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Pumping straight pipes

Uneven wear in parts is often due to turbulence. Bad piping designs or poorly sized valves can cause turbulence and uneven wear in pumps. Whenever possible, use straight pipe sections before and after the pump. Uneven flow creates turbulent flow and excessive wear occurs. [Pg.235]

It is not recommended to place an elbow at the suction of any pump (Figure 16-2, next page). This will cause a turbulent flow into the pump. If elbows are needed on both sides of the pump, you should u.se long radius elbows with flow straighteners. You should have 10 pipes diameters before the first elbow on the suction piping (Example If the pump has a 4 inch suction nozzle, you should respect 40 inch of straight pipe before the first suction elbow.) Short radius elbows cause vibrations and pressure imbalances that to lead to wear and maintenance on the pump. [Pg.235]

You should respect 10 pipe diameters before the first elbow in the suction piping (Figure 17-16). Example If the pump has a 6 inch suction nozzle, you should have 60 inches of straight pipe before the first elbow. [Pg.245]

A suction bell on the inlet of a vertical pump (or the inlet pipe of the suction side of a horizontal pump) is not necessary as far as pump or sump operation is concerned. If a bell is omitted, the entrance losses due to flow will be higher ith only a straight pipe, and this must be considered in pump operation. An economic comparison vsill help decide the value of the bell. Strainers should not be placed on suction bells unless this is the only arrangement. Inlet water should be screened with trash racks, bars and screens to keep the sump free of debris. [Pg.212]

A pump that is taking water at 50°F from an open tank at a rate of 500 gpm is located directly over the tank. The suction line entering the pump is a nominal 6 in. sch 40 straight pipe 10 ft long and extends 6 ft below the surface of the water in the tank. If friction in the suction line is neglected, what is the pressure at the pump inlet (in psi) ... [Pg.138]

Conclusions on pipe-fitting equations. Each of the ft values given in Table 6.1 is the experimental friction factor for that pipe size. This friction factor ft is not to be mistaken for the friction factor for straight pipe f. They are different discrete values to be applied per Eq. (6.11). Ku K2, K3, and KA each represent a different pipe valve or fitting. One could also be a control valve, item 10 in the pipe fitting list. The objective here is to add up all of the fittings expressed as K values and execute Eq. (6.11) to solve the pipe run pressure drop. In summary, this tells how much head hL the pump must put out in order to do the job. [Pg.226]

The line length from the pump discharge to the exchanger must have eight 90° ells, one check valve, one branched tee, three gate valves, and 150 ft of straight pipe sections. [Pg.227]

A polymer solution (density = 1075 kg/m ) is being pumped at a rate of 2500 kg/h through a 25 mm inside diameter pipe. The flow is known to be laminar and the power-law constants for the solution are m = 3 Pa-s" and n = 0.5. Estimate the pressure drop over a 10 m length of straight pipe and the centre-line velocity for these conditions. How does the value of pressure drop change if a pipe of 37 mm diameter is used ... [Pg.78]

For measuring the sodium flow rate of primary loop in the CEFR, it is intended to equipe an immersed sodium flow meter to the straight pipe left from primary pump. As its first prototype, a small immersed sodium flow meter with 3 m /h full scale has been developed (photo 4)in CIAE, Its basic error is less than 2.3% of full scale. /... [Pg.33]

A suction-piping elbow next to the pump aggravates cavitation, especially at high flow velocities. About five diameters or more of straight pipe between pump and elbow will minimize pressure disturbances near the elbow. [Pg.272]

In engineering systems local differences in mass transport rate are common. Examples are pipe bends, flow downstream from a expansion or complex flow fields in a centrifugal pump. Differences in mass transport rate can lead to local differences in the corrosion rate. Figure 10.27 shows mass transport rates measured downstream from a expansion in a straight pipe by determining the limiting current for ferricyanide... [Pg.447]

Example 3-2 A pump takes water at 10°C from a large open reservoir and delivers it to the bottom of an open elevated tank (see Figure 3-11). The level of the tank averages 48.77 m above the surface of the reservoir. The pipe is 0.076 m in diameter and consists of 152.4 m (160 feet) of straight pipe, six elbows, two gate valves, and 2 tees (L/D = 60). The pump delivers 0.00898 m /sec. What is the horsepower consumed if the pump has a mechanical efficiency of 55% ... [Pg.69]

