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Pipe Flushing Procedure Pdf Download

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MessagePosté le: Lun 31 Oct - 14:14 (2016)    Sujet du message: Pipe Flushing Procedure Pdf Download Répondre en citant

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Pipe Flushing Procedure Pdf Download

Skip to Navigation Skip to Content Hydraulics & Pneumatics Search: Subscribe Digital Issue Newsletters RSS Advertise Contact Us Register Log In Display name or email address: * Password: * Remember me Forgot Your Password? close TechnologiesAccumulators Air Compressors Air Preparation Controls & Instrumentation Cylinders & Actuators Fittings & Couplings Heat Exchangers Hose & Tubing Hydraulic Filters Hydraulic Fluids Hydraulic Pumps & Motors Hydraulic Valves Maintenance Manifolds & HICs Other Components Other Technologies Pneumatic Valves Reservoirs & Accessories Seals Vacuum Technology NewsProducts Events Image Galleries MarketsAerospace Agricultural Construction Entertainment Food & Beverage Forestry & Lumber Machine Tools Marine & Offshore Material Handling Mining Other Industries Packaging Plastics & Injection Molding Rail, Truck & Bus Waste Management Fluid Power BasicsAccessories Circuits Conductors Fluid Cleanliness Hydraulics Motors & Actuators Organizations Pneumatics Pumps Reference Material Sensors System Design Training Valves CommunityBlogs Our Editors Learning ResourceseBooks Fluid Power Basics Fluid Power Circuits White Papers Salary Survey FAQs Basics of Design Calculate with Air WallChart Compressed Air For Automation Wall Chart Hydraulics Wall Chart Mobile Hydraulics Wall Chart Webinar DirectoriesDistributors Directory Industry Links Manufacturers Directory Designer's Guide Advertisement Home > Technologies > Maintenance > Hydraulic System Flushing Procedures Hydraulic System Flushing Procedures During flushing procedures, fluid velocity is critical to successful removal of manufacturing and installation debris from hydraulic systems. In theory, this leaves the inside walls of the fluid conductors at the same cleanliness level as the new fluid that will be installed. Download this article as a PDF This file type includes high resolution graphics and schematics when applicapable. This equation reinforces that statement: NR = VD/v where V is fluid velocity in fps, D is ID of the fluid conductor in ft, and v is fluid kinematic viscosity in ft2/sec. That is, the hotter the oil, the higher the NR for the same fluid velocity and pressure. Thus, specifying that Reynolds number should be 3,000 is not a stringent requirement but is well within the normal operating fluid velocities of a system. (This region of viscous drag at the conductor wall is known as the viscous sub-layer.) There is a transition zone within the turbulent flow range where flow resistance goes from being governed by turbulence effects to being governed by the roughness of the inside wall of the conductor. This higher velocity results in a Reynolds Number of 11,671, which corresponds to a flow rate of 39.8gpm. This is shown clearly when inspecting the Moody diagram, Figure 2, which graphically demonstrates the relationship between Reynolds number; friction factor, f; and the roughness of the conductor’s inside surface, e. E.

Boundary layer fluid at the interior surfaces of the fluid conductor remains undisturbed. Only when the Reynolds number is high enough to cause surface projections of the conductor walls to extend beyond the viscous sub-layer does the surface come in contact with the turbulent flow, thereby affecting the pressure drop in the conductor. When Reynolds numbers fall between 2,000 and 3,000, flow exists in transition, sometimes called the critical zone. Reynolds numbers are dimensionless and used (along with other factors) to classify fluid flow as either laminar, turbulent, or somewhere in between, Figure 1. Even at the recommended maximum fluid velocities and NRs for hydraulic-system working conductors, fluid flow still is not turbulent enough to greatly affect contamination on conductor walls. Sponsored Introduction Continue on to (or wait seconds) . Contamination that is built into systems during manufacture and assembly must be removed before start-up to insure proper and predictable system performance throughout its service life. Apache Tomcat/7.0.35. Then, during normal operation, the system will experience only externally and internally generated contamination that can be controlled with filtration.

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