Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

Hexagon® Agility® Glossary of Acronyms and Terms

PDO.0071 Ver 1.0 January 10, 2023
Abbreviation

Term

—

1/4-turn manual
shutoff valve

hand operated fuel system valve typically located in the
FMM which controls the flow of gas from one part of the
system to another. AKA: emergency shutoff valve.

A

ampere or amp

base unit of electric current in the International System
of Units (SI). "A" represents amperage in equations

—

abrasion damage

—

absolute pressure

—

absolute zero

—

Agility®

AC

all carbon

fuel system cylinder composed primarily of carbon fiber.
See: "TuffShell® ACF"

—

all-composite

fuel cylinder made primarily from non-metallic materials
such as plastic and high strength fiber reinforced
composites. May incorporate metal ports for valves and
other plumbing devices.

—

ambient temperature

AGA
AHJ

American Gas
Association
authority having
jurisdiction

Definition

damage to composite cylinder caused by wearing,
grinding, or rubbing away of composite material by
friction
gauge pressure plus barometric pressure. Often
expressed as "psia" in imperial and U.S. customary units
of measure
the zero point on the absolute temperature scale which
is equal to -273.16° C, or 0°K (Kelvin), or -459.69°F.
registered mark of Agility® group of companies

temperature of air surrounding the fuel system
trade group representing natural gas distributors and
pipelines
an organization, office, or individual responsible for
enforcing regulations and laws

ANSI

American National
Standards Institute

private, not-for-profit organization dedicated to
supporting U.S. voluntary standards and conformity
assessment system and strengthening its impact, both
domestically and internationally.

ASDS

Automatic Solenoid
Detection System

standalone Hexagon® Agility® fuel system option to
monitor electric solenoid cylinder valve operation

ASL

automated side load

refuse vehicle equipped with a side mounted articulating
arm to handle trash and recycling receptacles

ASM

assembly

system, subsystem, or component which is supplied by
Hexagon® Agility® fully assembled from multiple parts

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

approved company or fleet contracted with Hexagon®
Agility® to engage in fuel system maintenance and
repair and/or parts sales

ASP

authorized service
provider

—

atmosphere

AUX

auxiliary

B (+) / B+

battery positive

B (-) / B-

battery negative

—

bar

International System unit of pressure. 1 bar = 0.1 MPa

—

barometer

instrument used for measuring atmospheric pressure

—

bio-gas

methane produced by the decomposition or processing
of organic matter

—

biomass

biologically produced organic matter

outdoor air in general
secondary or supplementary; commonly used to refer to
an optional fuel fill receptacle location
battery terminal or connected wire carrying positive
electron flow
battery terminal or connected wire carrying negative
electron flow

connection point for multiple electrical feeds; may also
act as a switching unit for the vehicle battery to connect
or disconnect electrical components

BJB

battery junction box

—

blank plug

a threaded plug with O-ring seal

—

bleed valve

located in the FMM, the bleed valve allows for the safe
release of residual fuel system pressure for
depressurization and defueling procedures

—

Blue iQ™

Hexagon® Agility® proprietary control system to regulate
CNG fuel systems for Cummins® engines
Hexagon® Agility® Blue iQ™ display which
communicates information to the driver including fuel
level, engine power mode, and fault messages

—

Blue iQ™ gauge

BOC

back of cab

BOM

bill of materials

list of fuel system components in a given assembly or kit

—

boss

aluminum fittings at the ends of a cylinder which contain
ports for installation of valves, pressure relief devices
and blank plugs

BTC

behind the cab

BTU

British thermal unit

See: "BTC"

CNG or H2 fuel system mounted on the chassis frame
and installed behind the vehicle cab
Imperial and U.S. customary unit of heat; one BTU
equals 252 calories, (gram); 778 foot-pounds; 1,055
joules; or 0.293 watt hours.

