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Music hi Chris with RC Wurst here and since our product video on the square d pressure switches we've received some questions on how to adjust the switches pressure settings so remember before attempting any adjustments be sure to turn off the breaker or disconnect power going to the switch or to the pump you can find the factory preset settings inside the cover or on the box of the pump this particular one is preset to 30 50 so that would be the pump turns on at 30 psi and off at 50 if you have a submersible pump it's most likely going to be set to 40 60 because that's more common with with the submersible pumps and you'll even find some jet pumps usually smaller horsepower or some centrifugal 'he's more focused on irrigation that run on a 20 40 split you'll find most pressure switches operate with a 20 psi or 20-pound differential adjusting the center nut will raise or lower the range so you could potentially increase or decrease the range of that 40 60 or 30 50 I'm sorry that we're preset with so by tightening this middle set screw we're actually increasing or raising the pressure by whatever amount depending on the turns that we do here this particular switch is rated about 2 to 3 psi for every full rotation clockwise and that would increase the pressure 2 to 3 psi the smaller nut on the left hand side adjust the differential which actually only affects the high end pressure so for example on this 3050 configuration if I were to tighten this or go clockwise we would be increasing the 50 so 51 52 53 it increases depending on the number of times that you turn it so with this particular one it's a lot less adjustable than the large one and a lot of pressure switches have a range that this will work sometimes it's 5 10 or 15 psi depending on the switch let's go ahead and run this particular this pump through a cycle so you can see how the pressure switch operates and we'll also see what's going on with the pressure gauge so you can see the pressure is dropping once it hits that 30 psi mark the pump is going to engage and it's going to build up to our 50 psi and then shut off so let's say we don't have enough pressure in the house so we want to operate at a higher level of pressure let's go ahead and adjust this and what we want to do for for this example is we want to run at 60 psi so we want to increase this factory set switch to a 60/40 split so when I say 2 to 3 psi per turn that's going to basically be three to four turns for us to increase it so we have the breaker shutoff so now we'll get on here and do three.


“Which Tank will Will Fill up First? (example with 12 tanks, A to L, see question source for image)
This is a recent meme that’s getting shared on facebook and elsewhere. Repeating the image from the question source:This is a question that has gone viral recently. Most people answer “G”.But look closely, as the question says. Many of the pipes are blocked - the line that blocks off D from C is not a mistake.To find the real answer (this is assuming a low flow rate, as after all it is shown as a drip in the diagram):From A to B to C is straightforward. None of them can fill before the next one.J is a bit more complex. But as you fill J, as soon as the water rises to the outlet to L it overflows to L. So it can never get any higher. Yes, its level also rises in the outlet tube leading to I, but it can never get high enough to overflow to I.So it flows to L, which in turn fills F.So which fills first, L or F?By the time F is full, L will only be partly full (with the water at the same level for both).So your F is the answer.This video shows the idea, an animation by Nick Rossi using a physics engine, AlgodooIt doesn't quite flow like a real fluid, as he says, but it's enough to get the answer and show how it works.Here is another animation Which will fill first? from THE FLOW... by CorneliaXaosWhich will fill first? by CorneliaXaosThat answers the question, since it shows a dripping tap at a slow flow rate. But let’s go off on a tangent.WHAT HAPPENS IF THE WATER IS POURED INTO A AT A FASTER FLOW RATEIf the flow is very fast then obviously A will fill first. However, could any of the others fill up first before F and before A?It’s‡ governed by the Hagen–Poiseuille equation so long asthe flow is due to a pressure difference.the fluid is incompressible and Newtonian (water is, approximately).the flow is laminar (not turbulent) - it is with water if it flows slowly through a narrow pipe.through a pipe of constant circular cross-sectionthat is substantially longer than its diameter,and there is no acceleration of fluid in the pipe.All those conditions seem to apply. The pipes are substantially longer than their diameter which is one of the most important requirements. And they are narrow, and the fluid is water.Under those conditionsIf the outlet is above water, the flow rate is proportional to the height of the head of water above the inlet to the pipe. If the outlet is below water, it’s proportional to the difference in height between the water above the inlet and the water above the outlet.The difference in height of the water here is often called the “head” of water.It is inversely proportional to the length of the pipe.Or in short, the flow rate for laminar flow, in a pipe significantly longer than its diameter, is proportional to the pressure difference, and so to the head of water, but it is also inversely proportional to the length of the pipe.