A natural gas pipeline is being built for service in low temperature conditions. At the expected temperature, 8 OD inch nominal pipe of ASTM A334 Grade 8 alloy steel material is to be used. The material has Sy ~ LN [75.4, 3.0] ksi. It will be subjected to an internal pressure load of P ~ LN [2.5, 0.6] ksi. Assume you can use the thin-wall pressure vessel equation to calculate the hoop stress. a. What is the value of z that corresponds to a reliability of 0.999995 against yielding

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.