Search results for query: *

Hi, Trying to make sure I'm not doing something really dumb. Working with pipe support guys to see how a new piping arrangement effects an existing pressure vessel nozzle. Nozzle is on a cylindrical shell, perpendicular to the shell. Looking to calculate the vessel spring constant (flexibility)...

Hi, I'm looking to calculate the amount of 14% NaOCl solution to dose a water flow rate of 2000 m3/hr and leave 1 mg/l of residual Chlorine. I assumed it was a simple calc, 1 mg/l = 1 ppm, so 2 litres needed an hour. At 14% that 2/.14 = 14.3 l/hr, was my thought. However a colleague told...

Hi, Just to say I have heard of this problem, I think it was to do with lifting carbon seal rings on a specific John crane design, since rectified. If you check out John crane literature on the type 83 for example it specifically states it's good for cryogenically dry N2. Cheers JD

Hi Thanks for the replies, hadn't heard of transfluid or moongear before. That moongear sounds very interesting, not an applications I'd use but it's interesting to an engineer. I can't really take in depth about the project I am working on. Just to point out cost is 1millon+ not 10million...

Ok, thanks for the reply, a workmate thought a US company did a similar gearbox. VFD wasn't an option due to space constraints. Problems on the vorecon with a bit of vibration on the output shaft. Cost is well into 7 figures (euros).

No it's a fixed speed electric motor, 1500 rpm. The output range we need is about 10,000 to 15,000 rpm.

Hello, I've just been working on a project using a Voith Vorecon variable speed gearbox. An interesting piece of kit but with some problems, cost being one! Does anyone know of available alternatives to this technology, for high speed (12,000 rpm output) and high power (2MW+). Thanks

Hi again, Thanks for the replies, you picked up some stuff I didn't think about which was great. As extra info we have looked at and are still looking at alternatives to the trimming. Also the vendor denying liability, due to use not agreeing tolerances on the interstage pressures before...

Hello all. Background - Am purchasing a new 4 stage (single shaft) GT driven centrifugal compressor, approx 17 MW shared between the 4 stages. We have a number of side streams coming in an out, result the majority of the work is done by the 3rd stage, and 3rd stage discharge pressure sets the...

I think BP use 2% as their base point for new developments. Bound to be something about it on their website. It's a massive amount of energy when you think about it!

Hello, We've got a 2 stage natural gas compressor driven by a speed increasing gearbox, powered by a Rolls Royce Avon 2648 GT. On the coupling between the GT and gearbox is a torque meter. The coupling is being replaced as part of an upgrade and I want to make sure the new coupling is designed...

In answer to my own question (i've been swotting up). Calculating the torque by this method is correct but cannot be used to give an accurate start-up curve because it is based on rated conditions. However during start-up the system may have been partially or fully blown down, regardless the...

Hello, If I have a compressor with known speed and gas power required, can I simply use those two parameters to calculate the torque required. I.e. Torque = power/angular velocity. Can I further use the fan laws to calculate the power and therefore the torque at lower speeds which would give me...

A very old post I know but I've just been looking for a similar thing and found this document, the fluid cleanliness standards gives a good list of equivalents. http://www.parker.com/hydraulicfilter/cat/htm-3.pdf

Orenda, We have turbine trips traced had fuel valve failures (valve not opening enough when power demand increases), the valve vendor has dismantled them and is blaming large quantities of small particles deposited on some of the valve components. I have found some very useful information on...

Thanks for the posts guys, a good sanity check for me. We have 2 tanks so one settling, piping is stainless, storage is treatement carbon steel so pretty sure contamination is by source, we're in the FSU and the quality isn't really there. Mikehalloran, very interesting comments we're on a...

Hello, Not sure this is the correct forum for this, if not let me know if there is a more appropriate one. Am working on a offshore platform where we are having serious power turbine reliability problems (on gas/diesel dual fuel machines) traced to dirty diesel. The diesel piping is around 2m3...

Techcitizen/Enirwin Thanks for replies, have been offshore collecting more data and also from another site with a similar arrangement. Data logs show the pressure fluctuations at about 4 Hz, starting when the gear pump starts and continuing until turbine is loaded. Looks very much like gear...

Thanks guys for your answers. This has turned out to be a much more complex problem than I could describe here. Techcitizen, I neglected to point out that we have a pressure control spill back line already which holds the system pressure and therefore flow, thus this wasn't causing the...

Hello, On an offshore oil platform we have an Aero derivative gas turbines with a diesel back-up supply. With the GT vendors scope is a high pressure gear pump which is regulated using a spill back valve. The platform diesel system is circulated by a centrif pump. Manufacturer’s data on the...