Hi All,
We are currently putting together a design for a Lubricating Oil Rig and are trying to determine the optimum tank size for storing the Lubricating Oil. The flow rate this system will give is quite high at 3600 litres per minute, and a tank size of 36000 litres would usually be used to...
I was trying to calculate the Cv for a Double Block and Bleed Metal Seated Triple Offset Butterfly Valve which is basically 2 valves in one casting. I only have the Cv rating for a single disc / valve so this calculation should give me the Cv for the complete valve. Ok there is a section of...
Thanks guys. The earlier posts had me confused for a while there. This is the first time I'd come across this formula so wanted to check it was correct - as BigInch mentioned, not all formulae posted on the web can be trusted!!
Cheers
Thanks Guys, however I am still not convinced.
I would say that in SERIES the valves are installed on the same line, one after ther other as follows:
--->--->----
But in PARALLEL, the line / flow is split so there are 2 PARALLEL lines running alongside each other:
--->---
--->---
This is...
Hi BigInch,
What do you mean by 'Cv for series assemblies add directly' - are you able to give us an example?
If I was installing the valve I mention above in PARALLEL then the calculation would would be:
Cvt = Cv1 + Cv2
Cvt = 9482 + 9482
Cvt = 18,964
Giving an overall Cv of 18,964.
Hi BigInch,
I'm not sure what your point is. The image you have embedded shows 2 valves installed in parallel, not in series. If you scroll down the web page I linked in my earlier post it shows and image of the valves installed in series, along with the calculation for this. Cv for parallel...
Hi Guys,
I have been looking for a formula which can be used to calculate the overall Cv values for 2 valves installed in series and came across the following from http://www.engineeringtoolbox.com/adding-kv-cv-d_1120.html. The formula given reads as follows (I have substituted Kv for Cv):
1 /...
Thanks Stan,
Have you ever had any dealings with BS 15614-1 also? According to this standard there are 4 different set-ups for qualifying a weld:
1. Butt Joint in Plate
2. Butt Joint in Pipe
3. T-Joint in Plate (Fillet)
4. Branch Connection in Pipe
Taking this into account it makes sense what...
What considerations do I need to make to ensure I have qualification to weld a 88.9mm OD (7.8mm wall) pipe to a 14mm thick slip-on flange? We work to BS 15614-1, however if you are able to provide details on how this is covered by ASME this should still answer my query.
At the moment we have a...
Thanks for the information guys.
Regarding the Superheat you mention that is already present, this system is a long way from the Boiler House so whilst the Design Pressure is 11.5 BarG @ 330 degrees C the actual Pressure / Temperature is going to be a lot lower and will more than likely match...
I am looking to install a Pressure Reducing Valve into a Steam System, where the System Design Inlet Pressure is 11.5 bar @ 330 degrees C and the Outlet Pressure is 3.8 Bar. Will the Temperature of the Steam drop when it passes through the PRV as the Steam Tables show 3.8 Bar Steam to have a...
I am trying to take a sample of molten glass from a furnace using some high temperature metallic hose with some sort of vacuum sampler to draw the glass out. The temperature of the glass is 1100 degrees Celcius. Has anybody ever heard of such a thing before or know of any better ways I could go...
