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I don't have the numbers with me at the moment, but the NPSHA for the existing system is far below the NPSHR for pump A when the far tank has low levels of liquid. If I swap out that 4'' piece on the suction side of pump A to a 6'' piece, I greatly increase the NPSHA to pump A. In questions 2...

Hi Guys We have a pump island that is roughly halfway the distance from one of our tanks and a discharge point on the jetty. See last page in the attached document for illustration. Pump A is typically used to pump to the jetty, however, whenever the big tank is used, the flow rate is about...

Hello, I have contractors blasting and painting the inside tank bottom with Jotun Tank Storage Comp A. However, I need the tank to be in service sooner than expected. The paint has to be applied when the RH is < 85%. The various drying times reduce as the temperature increases. Are there any...

But wait a sec. The oily water separator is used to separate storm water from any petroleum products in the bunded area and not for discharge of the petroleum in the event of a catastrophic failure of the tank, fire or no fire. If there is a catastrophic failure of the tank, then there is...

Thanks for the responses. The oily water separator will not receive oily water from other bunded areas and it does not have a burner. Granted the products in the tanks are stored under atmospheric pressure, jetting from a low level hole is a concern of mine but the distance between the tank and...

Yes, I am talking about storage tanks for hydrocarbons (mogas, gaspoil, fuel oil) but I do not think NFPA 820 applies to us. It applies mostly to sewers and places that treat waste water.

Is it in violation of any code if it is located in the bunded area?

thanks. that helps.

Hello, Can an oil/water separator be located inside the bund wall of a tank farm?

I saw that Littleinch. But I need to know what the density value is at 27 degrees Celsius. Wikipedia has it for 0 degrees Celsius.

Liquefied propane that is.

Hello, Can you tell me the density of propane at 27 degrees Celsius?

No need for the sarcasm, David. The line is about 30ft. long. By waiting, what percentage of entrained air would leave the fluid? And under what mechanism would it do so? In my estimation, lowering the pressure above the surface of the liquid (not less than the liquid's vapour pressure of...

A vacuum pump hooked up to the line can get rid of a lot of that entrained air in no time. After which the vacuum pump can be disconnected and the pressure pump connected.

Check http://theleeco.com/engineering/liquids/bulk-modulus.cfm 3.5% entrained air for a fluid having a working pressure of 100psig can have its bulk modulus reduced by 90%.

Not particularly, its for filling cylinders with bayonet valves. Aside from that, I can measure certain dimensions off of it.

David, have you ever used deaerated water or fuels? I just found an interesting graph that shows the effect entrained air has on the pressure loss. Littleinch, thanks for the heads-up. I am slowly gravitating towards using water as the fluid to apply pressure.

I checked the website but none there correspond to what I need.

Thanks everyone, you have all been a tremendous help. I'll let you know how it goes.

I need filling tips like the one in the picture to fill our 9kg cylinders. Where can I find them? http://files.engineering.com/getfile.aspx?folder=e165c5e8-d67c-42ef-af98-3a2679adead8&file=IMAG0150.jpg