G2 Gas Technician Module 10 Questions and Answers Already Passed

G2 Gas Technician Module 10 Questions and Answers Already Passed The working pressure differential between the gas meter outlet and the appliance regulator inlet at furthest appliance from meter Define pressure drop 0.5" w.c. What is the Max pressure drop >7" w.c. NG 1" w.c. What is the Max pressure drop 7" - 14" w.c. NG After piping system is installed and before any appliance is connected to it. When do you do a high pressure test? 1. Isolate the piping system 2. Cap or plug open ends 3. Insert a pressure gauge at one end of the system 4. Pressurize system with air or inert gas to specified test pressure. How do you do a High pressure test 1. High pressure test prior to connecting appliance. Disconnect piping at gas meter and before appliance valve train. 2. Leak test with meter and appliance connected under normal operating pressure. Use a manometer or lowest volume test dial on meter. 10 min duration 3. Leak test using a liquid solution under normal operating pressure. Check all fittings. 4. Can also check system with manometer in an existing system which measure in. of W.C. this is for systems up to 14" W.C. Three tests required by code when installing 1. 3" in diameter 2. Max range shall exceed test pressure by at least 15% but less then 300% 3. Pressure gauge shall read in increments of 2psig or 2% of maximum dial reading of pressure gauge. Whichever is less. High pressure test gauges must be: Annex H Purging practices are located in which Annex? The break point pointing on the same side as the appliance Manual shut off valves shall be installed with? Outdoor use only. What location can you install a #3.16 manual shut off valve? 1. Type of fuel 2. Supply pressure 3. Type of material 4. Pressure drop 5. Length of piping 6. Total btu input for each appliance What must you know to size a piping system. Steel copper, plastic clause 6.1.1,What material should a piping and tubing system be made of? True - provided they are cleaned inspected, tested and the equivalent of new material. Clause 6.1.2,Piping, tubing and fittings can be reused true or false Malleable steel and iron. Clause 6.2.2 What type material(s) is a fitting required to be when used with steel pipe? ASTM A53. Clause 6.2.1 Piping shall comply with what standard? Schedule 40. Clause 6.2.3 Gas piping with operating pressure up to and including 125 PSIG shall be at least schedule? Type G L, K. Clause 6.2.4,What type of Copper tubing is used for gas system? Type L or G externally coated with extruded polyethylene or type K. Clause 6.2.7,Copper tubing underground shall be either type: 350 psi. Clause 6.2.9 Every hose and fitting shall have a minimum working pressure of? Outdoor and underground services. Clause 6.2.16 Plastic piping or tubing shall only be used for 1/2". Clause 6.3.9 Piping less then Nps _____ shall not be used in a concealed location. A stairwell within a dwelling unit. Clause 6.7.2(a) Piping and tubing shall not be installed in a stairwell other than Threaded flanged, press connected, welded. Clause 6.9.1,Joints in steel piping must be: 2 1/2". Clause 6.9.2 Piping of NPS _____ and over shall have welded pipe joints It is certified to CAN/ULC-S652. Clause 6.9.6 A joint sealant can be used if? Natural rubber. Clause 6.9.7 Gasket material cannot be made of what material? A flare joint an approved fitting and a press connect. Clause 6.9.9,A joint in seamless copper, brass or steel tubing shall be made by? No they cannot. Clause 6.14.2 Can bushings be nested? NPS 2 1/2 or greater. What size piping requires welded pipe joints? Brazing approved mechanical compression, press connect, approved flare. Clause 6.15.3,How is underground tubing joined Welding press connect, mechanical compression. Clause 6.15.2,How is underground piping joined Tracer wire. Clause 6.15.14 When buried what will accompany plastic piping and tubing 20 ft or less. Clause 6.17.1 How far must banding be spaced for labeling an institutional buildings gas line Plug ball or eccentric type. Clause 6.18.1,A manual shut off valve shall be of the No. Clause 6.20.1 Can you connect a hose to a vented appliance? No. Clause 6.20.3 Can you extend a hose from one room to anot her? To allow expansion contraction and vibration,Why do you use a corrugated metal connector in a commercial, industrial or process application