Marine Pumps Research Articles

The Influence of Mechanical Treatment Type on the Tribological Properties of Flame Sprayed Ni-5% Al-15% Al2O3 Composite Coatings

During operation of marine pumps, one of the most common disability is tribological wear of shaftneck cooperating with the gland. In the practice, worn shafts are exchanged for new or are regenerated bychromium plating, padding or thermally sprayed of ceramic coatings, mainly Al2O3. In this article, the use offlame sprayed Ni-5%Al-15%Al2O3 composite coatings were proposed. The surfaces of coatings by turning,grinding are burnishing treatments were formed. Tribological properties of composite materials are dependent onthe proportion and size of the reinforcing phase particles contained in a metal matrix. A reinforcement compositewith very small dimensions and the amounts may result in increased wear and increase the coefficient of friction.It is therefore important to check whether the advisable of phase composition will not adversely affect the wearof the composite and the cooperating the part. The presence of a 15% volume fraction of the alumina particles onthe selected tribological properties of the Ni-5%Al matrix composite coatings were evaluated. In order to assessthe effect of the applied tapes of finishing on wear of composite coatings, the tribological tests were performedon the "T05" tribometer with head roll- piece type. It has been found that the burnishing favors a lower wear ofcomposite coating and the cooperating element compared to the coatings after turning treatments. At the sametime observed more than ten times less wear intensity of composite coatings in the initial time of friction, whichmay indicate a shorter time needed to running-in of cooperating elements.

Water Hummer Technology for Soil Destruction on Dredgers

The present investigation aims to propose a solution of the problem which is connected with slurry processing during the dredger’s operation under difficult conditions. On dredgers, depending on the degree of air dryness or low ambient temperatures very often arises technical problem that creates difficulties for the crew. It is connected with the fact that soil surface layer is very dense. It is very difficult to dredge the soil during extraction under water surface or unloading from the hold of a vessel at low ambient temperatures. The top layer of the very soil is characterized by a high degree of compaction and can be destroyed in two ways only. The first way is to use very powerful mechanical equipment (percussion mechanisms, vibration equipment, etc.). This method is associated with high energy spending and its use on a vessel is technically difficult. The second way is to use the soil cutting process with the use of mechanical cutters. Dredger’s operation with the use of milling equipment is always characterized by the fact that during soil mechanical treatment there is always occurs breakage of the cutter teeth or rapid wear of the cutting surfaces. A similar problem occurs when sandy or clay soil is extracted under water, which is compacted by its properties. In investigation a non-trivial solution was used to solve the problem of destruction of the compacted soil layer during the operation of the dredger. It was proposed to use the hydrodynamic method based on water hammer as the main mechanism for the destruction of compacted soil. As a result of the interaction of the compacted soil layer and high pressurized directed water jets, good performance of the dredger can be achieved. The two-dimensional mechanism of destruction of the compacted soil layer can be described by the condition of dynamic equilibrium of the three main flows - the jet, which flows from the conical nozzle and two flows along the soil surface. For these streams, a reactive force evaluation has been performed. Destructive jets can be generated by standard marine pumps in combination with the use of water hammer. Based on the results of the experiments, it was found that the qualitative destruction of the surface layer of compacted soil occurs using two or three phases of hydraulic water hummer.

HHI to manufacture pumps in Saudi Arabia

Hyundai Heavy Industries (HHI) and Saudi Aramco are to set up a joint venture in Saudi Arabia to produce engines and marine pumps.

Optimization of vibro-diagnostic method for marine rotating pumps

Techno-economical optimization of vibro-diagnostic method implies defining of the minimal number of vibro-diagnostic information, which could be used for precise and definite diagnosis of broad spectra of failures or malfunctions with all types of rotating machines in standard use, including marine pumps. Economic optimization is done based on competitive advantage approach, but in coherence to technical aspect. Techno-economical optimization in this research is analysed more from the aspect of the optimization problem new formulation, then from the aspect of mathematical apparatus for solving the problem. In this case, the optimization is based on establishing the possibility of certain defect appearance at marine rotating machines and implementation of causal relations between diagnostic model and defined goal functions values.

Effect of Annealing Treatment on Erosion-Corrosion of Zr-Based Bulk Metallic Glass in Saline-Sand Slurry

Bulk metallic glass (BMG) may be a good candidate to solve the erosion-corrosion (E-C) problems of marine pumps in sand-containing seawater. Since annealing treatment is an effective way to improve plasticity of BMGs, the effect of annealing treatment on E-C wear of Zr-based BMG in saline-sand slurry was investigated. All of the annealed BMG samples were crystallized and the quantity of (Zr, Cu) phase increased but that of Al4Cu9 phase decreased with the increase of annealing temperature from 360 to 480 °C. Accordingly, annealing treatment enhances plasticity of the as-cast BMG at the cost of hardness and corrosion resistance. Moreover, 480 °C annealed BMG sample possesses the highest hardness and the lowest corrosion current density in all of the annealed BMG samples. Using a slurry pot erosion tester, the E-C wear of the as-cast and annealed BMG samples was studied under different impingement angles, impact velocities, and concentrations in saline-sand slurry. With the improvement of plasticity, 480 °C annealed BMG sample exhibits the best E-C wear resistance under high impingement angle, high impact velocity, and high sand concentration.