(it also depends on the radius of the pipe and the viscosity of the water but those are the same for all our pipes).Techy details. The equation is:There L is the length of the pipe and R is its radius.Q is the flow rate (what we are looking for).ΔP is the difference in pressure between the two ends of the pipe, which for water is proportional to the difference in height of the inlet and the outlet.Finally μ is the dynamic viscosityAll of those are constant (the pipes are all the same radius, and the viscosity is constant) except for L, the length of the pipe, Q which we are interested in and ΔP.So our equation simplifies to Q = c ΔP / L, where c is a constant which is the same for all the pipes in our example because they are all the same radius.Double the length of the pipe and you halve the flow rate. Double the head and you double the flow rate.So now for instance, can L fill at any flow rate?Its outlet is a very long pipe. Even if L is nearly full of water ,the head of water in F will mean the difference in heads between L and F is quite small even if F is nearly full and L is likewise.Its inlet is a much shorter pipe. Whether L can fill will depend on whether we can get J to have a high head to increase the flow rate of L's inlet pipe to more than that of its outlet pipe. But, at least at first sight, it would seem that such a high flow rate could mean that one of the other tanks earlier in the chain could fill firstSo - it’s quite a finely balanced question, and hard to answer.A obviously can fill first with a very fast flow rate, just fill it faster than it can empty.Well we can actually try this out with a real world experiment :).Well we can actually try this out with a real world experiment :).Prozix has made a 3D printed version of the puzzle. If you have a 3D printer you can download it here and print it out and test it yourself: Answer to the question Which one fill First / water equisystem by prozixI don’t have a 3D printer but he has uploaded some videos.First this is what happens with a slow flow rateNote that at 22 seconds in, J nearly fills briefly.If you look closely, you see that a bubble forms in the outlet from J to L, which makes sense, it’s a downward pipe and air is buoyant. The bubble then gets pushed out into L and then bursts.This shows the bubble just before it bursts (you can show the video at 1080p from the Settings)So - if the pipes are very thin - or the flow is just right - that might lead to J filling right there, if you can arrange it to fill before the bubble disperses.So even at a slow rate we have something anomalous already, though its because of a bubble.But what happens at faster flow rates? I asked in a comment to the video, and Prozix was interested and answered with a new videoAt 28 seconds in, at one of the flow rates, then L and F fill at the same time.Here, it all makes sense up to J. J can’t fill (apart from that possibility due to the bubble) at this stage because the pipe from C to J has only a tiny head above its inlet. It’s outlet is about twice as long as its inlet, perhaps more.Aside: If C was nearly full, J would start to fill, and if we could have the level of water stay below the outlet into L while J fills, then C with its shorter pipe could continue to fill J even when it is nearly full. But as it is now, there is no chance of J filling.So that makes sense. But how can F fill at the same time as L? That's more mysterious.The pipe from L to F is three times the length of the pipe from J to L. Meanwhile, in the situation shown here, the head from J to L is about double the head from L to F.So by the Hagen Pousseville equation again, the flow rate from L to F should be about two thirds of the flow rate from J to L in this situation where J is half full and both L and F are almost full.So you expect L to fill faster than F.So, I don’t think they can get into this situation at all, with a steady flow into L. There must be something going on that doesn’t fit our assumptions of laminar flow, or something else such as a bubble forming.Let’s look at what lead up to this. If you look at the video, L fills faster than F to start with, keeping nearly the same head from L to F as from J to L.L is clearly filling faster than F and is on track to beat it. There is no sign of any bubbles in the inlet to L.But then a little while later you get this (25 seconds in)Now F is filling faster than J. Something has happened to reduce the flow rate into L, which then permits the two levels between L and F to equalize.But the head going into L hasn’t changed. Also the input pipe to L is full and there are no bubbles. I think the only possible answer is turbulence.You can see waves forming in J so maybe that means there’s a bit of turbulence impeding the flow from J to L, especially since the water level for J is exactly at the level for the outlet to L. What are your thoughts?This is what happened with a moderately fast flow rate:Here is the video starting at that point.All of A, B, C, J, L and F are just about full. B, L and F started to overflow first and I think L just about beat the other two though it was almost simultaneous. In this frame you can see L just about to