Pipe diameter Equivalent

As a length of pipe that would cause the same pressure loss as the fitting or valve. As this will be a function of the pipe diameter, it is expressed as the number of equivalent pipe diameters. The length of pipe to add to the actual pipe length is found by multiplying the total number of equivalent pipe diameters by the diameter of the pipe being used. 

The number of velocity heads lost, or equivalent pipe diameter, is a characteristic of the particular fitting or type of valve used. Values can be found in handbooks and manufacturers literature. The values for a selected number of fittings and valves are given in Table 5.3. 

Fitting or valve K, number of velocity heads number of equivalent pipe diameters... 

A tanker carrying toluene is unloaded, using the ship s pumps, to an on-shore storage tank. The pipeline is 225 mm internal diameter and 900 m long. Miscellaneous losses due to fittings, valves, etc., amount to 600 equivalent pipe diameters. The maximum liquid level in the storage tank is 30 m above the lowest level in the ship s tanks. The ship s... 

Miscellaneous friction losses due to the tanker outlet constriction and the pipe fittings in the inlet piping, are equivalent to 1000 equivalent pipe diameters. The vapour pressure of chlorine at the maximum temperature reached at the pump is 685 kN/m2 and its density and viscosity, 1286 kg/m3 and 0.364 mNm 2s. The pressure in the tanker is 7 bara. 

Take as equivalent pipe diameters. All bends will be taken as 90° standard radius elbow. Line to pump suction ... 

Fitting Number of equivalent pipe diameters LJdt Number of velocity heads K... 

Fitting or Valve K, Number of Velocity Heads Number of Equivalent Pipe Diameters... 

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