When minimal fluctuations in pressure and flow are critical factors which of the following pressure-reducing valves would be the best choice?
RT 151 test #1
| Question | Answer |
|---|---|
| When minimal fluctuations in pressure and flow are critical factors, what pressure-reducing valves would be the best choice | multiple-stage pressure-reducing valve |
| What are the primary organ systems affected by 02 toxcity | central nervous system and lungs |
What device is used to reduce the pressure and control the flow of a compressed gas?
Regulators
Regulators. Pressure regulators reduce the high pressures of the stored gas in the cylinder to lower pressures that can be safely used in an operating system. Proper regulator selection is critical for both safety and effectiveness of operating systems.
How are flow restrictors classified?
How is a flow restrictor classified? A fixed orifice, constant pressure flow meter device. What is the function of a regulator? Function of a reducing valve?
When used to control the flow of medical gases to a patient how is a Thorpe tube classified?
Exam 1
| Question | Answer |
|---|---|
| Compressed gas cylinders are manufactured form of which of the following? | Seamless steel |
| When used to control the flow of medical gases to a patient, how is a Thorpe tube classified? | Variable orifice, constant pressure flowmetering device. |
When using a low flow oxygen system which of the following would cause increased fiO2?
Final
| Question | Answer |
|---|---|
| What following factors of flow increase fiO2 delivered by a low flow O2 system | Small Vt and minute ventilation |
| A physician orders 2L/min of O2 through a simple mask to a 65yr old with chronic hypercapnea. What would be the correct action at this time? |
What is the usual method of monitoring the remaining contents in a gas filled cylinder quizlet?
What is the usual method of monitoring the remaining contents in a gas-filled cylinder? Read the pressure gauge.
Why the flow of a compressed gas must be controlled for practical and safe use?
The flow of compressed gas must be controlled to control the amount and the rate at which gas is released. Without the regulator device, the gas would rush out of the tank with a force powerful enough to transform the tank into a dangerous, uncontrolled projectile.
What is a compensated flow meter?
Compensated flowmeters work with a variable orifice and fixed pressure. They read back pressure, and take into account resistance changes downstream from the needle valve. If pressure exceeds 50 psig downstream, flow ceases. The types can be distinguished by their response when gas starts to flow.
Is a Bourdon gauge compensated?
Compensated Thorpe tube flow meters are compensated for the back pressure which in the case of the bourdon gauge will cause inaccurate readings 2. The compensated Thorpe tube will read the accurate flow rate as restriction downstream from it rises.
What are the advantages of using a flow restrictor to control the delivery of medical gases to a patient?
Which of the following are advantages of a using a flow restrictor to control the delivery of medical gases to a patient?…
- to terminate O2 delivery to an area in case of fire.
- to allow selective maintenance without shutting the system down.
- to allow variable pressure reduction throughout the system.
What is the percentage of oxygen provided by connecting a high flow?
As such, the efficacy of treatment for the low-flow nasal cannula is limited. High-flow nasal cannula (HFNC) therapy is an oxygen supply system capable of delivering up to 100% humidified and heated oxygen at a flow rate of up to 60 liters per minute.
What should be the allowable pressure fluctuation ratio?
The allowable pressure fluctuation ratio, P′/P, within the surge drum is usually set at 1.05, representing a design effort for 5% pressure fluctuation from average system pressure. Values larger than this are seldom worth using, although an effort to reduce fluctuations to about 2–3% can be attempted by using P′/P at 1.02 or 1.03.
Which is better reducing flow or reducing pressure?
Intuition based on our common experience with nozzles would lead us to believe that the smaller nozzle would spray a greater distance. In fact, in most of our everyday experiences, the smaller nozzle will spray a greater distance, but, this is because of a restriction upstream which limits flow and pressure to the larger nozzle.
What is critical pressure ratio for compressible flow in nozzle?
Consider a Converging Diverging (CD) Nozzle with pressure P 1 at the throat and pressure P o at the inlet. Now, it can be observed that reducing P 1 promotes the flow of fluid from inlet to throat to outlet, at a rate which increases with pressure drop
What are the effects of fluctuations in pressure?
Having small fluctuations of pressure also means small fluctuations in flow concerning the cutting process. Less changes in pressure also result in a positve increase of life time of high pressure components such as tubings, fittings and cutting heads [2] [3].
How is pressure control and flow control achieved?
Gas pressure can mitigate sleep apnea. In each of these cases, fluid is controlled to achieve a particular outcome. The power delivered to these processes requires pressure control or flow control. How are pressure and flow control achieved?
Intuition based on our common experience with nozzles would lead us to believe that the smaller nozzle would spray a greater distance. In fact, in most of our everyday experiences, the smaller nozzle will spray a greater distance, but, this is because of a restriction upstream which limits flow and pressure to the larger nozzle.
What happens when the pressure of a pump is low?
A common assumption is that if the pressure is low, the pump must be bad. This is not the case. The pump doesn’t pump pressure. The pump delivers a rate of flow. The single function of the pump is to take fluid from one place and put it somewhere else. Pressure is the result of resistance to flow.
What happens when a valve is adjusted to the desired flow?
The valve is adjusted to the desired flow and all things are good UNTIL something changes. Let’s say that one or more of the spray nozzles becomes clogged.
