Thanks btrueblood,but I'm going to be restricted to using equipment that is designed and manufactured for oil and gas use, and in this case specifically, water injection pumps, using vendors that are internationally recognised such as Rotork - as far as I can tell, their linear actuators are...
I'm involved in a project where the discharge lines of my WI pumps are to be retrofitted with globe valves - the intent is to use pneumatic actuators to control the valves(10 inch stroke) requiring additional new air packages to be procured. I'd like to try and simplify things, asking if...
Hi David...I'm 100% with you on this.
Try this one for size - see what nonsense us poor Brits have to put up with.............
http://www.templar.co.uk/downloads/Lilley-Stern_Rebuttal.pdf
I remember it just as a B+K marketing/brand differential thing - their own spectrum of a spectrum technique, claimed to be be good for analysing gearbox vibration. Others that are of similar value: Kurtosis (for finding rolling element bearing faults), full spectrum (marketed by Bently Nevada -...
MTTF/MTBF data is just about site specific - depends largely on fuel type and quality (gas/liquid), quality of air filtration , duty (power gen/gas compression). Wash regime contributes as well.
These factors can vary enormously from site to site and give widely varying MTTF/MTBF
Somewhere in the O+M literature there will be a statement (most likely from the seal vendor but endorsed by the package supplier) along the lines of 'supply gas temperature must be at least 20 deg C above its dew point': this will ensure that there is no liquid dropout within the seal, to meet...
You need to think about what entropy really is. Basically, the universe is running down (think of it as a giant watch spring that is slowly unwinding, with no means of rewinding it). The second law of thermodynamics says that whenever energy is exchanged or converted from one form to another...
"The moisture in the buffer gas is intended to lubricate the seal"
"The adsorbed gases on graphite are an important part of it lubricant effect."
Sorry guys - the working gap in a typical dry gas seal is 3 to 5 microns and you want absolutely nothing in that gap except CLEAN, DRY gas - no...
Quote "to maintain seal supply gas at a minimum of 20° C (36° F) above dew point at the seal faces"
This requirement is prevent liquid drop-out.
Rule # 1 for Dry Gas Seals: They need CLEAN DRY GAS -this applies to the sealing gas and any buffer gas
I fail to see how providing 'over dry' gas...
Thanks for the your responses and apologies - I should have written things a little more clearly.
The system is MEG reclamation: the first pump in the flow line is fitted with a single cartridge seal and a Plan 11 flush. The next pump in the flow line is fitted with a pressurised dual seal...
Does anyone have a reference which defines how 'clean' a 'clean' fluid for use in a Plan 11 system should be?
I have a system where a pump fitted with a Plan 11 flush (single seal bellows) precedes a Plan 53B (pressurised dual seal bellows) and I'm not entirely sure that the Plan 11 is...
Thanks for the replies.
The vendor has told us that the seal faces are carbon graphite on silicon carbide with a low coefficient of friction which can accommodate these ‘dry’ starts as long as the pump is allowed to run for a reasonable period of time in order to remove any heat from the seal...
BK19702
Please re-read my post - this is NOT a horizontal pump and it is definitely Plan 13.
This is a vertical turbine type pump and the seal chamber is effectively in the discharge line. After passing the seal, water is discharged to atmosphere (i.e to sump/suction) via an orifice.
We are commissioning some vertical sump (water) pumps, fitted with single inside cartridge seals configured for API Plan 13. The level of the sump can vary between 2 and 4 meters below the discharge/seal. Startups and runtimes are intermittent and on startup, since the flush is taken from the...
Here's another 'less mathematical' version:
Fast
Good
Cheap
You can only ever have two of these qualities applied to a project. Select the two you want and you automatically get the opposite of the one that is left
EPete:
I only got the first couple of pages downloaded - how do you know vibration is in rms terms? Do you use similar equipment?
Are the phase angle readings relative or absolute? The phase angle difference between V and H suggests that a single balance would work if you could get access...
Define high vibration? What criteria are you using to judge the severity? Is the vibration measured in peak or rms terms?
Taking your data at face value, your vibration is predominantly 1X with 3.4mmsec@354 deg (H) and 1.7 mm/sec@245 deg (V) - looks like residual unbalance - but the...
