Tagged With "Centrifugal Pump"

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Axial vibration - ring section boiler feed pump

Mile High_PumpFE ·
Hello....could use some help. We have a KSB 4/7 HGC pump in boiler feed service that I trying to get to the bottom of some vibration issues. This is a ring section pump, with radial sleeve bearings and no thrust bearing. The flanged balance drum...
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Vibration high IP/LP boiler feed water pump

Nguyen Thuy ·
I have any problem vibration high of IP/LP Boiler feed water pump. I need everybody help me .When value vibration of pump increasing 7.142 mm/s stop operation of pump. I have measurement vibration and see bearing NU314(SKF) defect. After that, new...
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Sinosidal vibration in ammonia centrifugal machine

UsmanS ·
We are facing problem in ammonia refrigeration compressor having mechanical seal installed at both ends to seal ammonia. This compressor operates at 11,100rpm. The compressor is 8 stage centrifugal machine with flow of 7631 m3/hr and power of 5323KW....
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Overhung IDF vibration increase gradually

amj.5 ·
Hi every one, An overhung type ID Fan encountered vibration which had been increasing(from 1.8 – ~6 mm/s). So many trials and efforts performed to identify the source of vibration while the fan was running but, unfortunately it was not that...
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Using a Gearbox for Detecting Torsional Vibration

David_G ·
It is an emergency fire pump. A diesel engine drives a vertical pump via a 1:1 ratio gearbox. The power train is volnurable to torsional resonance by design. Having no proper hardware required for checking torsional vibration/resonance I am thinking...
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Repeated Failure of Vacuum Pump NDE Bearing

RKDD ·
Hi, We have a mechanical exhauster/Vacuum Pump which is liquid seal ring type two stage vacuum pump.We are facing a problem of repeated failure of NDE bearing. The details are as below:- Pump Make:- NASH Type:- Liquid seal ring type two stage. Type of...
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2x

Gary Stacey ·
We have a horzontal single stage pump with journal bearings (integral to motor not pedestal) on the motor and rolling element on the pump. It is coupled by a longish coupling arrangement with metallic wafer type elements at either end. Just recently...
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hydrostatic pressure in a closed loop

senkaya ·
hi guys, i am trying to calculate how much water should i pump to reach a specific pressure in a pipe line which is closed by a blind flange at the end. i guess either bernoulli or pascal law explains my question but i couldn't figure it out. i know...
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High Pump Vibration

ALI HAIDERR ·
I have critical pump having following specifications Pump Power 450 KW RPM:2980 Over hung Flow Rate:1200 cubic m/hr I have been collecting data of this pump since 02 years,vibration remain 4.9 mm/s pk to 5.3 mm/s pk.I made call of bearing replacement...
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Vibration at 1X in pump & beating in Motor

Prabhu ·
Hi Please look into the FFT's attached. Pump Details : Multistage, Power - 3600 KW, Rated RPM- 2986. In the Motor DE Vertical predominant frequency is observed in the 1X RPM and in the waveform a beating @ 100 Hz is observed. Interestingly, Motor DE...
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Shaft centreline position

vibramac ·
Has anybody taken X/Y shaft measurements on a bearing type as per the attachment? Interested to know the behaviour of the shaft centreline and expected atitude angle with this type of arrangement (not sure what this bearing is called in the...
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Forum related question (non technical)

John from PA ·
From time to time a topic pops up with a symbol in the rating column. The symbol can be seen at present in the topics titled "Vibration at 1X in pump & beating in Motor", "Raw mill maindrive", and "Primary Air Fan High Vibration". Does anyone know how...
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Motor High Vibration issue

selva ·
Dear All, We are facing high vibration in the boiler feed water pump motor. The motor vibration was as follows. The motor RPM is 3000 Capacity - 450 KW Motor NDE Horizontal - 2.6 mm/sec Motor NDE Vertical - 7.9 mm/sec Motor NDE Axial - 6 mm/sec. Motor...
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pump shaft always cracking

Dieu Nguyen ·
Dear all, From 2007 to now, we have 02 pumps always broken shaft at near locking nut. We change size diameter from 22.5mm to 28.5mm but the shaft still crack. (shaft material: SUS 316) Please help us find root cause this problem. Please refer attach...
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motor high 1x vibration at outboard bearing

djokovic ·
Dear Expert, I have problem for our motor, directional vibration 1x at outboard horizontal also vertical direction but in the inboard is normal , see my attachment, this motor driven pump using belt, rpm motor is 1796, what do you think for this...
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pumps shaft axial play

manish0802 ·
may I get answer for query that I have assembled a pump overhung centrifugal with 7311-02 and 6212 bearing and shaft axial play was found 00 mm. is it necessary that axial play must be there??
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Wilson Snyder pump info

noknroll ·
Does anyone have bearing information for wilson snyder triplex pumps? I have a drawing that is circa 1985 that says it's applicable to models 316-P, 336-P, 336-P-ST, 346-P, 346-P-ST & 356P-D The drawing shows cup and cone thrust bearing with part...
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Operating beyond 110% of rated flow conditions

