avoiding wear in centrifugal pumps

... Eastern interest in studying certain areas of engineering, particularly nuclear engineering, was an indicator of a desire to develop a nuclear capability Another indicator of emerging or existing ... reserved Avoiding Surprise in an Era of Global Technology Advances http://www.nap.edu/catalog/11286.html 26 AVOIDING SURPRISE IN AN ERA OF GLOBAL TECHNOLOGY ADVANCES As indicated at the beginning ... information superiority MAINTAINING INFORMATION SUPERIORITY IN THE FACE OF GLOBALIZATION AND COMMERCIALIZATION The information technology revolution is on par with the Industrial Revolution in...

Ngày tải lên: 28/03/2014, 11:20

... EBARA PUMPS EUROPE S.p.A CENTRIFUGAL PUMPS series - version CONSTRUCTIONS 50 Hz Rev D MECHANICAL SEAL SERIES REF Rotary seal ring Stationary seal ring O Ring O Ring O Ring Self driving spring ... side bearing cover G25 Impeller side bearing cover 1 G25 Casing ring [3] AISI 304 Casing ring AISI 316L AISI 304 AISI 316L Lip seal - Lip seal - G25 Flexible coupling Base Fe 37 Screw Stainless ... cover Aluminium Fan Polypropilene Fan cover Fe P04 Zinked - Terminal box Terminal box cover Splash ring Aluminium (three phase version) NBR - 1 Pump side ball bearing - Fan side ball bearing - 21...

Ngày tải lên: 30/03/2014, 11:20

... requirements for centrifugal pumps, including pumps running in reverse as hydraulic power recovery turbines, foruse in petroleum, heavy duty chemical, and gasindustry services In case of conflict between ... head in multistage pumps) due to cavitation within the pump 1.4.42 radially split: Casing or housing joint that is perpendicular to the shaft centerline 1.4.43 rated operating point: The point ... methods, including tack welding, require the purchaser’s approval.diamThe eter ofa hole in a wear fing for a pin or threaded dowe shall not be than one thirdthewidth of the wear ring 2.6.4 Running...

Ngày tải lên: 02/04/2014, 15:32

... high-tech machine requiring advanced skills, sophisticated engineering and extensive testing When attempting to describe the state-of-the-art in hydraulic engineering of centrifugal pumps, the focus ... exchange between the individual streamlines takes place in a laminar flow In contrast, mixing movements perpendicular to the flow occur in turbulent flows in which eddies of finite magnitude ensure ... impeller inlet 240 5.6.3 Influencing the onset of recirculation at the impeller outlet 240 5.6.4 Eliminating a type F instability 241 5.6.5 Influencing the saddle-type instability of impellers...

Ngày tải lên: 02/04/2014, 15:33

... exists in the equal-pitch inducer, long equal-pitch inducer The pressure in the inducer’s inlet is lower in the two-long and two-short inducer In order to know the pressure distribution on the inducers, ... in detecting and diagnosing incipient faults in induction motors and centrifugal pumps through the analysis of vibration data, obtained using accelerometers installed in various locations on ... Lr are the winding inductances which include the leakage and magnetizing inductances of the stator and rotor windings, respectively The inductance Lsr is the amplitude of the mutual inductances...

Ngày tải lên: 27/06/2014, 11:20

... Analysis Pump maintenance files Failure analysis on centrifugal pumps Why is this pump in the shop? 226 226 227 228 16 Avoiding Wear in Centrifugal Pumps Introduction Erosion Corrosion Wear rings Fluid ... resistance changes Long term resistance changes Pumps in parallel and pumps in series Pumps in parallel Three tips Pumps running in series Combined parallel and series pump operation 92 92 92 ... Purchasing agents have to make costly decisions with inadequate information at their disposal Process engineers and operators are charged with maintaining and increasing production The focus of industrial...

