Selection of measuring devices on a loop is calculated from a variety of interests and profits.
Life time of a tool and the nature of obsolete a product is not profitable for a production cost if not properly adjusted. Some manufacturers will produce at low cost or lack of attention to quality so that products will have a short life time. Determination of life time itself is not only a malfunction of the equipment to the point of calibration tolerance but may also be determined how often the appliance is problematic. Some products have no guarantee of a good after-sales service centers because of distance or length of the procedures to be performed. Certainly a factory not wanting stop production due waited repairs a equipment.
Obsolete any equipment of a good time is almost unavoidable. Technological progress very rapidly from a few things very harmful to consumers who until now may just depend on the warranty for equipment purchased consumers and even some manufacturers ignore the ease of the warranty by not providing spare parts during the warranty period. In this case the consumer is often harmed by the policy provider factory. Very often konsuen seek improvement with the fastest way because it does not have much time or reference for spare part replacement. Less strict international regulations allow manufacturers to ignore the responsibility of the user.
To prevent or reduce problems such as over a few things need to be considered carefully by consumers.
- Plan with the correct equipment needs to be purchased or replaced.
- Learn the correct equipment required spesifications
- Choose from a reliable BRAND
- Learn the catalog provided by the manufacturer and adjust purposes
- Ask more clearly about the year of manufacture, the warranty period, after-sales warranty and lifetime of the manufacture or obsolete
Wednesday, April 7, 2010
Tuesday, March 30, 2010
Pressure Calibration
Calibration Pressure / Pressure is an activity undertaken to ensure that the zero, span, Accuracy and Linearity of a pressure instrument according to the actual pressure value (standard). Accuracy is determined by comparing the pressure reading instrument with a standard test gauge readings for a few points that can be done at random. Linearity is determined by giving increasing and Decreasing pressure and see the response of the pressure instrument is whether to form a linear equation or a curve equation / polynomial. If not linear then the adjustment should be done. Zero is the value of pressure on the condition of no pressure (1 atmosphere). Span is the difference between maximum value to minimum value. While the range is the minimum value to maximum.
There are 2 kinds of common calibration performed in the project:
1. Calibration Bench is bringing pressure to the shop and instrument calibration done. Standard tool used is the DWT (Dead Weight Tester) is a tool that died a menkonvert heavy metals into pressure. Because weight is the force and the force per unit area is pressure. Besides compared with berpressure DWT already dead (not be changing) pressure instruments are still compared with the Certified Test Standard Gauge.
2. Field Calibration of the field calibration is done by injecting a pressure on the pressure instrument with the line Hand Pump it installed in parallel with the Certified Test Standard Gauge. Pressure reading of instrument readings should be equal to the Standard Gauge Test. Field calibration is generally done only to ensure that during the pre-commissioning process pressure instrument can still work well. In addition to the local reading of the pre-commissioning also needs to ensure Zero, Span, Accuracy and Linearity of the pressure that sent a monitoring system (PLC / DCS).
Kalibrasi Pressure / Tekanan adalah kegiatan yang dilakukan untuk memastikan bahwa zero, span, Akurasi dan Linearitas dari instrumen tekanan sesuai dengan nilai tekanan sebenarnya (standar). Accuracy ditentukan dengan membandingkan tekanan instrumen membaca dengan pembacaan alat pengukur tes standar untuk beberapa poin yang dapat dilakukan secara acak. Linearitas ditentukan dengan memberikan peningkatan dan Berkurangnya tekanan dan melihat respon dari tekanan instrumen adalah apakah membentuk persamaan linear atau suatu persamaan kurva / polinomial. Jika tidak linear maka harus dilakukan penyesuaian. Nol adalah nilai tekanan pada kondisi tanpa tekanan (1 atmosfer). Span adalah selisih antara nilai maksimum untuk nilai minimum. Sementara rentang nilai minimum hingga maksimum.
Ada 2 macam kalibrasi umum dilakukan dalam proyek:
1. Kalibrasi Bench adalah membawa tekanan ke toko dan instrumen kalibrasi dilakukan. Standar alat yang digunakan adalah DWT (Dead Weight Tester) adalah alat yang meninggal menkonvert logam berat ke dalam tekanan. Karena gaya berat dan gaya per satuan luas tekanan. Selain dibandingkan dengan DWT berpressure sudah mati (tidak akan berubah) instrumen tekanan masih dibandingkan dengan Certified Test Gauge Standard.
2. Kalibrasi bidang kalibrasi di lapangan dilakukan dengan memasukan tekanan tekanan pada instrumen dengan garis tangan Pompa itu terpasang secara paralel dengan Certified Test Gauge Standard. Tekanan pembacaan pembacaan instrumen harus sama dengan Test Gauge Standard. Bidang kalibrasi umumnya dilakukan hanya untuk memastikan bahwa selama proses komisioning pra-instrumen tekanan masih bisa bekerja dengan baik. Selain pembacaan lokal pra-komisioning juga perlu memastikan Nol, Span, Akurasi dan Linearitas dari tekanan yang mengirim sebuah sistem pemantauan (PLC / DCS).