Khurram Rehman ·
What will happen if a pump is operated beyond 110% of its rated speed continuously. And kindly tell me what is the BEP in the performance curve attached along.
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Can't understand! Overall amplitude of velocity vibration, 500KW Ac motor

Lampard Nguyen ·
Hi every body, Our motor is AC inductance motor, the load is the pump, power is 500KW. With this motor, it's very difficult to understand the its problem. * When it operated at 35%-44% full load, the overall amplitude of velocity vibration (DE and NDE...
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Pump seal ferformance and axial float

spherical ·
Hi everybody, I want to hear others experiences of mechanical seal performance relative to shaft axial float. Can we expect seal performance not affected by axial float provided the limits are not exceeded? What float can a seal size 6.000D can...
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Is There a Motor Problem That Will Cause Increased Amp Draw

MikeC ·
We have a 2500 HP vertical motor driving a circulating water pump that is pulling more than the rated nameplate value. The motor is rated for 309 amps and we are pulling 330 amps. This pump was completely rebuilt a couple of months ago and has been...
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Question about Preventive Maintenance?

fatalshears ·
Hi guys, I am an intern at a small car manufacturer company. I currently have to work on a topic that required using Preventive Maintenance to reduce downtime. I have very little knowledge of maintenance (my field is sensor technology by the way)....
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Centrifugal pump motor overload tripping

SajjadAhmed ·
Hey all, We are facing overload tripping on motor of one of the centrifugal pumps installed at our plant. Upon inspection of impeller, there are clear erosion marks indicating cavitation. Just want to know whether pump cavitation can lead to motor...
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what's wrong with ?

STEAVE ZAZOU ·
Hello gentleman, i don't have experience on engine vibration analysis, can anyone help me what's goin on with our pump: we got three pump drive by engine,one of them (pump 1)got a vibration high compare to the other pump 2and 3 .the we change the...
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Component Design Studio, RBM Wizard

patrickmn77 ·
I am trying to add a motor & a rotary blower to my DB, What would you use for a component for the blower? A pump or a compressor?
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Are alignment specifications realistic?

Rick Little ·
I fully understand that the tight coupling alignments done today are an effort to do the best that we can and that tight specifications are written because they are achievable with the laser products on the market today, but I believe that an...
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Can you guess?

spherical ·
This is a centrifugal double suction pump start up. Operating speed around 2700rpm. During 3 start up in consecutive days the pump trip due to high vibration and only reached around 900rpm. I have found the cause of vibration symptom and later...
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ROTARY VANE VACCUM PUMP

Harpreet1962 ·
Recently did vibration analysis of a small Oil lubricated Rotary vane vaccum pump,7.5 Kw motor,4 pole.Vibrations were found ok on both motor and pump.But peakvue values are very high on pump side ie 12g and 19g respectively on driving and non-driving...
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Subharmonics of vane pass frequency

Pump Guy ·
Attached spectrum is from a double suction split case pump that has six vane impeller. There is 3X predominant peak in pump spectral data. Have you seen sub-harmonics of vane pass frequency. Thanks in advance for your contributions!
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Steam Turbine Issue

Mile High_PumpFE ·
Need some help and advice on a situation we have with a coal fired power plant in Kansas. The customer just had a new rotor installed in one of their main boiler feed pumps, which actually seized during coast down. The rotor has been pulled out sent...
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What causes a motor to draw higher than normal amps

MikeC ·
We have a large 2KW 4160 volt motor that is drawing higher than desired amps. It run straight across the line with no soft starts or variable speed system involved. It occasionally sets the digital protective relay into countdown mode because of...
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Boiler Feed Pump startup/shutdown transients

David_G ·
This is a single suction 5 stage BFP (motor-GB driven with no soft start) running at 4950 RPM below the first critical. Actual operating flow is about 85% of the rating. There were several occasions when balance assembly got wiped out. Bushing-drum is...
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steam turbine grease

Gary Stacey ·
We are looking for a replacement grease for our steam turbine grease system which services both the lower temp zones such as the turbine slides and valve linkages as well as the high temp areas such as the HP and IP valve crossheads. The grease is...
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How to solve the oil whirl problem in start up time?

