Gas Vocab

Question 1

Stress

Answer 1

The resultant internal force that resist change in the size or shape of a body acted on by an external forces in this code the term stress is often used as being synonymous with unit stress which is the stress per unit area

Question 2

Hoop stress

Answer 2

The stress in a pipe wall, acting circumferentially In a plane perpendicular to the longitudinal axis of the pipe and produced by the pressure of the fluid in the pipe

Question 3

Central premix system

Answer 3

A system that distributes flammable gas-air mixtures to two or more remote stations

Question 4

Hybrid pressure system

Answer 4

A piping system in which the pressure at the point of delivery is reduced by one or more line pressure regulators prior to the appliance connection

Question 5

Piping system

Answer 5

All piping ,valves, and fittings from the outlet of the point of delivery from supplier to the outlets of the equipment shut off valves

Question 6

Tensile strength

Answer 6

The highest unit tensile strength and material can sustain before failure

Question 7

Thread join compounds

Answer 7

Non-hardening Materials used on pipe threads to ensure a Seal

Question 8

Tubing

Answer 8

Semi ridgid conduit of copper ,steel, aluminum, corrugated stainless steel tubing, or plastic.

Question 9

Valve

Answer 9

A device used in piping to control the gas supply to any section of a system of piping or to a appliance.

Question 10

Appliance shut off valve

Answer 10

A valve located in the piping system used to shut up individual equipment.

Question 11

Automatic valve

Answer 11

A automatic or semi automatic device consisting essentially of a valve and operator that control the gas supply to the burners during operation of an appliance.

Question 12

Excess flow valve

Answer 12

A Valve designed to activate when the fuel gas passing through exceeds a prescribed flow rate

Question 13

Manual reset valve

Answer 13

Automatic shut off valve installed in the gas supply piping and Set to shut off when unsafe conditions occur. The device remains closed until manually re-opened

Question 14

Pressure relief valve

Answer 14

A valve that automatically opens and closes a relief vent, depending on whether the pressure is above or below a Predetermined value.

Question 15

Temperature Relief valve

Answer 15

A valve that automatically opens and automatically closes a relief vent, depending on whether the temperature is above or below a predetermined value

Question 16

Vacuum relief valve

Answer 16

A Valve that automatically opens and closes a vent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value.

Question 17

Service shut off valve

Answer 17

A Valve, installed by the serving gas supplier between the service meter or source of supply and the customer piping system, to shut off the entire piping system.

Question 18

Valve Member

Answer 18

That part of a gas valve rotating within or in respect to the valve body that, by its position with respect to the valve body, controls the flow of gas.

Question 19

Nondisplaceable Valve member

Answer 19

A valve member That cannot be moved from its seat by force applied to the handle or to any exterior portion of the valve.

Question 20

Vent

Answer 20

A passage way used to convey fluegases from appliances or their vent connectors to the outdoors.

Question 21

Regulator vent

Answer 21

The opening in the atmospheric side of the regulator houseing permittingThe in and out movement of air to compensate for the movement of the regulator diaphragm.

Question 22

Wall had adapter

Answer 22

A transition fitting for terminating plastic pipe inside of buildings at the building wall.

Question 23

Zero governor

Answer 23

A regulating device that is normally adjusted to deliver gas the atmospheric pressure within its flow rating.