Week 4 Review Assignment

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ECPI University *

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Course

230

Subject

Mechanical Engineering

Date

Dec 6, 2023

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docx

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4

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MET230: Hydraulics and Pneumatics Week 4 Review Assignment Problem 1 A pipe handles a flow rate of 35 gpm. Find the minimum inside diameter that will provide an average fluid velocity not the exceed 20 ft/s. Answer: 0.846in Problem 2 A steel tubing has a 1.5-in outside diameter and a 1.210-in inside diameter. It is made of AISI 1020 annealed steel having a tensile strength of 57,000 psi. What would be the safe working pressure for this tube assuming a factor of safety of 8? Answer: 1708psi Problem 3 Select the proper-sized steel tube for a flowrate of 25 gpm and an operating pressure of 1,000 psi. The maximum recommended velocity is 20 ft/s and the factor of safety 8. The tube is made out of SAE 1010 with a tensile strength of 55,000 psi. Answer: ¾ by 0.049in by 0.652in Figure 10-7. Common tube sizes Page 1
Problem 4 Oil at 24 gpm and 1200 psi enters the low-pressure inlet of a 4:1 Racine pressure intensifier. Find the discharge flow rate and pressure. Answer:6gpm / 4800psi Problem 5 Oil at 155 o F and 2250 psi is flowing through a pressure relief valve at 25 gpm. What is the downstream oil temperature? Answer: 172.87°F Note 1 hp = 42.4 Btu/min. Also, for oil under consideration, Specific heat = 0.42 Btu/lb/ o F 1 gpm = 7.42 lb/min Problem 6 A hydraulic pump operates at 150 bars and delivers oil at 0.0015 m 3 /s to a hydraulic actuator. Oil discharges through the pressure relieve valve (PRV) during 50% of cycle time. The pump has an overall efficiency of 87%, and 15% of power is lost due to frictional pressure losses in the hydraulic lines. What heat –exchanger rating is required to dissipate all the generated heat? Answer: 16.3kW Page 2
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