Ngày tải lên: 27/06/2014, 17:20

... Dewatering Pumps Wet Pit Pumps Water Supply Pumps Condenser Cooling Water Pumps Cooling Tower Pumps Flood Control Pumps Transfer Pumps Barrel-Mounted or Can-Mounted Pumps Condensate and Heater Drain ... Vertical Pumps 113 by Erik B, Fiske Configurations Well Pumps Wet Pit Pumps Barrel-Mounted or Can-Mounted Pumps Applications Well Pumps Water Well Pumps Incline-Mounted Pumps Cavvi ern Pumps, Mine ... are influenced by viscosity and any increase results in a reduction in head generated and efficiency, with an increase in power absorbed (Figure 1-5) Centrifugal pumps are routinely applied in...

Ngày tải lên: 29/06/2014, 16:20

... extensions staying completely in those j dimension and a single other one going on step in positive direction in dimension j + In our implementation we exploit this kind of symmetry by “normalizing” states ... closing a loop of length – both transfering to state ω (3.2) A step in the same direction as the previous step, transfering us back to state again (3.3) A step in any other of the remaining 2d ... numbers g (d,k) (n) Since a self -avoiding walk does not contain loops of any length, we can obtain an upper bound for the number f (d) (n) of self -avoiding walks by simply subtracting g (d,k) (n)...

Ngày tải lên: 07/08/2014, 06:20

... associated with infection or inflammation (synovitis, tendonitis, wear process) [2] Variables that affect the wear of a polyethylene bearing in vivo include the following: wear resistance of the materials ... which was inconclusive Inflammatory markers were again stable The pain disappeared shortly after the scan The pain recurred once again years after surgery and examination revealed a tender point at ... acquisition and interpretation of the data; 2) were both involved in drafting the manuscript or in revising it critically for important intellectual content; and 3) have both given final approval...

Ngày tải lên: 11/08/2014, 20:20

... Analysis Pump maintenance files Failure analysis on centrifugal pumps Why is this pump in the shop? 226 226 227 228 16 Avoiding Wear in Centrifugal Pumps Introduction Erosion Corrosion Wear rings Fluid ... resistance changes Long term resistance changes Pumps in parallel and pumps in series Pumps in parallel Three tips Pumps running in series Combined parallel and series pump operation 92 92 92 ... Bearing maintenance Bearing seals 155 12 Pump Shaft Packing History Vegetable fibers Reciprocating action Packing Rotary action Synthetic fibers Compression packing The lantern ring The packing...

Ngày tải lên: 13/08/2014, 09:21

... diameter (8 inch) to maintain the discharge head and pressures, but you would be converting the inch suction nozzle into a inch suction nozzle This would reduce the fluid velocity entering into the ... losses expressed in feet in the suction piping and connections Hi = Inlet head, or the losses expressed in feet that occur in the suction throat of the pump up to and including the eye of the ... 17 Know and Understand Centrifugal Pumps Bachus Custodio formula explained in Chapter In most cases, the pump is relatively close to the vessel being drained by the pump In this case the Hf is...

Ngày tải lên: 13/08/2014, 09:21

... packing w Valve stem packings on valves in the suction piping syndrome Figure 3-3 ~ Know and Understand Centrifugal Pumps w Joint rings on suction piping w Flange face sheet gaskets at pipe joints ... pumping ring) between both sets of faces on: w Vertical pumps w Lift pumps and pumps in suction lift conditions w Pumps in vacuum w Pumps operating to the right of their best efficiency point (BEP) ... the resulting seal, bearing and pump failure Too many maintenance people (engineers and mechanics) are running around in circles, wringing their hands, and jumping up and down, trying t o deal...

Ngày tải lên: 13/08/2014, 09:21

... facturing in general, we observe that there are more centrifugal pumps About 90% of the pumps in industry are centrifugal pumps And the PD pumps found in industry have much in common with their centrifugal ... specific applications, than centrifugal pumps in general applications However, in heavy industry, meaning metallurgical (steel and aluminum) processes, mining, petroleum refining, pulp and paper production, ... moving it through a pipeline and increasing the pressure, but they it differently Positive displacement pumps ~~~ ~~ - ~ Positive Displacement pumps perform work by expanding and then compressing...

