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
Centrifugal Pump
A centrifugal pump is a machine that uses rotation to impart velocity to a liquid and then converts that velocity into flow. Let’s break that definition down into its components so that we can consider each one in turn: A centrifugal pump is a machine. A centrifugal pump uses rotation to impart velocity to a liquid. A centrifugal pump converts velocity into flow. “A centrifugal pump is a machine.” Every centrifugal pump includes an assembly of mechanical components that make operation of the pump possible. This mechanical assembly includes the pump shaft mounted on bearings, the sealing mechanism that keeps the pump from … Continue reading Centrifugal Pump
Design draft vs Scantling draft ( full words )
The Draft, as simple definition is the distance between the sea level and the bottom of hull (included the thickness of bottom – see this topic) Meanwhile, at the initial design stage, there are two terms of Scantling & Design … Continue reading Design draft vs Scantling draft ( full words )
Protected: Ship IMO type I, II, III (full words)
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What is CJP in welding
According to AWS D1.1 requirement (The others like ASME IX, EN ISO 15614. API 1104 doesn’t) CJP (complete joint penetration): A joint root condition in a groove weld in which weld metal extends through the joint thickness. There are two … Continue reading What is CJP in welding
Back gouging in welding
When welding on thick plate or pipe, it is often impossible for the welder to get 100% penetration without some type of groove being used. The groove may be cut into just one of the plates or pipes or both. On some plates it can be cut both inside and outside of the joint. The groove may be ground, flame cut, gouged, sawed, or machined on the edge of the plate before or after the assembly. Bevels and V-grooves are best if they are cut before the parts are assembled. J-grooves and U-grooves can be cut either before or after assembly. … Continue reading Back gouging in welding
In-situ Buttering welding
In-situ Buttering is deposition of a layer of weld metal on the susceptible surface (‘buttering’) prior to filling the joint ensures that strains due to the weld passes in contact with the steel are low. Or it is special buttering type different from the others – See Buttering vs Buildup in welding The deposition of low strength weld metal is deposited firstly on the susceptible plate before filling the joint with another electrode. However, before adopting this technique, design calculations should be carried out to ensure that the overall weld strength would be acceptable. Notes: Some O&G project has allowed using … Continue reading In-situ Buttering welding
Buttering vs Buildup in welding
The buildup is a surfacing variation in which surfacing material is deposited to achieve required dimensions. The term buildup denotes the addition of weld metal to a base metal surface, the edge of a joint, or previously deposited weld metal for the restoration of the component to the required dimensions. In this case, the strength of the weld metal is a necessary consideration in the component design. The Buttering is a surfacing variation used to deposit surfacing metal on one or more surfaces to provide compatible weld metal for the subsequent completion of the weld. Buttering differs from buildup in that … Continue reading Buttering vs Buildup in welding
Backing vs Retainer in Welding
The backing is defined as material placed at the root of a weld joint for the purpose of supporting molten weld metal. Its function is to facilitate complete joint penetration. Permanent backing is usually made from a base metal similar to that being welded and, as the name implies, becomes a permanent part of the joint because it is fused to the root of the weld and is not easy to remove — See: Backing in welding for more information. Temporary backing may be made from copper or a ceramic substance that do not become fused to the root and are easily … Continue reading Backing vs Retainer in Welding
AMARINE 