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There are a couple of things you can try 1. If on a switchboard adjust the low voltage trip and also the voltage imbalance trip, this will increase the tollerance to low voltage situations. 2. If on a VFD do the same and dependant on the VFD you may be able to adjust the ride through time...

TD2K I'm talking about the system curve. If it's flat, and I think that's where the greater % of the head requirement is friction, a change in speed via a VFD will move the pump operating point along the system curve. Therefor, if it's flat, rate will change but head remains almost constant dadfap

Is a flat system curve typical of a discharge system that is characterised by friction losses rather than any vertical lift component? In a flat system curve, a change in the speed of the pump by a VFD will not 100% follow the affinity laws? Thanks DADFAP

Does anyone have a graphical representation of the Rockwell scale, showing differing metals and sand? Thanks dadfap

samlukeben There are cables designed for just such an application. They are strapped to the side of the tubing to ensure fluid mobility the length of the tubing. These can be run with an ESP or without, Centrilift manufactures cables for this type of application. regards dadfap

Tgatica From personal experience, I disagree with the comments made by phex. Having lived in hot climates most of my life (Australia, Saudi, Kuwait) I prefer any method whereby the sun's rays are prevented from striking glass. This is mainly because you can't get any heat transfer that way...

My understanding of the leakage current is that if it stabilises or reduces during the rest period when the ultimate test voltage is reached the cable is good. If the cable leakage current continues to increase then the cable is problematic.

DOWS were being touted as a fix for environments that had water handling constraints on surface a few years ago. They have not been the runaway success that everyone hoped for, principally because few operators took the time to properly study and evaluate the disposal zone. The hydrocyclone...

reiszal abandonment of a well is where the well is plugged, usually with cement plug or the like. try the service company websites www.bakerhughes.com www.halliburton.com www.weatherford.com one of these should be able to assist if you contact them. all the best dadfap

reiszal well killing is an operation where fluid, weighred water etc, is pumped into the well bore to hold back the reservoiu7 fluids. the idea is to have a weight of fluid in the annulus greater than the pressure of the reservoir, thus ensuring that the well does not flow during operations.

okie, what type of pump are you using? I agree with tstead, you are asking a lot of any pump, why is the VSD not an option? If it is purely the capital cost of the VSD then I would imagine that a lot of this can be offset by the pump efficiency gains. Where is the recycled fluid going...

buzzp the reactors in the bottom of the drive may well have been part of the DC link filter circuit not anything to do with the application mentioned above. Your comment on the flat cable is correct, it is electrically a pain in the *, but does allow additional clearance in the restrictions of...

Mrepp Let me take another stab at this. I had to talk to some others to get my mind around this. Let's make sure that I am on the same page as you with the definition of GVF. GVF is simply the amount of gas taking up space in any given volume at a given set of conditions. There is no direct...

Mrepp Solution GOR (Gas / oil ratio)is the amount of gas that will come out of solution as the pressure is reduced and is usually expressed as scf/STB. In solution the gas is refered to as dissolved gas. Solution GLR (Gas / liquid ratio) is the same as the above except that it is expressed as...

gatz This will work for you BHP = [Q x H x SG] / [3960 x Eff] Q = rate in GPM H = Head in FT SG = specific gravity of pumped fluid Eff = efficiency of the pump All the best DADFAP

ADNPD Go to the following page. It explains the IPR equation. http://www.centrilift.com/9Step/Step2a.htm There are one of 4 methods that are used in oil wells 1. Constant PI (Productivity Index)traditionally used in high water cut wells 2. VOGEL which is used where more complex fluid...

rebuh72 the head is not defined by the type of pump you are using. the head calculation will not change all the best dadfap

grcontrol why not just set the pump below any perforations or coal seam fractures. offloading the hydrostatic is what allows gas to migrate to the well bore. if you pull down to around the level of the perforation you will get max gas rate and unless the fluid velocity is high, all the gas...

jOmega, I have never believed the numbers given for MTBF, but here's how from an operational standpoint I have tracked increases in MTBF and the influencing factors for the VSD systems I sell. 1. Improved power supply in remote areas, desert oilfield, resulted in an overnight reduction in...

I am working on project that is using gensets to drive motors for centrifugal pumps and no-one is ready to recommend genset sizes. Details Motors are 127HP, 255Hp & 537HP @ 50Hz (all 380v) Will be starated on digital soft staarters Loads are centrifugal pumps. Generators my client has...