Preface This publication represents a standard for requirements for priority and sequencing equipment, which is part of a hydrogen gas vehicle fueling system. Scope 1.1.1 These requirements apply to priority and sequencing equipment (see Part IV - Definitions) which is part of a hydrogen gas vehicle fueling system, hereinafter referred to as equipment. 1.1.2 Priority and sequencing equipment of a type not specifically addressed in these requirements may be subjected to such examinations and tests as deemed necessary by the testing agency to determine compliance with the intent of these requirements. 1.1.3 If a value for measurement, as given in these requirements, is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.