unit 10 Tssa Exam Questions And Answers!!

when a pipe and fittings are set up for welding, how wide is the root face? - 1/16 in. to 1/8 in. what size is the Copper tracer wire on underground piping? - minimum 16 gauge what situation requires a soap test - when a leak is indicated by a drop in pressure, every joint and fitting must be checked what should be done if welding is taking place in a confined area? - ensure adequate ventilation after welding is completed in an area where combustible material is present, how long should a "fire watch", be maintained? - at least 30 minutes what must be done to pipping or tubing passing through concrete - Clause 6.16.9 it must be sleeved it must be coated it must be double wrapped how often should oxygen and acetylene regulators be oiled - none of the above do the installation and service manuals supplied by the manufacturer always specify details of replacement parts? - details of replacement parts are not a mandatory Element of a service manual what are the final drawings on a job called? - the "as built'' drawings what is the adverse effect from a ultraviolet radiation produced by an arc welding? - it can cause eye damageit can cause skin burns by arc welding what ensures a piping and tubing system stays leak free - visually inspect pipe and fittings what is used to purge a pipe sized 4" in. or after it has been tested with air? - carbon dioxide or nitrogen or a mixture of both what is the best practice when installing a gas pipe riser through pavement? -Clause 6.15.10 install a sleeve to allow free movement and serve as a vent what indicates that a manual shut off-valve is approved for installation in a natural gas or propane system - it is marked CAN/CGA 3.16 it shall be of the eccentric type and shall not be subjected to greater temperature or pressure then its rating. it shall be of the ball type and shall not be subjected to greater temperature or pressure then its rating what method is used to identify aboveground gas piping? - -yellow paint -yellow banding -label marked ''gas'' or ''propane'' as applicable, utilizing yellow labels or markings how much of a manufacture's instruction and service manual should be read - the entire manual the B149.1 gas code dose not require the identification of gas piping in what location - always requires identification how can the contents of a sealed pipe be identified - trace the pipe back to its source how many changes per hour are required in a welding shop - 4 changes per hourwhat is the normal purge velocity for large pipes - 200 ft./min