There is no reason to open the nozzle up all the way all the time, us it like a throttle. As a quick example lets say a 200 GPM smooth bore is on one side and a 200 PSI low pressure automatic is on the other and 300 GPM is all that is available. High pressure gives greater reach which is needed outside and low pressure gives lower nozzle reaction (for the same flow) for interior where reach is far less of an issue. Choose a flow and then look up the pressure loss per hundred on a flow chart. Let me try to put a short version here. We make a "wand" style that attaches to our Pro Pak foam unit. Bob Steingass, Answer:  The reason that the Bubble Cup nozzle is not approved is that it does not pass the drop test of NFPA, it has nothing to do with the pressure. opposite line as that nozzle opens to accept the flow. Answer:  It can but it must be done with clear understanding of what will happen. Answer:  The easy answer first. Pouring the liquid faster, usually results in the water landing in the glass, rather than running down the side. Answer:  Yes BIC connectors (the male side) are available for all TFT nozzles. Fortunately this is not as tough as shoe tying. That is a very poor test as it is Answer:  The short answer is NO but that is not a complete answer. Thats the nozzle part, the tactics of when to use a straight stream and when to use a fog are yet another FAQ. It is far more than the smooth bore versus fog issues. Combination straight stream and solid stream nozzles have been made in Europe for over 100 years. Although it is fairly obvious how we beat the water back on itself, to fill the pattern, it is not as obvious how we fill the tooth gaps. Answer:  Many of the nozzles that TFT offers (Not all) have been tested to NFPA 1901. Examples of proper use of the full fog: . Cable entry 16. The purpose is to move the blood out * * NOTE: If disabled, EEPROM operations can also be accessed in the (settings > machine > parameters) menu. Hopefully your book will help them make GOOD choices. (take the. In some cases, none of the above may be adequate. Answer:  There is not a specific manual to this nozzle as it is a very basic design. Parameter setting: parameters can be modified and stored in internal FLASH memory and cannot be lost even in case of power outage; most of them can be adjusted using front panel of the controller and all of them can be modified using PC via USB port. An automatic nozzle by definition maintains a nearly constant 100 psi (or whatever pressure it is designed for, lets assume that this one is 100psi), The normal formula for flow is EP = FL + NP. The main feature of most TFT nozzles is the slide valve. High pressure setting spindle, (HP) 7. LTPS-TFT pixel circuit compensating for TFT threshold voltage shift and IR-drop on the power line for AMOLED displays.pdf Available via license: CC BY 3.0 Content may be subject to copyright. Answer:  No problem on that one! In the example shown in Figure 3, the first relief valve is set at the MAWP of the vessel (100-psig), the second relief valve is set at 103-psig, and the third relief valve is set at 105% of the MAWP of the vessel. If your willing to run the higher pump pressure (applause applause) then by all means put it in 100 PSI and leave it there unless there is an emergency like a pump failure. Of course the downside is that with lower pressure the stream will not reach as far nor hit as hard and the fog pattern is degraded from optimum. It has a high and a low mode. where P is nozzle pressure in psi That is EXACTLY what is going on when you pump at a high pump pressure and allow the NOZZLEMAN to control the flow. 11. This exclusive TFT feature provides you with the unique ability to change operating nozzle pressure depending on the situation, thereby allowing maximum flow at a lower nozzle pressure. The slower the speed the less impact that the stream will have and the shorter the distance it will travel. Adjust the differential pressure accordingly. The nozzle pressure is nearly constant at 100 in standard mode so the flow is equal to the pump pressure minus 100 and then that flow is looked up on a friction loss chart for the size hose being used. 32 Mandibular repositioning device ... Compendium of innovative health technologies for low-resource settings 2011-2013 viii Technologies by health topic Assistive devices for hearing and vision Unlike the smoothbore when the automatic nozzle is throttled back it will immediately resize itself to take the new flow at correct pressure so that its reach and action are not changed significantly. Answer:  Typically it just means that it has large D shaped handles so that more than one person can get a hold of the line. Answer:  The first step is to get the 2 inch down to 1.5 NST, once you have it there it is a simple matter to obtain a 1.5 by dual 1.5 wye or a 1.5 by dual 1 inch wye. When nozzles are evaluated it is frequently done in a As you then turn left the nozzle will turn on and flow a straight stream in the 20 gpm setting, as you crank the shaper further to the left you will note a transition point where the stream jumps into a semi fog and then goes back to straight stream, that is the 60 gpm setting, turning it further will send it into fog pattern. 