Poor suction piping layout, too many elbows in too many planes, a tee branch almost directly feeding the suction of the other pump, or not enough straight run before the suction flange of the pump. [Pg.916]

Centrifugal pumps are highly susceptible to turbulent flow. The Hydraulic Institute provides guidelines for piping configurations that are specifically designed to ensure laminar flow of the liquid as it enters the pump. As a rule, the suction pipe should provide a straight, unrestricted run that is six times the inlet diameter of the pump. [Pg.521]

Concentric reducers should not be used to reduce suction piping diameter to that of the pump s inlet flange. This type of reducer may create an air pocket in the top of the piping and could lead to loss of pump performance resulting from air entrainment. Eccentric reducers should be installed with the straight side on top. This will reduce the potential for air pocket in the piping or the introduction of air or gas into the pump. [Pg.521]

A well-established and effective method of ensuring a laminar flow to the eye of the impeller is to provide the suction of the pump with a straight mn of pipe in a length equivalent to 5-10 times the diameter of that pipe. The smaller multiplier would be used on the larger pipe diameters and vice versa. [Pg.522]

SAE 10 lube oil (SG = 0.93) is being pumped upward through a straight 1/4 in. sch 80 pipe that is oriented at a 45° angle to the horizontal. The two legs of a manometer using water as the manometer fluid are attached to taps in the pipe wall that are 2 ft apart. If the manometer reads 15 in., what is the oil flow rate, in gal/hr ... [Pg.187]

A pump takes water from a reservoir and delivers it to a water tower. The water in the tower is at atmospheric pressure and is 120 ft above the reservoir. The pipeline is composed of 1000 ft of straight 2 in. sch 40 pipe containing 32 gate valves, two globe valves, and 14 standard elbows. If the water is to be pumped at a rate of 100 gpm using a pump that is 70% efficient, what horsepower motor would be required to drive the pump ... [Pg.232]

C-2.8.2 Yield for unidentified or used pipe is determined by using the pressure at the highest elevation within a test section, at which the number of pump strokes (measured volume) per increment of pressure rise becomes twice the number of pump strokes (measured volume) per increment of pressure rise that was required during the straight-line part of the pressure-volume plot and before any deviation occurs. [Pg.242]

D is in inches, Q in cuft/sec, p in ib/cuft, and p in cP. The factors involved in the derivation are power cost = 0.055/kWh, friction loss due to fittings is 35% that of the straight length, annual fixed charges are 20% of installation cost, pump efficiency is 50%, and cost of 1-in. IPS schedule 40 pipe is 0.45/ft. Formulas that take additional factors into account also are developed in that book. [Pg.100]

In Eq. (65) the friction factor was introduced as an empirical factor of proportionality in the calculation of the friction loss head. If Eq. (63) is applied to a length of straight horizontal pipe with no pumps, one finds that... [Pg.265]

Figure 6.10 An example of a recirculating straight open-channel design flume. The components are a = head box, b = collimator, c = open channel, d = weir, e = tail box, f = motor, g = axial pump, h = return pipe and cooling coil, and i = electric jacks. (Modified from Khalili et al., 2001.)... Figure 6.10 An example of a recirculating straight open-channel design flume. The components are a = head box, b = collimator, c = open channel, d = weir, e = tail box, f = motor, g = axial pump, h = return pipe and cooling coil, and i = electric jacks. (Modified from Khalili et al., 2001.)...
Estimated at 500k and 4,500 hr. Installation of a few pumps and tanks and approximately 4,000 feet of mostly straight alloy pipe. Minimal overrun potential. [Pg.392]


See other pages where Pumping straight pipes is mentioned: [Pg.408]    [Pg.23]    [Pg.232]    [Pg.86]    [Pg.584]    [Pg.52]    [Pg.42]    [Pg.112]    [Pg.74]    [Pg.77]    [Pg.216]    [Pg.80]    [Pg.567]    [Pg.115]    [Pg.390]    [Pg.142]    [Pg.242]    [Pg.242]    [Pg.654]    [Pg.1217]    [Pg.174]    [Pg.80]    [Pg.263]    [Pg.490]   
See also in sourсe #XX -- [ Pg.268 , Pg.270 ]




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