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

—

burst pressure

pressure at which a component fails due to stresses
induced because of the pressure
International System temperature scale on which water
freezes at 0° and boils at 100° under standard
conditions

C

Celsius

—

Calterm™

CAN

controller area
network

robust vehicle bus standard designed to allow
microcontrollers and devices to communicate with each
other's applications without a host computer

CAN

National Standard of
Canada

standards developed by Canada's standards
development organizations (SDO) and submitted to the
Standards Council of Canada to determine if they meet
the criteria to become a National Standard of Canada
(NSC). AKA NSC

—

capacity

CARB

California Air
Resources Board

—

carbon fiber

—

cascade system

—

certification
(individual)

an authoritative attestation: specifically, the issuance of
a document that states that an individual has
demonstrated the knowledge and skills necessary to
function in a particular professional field

certification (product)

a system whereby a certification organization
determines that a manufacturer has demonstrated the
ability to produce a product that complies with the
requirements of this standard, authorizes the
manufacturer to use a label on listed products that
comply with the requirements of this standard, and
establishes a follow-up program conducted by the
certification organization as a check on the methods the
manufacturer uses to determine continued compliance
of labeled and listed products with the requirements of
this standard

CGA

Canadian Gas
Association

Cummins® engine diagnostic software

water volume of a container. Typically expressed in
liters and gallons
clean air agency in the government of California--the
only state permitted to issue emissions standards under
the federal Clean Air Act, subject to a waiver from the
United States Environmental Protection Agency
one type of reinforcement fiber used in fuel cylinder
composite overwrap
fuel storage in multiple pressure vessels, cylinders, or
containers, which can be at different pressures, such
that fueling is normally done initially from lower pressure
containers, and completed from higher pressure
containers

natural gas industry group based in Canada which
develops and publishes safety codes and standards

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

International association of companies dedicated to the
development and promotion of safe, secure, and
environmentally responsible manufacture,
transportation, storage, transfilling, and disposal of
industrial, medical, and food gases and their containers

CGA

Compressed Gas
Association

CGH2 or CGH2

compressed
hydrogen gas

See: "hydrogen compressed gas"

CH2 or CH2

compressed
hydrogen

See: "hydrogen compressed gas"

compression fitting

high pressure tube fitting which relies on swaged
components rather than traditional end flaring.
Compression fittings are tightened to specifications
using a prescribed number of turns or a with the aid of a
go-no-go gauge.

propane

a gas, the molecule of which is composed of three
carbon and eight hydrogen atoms. Propane is present in
most natural gas and is the first product refined from
crude petroleum. Contains approximately 2,500 BTU per
cubic foot.

CH4 or CH4

methane

the first of the paraffin series of hydrocarbons and the
chief constituent of natural gas. Pure methane has a
heating value of 1,012 BTU per cubic foot.

—

check valve

a valve built to pass a fluid or gas in one direction but to
close automatically when the fluid or gas tries to flow in
the opposite direction

cm

centimeters

International System unit of distance. 1 cm = 0.001 m

composite

a solid material composed of two or more substances
having different physical characteristics and in which
each substance retains its identity while contributing
desirable properties to the whole; especially a structural
material made of plastic within which a fibrous material
is embedded

CNG

compressed natural
gas

fuel product made by compressing natural gas, which is
mainly composed of methane (CH4), to less than 1% of
the volume it occupies at standard atmospheric
pressure

—

condemned cylinder

a fuel container that has been damaged beyond repair
and must be removed from service and rendered
unusable. See: "destroyed"

—

conditioning circuit

—

Connected
Diagnostics™

—

corrosion

—

C3H8 or C3H8

—

electrical circuit used to stabilize a sensor signal input output
Cummins® wireless telemetry-based engine monitoring
and diagnostics
deterioration of a metal by chemical or electrochemical
reaction with its environment

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

CSA

Canadian Standards
Association

CSA Group is a not-for-profit organization which
develops and promotes standards research,
development, and education. CSA Group commercial
subsidiaries provide expert testing, inspection, and
certification services to enable manufacturers to
demonstrate that their products are in compliance with
applicable safety, environmental, and operating
performance standards in Canada and globally.

cylinder

containment vessel used for pressurized storage of
gaseous fuels; Agility uses cylinders for CNG and H2.
Compare with: "tank"
safety feature preventing accidental engine cranking
during fueling and keeps drivers from leaving the fuel
dispenser with the fuel hose still attached. DAP
components include reed switches on receptacle covers
and FMM doors or magnetic caps which when
open/uninstalled interrupt the vehicle ignition circuit by
not the completing the ground.
located inside the FMM, the defuel valve allows fuel to
be removed from the system via the defuel receptacle

DAP

drive away protection

—

defuel valve

—

delamination

an induced separation between composite layers. This
type of damage occurs from localized impact or resin
burn out

—

derate

engine control program which limits engine/power unit
power when a low fuel or other non-optimal operating
parameter is detected. A derate is designed to prevent
damage to the fuel system, engine, or power unit

—

destroyed

DGE

diesel gallon
equivalent

DIA

diameter