舶用ポンプ専業メーカーからポンプ総合メーカーへ - 舶用ポンプと歩んだ60年

舶用ポンプ専業メーカーからポンプ総合メーカーへ - 舶用ポンプと歩んだ60年

船用ポンプの変遷と将来の展望

船用ポンプの変遷と将来の展望

Analysis and Optimization of Marine Pumps Take-Off and Landing Platform Based on ANSYS

Marine pumps take-off and landing platform is one of the important parts on the dredger, with its high performance, high benefit, make the pump under complex conditions running steadily, work safely and reliably, to ensure that the concentration of desilting. Its finite element model was established by applying the software ANSYS, the static analysis and buckling analysis of the model was carried out, the bench structure was improved according to the results of the analysis, in order to predict the performance of the work at the design stage, and provide theoretical basis for structure optimization design platform.

Slurry erosion–corrosion behaviour of high-velocity oxy-fuel (HVOF) sprayed Fe-based amorphous metallic coatings for marine pump in sand-containing NaCl solutions

Corrosion and slurry erosion–corrosion (E–C) behaviour of FeCrMoMnWBCSi amorphous metallic coatings (AMCs) compared with 304 stainless steel was investigated by static electrochemical measurements and weight loss tests under rotating conditions in simulated seawater. E–C rates of the AMCs increased with flow velocity, particle size, sand content and NaCl concentration. The AMCs are preferentially attacked at coating defects. The superior E–C resistance of AMCs can be attributed to the high micro-hardness, alloying elements and amorphous microstructure. The AMCs with better slurry E–C resistance may be good candidates to solve the E–C problems of marine pumps in sand-containing seawater.

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Double-acting oil tankers benefit from AC drives for marine pumps

The world's first double-acting oil tankers (DAT), the M/T Tempera and Mastera, are fitted with electric cargo and ballast pumps controlled by AC drives supplied by ABB. This solution has a number of advantages over conventional pumping systems using steam turbines or hydraulic motors.

Erosion — corrosion of duplex stainless steel under Kuwait marine condition

Erosion — corrosion of stable passive metals like Duplex Stainless Steels (DSS) proceeds by the repeated removal and repair of the oxide film. When sand particles are entrained it can be a problem in marine pumps, piping systems, heat exchangers, and units handling seawater in the Arabian Gulf for use as part of desalination plants. More specifically, sand particles in the presence of seawater enhanced the erosion corrosion problem. If the passive film structure is stable, it will reform spontaneously when it becomes damaged. The erosion-corrosion study is concerned with the application of a jet impingement apparatus to study the behavior of DSS steel of Cr/Ni/Mo/N grade in simulated Arabian Gulf seawater. An interference color imaging technique (ICI) for thickness measurement of the oxide film passivity, pitting, and transpassivity of the surface of DSS has been developed under the effect of well defined hydrodynamic condition and potentiodynamic polarization technique. Electrochemical imaging technique of surface corrosion potential mapping (SCM) was also introduced to measure the rate of repair of the passive film combined poteniodynamic polarization under flowing conditions, both with and without the addition of sand particles. The main aim is to obtain a better understanding of the electrochemistry of DSS alloys in marine erosion–corrosion condition and to examine the viability of SCM and ICI to be used as a diagnostic tool for DSS material evaluation. The results indicated that both techniques gave optimum imaging analysis of DSS steel. Water jet impingement showed higher current densities at the ferrite dissolution potential and austenite pitting potential during the introduction of sand particles.

Marine pumps help to raise the H.L. Hunley

On February 17,1864, the H.L. Hunley became the first submarine in the world to sink an enemy ship. The confederated submarine from the US civil war torpedoed the USS Housatonic, a Union blockade ship, just 4.5 miles off the coast of Sullivan's Island, South Carolina. When signaling to shore about the succesful attack, however, the Hunley inexplicably sank in 35 foot of water and was never heard from again. Thanks to the help of some dedicated people and some specialized pumping equipment the vessel has now risen again.

Johnson Pump — Watch this space!

In its 30 year history Johnson Pump has grown from being a small Swedish company based in Örebro into one of the most significant suppliers on the international pump market. Always a leading manufacturer of marine pumps with a strong brand name world-wide since the acquisition of Stork's pump division in 1996, Johnson Pump has strengthened its position in industrial and process pumps through-out Europe and other parts of the world.

Submerged electric motor pumps for marine liquefied gas cargo

This article covers a highly specialised area of marine pumps. Although there are not large numbers of these pumps around the world, they make an important contribution to the carriage of difficult fluids by sea. Liquefied gases are normally characterised by high vapour pressures. Hence to maximise the quantity carried, containment systems are designed to carry the fluid in bulk as refrigerated liquid.

Corrosion - cavitation resistance of tin and aluminum bronzes

1. Tin bronze OTsSN3-7-5-1, which has a low cavitation and corrosion—cavitation resistance, should be replaced with more resistant alloys in marine pumps. 2. Of the alloys tested, the corrosion—cavitation resistance in sea water is highest for bronze AZhMts 10-3-1.5, which can be considered a cavitation resistant alloy. 3. Alloys for hydraulic applications should be selected on the basis of cavitation and corrosion—cavitation resistance.