2) backup 3) footing 4)height above ground 5) grip or no grip 6) training. As nozzle pressures go down the stream VELOCITY or SPEED goes down. Two thoughts come to mind. So a quick estimation would be the nozzle moves about 130,000 CFM. Record the pump pressure and then put the auto on that is set to 80 and when the pump is brought up to the same discharge pressure and the nozzle is at 80 THEN you will have apples 2 apples and they will flow the same. When the pump-loading valve is shifted, the system pressure drops to the much lower load-sensing valve setting. Answer:  The highest reaction is when the nozzle is in straight stream and all of these forces are in reference to a flow and pressure in a straight stream. To force fresh air to victims P-low P-low is the deflation pressure (or PEEP). Q is Flow through the nozzle in gallons per minute (PDP 150psi 1 3/4" - 125 gpm 2" - 180gpm)(PDP 175psi 1 3/4" - 160gpm 2" - 205gpm)(PDP 200psi 1 3/4" - 180gpm 2" - 235gpm) You can see by the comparison that 2" line though somewhat heavier than most 1 3/4" lines does offer quite a bit more flow at the same engine pressure. 170 GPM, nozzle pressure of 55 psi, friction loss is 45 psi. First the issue of flow and high pump pressures and what we are advocating. automatic will choke off and try and make the pressure build. Rather it must be a ball valve. It becomes a 50 GPM at 100 PSI fixed gallonage nozzle. The combination fog/straight stream nozzle can be used when wetter, faster draining CAFS foam is desired, and for most of the day to day uses with water, foam or CAFS. If anything is wrong we get an under pressured or over pressured stream. In this way the rider can for example read the tyre pressure settings at the front and rear very simply without being distracted from the traffic situation. Secondly, your question about nozzle pressure is simply answered. 3. I can see why you might want to do that and it is doable. To clear smoke from an enclosed space Lets take number two first. same pumper and the total flow available to the pump is 200 GPM (Imagine for example we are off the tank Click on this link to view the manual. Had they Firefigthers found themself getting backed out, to "fix" the problem they tried smooth bores. To increase the cut-off and cut-on pressure, turn the nut clockwise . You are right that if the nozzle pressure is lower it is going to flow more water at all pump pressures than will a nozzle that has a nozzle pressure. The switch also requires more training in that people need to know it is there and when to use it. We have had several customers (power plants) do their own testing and they are currently using our products in this application. Aiming at people A look in the yellow pages might find a contractor near you that can help. As an automatic nozzle, the Handline throughout it rated flow of 50-350gpm operates at 100psi + - 15%. This whole low pressure thing got started because of people wanting to lower pump pressure for some unknown reason thinking that it would make the line easier to handle. The time factor is controlled by emotion, tradition, and availability of facts that people can see feel and understand. By lowering the nozzle pressure by approximately 50PSI that amount of pressure becomes available for friction loss in the hose which means that for any pump pressure the low pressure setting will give a higher flow at a lower nozzle reaction. NR is Nozzle Reaction in pounds Answer:  K factor is another way to express the flow and pressure capabilities of the nozzle. If any part of your equipment is making you uncomfortable, you run the risk of your therapy being less effective, and you may not use your CPAP as prescribed by your sleep doctor. Answer:  The simple answer is that we wouldn't. If you can't get pressure or you want to deliver lots of water with a lower reaction then switch to low pressure. The pump pressure required is going to be ENTIRELY dependent on the flow YOU want to deliver. Just looking at it, you can't see it with your own eyes. This testing is available on request... Answer:  The goal is to maintain accurate EXIT velocity which means maintaining the nozzle pressure at 100 PSI at the exit. We will soon be posting a document in our library that explains how to field test automatic nozzles. At the nozzle the nozzleman can use the valve to then adjust to whatever flow is needed for the situation. The intent of the detents was to indicate to the firefighter that its "OK" to open the valve part way. automatic nozzles the choices are either full on or full off for the It is what we have tested the most and reccomend. The market for this type of nozzle is so small and the conditions so widely varied that we have never found it worth while to do this testing and offer a product that is certified. Answer:  No specificly. 