Chapter 7 (7.4.1 - 7.15.2) Wrong Answers Study Flashcards
(7.4.1) Pressure Reduction. Regulator venting and downstream overpressure protection shall comply with 5.8.55.8.6 and section 5.9. The regulator shall be accessible for service and repair and vented in accordance with one of the following.
(1) Where the fuel gas is lighter than air, regulators equipped with a vent limiting means shall be permitted to be ___(A)___. Regulators not equipped with a vent limiting means shall be permitted to be vented either directly to the outdoors or to a point ___(B)___.
(2) Where the fuel gas is heavier than air, the regulator vent shall be ___(C)___.
(A) vented into the chase
(B) within the top 1 foot of the chase
(C) vented only directly to the outdoors.
(7.4.3) Ventilation. A chase shall be ___(A)___. The opening(s) shall have a maximum free area (in square inches) equal to the product of one-half of the maximum pressure in the piping (in pounds per square inch) times the largest nominal diameter of that piping (in inches), or the cross-sectional area of the chase, whichever is smaller. Where more than one fuel gas piping system is present, ___(B)___ and the largest area used.
(A) Ventilated to the outdoors and only at the top.
(B) the free area of both systems shall be calculated
(7.6.1) Provide drips where Necessary. For other than dry gas conditions, a drip shall be provided at any point in the line of pipe where condensate could collect. Where required by the authority having jurisdiction or the serving gas supplier, a drip shall also be provided at the outlet of the meter. The drip shall be installed so as to _______ before it runs back into the meter.
constitute a trap wherein an accumulation of condensate shuts off the flow of gas.
(7.7.2.1) Each outlet, including a valve, shall be closed gastight with a ___(A)___>
When an appliance or equipment is disconnected from an outlet and the outlet is not to be used again immediately, it shall be capped or plugged gastight.
Exception 1: ___(B)___ installed in accordance with 9.6.2(1) shall be permitted.
Exception 2: The use of a ___(C)___ with integral shutoff or listed gas convenience outlet shall be permitted.
(A)Threaded cap or plug immediately after installation and shall be left closed until the equipment or appliance is connected thereto.
(B) Laboratory appliances
(C) listed quick disconnect valve
(7.9.2.1) Accessibility of Gas Valves. Main gas shutoff valves controlling several gas piping systems shall be ___(A)___ for operation and installed so as to be ___(B)___. They shall be marked ___(C)___ or other permanent means attached by the installing agency so that the gas piping systems supplied through them can be readily identified.
(A) readily accessible
(B) protected from physical damage
(C) with a metal tag
(7.9.2.3) Emergency Shutoff Valves. An exterior shutoff valve to permit turning off the gas supply ______ as such and their locations posted as required by the authority having jurisdiction.
to each building shall be provided. The emergency shutoff valves shall be plainly marked
(7.12.6) Use of Automatic Firechecks, Safety Blowouts, or Backfire preventers. Automatic firechecks, safety blowouts, or backfire preventers shall be provided in piping systems distributing flammable air-gas mixtures from gas-mixing machines to ______.
to protect the piping and machines in the event of flashback.
(7.13.1) Pipe and tubing other than CSST. Each aboveground portion of a gas piping system, other than CSST, that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping, other than CSST, shall be considered to be ______.
bonded when it is connected to an appliance that are connected to the appliance grounding conductor of the circuit supplying that appliance.
(7.13.3) Prohibited Use. Gas piping shall not be used as _____.
a grounding conductor or electrode.
