A general introduction about NPSH in CENTRIFUGAL PUMP (Advanced) article. But the confusion raised that you still not understand how it works and how to evaluate the NPSH … Continue reading NPSH – How much is enough? (theory and exam)
For marine work, we have tank and pipe to store & transfer oil. Now this topic will search about the effect of Zinc coating for tank and pipe in fuels oil. The concentration of zinc in a fuel was found depend upon … Continue reading Zinc in the Fuel oil (affection on Machinery explanation & experiment, gears, and prevention)
One of the most important factor when inspect a pump is to find out the real Static Head or How much height that the pump can lift the fluid . ( See the CENTRIFUGAL PUMP (Advanced) to see how to calculate the pump … Continue reading Pump Head vs Discharge Pressure (Easy explanation and examples)
There is two type of flushing as below which are enough for pipelines flushing. 1. Chemical flushing (pickling). 2. Oil flushing. CHEMICAL FLUSHING (PICKLING) The purpose of chemical flushing is to remove any dirts, debris, oil, grease, rust, scale, ect form the pipelines. During … Continue reading Pipe Flushing (Full procedure, standards NAS, Filter selection, magnetic filter config.)
It’s well known that the SUS materials (piping) very often demand a final step of surface treatment, i.e. passivation, in order to achieve a product with acceptable visual appearance and high corrosion resistance. The passivation process removes chips and “free iron” contaminations left behind on the surface from different fabrication operations. These contaminants are potential corrosion sites that may result in premature corrosion and ultimately in deterioration of the component if not removed. There many argument and penalty during chemical tanker building with those relating to Painting schedule and Passivation quality. All the jobs are conflicted and much delayed on … Continue reading Passivation of Stainless steel
Rule No. 1 Position the pump in an accessible location. When laying out the system, give some consideration to the people who eventually will have to look after the pump that easy access and working room for routine maintenance. Also, make sure overhead space is adequate for lifting devices and working clearance. Rule No. 2 Make the pipe diameter on both the inlet and the outlet sides of the pump at least one size larger than the nozzle itself. On the horizontal inlet side, an eccentric reducer is required to decrease the size of the pipe from the suction line … Continue reading Pitfalls of Pump Piping design
When the centrifugal pump is not primed ( filled with liquid ) before starting, the air pocket inside the pump case may give rise to formation of vortex and discontinuity of flow those lead to make noise, vibration and damages to the impeller. Priming is done by pouring liquid in to pump casing ( when pump is not running ) through a funnel and air will be displaced through an air vent provided on pump case. The formation of air pocket inside casing can be avoided by following methods: 1 – Installation of pump below the suction level 2 – … Continue reading PUMP PRIMING (Notes)
There’re some confusing fluid mechanic principles, you may understand it during learning individually. Meanwhile, it’s real difficult and daunting to gather and compile all the theories to design a reasonable pump configuration as the demand. In this post, we’ll break down the anatomy of all concept through the centrifugal pump curve (Characteristic curves). The pump characteristic curve shows the performance of a pump. It usually shows TDH-Total dynamic Head, Power, Efficiency and NPSHr plotted over Flow rate at a given RPM. In these diagrams you can estimate pump behavior at constant speeds and a range of impeller diameters. Constant horsepower, … Continue reading CENTRIFUGAL PUMP (Advanced)
Well for the inspectors, trainees, and freshers who just move into the piping systems will have their introduction, with fluid transporting devices which are mainly “PUMPS“. Almost piping system have the basic and the mostly optimized device know as centrifugal pump those are handled easily and it is cheaper when compared to other pumping devices, even maintenance cost is much lesser than the others. But the LIMITATION ( •cannot handle entrained air – 3%max •cannot handle viscous liquids) THERE’RE 5 MAIN PUMP STYLES: 1-Horizontal Split Case good wear resistance (Mean of higher price ) suction and inlet are opposite high head pressure ( Cooling … Continue reading CENTRIFUGAL PUMP (Introduction)
AMARINE 