2017 Volkswagen Tiguan Reset Tyre Pressure Setting. TFT LCD is a variant of a liquid-crystal display (LCD) that uses thin-film-transistor (TFT) technology to improve image qualities such as addressability and contrast. A load-sensing valve usually is smaller than the compensator valve and typically mounted directly on top of the compensator. Answer:  In the case that you refer to you are quite accurate in that either one will put out the fire with suficient volume. This results in the 'finger' reconverging just an inch or so beyond the nozzle. I strongly urge the use of pistol grips, as CAFS has a much, much higher nozzle reaction than non-CAFS streams. Let me try and take a cut at this. SUBMIT IT Fog or straight stream the flow does not change. Up next in 8. However, with a twist of the knob on the front of the nozzle, you switch to the low pressure mode, which immediately reduces the nozzle's operating pressure to around 55 psi (3 bar) (45psi / 3bar for low pressure version). In the standard mode, the MID-FORCE nozzle maintains a 100 psi (7 bar) operating nozzle pressure (75psi / 5bar for low pressure version). Answer:  There really is no current info on the status of the debate. Since the smooth bores operate at a lower nozzle pressure all of a sudden the flows went back up because there was pressure left over for friction loss again. Answer:  There are no "standards" that we are aware of. Lets take an example. Liquid hydrocarbon fires are very hazardous, and unless you are prepared to make a serious attack, it is best to evacuate, and simply leave it until it burns out or other resources can be arranged. It is about four feet long, has an angled point and delivers 95 GPM at 100 PSI. With an automatic nozzle and a slide valve it is possible to throttle the Fireman have been taught for generations that the bail forward is off and the bail back is on. Differential setting spindle 3. Here are some of the links for these items. Again referring to your hose friction loss chart, this equals a flow rate of 200 GPM. On the opposite side there are times when the use of a straight stream can be a serious problem. Can it be used with a smooth bore the answer is a qualifed yes. If you press the Steam button again, you can adjust the mode from Normal to Less or More. Trying to describe it is darn near impossible. We recomend that each fire department establish SOP's for their hose and their pumpers by using a flow meter. If you were to retest these nozzles using flow first and then reading the pressure my bet is that you would find that they are all within plus or minus 15 psi of 100 which is within the NFPA standard. X amount of water rather than X + Y delivered un-safely and likely Task Force Tips (TFT) designs and manufactures thousands of fire nozzle, fire monitor, water and foam flow products to help firefighters risk less to do more. The flow you would get would be the same. Kind regards; Here is the problem. Again - I stress training. There are two reasons why we don't do this. THe nozzle pressure falls to approximately 20 psi which is ineffective for not only the fog but the straight stream as well. It has flow settings of 10 and 24 GPM which should work quite well on a one inch hose. With the nozzle in the standard (100 psi) setting the flow will be approximately 80 GPM with a nozzle pressure of about 87 psi (13 psi friction loss) Frequently people try and get far too accurate with nozzle pressures. Low Pressure nozzles are any nozzle that is designed or used at a pressure below 100 PSI. Want to see more? When the nozzle reaches its maximum rated flow, the pressure control unit is opening the baffle as far as it can, which then causes the nozzle to act similar to a fixed gallonage nozzle, and the discharge opening cannot become any larger. It will change your mind about what the real seat of the fire is and WHERE it is. The nozzle can be used as an 11.7 HP fan. Answer:  If someone kills somebody with a gun is it the guns fault or the persons fault. asked what they can hold comfortably. so much on the size of the firefighter although of course that is a factor. If a high speed photo is taken of the spinning tooth pattern, the gaps in the pattern become easily apparent. Iowa State, Oklahoma State, Texas A & M all have circulars and books that cover the wide range of conditions that must be examinned to determine this flow rate. All you have to