Essay --

CHAPTER NO 5 Adjustments & maintenance 5.1 Capillary Tube 5.2 Priming 5.3 Pressure Gauge Fitting 5.4 Relief Valve 5.5 Pressure Adjustment 5.6 PD Pump System Flow Diagram 5.7 External Relief Valve Adjustment 5.8 Internal Relief Valve Adjustment 5.9 Motor Lubrication 5.1 Capillary Tube:- A capillary tube is a narrow, long tube of constant diameter. In refrigeration application of capillary tube, the surface tension is not important. Tube length limit from 1.0 m to 6 m and the diameters of refrigerant capillary tubes limit from 0.5 mm to 3 mm. Due to the following two factors the pressure reduction in a capillary tube occurs: The frictional resistance offered by tube walls refrigerant has to overcome. Than that of the liquid the density of vapor is less. As it flows in the tube the average density of refrigerant decreases. The increase in acceleration or velocity of the refrigerant requires pressure drop. 5.2 Priming:- Liquid pumps can lose prime and to get the pump started this will require the pump to be primed by adding liquid to the pump and inlet pipes. Loss of "prime" ...