I see now that the article georgeverghese linked to makes a distinction between loading speed for "splash loading", and the flow limit that applies to charge generated by the flow of liquids through pipes. The 1 m/s velocity limit applies to the charge generated from "splashing", while the...
LittleInch,
I'm not "that worried" about static - I'm just trying to better understand and properly apply the criteria for controlling it. In the case of the feed pipe, the velocity will be controlled to a level below the limit for a non-submerged fill pipe, so I shouldn't have much if any...
The first part of my question is independent of the static charge generation concern, or of the conductivity or flammability of the material. The question is entirely related to the 'smooth' dispensing of any liquid onto a tank wall without splashing or spraying.
Regarding the "related note"...
Related to thread378-239797, I'm interested in design criteria for designing a feed pipe that directs a top-fed fluid onto the inside wall of a tank. If the velocity in the feed pipe is at most 1 m/s to limit static charge generation, how do I ensure that the fluid then flows gently down the...
With regulators, they don't tell you where "100%" is - they often just give you a plot of operating curves (reduced pressure vs. flow), where each one represents some arbitrary set pressure, and those plots may traverse all the way to the right-hand side of the chart, or otherwise just end at...
When sizing a relief valve for a failed regulator scenario, what is typically done to determine what the "failed" characteristic of the regulator is? I'm finding it difficult to get a vendor/manufacturer to tell me a "fail Cv" for their regulator, or even what the internal orifice diameter is...
Seems to me that the wrapping must have an insulation effect. If liquid has escaped the flange, then the bolts have already been heated to the point of expanding. The goal is to insulate the bolts to prevent them from expanding and releasing any product in the first place.
... and I also wanted to add that our facility started phasing out wafer-style butterfly valves some time ago. We now only use lug-style butterfly valves. The best solution for this problem is to avoid using long-bolt style devices in flammable service. We do, however, still have a handful of...
Does anybody know what makes an acceptable fire-protective wrap for a flangeless/wafer component? Are there companies that fabricate/install a product for this specific purpose, or is it something I can simply ask a general piping and vessel insulation contractor to make up?
I asked our...
It is apparent that given a fixed system geometry, and a constant available pressure differential, that the mass flow rate will be greater if the whole system is at a high pressure that keeps the material in a liquid (or supercritical) phase, vs a lower pressure where two phase, or vapor only...
The problem with the electrical analogy is that the addition of the resistor does not change the inherant characteristics of the electricity itself. The concept behind the orifice scenario is that there is a change in the phase, thus changing the "electricity" itself to something that behaves...
My thought was that this scenario, if possible, may only hold true in certain very specific situations, so even if I did the math and showed that it did not hold true for one scenario, I've by no means disproved the concept. I was hoping that someone could show me that the concept was bogus...
Suppose there's a pipe connecting two vessels that is very long relative to its diameter, and there is a pressure differential between the tanks driving the flow of liquid through the pipe. Now suppose that somewhere along the length of this pipe the pressure-drop causes the fluid to flash...
