In barrel tkvb vertical pump tkvb pumps are canned centrifugal multistage vertical pumps. Basics concepts of operation, maintenance, and troubleshooting, part i. Centrifugal pump with mechanical seal, normal suction. Our allrounder is often used when chemically aggressive or corrosive fluids and wastewater have to be handled reliably and safely.
All rotos sealless pumps and equipments are engineered to comply with latest industrial pump standard. Iso 2858 sealless centrifugal magnetic drive pumps api 685 sealless mdp pumps for petroleum industry in addition rotos produces custom. Once a seal is selected, our trained technicians can modify stuffing boxes, substitute component materials, reinstall the seal and pressure test the entire pump. As a manufacturer for mechanical seal centrifugal pump we give explanation info. This fourth paper in the troubleshooting series deals with mechanical seals. The seal is a common wear part that should also be periodically inspected. Mechanical seals for centrifugal pumps select seals. To enable your ksb pumps to operate at their best, we offer lowwear mechanical seals that have been developed inhouse for different pump type series. Typically mechanical seals are installed on pumps and mixers. The seal is located on the shaft behind the impeller. Mechanical seal in centrifugal pump gn solids control. The mechanical seal is the pump component exposed to the most intensive wear. Price new from used from unknown binding, 2000 please retry. In the u pump series, the motor power is transmitted without slip directly to the pump impeller with a rigid shaft no magnetic coupling.
But one thing we havent really discussed is what happens to a centrifugal pump when a seal fails. This video takes the viewer through the process of dismantling a pump, inspecting the real components, fitting the mechanical seal and assembling the pump ready for operation. Working mechanism of a centrifugal pump a centrifugal pump is one of the simplest pieces of equipment in any process plant. A centrifugal pump is a roto dynamic pump that uses a rotating impeller to increase the pressure of a fluid. How to replace mechanical seals in centrifugal pumps. Centrifugal pumps are commonly used to move liquids through a piping.
The initial closing force ensures that the seal will function properly from startup. Mechanical shaft seal types and sealing systems grundfos. Every centrifugal pump must accommodate a spinning shaft while mechanically maintaining fluid or gas contained in the wet end of the pump. Do not touch the front face of the seal, as it is highly sensitive to the oils on your fingers. The previous article in this troubleshooting series on seals from stan shiels dealt with the pumps. Mechanical seal for centrifugal pumps phillips petroleum co. Read the entire how to pick an hvac centrifugal pump series. Should service be required, this manual can be a valuable guide. Download practical centrifugal pumps design, operation. Fluid enters a centrifugal pump through the suction nozzle at the center of a rotating impeller. Installation and operation manual selfpriming centrifugal pumps important. This copy of the manual is a translation of the italian version and both. This international standard specifies requirements and gives recommendations for sealing systems for centrifugal and rotary pumps used in the petroleum, natural gas and chemical industries. Centrifugal pumps wate tc 9 4 ordering information 9 nominal impeller diameter pump model volute design rotation shaft seal fit impeller material model description order no.
The materials of seal construction, particularly the sealing faces and elastomers. Centrifugal pump definition centrifugal pump can be defined as a mechanical device used to transfer liquid of various types. Failure of mechanical seals in centrifugal pumps this fourth paper in the troubleshooting series deals with mechanical seals. Generally, the hp increases as we increase the capacity. In plan 11, product is routed from the pump discharge to the seal chamber to provide cooling for the seal and to vent air or. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different. These highhead centrifugal pumps are selfpriming after the initial. After sealing design of centrifugal pump, its mechanical seal is improved greatly, and improve the efficiency of the centrifugal pump. Spare parts lkh centrifugal pump harco enterprises. A double mechanical seal back to back prevents the leakage of the media to be pumped and ensures the leak proof sealing of the centrifugal pump.
The mechanical seal can also be field installed to assure a positive fit and true alignment. In the drawing, figure 1 is a diagrammatic cross section of the drive end of a centrifugal pump showing my improved packing. Internally flushed seals require less service and help extend the life of the pump. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services. Some single mechanical seals also have pumping rings. How to respond to mechanical seal leakage in a centrifugal pump in order to understand centrifugal pump leakage, its important to first understand the basic operation of a centrifugal pump. Centrifugal pump with mechanical seal, normal suction hmsseries. Seal care specializes in manufacturing genuine replacement mechanical seals for all major pump manufacturer. Pdf a study aimed at seal selection efficiency for centrifugal pumps in the oil and gas industry is presented. A mechanical seal consists of 2 principle components. In end or rotatingface mechanical seal designs, the initial closing force is provided by a spring component, which can be a single coil spring, multiple coil back to basics. If a mechanical seal is stored installed in a centrifugal pump, the preparation and storage conditions for both components must be considered together. Vertical axis alignment is ensured by special smooth bearings in the pump, in the support and in the guides interposed on connection pipe. In many cases, the centrifugal pumps are performance tested or hydrostatic tested on water prior to storage.
