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Pressure
Instrumentation and Measurement
Theory
Absolute
Pressure
Gauge
Pressure
Vacuum
Pressure
Differential
Pressure
Static
Pressure
Units
Pressure Regulators - compliments of our sponsor GO
regulators
The following excellent articles are from our sponsor Emerson
Process Management.
Pressure
Best Practices - Plants are continuously
challenged to be more and more efficient - deliver more with less.
How can you reduce initial capital costs, improve plant quality,
throughput and availability, while decreasing operating costs?
Pressure Best Practices shows you how to use innovative technologies and
new field practices to increase your plant efficiency
Density
Measurement - Pressure and differential pressure
transmitters are often used to measure the density of a fluid. Both types
of transmitters measure level based on the principle that pressure (P) is
proportional to the level of the liquid multiplied by its specific
gravity.
Interface
Measurement - Differential pressure (DP)
transmitters are used to measure the interface of two fluids that have
different specific gravities (S). To make an interface measurement, the
overall level must be at or above the low pressure tap at all times. It is
important that the level be large enough to create a reasonable DP between
the two specific gravity extremes. This measurement can be done with or
without remote seals. However, from a maintenance standpoint, it may be
easier to use a remote seal assembly; keeping the wet leg at a constant
height can be difficult in some applications.
Eliminating
the Need for Methods of Additional Process Sealing -
According to installation code found in both NEC 501.5(f)(3) and API 14F,
process connected device installed in hazardous locations are required to
have dual process seals in order to prevent flammable or combustible
process fluids from entering the external electrical system - this
technical note discusses a solution for this.
Transmitter
Diagnostics Reduce Maintenance Costs - A
comprehensive article which discusses methods for reducing maintenance
costs.
Specify
the Right Solution for Vacuum Applications -
When a vessel is under a vacuum pressure, it is important to specify the
correct transmitter remote seal system to measure level accurately and
reliably. Failure to do so will result in output drift or complete system
failure. The combination of high process temperature and vacuum process
pressure conditions creates additional requirements when specifying the
transmitter remote seal system.
Safety Tip
Risks
associated with the use of Mercury
Pressure Conversions
Pressure
Conversions from ICEweb
Pressure
Unit Conversion - Look up conversion factors or
select a conversion table for a particular pressure unit
Pressure Measurement
Pressure
Measurement Glossary -Find an explanation here for
pressure measurement terms listed in alphabetical order- from SensorsOne
Pressure Instruments
Manometers
Equal
Column liquid Manometer
Inclined
Limb Manometer
Parallax
Error
Capillary
Effect
Pressure Gauges
Principal
of Operation - from hydraulicspneumatics.com
Pressure
Gauges - A useful article from OMEGA Engineering
Seven
Steps to Pressure-Gauge Selection -Many factors affect
proper gauge selection, and if you follow the seven-step process, the task
can become simpler and more exact - Thanks to IMPO
and Richard Jankura -Dresser Instrument.
3.10
Seven
Steps to Select
a Pressure Gauge - Covers
those important considerations required when selecting a pressure gauge -
from Ashcroft.
10.10
Pressure
Gauge Selection Strategy - 7 Key Considerations to Ensure Application Success
- Chikezie Nwaoha - In order to
maintain the efficiency of pressure gauges in general (bourdon tube, bellows,
helix, etc.), a thorough selection strategy should be employed. As such,
end-users would be wise to carefully consider pressure gauge selection, as
failure to select the correct pressure gauge for an application can result in
significant plant downtime. Further, in a worst-case scenario, an improperly
specified pressure gauge can fail to measure pressure during an overpressure
event, compromising plant safety and potentially resulting in costly damages. In
order to improve pressure gauge operating efficiency and service life, there are
seven basic selection criteria end-users should consider. Thanks to www.flowcontrolnetwork.com
Pressure
Gauge Selection - When selecting a pressure gauge
consideration should be given to a number of parameters which have an
effect on gauge accuracy, safety, and utility - from McDaniel Controls.
Pressure Regulators
- ICEweb's specific page of everything that you wish to
know about Pressure Regulators
Pressure Transmitters and Sensors
Pneumatic
Pressure Transmitter - Pauline Gill - Pneumatic
transmitters and pneumatic positioners represent two of the four distinct
elements in pneumatic process control systems. Pneumatic transmitters sense
process variables such as temperature, flow, pressure, or liquid level and
transmit proportional three to 15 pounds per square inch (psi) process signals
corresponding to 0 to 100 percent of full range to control instrumentation.
Pneumatic positioners receive output signals from pneumatic controllers to
position the control valve's opening percentage to keep a process variable at a
desired set point - from www.ehow.com
Pressure
Sensing Technology - This useful link from Wikipedia
gives a good description of the various sensing technologies.
Pressure
Sensor Technologies - Peter Welander - Pressure
transducers are everywhere, but do you know what’s inside? Choosing the
right technology can be critical, especially in extreme applications -
From Control Engineering
8.10
Ceramic
Sensors Perform well in Tough Applications
- John Van Nostrand and Ravi Jethra - The
purpose of this paper is to: facilitate the advantages of selecting
ceramic pressure measuring cells in applications where plant operations
and maintenance personnel may realize optimum process performance and
stability through the use of ceramic pressure sensors. Identify and
demonstrate the inherent problems of using metal diaphragm pressure cells
particularly in vacuum and chemical service. Bring awareness of enhanced
performance and stability in pressure measurement to plant maintenance,
quality assurance and operations personnel in order to improve their
operation and the bottom line - from Endress+Hauser
Differential Pressure
Differential
Pressure Transmitter Performance-An excellent
guide from http://www.spitzerandboyes.com
Blocked Tappings - Do YOU have problems with
BLOCKED TAPPINGS? Fix them with Clearguard
Autorodder!! This tool has the potential to save big $$ in
production downtime, utilities (purge) use and more importantly to improve safety.
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