Pipefitting Test #3 J.V. Questions and Answers (Graded A)

NPT - ANSWER-National Pipe Thread NPS - ANSWER-Nominal Pipe Size NC - ANSWER-National Course T.O. - ANSWER-Take-off XLR and correct take off for a 90 degree fitting - ANSWER-2 x NPS LR and correct take off for a 90 degree fitting - ANSWER-1 1/2 x NPS SR and correct take off for 90 degree fitting - ANSWER-1 x NPS Formula for finding the T.O. of a 45 degree BW elbow. - ANSWER-.625 x NPS Refrigeration copper comes in a roll. It has to be ______ before bending. - ANSWER-Anealed Three-(3) steps in bending copper or stainless tubing. - ANSWER-a. drawing b. template c. bend left to right For high pressure or high temperature, it is best to use _______ tubing. - ANSWER-Stainless The "R" on the bending tool means ______. - ANSWER-Reverse The number one concern on any project is _______. - ANSWER-Safety All pipe & tubing are measured _______ to _______. - ANSWER-Center to Center When tying on a piece of pipe to be pulled up by a hand line a ____ hitch & ____ hitch are required for security reasons. - ANSWER-Clove and Half Who is responsible for safety conditions in your work area? - ANSWER-Myself Formula for cut back measurement for miters? - ANSWER-OD x Tan of the Degree Give the three-(3) basics to knot tying - ANSWER-a. easy to tie b. easy to loosen c. hold/secure Give the formula to find the wrench sizes. - ANSWER-1 1/2 x bolt size = wrench size, in all cases HD nut + 1/8" 5/8 Bolt - ANSWER-5/16" head, 1 3/16" nut 1 1/4" Bolt - ANSWER-1 3/4" head, 1 7/8 nut 2" Bolt - ANSWER-3" head, 3 1/8" nut T or F, The OD is consistent & the I.D. varies in steel pipe. - ANSWER-True Formula for finding change of elavation of an eccentric reducer. - ANSWER-half OD - half OD Formula for finding circumference of pipe - ANSWER-Circumference equals Pi times Diameter Formula for dividing any fraction by one half. - ANSWER-Numerator x 1, Denominator x 2 Constant for finding hypotenuse for a 45 degree triangle. - ANSWER-Adj x 1.414 Constant for finding set on run when given the hypotenuse of a 45 degree triangle. - ANSWER-Hypotenuse x .707 O.D. for 2" NPS - ANSWER-2 3/8" OD O.D. for 3" NPS - ANSWER-3 1/2" OD O.D. for 4" NPS - ANSWER-4 1/2" OD O.D. for 6" NPS - ANSWER-6 5/8" OD O.D. for 8" NPS - ANSWER-8 5/8" OD O.D. for 10" NPS - ANSWER-10 3/4" OD O.D. for 12" NPS - ANSWER-12 3/4" OD OD for 14" NPS - ANSWER-14" OD