overflow and the other two though they have the water raised above the level of the top, haven’t yet actually started to flow down the side.So how do we understand that as a possible state in terms of the flow rates? Back to our diagram againWith A, B, C, J, L and F all filled, then A to B to C to J all have the same length of pipe and same head (height difference of the water in the tanks above inlet and outlet) so have the same flow rate. J to L has around 2.5 times the head of C to J, and the pipe is around 2.5 times the length, so the flow out of J is about the same as the flow into it, and the difference in head between the top of J and the outlet to I is small. From L to F, the difference in head is about the same as for C to J (which we already know is about the same as the flow from J to L) but the pipe is far longer, so L shouldn’t be able to empty as fast as it fills, and the water flows out of J faster than it flows out of L, so L should fill before J.From L to F, the difference in head is about the same as for C to J but the pipe is far longer, so L shouldn’t be able to empty as fast as it fills, so it should fill long before J fills,So if the flow rate is high enough for J to fill like this, L should fill before J and F doesn’t get a look in.So how could it happen? Well it could be the bubble from J to L, slows down the flow out of J so that J fills first before L.As for F filling, how did that happen? Let’s look at it again:The head from J to L is far higher than from L to F and the pipe is shorter, so the flow into L should be a lot more than the flow out of L to F. So it seems impossible for F to fill like this. It's not the bubble - the two tanks fill up reasonably steadily at the same rate. You can watch the video at quarter speed to check. Click the Settings icon in the lower-right corner, then click the Speed selector.Perhaps at this flow rate, its the double kink in the pipe from J to L causing more turbulence and so slowing down the input to L? What do you think? That could also help explain why J fills at this flow rate, if the pipe from J to L, has a slower flow rate than you’d expect from its length and head. What do you think? Do say in the comments.Even K can fill, though it is pretty hard to do. This is with a very strong flow into A, and several of the others have been overflowing for some time. They have turned off the inlet pipe at this point.Amusingly, in the real world, E ends up half full too after some time of running it at a high flow rate with the water overflowing from A.Here is the complete videoSo far the only confirmed alternatives to F are A (obviously) and L (pretty sure it wins at the moderate flow rate).That’s just a start. There are many other things to tryVarying flow rate. Can you get, J, say, to fill first or even K by turning the flow rate up and down at critical points during the filling process? This could cause bubbles to form, as well as adjust the heads of the various tanks.What happens if you scale the whole model up, or scale it down to a very small size? Scaling it down could make the flow rates out of some of the pipes very slow. It could also mean that bubbles like the one from J to L take a long time to disperse too. Scaling up could lead to more possibility of turbulent flow through the pipes.Try adding sugar for viscosityWhat if it is really hot, and you use a slow flow rate so that the water evaporates quickly?What if it is really cold so that the water freezes? That would seem to be a way to fill even B first, if the water freezes by the time it gets to B to C but remains unfrozen as far as the flow from A to B.NOTEIf you see anything in this to correct, however small or important it is, please either suggest an edit for my answer or say in a comment. Thanks!
How do water well pressure tanks work?
There’s a flexible gastight membrane inside with a gas charge on one side, the water goes into the other side, the membrane splits the tank into two compartments. As the tank pressurises the gas compresses and the membrane stretches to allow the tank to fill with water until the compression limit is reached. When the pump switches off the compressed gas (usually air) keeps the pressure in the tank high. As water is discharged the pressure reduces until a pressure sensor starts the pump again and restarts the cycle.This arrangement is used to prevent the pump from short-cycling and to even out the pressure in the fed main.
When will we run out of water?
The problem isn't the total amount of water on the Earth, the problem is the percentage of fresh to salt water. Almost 75% of the Earth's surface is covered with water, but less than 5% of it is fresh water.If we, as a species, keep breeding like rabbits, fresh water supply will become a definite issue. California has experienced a drought that is crippling it's economy, and has started plans to desalinize ocean water. At that point, it's not going to be cheap to have fresh water available. Pumping water out of a lake or reservoir  for close to free is a reality that may soon cease to exist. The day of having a toilet that takes 20 liters a flush is rapidly fading for a large percentage of humanity. The infrastructure to make fresh water out of salt water costs billions and takes years to create.
What are the best ways to think of ideas for a startup?