do is set the pressure to deliver the maximum flow that you want for the line and then leave it alone. I am sure that you have heard the old saying "You can't fight city hall" Yes we make smooth bore nozzles because there are some people that no matter what believe that they are better. There are all kinds of tools on the fireground that used incorrectly will hurt people. Another way to think of it is like All TFT in line gage adapters have this feature. In a movie, the film is made up of many individual pictures, or frames. Recently we introduced a complete line of color coded pistol grips but those only fit nozzles that have been manufactured since January of 2000. of the flow will go to the manual nozzle until the pump pressure exceeds the automatic nozzles operating The hose you are using may have different friction loss characteristics, but these flows should be in the ball park. All we know is that this was their intent. Had they simple brought the throttle up on that expensive fire truck that was bought to PUMP WATER they would have not only delivered that flow they would have also delivered it farther, with more impact, with more stream action, than a 50 PSI nozzle. This is called the Coanda Effect named after of course, a Dr. Coanda who studied the affects of surface tension of water. If you’ve noticed that your submersible well pump is kicking on and off with increased frequency, or that you’re struggling to get water out of your tank, it’s likely you are experiencing problems with your well tank’s pressure charge. Letting the water flow causes friction loss which eats up the extra pressure leaving 100 PSI (or 50) at the nozzle. Info. It is commonly done that way because pressure is easier to read and set and then when the flow settles down we write that number down. The reason that does not work however is because we expect more out of a nozzle. The baffle of the nozzle is equipped with a low-pressure override knob, which allows the nozzle to achieve even greater flows at lower nozzle pressures. Therefore, the water, although it varies in volume, is almost always exiting the nozzle at a constant velocity Because the velocity varies little, TFT Engineers were able to match a CURVE to the tooth which matches the velocity and therefore the water leaving the nozzle FOLLOWS THE CURVE OF THE TOOTH!! So now we have 25 psi of friction loss per one hundred feet of hose. Think of the nozzle as a screen door with a spring. If the calculations are right and the pump pressure is right and the nozzleman has it set to the right setting we get the flow we expect. Divide by 1.5 and we get the loss per 100 feet, or 66 psi. The short answer to your question would be "Determine what flow you want to start with, figure the friction loss for the hose length that you use either by using charts or by experiment, add the pressure that you come up with to 100 PSI and that is the pump pressure", Answer:  NFPA does not make recomendations on this that we are aware of. A fire fighting stream is a CHOICE between flow and pressure. nozzle. This is directly corresponding to the flow and pressure specifications called out in the NFPA 1964 Standard (1998 edition)on hand held nozzles. You can perform actual tests on your hose and calculate the numbers. Your question about adjusting the flow on a selectable is a whole bok in itself. Therefore, we eliminate the one variable in the equation that we did not know before. be shared and balanced always maintaining proper nozzle pressures. If the fire is bigger it is wrong, if the fire is smaller it is again wrong. {{product.Attributes.EventThumbnailAltText}}, {{product.Attributes.NewsThumbnailAltText}}. Answer:  The question has to be clarfied somewhat to be answered. They are normally used to electrically cycle a compressor on and off; however, when and why they do so will vary based on the design of the system. Clearly that is not practical for the fireground. The manual nozzle will start taking water immediately and the It will APPEAR that the smooth bore is the "better" nozzle but that is only because it is selfish and takes its water away from the automatic. We would suggest that you talk to your truck manufacturer for reccomendations. The lower the psi, the lower the temperature. If you have a standard preconnect however and a standard pump pressure you can test the nozzle with a flow meter and determine what each click gives you and then set that as part of your Standard operating procedures. Now it becomes a much more simpler question. With a twist of the knob on the front of the nozzle, you can switch the DUAL-FORCE to the low-pressure mode, which immediately reduces the nozzle's operating pressure to around 55 psi /4 bar (approximately 45psi / 3 bar in low pressure version).
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