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Chapter 3
Steam System Fittings
| Question | Answer |
|---|---|
| Boiler fittings are necessary for ? a. appearance b. efficiency c. aesthetic purposes d. controlling air flow | b. efficiency |
| To prevent failure from pressure over MAWP, all steam boilers must be equipped with at least one ? a. safety valve b. blowdown valve c. gauge glass d. feedwater heater | a. safety valve |
| The purpose of a safety valve is to ? a. control the boiler operating range b. control high or low water c. prevent the boiler from exceeding its MAWP d. control high and low fire | c. prevent the boiler from exceeding its MAWP |
| Safety valves are designed to ? a. open slowly to prevent water hammer b. pop open c. open only by hand d. be opened by the pressure controller | b. pop open |
| When testing a safety valve manually, there must be ? a. at least 75% of the safety valve popping pressure on the boiler b. no boiler pressure c. an inspector present d. a pressure greater than the safety valve popping pressure on the boiler | a. at least 75% of the safety valve popping pressure on the boiler |
| Any repairs to the safety valve must be done by the ? a. chief engineer b. state inspector c. manufacturer authorized representative d. maintenance department | c. manufacturer authorized representative |
| An ? test is used to test the relief capacity of a safety valve a. accumulation b. try lever c. blowdown d. bench | a. accumulation |
| ? pressure is the pressure caused by the weight of a column of water a. pump b. hydrostatic c. steam d. suction | b. hydrostatic |
| A cyclone separator is a cylindrical device that separates water droplets from steam using ? a. pressurized steam b. pressurized air c. centrifugal force d. automatic nonreturn valves | c. centrifugal force |
| A steam pressure gauge must be protected by a siphon to prevent ? a. steam from entering the mud drum b. boiler pressure from damaging the gauge c. air from entering the bourdon tube d. steam from damaging the gauge | d. steam from damaging the gauge |
| The correction factor for hydrostatic pressure is ? psi per vertical foot a. 0.433 b. 8.3 c. 14.7 d. 34.5 | a. 0.433 |
| The boiler vent is open when warming up the boiler until ? a. the boiler is cut on line b. there is 10 to 15 psi of steam pressure on the boiler c. the superheater drain is closed d. the boiler begins to overheat | b. there is 10 to 15 psi of steam pressure on the boiler |
| Separators work on the basic principle of ? a. potential energy b. pressure drop separation c. trapping steam and letting water through d. changing the direction of the steam flow | d. changing the direction of the steam flow |
| The dry pipe separator is located in the ? a. upper part of the steam drum b. superheater outlet header c. main steam line d. line before the turbine throttle | a. upper part of the steam drum |
| ASME code states that high pressure boilers in battery which is two or more boilers connected to a common header and equipped with manhole openings must have ? a. one main steam stop valve b. two main steam stop valves c. no valve between the boiler | b. two main steam stop valves |
| A main steam stop valve should have a ? valve a. os&y gate b. os &y globe c. quick closing lever d. plug | a. os&y gate |
| A main steam stop valve should be a gate valve because a gate valve ? a. can be open in 1/4 turn b. can be used as a throttling valve c. offers no resistance to the flow of steam d. does not have to be fully open | c. offers no resistance to the flow of steam |
| During boiler inspection, the main steam stop valves are ? a. lefty fully open b. closed, locked, and tagged c. left partially open d. none of the above | b. closed, locked, and tagged |
| When warming up a boiler, the ? is in the open position until the boiler gauge registers about 10 to 15 psi a. equalizing line b. superheater drain c. boiler vent d. free blowing drain | c. boiler vent |
| During normal usage, ? are used to allow for the expansion and contraction of the main steam line a. flanged fittings b. welded braces c. expansion bends d. rigid pipe hangers | c. expansion bends |
| Boiler safety valves are placed at the highest part of the ? a. water drum b. boiler vent c. steam siphon d. steam space | d. steam space |
| A safety valve must be capable of discharging all the steam without the pressure increasing more than ? % above the MAWP a. 1 b. 6 c. 14.7 d. 25 | b. 6 |
| A safety valve opens when the ? exerted by the steam exceeds that of the spring a. total force b. temperature c. area gain d. huddling chamber force | a. total force |
| ? fittings are used for water columns operating above 350 psi a. cast iron b. malleable iron c. steel d. brass | c. steel |
| The ? is the part on a safety valve that increases the are of the safety valve disc a. bonnet b. huddling chamber c. body d. popping valve | b. huddling chamber |
Created by:
zmos89