I see hundreds of startup pitches every year. I am constantly evaluating companies, new incumbents and my competition. I live and breathe the art of business, and if there’s one thing I see emerging, it’s that convenience is king.In a marketplace of distraction, the company’s, products and services that can save you TIME, are going to win. That is why Amazon is a market leader. That is why Prime Now wins. They have simplified the process of buying and selling. They have saved you enormous amounts of time.This is important because it’s the one commodity you can’t get more of. No matter where you are or what your economic situation is, you will never have more time. It’s why we as humans will do anything to purchase it. It’s why we choose the $24 Uber instead of walking. It’s why we pay $7 extra for delivery. It’s why we pay $500 to fly instead of drive. It’s all about time.No one wants complexity layered upon their daily life. No one cares about specifications and numbers and horsepower anymore. People literally want cars to drive themselves!! They want freedom and simplicity and SPEED.It’s one of the biggest market advantages you can possibly create. Uber saves you TIME. Amazon saves you TIME. GrubHub and Seamless and Doordash save you TIME. It’s why they’ve won.So when running your startup, you should be considering how you can save people time. How does your product, your business, or you service expedite a market experience that used to be tedious and tiresome for all? If you are trying to create a competitive advantage, you should really start thinking about SPEED and CONVENIENCE as the two things that will help you succeed.If you can do this, and execute, you are going to have a good chance.More importantly, make sure the end consumer perceives that additional convenience or speed you provide. Too many people focus on shipping a technical iteration or adding features to a product that only complicates the experience.Here is a video where I talk more about how startups succeed:Hope this helps!!If you liked this answer, say hi on:INSTAGRAM | TWITTER | FACEBOOK | SNAPCHAT | ITUNES
What is causing my window well to fill with water?
Rain? water table height? pressure from underground forcing water up? IDK how it’s filling, from the downspout being in a bad spot? Do you live near the ocean? High tide can do that as well as a full moon if in fact it’s being caused by underground pressure. You may know the water table is constantly on the rise so if it’s a new condition it may be caused by the increased water table height.
How long would it take to fill a 15000 gallon pool while using standard residential water spout pressure?
How long would it take to fill a 15,000 gallon pool while using a standard water spout pressure? To begin with, there usually isn’t a standard water spout pressure, or water pressure on a community water system supply system. If you live at the lowest point on the system and have enough capacity on the main to handle demand, you will have more pressure than a home at a higher, or the highest elevation. Ideal water pressure might be between 40 and 60 pounds, and you could use that number for a baseline you would still need to factor in the hose and hose bib size. A 1/2 inch hose bib has a much lower flow rate than a 3/4 inch hose bib, and likewise, a 3/4 inch water hose on a 3/4 inch hose bib has more flow than a 1/2 inch hose on the same bib.Now, if you want an example, our above ground pool is 9,000 gallons, and we ran a 5/8 inch hose off of a 3/4 inch bib, and filled it in 9 hours, so we averaged about 1,000 gallons per hour. If your pressure and supply is similar, you might be looking at 15 hours, give or take. Two things can drastically alter the time or rate of flow. A longer hose has a much lower flow rate than a short one (ours was 25 ft), and if the service pipe to your home is small, or if it has a pressure reducing backflow preventer, your rate of fill is going to be slower.
Does the pressure in a sealed water bottle completely filled with water and placed in the Mariana trench change to the pressure outside of it?
The water inside would be at almost the same pressure as the water outside. The difference in pressure would be due to the residual stresses in the bottle that are resisting being deformed. If it was a very thick-walled vessel similar to a vacuum chamber, then there could be a substantial pressure difference. If the bottle were like a balloon, then there would be essentially no pressure difference. If the bottle were a relatively thin-walled metal cylinder (with some kind of endcaps), it would deform into an oval shape instead of remaining cylindrical. This is a form of buckling. So it would be the bending stiffness that would determine the pressure difference rather than a hoop stress in the wall that you would calculate if you assumed the cylinder remained circular. So the pressure difference would be much smaller than you might calculate if you made the assumption that it deformed and remained a circular cylinder.
What kind of valve can bleed water out of a high pressure air chamber and let air bubbles in to avoid water filling in in the high pressure air chamber?
