Applications
This principle has been applied for over one hundred years; counts of this class have a proven track record in many different industries. The volumetric meters are commonly used in flow counts, for example, as a basis for billing volumes supplied from pipe networks or transferred into containers.
Consequently, the range of models available is vast and varied, and includes many that are suitable for Custody Transfer applications. The field of applications for these volumetric meters is correspondingly broad. From end to end, its use ranging from gases to high viscosity fluidized bitumen:
- In the petrochemical industry, tankers (crude, etc..) Counters heating oil in tanker trucks, etc..
- Accountants in fuel pumps at gas stations.
- Counters transfer (control) in calibration systems.
- Gas meters for domestic applications and systems.
In these areas normally requires a measurement accuracy of up to 0.1% v.1., A requirement that only Coriolis meter in addition to the volumetric, are capable of achieving. The significant advantages of Coriolis flowmeters respect to volumetric meters are that the early lack of moving parts in the measuring tube and allow the supply in terms of temperature fluctuations.
For the dairy and food industries other models are available that allow easy disassembly for cleaning without losing calibration accuracy. Volumetric flowmeters can be installed in any position, although usually arranged in horizontal pipes.
Frequently Asked Questions
How does the temperature of the fluid to the implementation of the PD meter?
In a PD meter can produce several effects. For example, a change in temperature can cause changes in fluid volume, which have a direct effect on the value of reading. A change in fluid temperature also increases or decreases the temperature of the counter and can alter the sizes of some key mechanical parts or the width of the interstitial spaces. Under the counter model, these effects are offset or reinforce each other.
Variations in temperature can affect the size of the meter body, but not significantly alter the temperature of the fluid. For a more precise execution, and the temperature should remain constant process where possible. If changes in seasonal temperatures or temperature process, it should inform the dealer so that we can provide the correct materials and appropriate models.
How often PD meters must be calibrated?
Depends on the application and the country in which the counter is used PD. The legal requirements or standard rules determine the frequency of calibration. Counters for flow counting applications (Custody Transfer applications) is calibrated as a general rule once a week or once a month, depending on the type of fluid. Often part of a system dedicated to the measurement with integrated check items.
The counters in other industrial applications should be calibrated at least once a year. It is important to pay special attention to the sliding surfaces and conditions of the pivots and bushings. If the pins are too worn slides can be produced fluid.
Do the PD meters are sensitive to the touch?
The significant and frequent pulses affect the majority of PD meters. The rotor is subject to withstand impact loading, and the stresses they are transmitted to the pins and other mechanical components. This wear can affect the operational life of the counter.
Is it difficult to estimate the measures must have a PD meter?
It is important to know the minimum and maximum flow rates and viscosity of the fluid being measured. Most manufacturers provide tables of measures or programs that are based on viscosities close to unity, since the majority of PD meters are calibrated with low viscosity oils or water. These tables are functions of fluid velocity and viscosity and provide the resulting calibration curve. The size of the counters are usually count for a maximum input speed of about 2 m / s. This rate decreases with increasing viscosity above 200 cP. The distributor of the equipment usually have expertise in the selection of sizes for the counter.
How does the sediment in the interior of a PD meter?
Sedimentation of two modes can affect the execution of the counter. First, small particles can become trapped in the interstices and cause buildup and wear, thereby increasing leaks on the counter. Moreover, the particles can infiltrate the Kingpin and increase friction, thereby reducing the value field measurement device. Sedimentation, therefore, causes two types of biased behavior, loss of field measured values and worsening of repeatability.
