Understand pump install in series and parallel

CENTRIFUGAL PUMPS IN SERIES - HIGH HEAD
Putting your centrifugal pumps in series, or connected along a single line, will let you add the head from each together and meet your high head, low flow system requirements. This is because the fluid pressure increases as the continuous flow passes through each pump, much like how a multi-stage pump works.

For two different pumps, the head will still be added together on the combined pump curve, but the curve will most likely have a piecewise discontinuity (meaning to curve with protusions as pictured in in the 2nd pump curve below).

PUMPS IN PARALLEL - LOW HEAD / HIGH FLOW
Putting your pumps in parallel, or connected to any number of line branches so that each handles a division of the flow, will help you reach a low head, high flow operating point that a single pump cannot supply.

Going back to our pump curves, the combined curve for parallel pumps is created from the addition of the flow capacities of each pump. Two of the same pumps will result in double the flow while two different pumps will result in the addition of the flows.

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Keep the bearing cools

If the bearings properly designed and selection, there is little or no need to be concerned about temperature rises on bearings, under “normal” operating conditions. But there are a host of different conditions that can raise the rolling elements’ temperature to the point where it becomes a problem.

Here’s take a look at one of the factors that engineers can adjust to keep bearings cools.

In systems using oil bath or splash lubrication, bearing temperatures are quite sensitive to the level of oil in the sump. The common practice of setting the nominal oil level at the center of the bottom ball bearing ( so  h/d = 0.5 where h is oil depth or height, h, and d is diameter of the ball bearing) will work in most instances.

However, at extremely high speeds, even this level may not be enough. And if h/d is less than 0.5, you run the risk that imperfect maintenance or abnormal operating conditions will result in oil starvation and catastrophic bearing failure. In such cases, an oil flinger should be recommended to use. It provides an oil mist without requiring precise control of oil level.

Excessive heat generation reduce mechanical seal life

Excessive heat generation between seal faces will drastically reduce seal life. It typically occurs when a pump is flooded and/or the seal chamber is incorrectly vented before pump start-up that lead to excessive heat generation and dry-running.

Shaft run-out and elevated vibration levels may also cause interruption to the lubrication film established between mechanical seal faces during successful operation.

A mechanical seal is often the first visible point of a failure, but the root cause of failure may be located in a different part of the system. Using the correct piping system, verifying sufficient net positive suction head available, carrying out proper pump preparation and ensuring that pump functions are within the original equipment manufacturer's parameters are all important for reliable seal performance.

Understand the viscosity of motor oil

Picking the appropriate oil for your car's engine is very important. Before that let’s us understand the motor oil specification.

Viscosity [a fluid's resistance to flow] is rated at 0° F (represented by the number preceding the "W" [for Winter]) and at 212° F [represented by the second number in the viscosity designation].

So 10W-30 oil has less viscosity when cold and hot than does 20W-50. Motor oil thins as it heats and thickens as it cools. The more resistant it is to thinning, the higher the second number (10W-40 versus 10W-30, for example.

At the low-temperature end, oil has to be resistant to thickening so that it flows more easily to all the moving parts in your engine. Also, if the oil is too thick the engine requires more energy to turn the crankshaft, which is partly submerged in a bath of oil. Excessive thickness can make it harder to start the engine, which reduces fuel economy. 

A 5W oil is typically what's recommended for winter use.

However, synthetic oils can be formulated to flow even more easily when cold, so they are able to pass tests that meet the 0W rating.

Once the engine is running, the oil heats up. The second number in the viscosity rating--the "40" in 10W-40, for example--tells you that the oil will stay thicker at high temperatures than one with a lower second number--the "30" in 10W-30, for example. 

Bearing Protector to solve bearing premature failure

Mechanical seal type centrifigul pump, oftenly encounter bearing premature failure due to lubricant oil contaminate with water, where this water come from steam quenching for mechanical seal,  where the steam condensate travel through pump shaft entering the oil seal of oil compartment.

To solve this issue, a bearing protector is recommended to install. 

Ideally dual face bearing protectors, offering double the protection of a conventional single seal face design.