A high pressure air chamber is easily filled by a higher pressure air pump attached to a valve at the highest point of the chamber. Excess water would either go out the way it came in, or as for common compressor pressure tanks, a simple bleed valve at the bottom lets the water out. Close it when it discharges air.For air, a simple spring plug valve similar to those of car tires are common. For the water discharge, again a plug valve with screw in movement is common. Those are what came installed on our water pressure tanks and compressors.For bigger industrial applications, bigger and more robust valves would be used, with common automation sensors and actuators.
Has anyone tried scuba diving without swimming skills? Is it safe? Can you share the video or describe the whole experience in detail right from diving into water to how to come up?
In the PADI certification process, you’re required to swim 200 metres/yards (or 300 metres/yards in mask, fins and snorkel). There is no time limit‡ you just have to swim that distance without standing up either on the bottom or shore.There is a good reason for this. While your BCD is an effective life vest / flotation device, your BCD may have failed, and may be pulling you down due to the weight of the tank. You need to be confident treading water while signaling to the boat for help, or swimming the short distance to the boat.If you can’t swim, then it’s likely that you’ll become a Panicked Diver, and no one wants that. Diving is an incredibly safe sport, providing you don’t panic.The Typical DiveIn a typical dive, you gear up, checking all of the systems to ensure that everything is operational. You put on your fins, strap on your Buoyancy Compensator Device (BCD), which includes a harness for your tank, wear lead weights to help you sink,¹ fully inflate your BCD, put on your fins,² and then your mask. After checking everything one more time, you then either ‘giant stride‡ forward or roll backwards into the water.You hit the water with a splash, but soon pop back up to the surface, because you inflated your BCD. You make sure everything still looks good, and make sure the rest of your group is okay. You may swim a short distance to the front of the boat or wherever you agreed to descend from.Once everyone agrees that they’re ready to descent (done with hand signals, as is most communication underwater), everyone deflates their BCD. If you’re weighted properly, you descend so that your eyes are level with the surface of the water. Most divers then will kick downwards a little to get below the surface, at which point the water pressure starts to compress their wet suit or the remaining air in the BCD, making them less buoyant.You gently float downwards, usually stopping somewhere between 10–30m depending on the dive plan that you agreed to with your buddy or group. As you descent you gently add air to the BCD to compensate for the loss in buoyancy as you descend.Most dive plans have you start at the deepest point and gradually move upwards,³ so this is likely what you’ll do. Once you reach the ‘bottom‡ of your dive, which may either be the physical bottom or a depth that your dive plan considers your max depth, you adjust your buoyancy by releasing or adding small amounts of air to your BCD until you’re neutrally buoyant. (That means that if you stop moving in open water, you don’t tend to either float up or sink.)From there you gently fin along enjoying the underwater world. You never know what you may see. One dive I had 9 rays circling me for 20 minutes. They were beautiful. On another dive halfway around the world, I saw octopus couples getting down and dirty with one another everywhere. It was very hot, in a tentacle-porn kind of way. In Monterey, California I stumbled upon two ghost-white crabs, each 5′ across from leg tip to leg tip. I almost always see something fascinating or wonderful on a dive.When you reach the end of your dive, your air runs low, or you decide to come up for some other reason. At that point you very slowly swim towards the surface, stopping at approximately 5 meters depth for 3 minutes as a ‘safety stop’.⁴ Once you’ve completed your safety stop, you can gently ascend to the surface, celebrating another amazing dive.You swim to shore, or the dive boat picks you up. You clean your gear, dry off, and you can’t stop smiling.PADI SkillsThis video playlist goes over the major skills that you’ll learn in your Open Water Diver course. Once you’re certified,⁵ you’re a diver for life, though if you don’t dive for over a year, a short (½ day) refresher course is recommended.I ❤️ Footnotes¹ The amount of lead weight that you carry depends on several factors, including your body weight and the type of exposure suit (wetsuit) that you're using. Your certification course will teach you how to calculate how much weight you will likely require, and how to check and correct your weights.² Never call them 'flippers'. They’re fins. Flipper was a cetacean TV star.³ There are good reasons for this, involving the accumulation of CO2 in your blood stream, and you'll learn that in your Open Water course.⁴ Again, you'll learn why in your certification course.⁵ Please don't try to 'take a shortcut' and dive without being certified. Your life is on the line, and an Open Water course is only three days long. The course will make you a more skilled and more aware diver. See “Is it okay to SCUBA dive without certification?”