Tag Archives: pressure sensing

The Pressure for Safety in Gas Stations

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

The Pressure for Safety in Gas Stations

For safe fuel storage and delivery, frequent maintenance and monitoring of the equipment in gasoline stations is certainly advised and may be required by federal and/or local legislation. In addition to the hazards presented by leaks, they are also costly to the service station operation. In all instances, to prevent or detect problems, pressure measurements are essential.

For example, static pressure testing for fuel lines and gas stations requires a pressure gauge to ensure that everything is working properly and not leaking.  Test equipment to verify this performance can range from sophisticated and expensive to straightforward and cheap.

Gas Station Fuel Gauge

The 50 psi (345 kpa) static pressure reading. Note fuel in the gauge.

Stage II Vapor Recovery Control

For many years, Stage II Vapor Recovery Control in gas stations (aka gasoline dispensing facilities or GDFs) was required by many regions in the U.S. To quantify the vapor tightness of vapor recovery systems installed at GDFs equipped with pressure/vacuum (P/V) valves, the designed pressure setting of the P/V valves has to be a minimum of 2.5 inches of water column (inches H2O) to verify the 2-inch water closet (WC) static pressure performance of the system.

However, since the early 2000s, many vehicles have been equipped with onboard refueling vapor recovery (ORVR) systems. These ORVR controls have essentially eliminated the need for Stage II vapor recovery systems in service stations.

Comments/Questions?
Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com

The Pressures of a Modern Lifestyle

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

The Pressures of a Modern Lifestyle

After a restful night’s sleep, possibly in a water (<<28 mmHg) bed or on an air (<1 psi) mattress, the day begins with the flushing of a toilet, washing of hands and a relaxing shower. All these daily routines need adequate water pressure (40 to 45 psi). More water pressure is needed to get the filtered water (20-40 psi) for coffee. In many cases, the coffee is made by a pressurized (130.5 ± 14.5 psi) coffee/expresso machine. Before leaving home, a pressurized (10-100 psi) water-powered toothbrush could be used to clean the teeth.

The trip to work or wherever in a personal vehicle would almost always require riding on pressurized rubber tires whether it is a car, truck, motorcycle or even a bicycle (< 135 psi). If the vehicle is a car with an internal combustion engine, cylinder pressure provides the power to propel it and, in some cases, a turbocharger provides even more input air pressure. Hydraulic pressure provides the braking (800-2000 psi) and steering (80-125 psi).

Back at home after whatever the day has meant, it is cool thanks to the air conditioning compressor (<100 to >345 psi) and air delivery by the fan (1-in water column) through a clean air filter (<250 Pa). To relax, a pressurized bottle of liquid, perhaps a soda (30-50 psi), beer (<45 psi) or even sparkling wine (70-90 psi) is in order. With the stress of the day behind, your blood pressure (120/80 mmHg) and breathing (respiratory pressure) are probably the lowest they have been all day. Of course, the entire day occurred in atmospheric pressure whether it was near the ocean (14.7 psi) or in a mountain cabin at 1 mile above sea level (6.9 psi).

As another round of flushing, washing and brushing ends the day, the typical person is unaware of the value pressure has meant to their day to increase comfort, convenience and safety as well as save time and provide essential well-being. If they wanted to measure, monitor or control any of these or many other pressures, All Sensors has the pressure sensors to do the job.

Comments/Questions?
Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com

Pressure Sensing in Drones

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll discuss the application of pressure sensing in drones.

Pressure Sensing in Drones

Aircraft of all sorts have different applications for pressure sensing. Drones in particular employ altimeters and barometers similar to even the most and least sophisticated aircraft. A basic surveillance drone can also use accelerometers, gyroscopes and magnetometers as well as cameras, temperature sensors and more.

The altimeter is an integral part of the altimeter control. While some drones have been developed and sold with ultrasonic sensors, pressure sensors improve the hovering mode of the most basic drones. With the altimeter, the air pressure in flight can be compared to the ground pressure for higher, safer operation of the drone.

Altimeters and barometers are mounted in protected internal compartments so their environment tolerance does not have to take into account external conditions that demand more rugged packaging. Recreational drones operating specifications fall well within the capabilities of commercial 100 kPa pressure sensors.

Other pressure sensor applications are found in other types of aircraft. For example, in light aircraft the simple form of an air speed indicator (ASI) measures the difference in pressure between the normal pressure around the craft and the increased pressure caused by propulsion. In more complex aircraft, pressure sensors can also monitor and help control the hydraulics, engine oil pressure and more.

With requests to expand the rules for drones from companies including Amazon, even the Federal Aviation Administration (FAA) is sensing drone pressure these days.

post13drones

What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Dan DeFalco, Marketing Manager, All Sensors Corporation (ddefalco@allsensors.com)

Pressure Sensors’ Role in Solving Drought Problems

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll discuss the importance of pressure sensors’ role in solving drought problems.

Pressure Sensors’ Role in Solving Drought Problems

Sensors play an essential role in preventing excessive water usage and reducing water consumption to minimize the impact of drought situations. Of course there are many actions to conserve water that users can implement that do not involve sensors, but sensors can:

  • Determine if crop irrigation is sufficient to prevent over watering – soil monitoring through rain, temperature, wind, moisture sensors and more.
  • Detect leaks to avoid unnecessary water usage.

Pressure determines the flow rate and consequently the amount of water that is consumed so reducing the water pressure is a common conservation recommendation. Pressure regulators have a built-in pressure sensing mechanism.

Leak Detection

A common technique to determine if a system has leaks has three steps: pressurize the system, isolate the system from the pressure source and then measure the pressure to determine if a pressure drop occurs within a given amount of time. For residential and commercial water users, this would mean adding a pressure sensor to a system that already can measure unnecessary flow.

The utility’s water meter can identify water consumption with its low-flow indicator. Water flow when all water usage is turned off indicates leaking faucets, toilets, irrigation valves or even leaky pipes. Some estimates blame undetected water leaks for 5 to 15% of a private residence’s water consumption.

With today’s wireless technology and sophisticated computing capabilities, pressure sensing could become a tool for utilities to monitor their distribution networks to detect and identify the location of leaks before they become obvious geysers and floods. Researchers in Barcelona, Spain have been investigating this distributed pressure sensing approach for several years.  Using the proper number of appropriately placed pressure sensors in the distribution network generates a leakage signature that allows leakage localization. The leakage detection procedure compares real pressure and flow data with estimates using a simulation of the mathematical network model.  Genetic Algorithms allow the system to generate solutions to leakage problems in a much shorter timeframe than existing approaches.

With water conservation becoming more and more of an issue, both users and suppliers need to take the appropriate steps to ensure future availability. Pressure sensors could be a major part of the solution.

What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Dan DeFalco, Marketing Manager, All Sensors Corporation (ddefalco@allsensors.com)