Centrifugal Pump Casings

The centrifugal pump casing is the component of the pump that converts all of the velocity created by the rotating impeller into a controlled and stable flow and directs it out of the pump through the discharge point. The most common type of casing is called a volute and it looks similar to a snail shell. Image from A Brief Introduction to Centrifugal Pumps by Joe Evans, Ph.D The impeller is placed within the volute. However, as you may have noticed in the image above, the impeller is not typically centered in the volute. Instead, the impeller is positioned so … Continue reading Centrifugal Pump Casings

Centrifugal Pump Impellers

The impeller of a centrifugal pump is rotated rapidly to impart velocity to a pumped liquid. If you’ve never seen a pump impeller before, visualize a boat propeller. When a boat propeller is rotated it imparts velocity to the liquid around it. As the liquid moves, that velocity forces the propeller to move forward in the water. Now imagine what would happen if the boat were anchored in place, firmly enough to prevent the boat from moving. Next imagine that the velocity generated by the boat propeller were contained and controlled so that a stream of water was created that … Continue reading Centrifugal Pump Impellers

Pump Components: Volutes, Casings, and Impellers

When you boil them down to the most fundamental components, pumps are made up of two components: An impeller which creates velocity through rotation, And a casing which converts velocity into pressure. There are different types of impellers and different types of casings. The way that different types of impellers and casings are combined produces all of the different types of pumps. Types of Pump Casings There two basic types of pump casings: volutes and diffusers. Whether we’re talking about volutes or diffusers, what all casings have in common is that they are designed to take energy in the form of … Continue reading Pump Components: Volutes, Casings, and Impellers

BOLT/NUT GRADE & MATERIAL SELECTION (Easy understand and select correctly the grade)

This short guide is intended to give a very basic introduction to ISO metric nuts and bolts. It is intended for those working in plant and machinery maintenance to give enough information to ensure that correct replacement parts are identified … Continue reading BOLT/NUT GRADE & MATERIAL SELECTION (Easy understand and select correctly the grade)

CJC Desorber / Filter unit: what is it?

Dear all, This topic we will talk about CJC Desorber / Filter combine unit! These below questions will be discussed and we will know general about CJC unit. 1) What is CJC? 2) Application? 3) How does it made? 3) How does it operate? 4) Why do we need it? 5) How to use? … Now we start: 1) What is it – CJC unit? Sometime we see it in Stern tube Lub. Oil P&ID dwg: CJC Desorber/Filter Unit is a combined product used for maintenance of oils. The unit removes large amounts of water and particles from a wide range of lubricants including … Continue reading CJC Desorber / Filter unit: what is it?

Propeller System: Bolt Tightening for Propeller Blade!

We will talk about How to tight for bolts of blades after assembly! Have some method to do it. But in this topic we will say a simple way to do it & not need modern equipment or tools to do. We will use chain locker! We will take an example for easy understand! 1.Mounting propeller blades: Blades marked according to above figure , Aft view. Mounting sequence: 1-3-2-4. 2. Bolt tightening for blade: – Both pre-tighten and final tighten of the blade bolts with can be done by using socket adapter and ring spanner (a chain block suspended wrench) … Continue reading Propeller System: Bolt Tightening for Propeller Blade!