TB/ALL."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "D"
subchapter_name: "TANK VESSELS"
part_number: "30"
part_name: "GENERAL PROVISIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2103, 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 65-50, 30 FR 16657, Dec. 30, 1965, unless otherwise noted."
cfr_part: "30"
---


# 30.10-22 Flammable liquid—TB/ALL.

The term *flammable liquid* means any liquid which gives off flammable vapors (as determined by flashpoint from an open-cup tester, as used for test of burning oils) at or below a temperature of 80 °F. Flammable liquids are referred to by grades as follows:

(a) *Grade A.* Any flammable liquid having a Reid 
<sup>1</sup>
[^] vapor pressure of 14 pounds or more.

<sup>1</sup> American Society for Testing Materials Standard D 323 (incorporated by reference, see § 30.01-3), Method of Test for Vapor Pressure of Petroleum Products (Reid Method).

(b) *Grade B.* Any flammable liquid having a Reid 
<sup>1</sup> vapor pressure under 14 pounds and over 8
1/2 pounds.

(c) *Grade C.* Any flammable liquid having a Reid 
<sup>1</sup> vapor pressure of 8
1/2 pounds or less and a flashpoint of 80 °F. or below.

[CGFR 65-50, 30 FR 16657, Dec. 30, 1965, as amended by CGD 73-96, 42 FR 49023, Sept. 26, 1977; USCG-2000-7790, 65 FR 58458, Sept. 29, 2000]