【Boiler Weekly Question from November 23-29】Multiple-choice Questions
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For boilers with a rated steam pressure greater than 3.82 MPa, the diameter of the safety valve throat shall not be less than (). A, 10mm. B, 20mm. C, 30mm. D35mm。
For boilers with a rated steam pressure greater than 3.82 MPa, the diameter of the safety valve throat shall not be less than (). B, 20mm
For boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than (B). A, 10mm. B, 20mm. C, 30mm. D35mm。
For boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than (B). A, 10mm. B, 20mm. C, 30mm. D35mm
For boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than (B). A, 10mm. B, 20mm. C, 30mm. D35mm
For boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than (B). A, 10mm. B, 20mm. C, 30mm. D35mm
B, 20mm. ------------------------------------
This post was last edited by chuanhengmpq on 2015-11-23 at 13:19. For boilers with a rated steam pressure greater than 3.82 MPa, the diameter of the safety valve throat should not be less than (B). The installation of safety valves shall meet the following requirements: (l) Boilers with a rated evaporation capacity greater than 0.5 t/h shall be equipped with at least two safety valves; boilers with a rated evaporation capacity equal to or less than 0.5 t/h shall be equipped with at least one safety valve. Safety valves must be installed at the outlet of the economizer and at the outlet of the steam superheater. (2) The safety valve should be installed vertically at the highest point of the boiler drum or header. No steam extraction outlet pipes or valves shall be installed between the safety valve and the boiler drum or header. (3) Lever-type safety valves shall be equipped with a device to prevent the weight from moving on its own and guide rails to restrict the lever from going out of track, while spring-type safety valves shall have a lifting handle and a device to prevent the adjustment screws from being turned arbitrarily. (4) For boilers with a rated steam pressure of 3.82 MPa or less, the throat diameter of the safety valve shall not be less than 25 mm; for boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than 20 mm. (5) The cross-sectional area of the connection pipe between the safety valve and the boiler shall be no smaller than the inlet cross-sectional area of the safety valve. If several safety valves are installed together on a short pipe directly connected to the boiler drum, the cross-sectional area of the passage of this short pipe shall be not less than 1.25 times the total venting area of all the safety valves. (6) Safety valves should generally be equipped with exhaust pipes, which should lead to a safe location and have sufficient cross-sectional area to ensure smooth exhaust. At the bottom of the safety valve exhaust pipe, a drain pipe leading to a safe location should be installed; no valves are allowed to be installed on either the exhaust pipe or the drain pipe.
For boilers with a rated steam pressure greater than 3.82 MPa, the throat diameter of the safety valve shall not be less than (B). A, 10mm. B, 20mm. C, 30mm. D35mm