Mechanical seals consists primarily of a rotary seal face with a driving mechanism which rotates at the same speed as the pump shaft, a. Part of the seal will be attached to the impeller, while the other part will be attached to the motor shaft. Grundfos crn shaft seal kit pump cartridge mechanical seal cr32 45 64 90 grundfos sarlin pump 62kw pump model s. Nspl pump seal design api 682 based on api 682, all mechanical seal shall be cartridge design. In the updo pump series, the motor power is transmitted without slip directly to the pump impeller with a rigid shaft no magnetic coupling. Seal life since the seal must function as a slider or friction bearing, the seal has an unpredictable life span. Mechanical seals for pumps how mechanical seals work.
Same casing as used for conventional centrifugal pumps. Installation and operating instructions repair parts list close coupled motor driven centrifugal pump 14 0694 important for best possible performance and continuous, satisfactory operation, read these instructions before installing your new pump. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Replacing the mechanical seal on your centrifugal pump. Centrifugal pump seals mechanical seal installation. Checklist of problems vvith centrifugal pumps and their causes. To detach the shaft, first hold the shaft in place using a wrench. Regardless of whether the application calls for a standard, highpressure, or trash, every centrifugal pump lifts and discharges water in the same way. M pumps process srl via dellartigianato, 120 45015 corbola ro italia tel.
In every pump, the mechanical seal is one of the most important components. Built for high performance and easy installation, we offer cartridge mechanical seals in numerous configurations an seal face material options to meet your needs. A mechanical seal prevents the leakage of the media to be pumped and ensures the leak proof sealing of the centrifugal pump. Seal chamber and stuffing box both refer to a chamber, either integral with or separate from the pump case housing that forms the region between the shaft and casing where sealing media are installed when the sealing is achieved by means of a mechanical seal, the chamber is commonly referred to as a. As a result, the quality and durability of a mechanical seal have a major influence on the. Once the new seal is on the shaft, use the wrench once again to screw the impeller back on. The most effective method of preventing the leakage of the fluid from the centrifugal pump to the external surroundings is using the mechanical seals. Failure of mechanical seals in centrifugal pumps part two. As the name suggests, it relies on the principal of centrifugal force. Centrifugal pump with mechanical seal some are required by gn solids control clients for drilling mud system. Centrifugal pump seals, mechanical seal installation. It converts the energy provided by a prime mover, such as an electric motor, steam turbine, or gasoline engine, to energy. Mechanical seal failure has an effect on many different parts of a pump, including the pump shaft.
Pdf analysis of mechanical seals for highspeed centrifugal gas. Centrifugal pump with mechanical seal gn solids control. Our experience and technical ability allow us to offer our customers original replacement mechanical seals for pumps at a significantly lower price than that of the pump maker. The mechanical seals help sealing the rotating part of the shaft against the stationary part of the pump housing. Since our subject is dealing with pumps, lets first explore a basic understanding of the need to seal a process liquid in a centrifugal pump.
Its purpose is to convert energy of a prime mover a electric motor or turbine first into velocity or kinetic energy and then into pressure energy of a fluid that is being pumped. This video takes the viewer through the process of disassembling a pump, inspecting the seal components fitting the mechanical seal and assembling the pump ready for. The obvious function is that of a check valve to prevent liquid under pressure from leaking out of the pump, or from drawing air into the pump when under vacuum conditions. Checklist of problems vvith centrifugal pumps and their causes centrifugal pumps are one of the worlds most commonly used devices. Plan 11 is the default seal flush plan for all single seals. Often a seal failure is diagnosed through visual inspection of the failed seals components.
As the impeller rotates, its vanes fill with fluid, then force it out to the pump casing where it exits the pump. To find out how seal failure affects the pump shaft, i talked to one of our most experienced service technicians. These are typically used with api 682 plan 23 arrangements, as shown in fig. Centrifugal pump curves characteristics continued bhp brake horsepower and capacity for the centrifugal pump to deliver the capacity we want, we must supply the pump with a certain hp. Slide the new mechanical seal along the shaft of the motor. The stationary part of the seal is fitted to the pump housing with a static seal this may be sealed with an oring or gasket clamped between the stationary portion and the pump housing. Delmar company offers cartridge mechanical seals for centrifugal pumps from top manufacturers. The effects of mechanical seal failure on centrifugal pumps. The seal of a centrifugal pump is usually replaced many times during the life of the pump. Next week we will look at the materials of construction of hvac centrifugal pump seals.
Loosely inserted seal face provides selfadjusting capability. Whether the pump is part of a brand new installation or is a replacement for an existing pump with an external seal. Contact us for the cartridge seals or repair your pumps need. How to respond to mechanical seal leakage in a centrifugal. Flowserve mechanical seal and seal support system storage. Introduction the mechanical seal acts as a check valve and a slider bearing. As the flow enters through the impeller eye of the pump and up the impeller vanes, the fluid is at a lower pressure and low velocity. Nees mechanical seal pumps have universal applications.
Read all instructions in this manual before operating pump. Often a seal failure is diagnosed through visual inspection of the. Mechanical seals are designed to overcome these drawbacks. The shaft seal is a sealing element which seals the rotating shaft of a centrifugal pump where it passes through the nonrotating pump casing, reducing fluidleakage to atmosphere or the entry of air from outside to a certain level, and keeps wear of the sealing faces as low as possible pumps are specially designed and manufactured to cater for a whole range of different applications. As mechanical seals can be used to seal a myriad of different products on an equally vast array of equipment, we will be primarily focusing on the use of mechanical seals on rotating shaft pumps.
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