Ngày tải lên: 13/08/2014, 09:21

... points for every one thousandths wear in a wear band beyond the factory setting Therefore, by changing wear bands, the pump is returned to its original efficiency Because of this, the term wear ... impeller, thus expanding the operating window of the pump The Ns is a guide in selecting the adequate volute design The Ns is useful in analyzing a problematic pump and in purchasing a new pump When ... using these Nss values, we can interpret the Nss Graph, and get a picture of the operating window of these three pumps To interpret the graph we start on the left column at the flow in gpm In...

Ngày tải lên: 13/08/2014, 09:21

... curves appear to be descending with an increase in flow instead of ascending Sometimes, instead of showing the horsepower consumed, what we see is the standard rating on the motor to be used ... piping adds friction head (Hf) There could be new variations in the levels in holding tanks, affecting the static head (Hs) The increase in flow will affect the pressure head (Hp), and the increased ... engineer, the maintenance engineer, and purchasing personnel At the beginning of this chapter, we stated that the system governs the pump This being the case, the pump always operates at the intersection...

Ngày tải lên: 13/08/2014, 09:21

... consider an arrangement of pumps running in parallel, or in series, or in a combination of the two Pumps in parallel are two or more pumps working side by side, taking the The System Curve (Hf ... simply by doubling the velocity of the fluid in a pipe Sometimes, in an existing system, the engineer orders to install a new control For example, installing a flow meter into a pipe increases the ... of pressure gauges installed into the piping numbered through In this system drawing, pressure gauges 1, 2, and are in the suction piping Gauges and are in the discharge piping With the system...

Ngày tải lên: 13/08/2014, 09:21

... curve of the pumps running in series Combined parallel and series pump operation ~~ Finally, we consider an arrangement of pumps running in combination Know and Understand Centrifugal Pumps Figure ... of inferior diameter This could be induced or caused by maintenance in cases where the mechanic installs a check valve in reverse, or uses inadequate practices when rebuilding valves, cutting ... tips that apply to pumps in parallel, also apply to pumps in series Depending on the profile of the system curve, one solo pump running in a series arrangement may be running to the left of its...

Ngày tải lên: 13/08/2014, 09:21

... the internal bearing housing and shaft seat before installing the bearing rn Clean and paint all un-machined internal surfaces inside the bearing housing with oil resistant paint w Do not spin ... inner ring or race and an outer ring or race With pumps, the inner ring mounts onto, centers, and rotates with the spinning shaft The outer race is stationary and seated into a bore in the bearing ... or roller in the bearing assembly Some pumps have a site level indicator showing the oil level inside the bearing chamber It is recommended that you install these indicators if your pumps don’t...

Ngày tải lên: 13/08/2014, 09:21

... contaminants, like dust and water, from entering into the bearing housing, while it maintains the lubricating grease or oil inside the bearings If a dust particle or drop of water tries to enter into ... Reciprocating action in engines and pumps was again converted back again into rotary action at the beginning of the last century First, the rotary turbine was perfected Shortly afterward, the internal ... effective in retaining grease and oil and especially the oil fogs (described earlier in this chapter) inside the bearings By holding positive pressure, neither contaminants nor humidity can enter into...

Ngày tải lên: 13/08/2014, 09:21

... either inside or outside the pump This seal is easy to install, adjust, and maintain It permits easy access and cleaning of the pump internal parts, often required in the food processing industry ... mounted on a shaft in the seal chamber of the pump (Figure 13-18) Static ‘0’ring Spring Dynamic ‘0’ring Rotating face Stationary face Static ‘0’ring Self alioning springs Disaster bushing APi 10 11 ... the cooling line can be eliminated Balance explained by math In the following illustration, the pressure inside the pump is 100 psi and the area of the seal exposed to the pressure is in2 Therefore,...

Ngày tải lên: 13/08/2014, 09:21