subject:MECHANICAL AND ELECTRICAL SYSTEMS

QUESTION 3 a) Water pressure is a crucial measure of water supply system in a building. Pressure loss due to elevation and friction from pipes and fittings affect the overall water pressure in the building. i. Determine the equivalent length based on Table 13.2 provided in the Appendix 2 for five 90 elbows, two 45 elbows, six straight-run tees (all cast) and two gate valves, for 1 inch diameter copper pipe. (5 marks ii. Determine the pressure drop from friction across a plumbing line containing 50ft of linch diameter Type L copper pipe with fittings and valves mentioned above based on Friction Loss Chart provided in the Appendix 1. Assume the system is carrying water at a volumetric rate of 30gpm (gallon per minute) [4 marks) iii. Determine the residual pressure at the fixture outlet for the water supply system above when the pressure available at the water service is 50 psi (pound per square inch). The plumbing fixture outlet is 16ft above the ground. [4 marks APPENDIX 2: EQUIVALENT LENGTH OF TUBING FOR FRICTION LOSS IN VALVES AND FITTINGS 1% in 3 in 4.0 1.0 3.0 TABLE 13.2A EQUIVALENT LENGTH IN FEET OF TUBING FOR FRICTION LOSS IN VALVES AND FITTINGS (TUBING). Equivalent Feet of Pipe for Various Nominal Diameters Fitting or Valve % in % in 1 in 1% in 2 in 2% in 45" elbow (wrought) 0.5 0.5 1.0 1.0 2.0 2.0 3.0 90% elbow (wrought) 1.0 2.0 2.0 2.0 2.0 Tee, straight run (wrought) 0.5 0.5 0.5 1.0 1.0 2.0 Tee, branch (wrought) 1,0 2.0 3,0 4,0 9,0 45" elbow (cast) 0.5 2.0 2.0 3.0 5,0 904 elbow (cast) 1.0 2.0 4.0 5.0 11.0 14.0 Tee, straight run (cast) 0,5 0,5 1,0 2,0 2,0 Tee, branch (cast) 2.0 3.0 5.0 7.0 9.0 12.0 16.0 Compression stop 13,0 21,0 30,0 Globe valve 53,0 66,0 90,0 Gate valve 1.0 1.0 2.0 2.0 2.0 0.5 0.5 5,0 7,0 1.0 8.0 8.0 0,5 1,0 11.0 18.0 2,0 20,0 2.0 QUESTION 3 a) Water pressure is a crucial measure of water supply system in a building. Pressure loss due to elevation and friction from pipes and fittings affect the overall water pressure in the building. i. Determine the equivalent length based on Table 13.2 provided in the Appendix 2 for five 90 elbows, two 45 elbows, six straight-run tees (all cast) and two gate valves, for 1 inch diameter copper pipe. (5 marks ii. Determine the pressure drop from friction across a plumbing line containing 50ft of linch diameter Type L copper pipe with fittings and valves mentioned above based on Friction Loss Chart provided in the Appendix 1. Assume the system is carrying water at a volumetric rate of 30gpm (gallon per minute) [4 marks) iii. Determine the residual pressure at the fixture outlet for the water supply system above when the pressure available at the water service is 50 psi (pound per square inch). The plumbing fixture outlet is 16ft above the ground. [4 marks APPENDIX 2: EQUIVALENT LENGTH OF TUBING FOR FRICTION LOSS IN VALVES AND FITTINGS 1% in 3 in 4.0 1.0 3.0 TABLE 13.2A EQUIVALENT LENGTH IN FEET OF TUBING FOR FRICTION LOSS IN VALVES AND FITTINGS (TUBING). Equivalent Feet of Pipe for Various Nominal Diameters Fitting or Valve % in % in 1 in 1% in 2 in 2% in 45" elbow (wrought) 0.5 0.5 1.0 1.0 2.0 2.0 3.0 90% elbow (wrought) 1.0 2.0 2.0 2.0 2.0 Tee, straight run (wrought) 0.5 0.5 0.5 1.0 1.0 2.0 Tee, branch (wrought) 1,0 2.0 3,0 4,0 9,0 45" elbow (cast) 0.5 2.0 2.0 3.0 5,0 904 elbow (cast) 1.0 2.0 4.0 5.0 11.0 14.0 Tee, straight run (cast) 0,5 0,5 1,0 2,0 2,0 Tee, branch (cast) 2.0 3.0 5.0 7.0 9.0 12.0 16.0 Compression stop 13,0 21,0 30,0 Globe valve 53,0 66,0 90,0 Gate valve 1.0 1.0 2.0 2.0 2.0 0.5 0.5 5,0 7,0 1.0 8.0 8.0 0,5 1,0 11.0 18.0 2,0 20,0 2.0