Mohammd Fani Kheshty - Department of chemical industry, University of Applied Science and Technology, partlastic, Mashhad,Iran
Navid Ramezanian - Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
Ladan Bichranlo - Department of chemical industry, University of Applied Science and Technology, partlastic, Mashhad,Iran
Sajad Baradaran - Department of chemical industry, University of Applied Science and Technology, partlastic, Mashhad,Iran

Pressure drop is defined as the difference in total pressure between two points of a fluid carrying network. Pressure drop occurs by the resistance to flow on the path offluid flow, act on a fluid as it flows through the tube. The main determinants of resistance to fluid flow are fluid velocity through the pipe and fluid viscosity. Pressure drop increases proportional to the frictional shear forces within the piping network [1,2]. Many factors cause a loss of pressure in the flow path of the fluid, Change height in fluid flow path, friction lost, valve, Changed in the cross-section of fluid, fluid flow measurement equipment such as: orifice plate and venturi meter. All of these parameters cause a pressure drop in the flow network and in different fluid flow; the effect of each factors has been measured and compared with each other. In fig 1. the laboratory apparatus used for measurements is observed. A digital manometer is used to measure the pressure drop between two points of pipelines. The required pressure is supplied by a centrifuge pump with a power of 0.37 Kw. Fluid flow measured depending on the amount of fluid passed from pipeline over time. It should be noted, however, that for experimental testing, two devices with different tube diameters and pipe lengths and different orifice and venture meter diameter have been used to the effect of the different diameter and length of the pipeline is also observed in the results. These two devices complement each other and they can be used to measure different parameters of the system pressure drop and compared with each other.