Ngo Dinh ·
Hi everybody, I have a case with the oil whirl problem of low speed shaft of gearbox which make the vibration up to trip value and I can not run the pump (show some plot in file attached). I try to change the oil pressure from 2 bar to 2.4 bar and...
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Equipment Identification

Shurafa ·
I would like to hear from you the formal way your plant follows to identify the rotating equipment. For example, a boiler feed water pump can be identified by the following tags that are used at two different plants: 1. U3-BFWP-M: Unit 3 Boiler Feed...
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Is a rub in impeller indicated in data?

David_G ·
The attachment presents two issues with a 5 stage BFP running at 4950 RPM. Issue #1 shows an unstable orbit at low flow. The magnitude is still acceptable, while the shape may be questionable. What do you think? Issue #2 shows high magnitude orbits...
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Pump Gear 2X Sidebands

Andrew F ·
Hello All, A new gearbox model is displaying a vibration spectrum with prominent oil pump mesh frequency and harmonics w/ 2X sidebands. 1X mesh peak sidebands are expected when a tooth defect is present. What do these 2X sidebands represent? This is a...
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high axial vibration in a gearbox.

nst215 ·
Hello experts, I have a serious problem with a high axial vibration and lesser in radial direction in a gearbox. (see attached) there is a frequency of 43.8 Hz which I don’t know where it comes from. It is a frequency that apparently has nothing...
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Case study - low speed / high current due to misconnection.

electricpete ·
Attached - nothing earthshaking. Just routine example of somewhat common error in wiring which results in motor drawing higher current and lower speed than expected for mechanical load conditions. In our case the connections options are as described...
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Fire water P/P(being driven by Diesel engine)-regd

apparao ·
dear friends i need solutions to my problem at the earliest we have one fire pump(diesel engine driver), showing around 45mm/sec at Non drive end and 20mm/sec drive end at horizontal position, and vertical also around the same,spectrums shows 1x, 2x,...
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Steam turbine endshaft float - Axial displacement

Abu ehan ·
Dear EXpats, Drive Steam tubrine, driven: multi stage centrifugal Pump, service: Boiler feed water As we received a high axial displacement readings (.6mm)from turbine outboard end shaft but it was fluctuating from -0.01 to .6mm often. Part of...
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Wear marks in pump impeller

David_G ·
I was not sure which section would be the most suitable for this post and finally decided to try here. I was told by a rotating machinery repair guy that almost all impellers (wear rings)in the pumps he dealt with have had wear marks. This is a fair...
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Reading radial piston hydraulic pumps

Big J ·
We have a ton of pressure compensated piston hydraulic pumps (sawmill). How do you guys prefer to take readings on HPU units? If I take readings on these pumps while we are operating, they are extremely noisy (.3-.7 in/sec range overall). I would...
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High Current on the induction motor

Ngo Dinh ·
Hi Everyone, I have a case with a vertical pump (fresh pump) which the operating current of motor is higher than the rated current (rated current is 162A but now is 164A). The pump is conducted overhaul for both pump and motor. The vibration and flow,...
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low flow and cavitation

RE-Engineer ·
hi I have a pump that has caveatted due to running at a very low flow. Now I need to calculate the flow at which the pump will cavitate. I know it value is given by the vendor but I want to know how to calculate it. also the minimum continuous stable...
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Motor high vibration issue

pranab das ·
Hi guys, I have a Motor-Pump assembly showing high 1x peak.The vibration levels were 14 mm/s at motor de horizontal & 8 mm/s at motor nde horizontal(vertical and axial vibrations are low . The equipment is aligned recently. 1800 RPM Motor. Highest...
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Increased Vibration in NDE side of a Multistage Pump

Prabhu ·
In a Mutistage Pump (7 stage) Power - 3.25 MW (Motor Driven) RPM - 2985 Discharge Pressure- 220 bar Details and other data are enclosed in the attached file. Problem : The vibration amplitude in the pump NDE is observed to be in the increasing trend...
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centrifugal pump motor getting high amperage

SAIRAM ·
some one help to find the problem for my centrifugal pump motor getting high amperage "my motor max amperage rated is 10.5A but when its running it taking 60 amperage and triping
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Resume

Nagaraja ·
Hi, I am looking for the post of rotating equipment engineer in middle east, south east Asian countries. Resume attached for your reference. Kind Regards, Nagaraja
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vertical cantilever pump

SAIRAM ·
im having vertical cantilever pump its a length of 1.5m but my sump depth is 2.5m which means i can't able to use 1m of my sump so i want to extent my suction pipe upto 0.5m my question is, is that any problem will come in pump or motor because of...
 
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