Pressure Transducer

Pressure Transducer

The electrical interpretation of pressure is based upon the principle of operation of a strain gauge, wherein structural deformation of the load sensitive member of the device called wire grid is measured. When the gauge is subjected to load the wire grid is stretched, changing its diameter and length and its electrical resistance, thus through measurement of the change in resistance of the wire grid with the gage under stress and evaluation of the force producing  the load is obtained.

This operation involve load and pressure from 100 pound to more than 10,000 psi.

Desuperheaters

Desuperheaters

A desuperheaters is to reduce the temperature of superheated steam. The simplest construction of this device involves single or multiple spray nozzles that are inserted into the steam header, allowing water to be sprayed into the steam flow to reduce its temperature. By regulating the water quantity through the desuperheater, the degree of heat absortion can be controlled and desired steam temperature maintained. This mechanically atomized desuperheaters is used both small and large pipelines.

Other desuperheaters design utilize atomizing steam flow to produce a fine spray of atomized cooling water into the steam line. The steam assisted design offer excellent performance at low cost.

For small process lines, a desuperheater which relies on full circle water injection can maintain final temperature to within 20 degree F of saturation in pipe sizes down to 1 inch.

Electrical Heat Tracing

Instrument Junction Box Termination Dwg

Single Line Diagram

Lightning Protection Installation

Lighting Installation

Grounding Installation

Condensate Seal Pot

Instrument Air Manifold

Earth Resistance Testing

Light illumination Test

Instrument Loop Diagram

Standard Signal for Industial Instrumentation

Pneumatic
- Range

• 20kpa to 100 kpa
• 0.2 kg/cm2 to 1.0 kg/cm2
• 0.2 bar to 1.0 bar
• 3 psi to 15 psi
• 3 psi to 27 psi
• 6 psi to 30 psi

Electric
- Range

• 1 Vdc to 5 Vdc
• 0 Vdc to 10 Vdc
• 4mA to 20 mA
• 10mA to 50 mA

Instrument Process Hook-up

HT Cable Testing

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Loop Folder or Test Packs

Harmonic Distortion Test

Motor Control Functional Testing

Below is the method of the Motor control functional test
- set the isolator of the RCU in the field to open position
- remove the lock out tag out (LOTO), then rack in the feeder and close the isolator on the draw-out unit.
- measure the incoming voltage, check the phase sequence of the incoming power at field
- Open the isolator at draw-out unit
- Closed the isolator at the RCU
- Closed the isolator at the draw-out unit
- initiate start at the substation
- verify the rotation of the motor, if the rotation is correct direction
- then verify the running signal of the motor if it is link to DCS
- initiate trip at the substation draw-out unit
- verify the status of the motor at the field as well as in the DCS
- reset trip at substation draw-out unit
- verify again the status in DCS
- initiate start in the field (RCU)
- verify the status at DCS, if confirmed running signal
- then stop the motor at RCU and verify the status in DCS if confirmed
- Open the isolator in substation draw-unit and rack out
- Put Lock out tag out (LOTO)
- Test complete

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Spiral Gage

Spiral type measuring element
Is used to measure pressure
Ranges from 18 to 4000 psi
It is made of a thin walled tube flattened on
opposite Side to produce an elliptical cross section
then formed into a spiral when pressure is applied
 into the open end tube tends to uncoil
The pointer is directly connected to the spiral
 to measure equivalent pressure reading

 

Loop Checking (Cold/Hot)

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Motor No Load Testing

Cable Insulation Testing

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MANOMETER

U-tube Manometer

Difference in Height of the fluid
in the two arms is the difference
in the pressure between
PL & PH Expressed in Height of
the Fluid

 

 

Well type Manometer

 

It is an industrial manometer

whose one arm is replaced by a

large diameter well so that the

pressure differential is indicated

only by the height of the column

in single arm. The area AH of the well

should be as great a possible compared

to area AL of the arm for good readability

on the arm.

 

 

Inclined Tube Manometer

Used to accurately read small pressure
differences between PL and PH the
inclined arm serves to expand the scale
of the instrument thereby increasingly
readability.

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Cable Termination

Cable Gland

Instrument Junction Box

Control Cable

Power Cable

Instrument Cable

Cable Way

Instrument Stanchion

Instrument Support

-is the term for stand, it is a steel support where by transmitter is mounted.

Normally constructed from 2 inch pipe schedule 40 or 80 with steel plate,
the transmitter is attached to the stand by means of bracket provided
by the transmitter vendor.

Stand can be accommodate one or more transmitter.

Stand can be fabricate with Earth connection for the transmitter protective earth.

For transmitter which does not have electrical parts such as gauges,
pneumatic transmitter, The requirement for earth connection can be eliminate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Instrument typical drawing which details stand is shown in
instrument installation drawing.

This drawing contains details of material description of the stand
 and bill of quantity required for the installation works.


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About Me

Welcome to my blog. I am Ronnie. I have many experience in Oil/Gas Industries for Electrical,
Instrumentation and CAD I want to share you some of my knowledge.
Hope it will be usefull to you. Thanks a lot

CAD

Generating graphic is one of the most exciting application of computers. it allows representation of complex figures in an informative and interesting manner. the field of computer graphics is of great technical importance. CAD is one of its useful applications. in the  beginning, it was a drawing tools use exclusively on mainframe computer systems, but now is being used on personal computer. CAD has evolved into a powerful drafting, design and engineering. Many software are available for drafting but most versatile and popular one is AUTOCAD.

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Instrumentation

A science which deals the measurement and evaluation and to control a process variable or any device used directly or indirectly to measure  and control process variable. Is an instrument they are used for pressure, temperature, level, flow, analysis, weight and miscellaneous parameter, system component included gauges, transmitter, indicator, recorders, controllers, alarms, safety shutdown devices, relief valves, control valves and final control devices.

Electrical

Electricity appears in one of two forms which by convention, are called negative and positive electricity. Electric charge is the excess of negative and positive electricity on a body or in space.

Pressure Reducing Regulator

A pressure reducing regulator maintains a desired reduced outlet pressure while providing the required fluid flow to satisfy a variable downstream demand. The value at which the reduced pressure is maintained is the pressure setting of the regulator.
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