National Fuel Gas Code Test - Questions and Answers Where gas piping is to be concealed, _____, tubing fittings, right and left couplings, bushings,
... [Show More] swing joints and compression couplings shall not be used Unions Where copper tubing installed vertically and horizontally inside hollow walls without protection, a steel striker barrier not less than ________ or ________ " thick or equivalent shall be installed between tubing and finished wall. 1.3mm or .0508". In industrial occupancies, gas pipe in solid floors such as concrete shall be laid in _______ in the floor and covered to permit access to pipe with minimum damage to the building structure. Channels In other than industrial occupancies where approved by the AHJ, gas pipe embedded in concrete floor slabs made of portland cement shall be surrounded with a minimum of ____" of concrete, protected from corrosion, and not embedded in concrete made with quickset additives or cinder aggregate. 1 1/2" Gas piping with fuel gas lighter than air, exceeding 5 psi, and installed in vertical chases: shall be installed with a pressure regulator accessible for service or repair and equipped with a vent limiting device and shall be allowed to vent _______________ . directly into the chase Gas piping with fuel gas lighter than air, exceeding 5psi and installed in vertical chases, shall be installed with a pressure regulator accessible for service or repair and vented __________; ______________. directly to the outdoors ; or to a point within the top 1' of the chase. Where fuel gas is heavier than air, exceeding 5psi and installed in vertical chases, shall be installed with a pressure regulator accessible for service or repair and vented _________. only directly to the outdoors. Chases used for gas regulator venting, shall be ventilated to the outdoors and only at the top. The openings shall have a minimum free area in square inches equal to the product of ______ of the maximum pressure in the piping in psi times the largest nominal diameter of that piping in inches, or cross sectional of the chase, whichever is smaller. Where more than one fuel gas piping system is present, the free area for each system shall be calculated and the largest area used. one half Provide a ____where necessary for other than dry gas conditions. It shall be provided at any point in the line of pipe where condensate could collect. Drip Where required by the AHJ or the serving gas supplier, a drip shall be provided at the_____ of the meter. outlet. Location of drips shall be installed only in places that they will be readily accessible to permit ________ or __________. cleaning or emptying. A drip shall not be located where the condensate is likely to _______. freeze. Gas outlets shall not be located behind ______. Doors ______ shall be located far enough from floors, walls, patios, slabs, and ceilings to permit the use of wrenches without straining, bending, or damaging the piping. gas outlets The unthreaded portion of gas piping outlets shall extend not less than ___" through finished ceilings or indoor or outdoor walls. 1 The unthreaded portion of gas piping outlets shall not extend less than ___" above the surface of floors or outdoor patios or slabs. 2 Each outlet, including a valve, shall be closed gastight with a threaded ____ or ____ immediately after installation and shall be left closed until the appliance or equipment is connected. cap or plug Where two gas pressure regulators are installed in a series in a single gas line, a manual valve _________ be required at the second regulator. shall not When a branch outlet is placed on a main supply line before it is known what size pipe will be connected to it, the outlet shall be of ______ size as the outlet supplying it. the same [Show Less]