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(b) The reliability of a metal sheet cutter is given by the expression 1-(t/6)3/2, 0stS6 R(t) = t > 6 where t is calendar time measured in years. Annual preventive maintenance restores the system to "as good as new" condition. Compare the mean time to failure of the cutter with and without preventive maintenance. 3) (c) A fleet of helicopters operate in the North Sea all year round. One helicopter system is normally on standby, with failure rate on standby of lo = 35 per million hours of calendar time. The system availability should be 0.99. Assuming that the active repair time of the system is negligible, how frequently should the helicopter be inspected? (d) A hydraulically operated gate valve is made up of the seven components, listed in the following table, along with the unavailability of each component. Estimate the availability of the valve, stating any assumptions made. Gate valve components Сар Piston Unavailability 0.0005 0.0002 Actuator body 0.0005 Stem 0.0016 Spring Seal 0.0020 0.0080 Gate 0.0060

(b) The reliability of a metal sheet cutter is given by the expression 1-(t/6)3/2, 0stS6 R(t) = t > 6 where t is calendar time measured in years. Annual preventive maintenance restores the system to "as good as new" condition. Compare the mean time to failure of the cutter with and without preventive maintenance. 3) (c) A fleet of helicopters operate in the North Sea all year round. One helicopter system is normally on standby, with failure rate on standby of lo = 35 per million hours of calendar time. The system availability should be 0.99. Assuming that the active repair time of the system is negligible, how frequently should the helicopter be inspected? (d) A hydraulically operated gate valve is made up of the seven components, listed in the following table, along with the unavailability of each component. Estimate the availability of the valve, stating any assumptions made. Gate valve components Сар Piston Unavailability 0.0005 0.0002 Actuator body 0.0005 Stem 0.0016 Spring Seal 0.0020 0.0080 Gate 0.0060

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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(b) The reliability of a metal sheet cutter is given by the expression 1-(t/6)3/2, 0stS6 R(t) = t > 6 where t is calendar time measured in years. Annual preventive maintenance restores the system to "as good as new" condition. Compare the mean time to failure of the cutter with and without preventive maintenance. 3) (c) A fleet of helicopters operate in the North Sea all year round. One helicopter system is normally on standby, with failure rate on standby of lo = 35 per million hours of calendar time. The system availability should be 0.99. Assuming that the active repair time of the system is negligible, how frequently should the helicopter be inspected? (d) A hydraulically operated gate valve is made up of the seven components, listed in the following table, along with the unavailability of each component. Estimate the availability of the valve, stating any assumptions made. Gate valve components Сар Piston Unavailability 0.0005 0.0002 Actuator body 0.0005 Stem 0.0016 Spring Seal 0.0020 0.0080 Gate 0.0060
Transcribed Image Text:(b) The reliability of a metal sheet cutter is given by the expression 1-(t/6)3/2, 0stS6 R(t) = t > 6 where t is calendar time measured in years. Annual preventive maintenance restores the system to "as good as new" condition. Compare the mean time to failure of the cutter with and without preventive maintenance. 3) (c) A fleet of helicopters operate in the North Sea all year round. One helicopter system is normally on standby, with failure rate on standby of lo = 35 per million hours of calendar time. The system availability should be 0.99. Assuming that the active repair time of the system is negligible, how frequently should the helicopter be inspected? (d) A hydraulically operated gate valve is made up of the seven components, listed in the following table, along with the unavailability of each component. Estimate the availability of the valve, stating any assumptions made. Gate valve components Сар Piston Unavailability 0.0005 0.0002 Actuator body 0.0005 Stem 0.0016 Spring Seal 0.0020 0.0080 Gate 0.0060
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