Nova Kurniawan
Bachelor of Engineering Physics, ITB 2004, worked at J Ray McDermott
There are 2 kinds of common calibration performed in the project:
1. Calibration Bench is bringing pressure to the shop and instrument calibration done. Standard tool used is the DWT (Dead Weight Tester) is a tool that died a menkonvert heavy metals into pressure. Because weight is the force and the force per unit area is pressure. Besides compared with berpressure DWT already dead (not be changing) pressure instruments are still compared with the Certified Test Standard Gauge.
2. Field Calibration of the field calibration is done by injecting a pressure on the pressure instrument with the line Hand Pump it installed in parallel with the Certified Test Standard Gauge. Pressure reading of instrument readings should be equal to the Standard Gauge Test. Field calibration is generally done only to ensure that during the pre-commissioning process pressure instrument can still work well. In addition to the local reading of the pre-commissioning also needs to ensure Zero, Span, Accuracy and Linearity of the pressure that sent a monitoring system (PLC / DCS).
Kalibrasi Pressure / Tekanan adalah kegiatan yang dilakukan untuk memastikan bahwa zero, span, Akurasi dan Linearitas dari instrumen tekanan sesuai dengan nilai tekanan sebenarnya (standar). Accuracy ditentukan dengan membandingkan tekanan instrumen membaca dengan pembacaan alat pengukur tes standar untuk beberapa poin yang dapat dilakukan secara acak. Linearitas ditentukan dengan memberikan peningkatan dan Berkurangnya tekanan dan melihat respon dari tekanan instrumen adalah apakah membentuk persamaan linear atau suatu persamaan kurva / polinomial. Jika tidak linear maka harus dilakukan penyesuaian. Nol adalah nilai tekanan pada kondisi tanpa tekanan (1 atmosfer). Span adalah selisih antara nilai maksimum untuk nilai minimum. Sementara rentang nilai minimum hingga maksimum.
Ada 2 macam kalibrasi umum dilakukan dalam proyek:
1. Kalibrasi Bench adalah membawa tekanan ke toko dan instrumen kalibrasi dilakukan. Standar alat yang digunakan adalah DWT (Dead Weight Tester) adalah alat yang meninggal menkonvert logam berat ke dalam tekanan. Karena gaya berat dan gaya per satuan luas tekanan. Selain dibandingkan dengan DWT berpressure sudah mati (tidak akan berubah) instrumen tekanan masih dibandingkan dengan Certified Test Gauge Standard.
2. Kalibrasi bidang kalibrasi di lapangan dilakukan dengan memasukan tekanan tekanan pada instrumen dengan garis tangan Pompa itu terpasang secara paralel dengan Certified Test Gauge Standard. Tekanan pembacaan pembacaan instrumen harus sama dengan Test Gauge Standard. Bidang kalibrasi umumnya dilakukan hanya untuk memastikan bahwa selama proses komisioning pra-instrumen tekanan masih bisa bekerja dengan baik. Selain pembacaan lokal pra-komisioning juga perlu memastikan Nol, Span, Akurasi dan Linearitas dari tekanan yang mengirim sebuah sistem pemantauan (PLC / DCS).
Nova Kurniawan
Bachelor of Engineering Physics, ITB 2004, worked at J Ray McDermott
Control Valve Calibration
Posted on March 30, 2008 by novakurniawan
Control Valve is the term used for a valve that has the ability throatling or too gradual changing. Is on-off valve including valve controlled? Yes, but rarely referred to as a control valve. Control valve in particular for the valve that can receive both analog command with analogue signals and digital signals collection.
Calibration control valve is needed to ensure that the control valve actuation can produce responses as desired by the control system in a process. Actuation response is meant to include the accuracy values, Linearity, and also the response time course. Control valve as an actuator in a control loop has an important role in a process meregulating. Meregulating failure in a process abnormality is an indication of an ongoing process that if the shutdown effect.
There are 2 kinds of calibration commonly known in the valve control Manual and Auto Calibration Calibration.
Manual calibration is the calibration by using the manual input to control valve and as a comparison is the pengkalibrasi. The core of the calibration is to bring value to the actual value. Value of a control valva is opening / opening. Openings in the form of a percentage value. Common sense says that the five points which is used as a benchmark standard for control valve opening. 0%, 25%, 50%, 75%, 100%. Calibration activity is to mengsinkronkan valve control inputs in the form of analogue signal (assumed Hart) by opening control valve. Value as a standard 4-20 mA instrumentation expanded to represent the opening of a 4mA, 8mA, 12mA, 16mA, 20mA.
In the known control valve terminology Quick Opening, Linear, Equal Percentage. This term to indicate the relationship between the opening and flow rate. The question that arises is whether the Valve Quick Opening, or Equal Percentage travelnya the opening is not linear with input signal? Fisher people's opinion that the Quick Opening, Linear, and Equal Percentage is already characteristik trim is set on the geometry of the valve Cv values. So that the input signal to the opening should always be linear.
But there again the question why it is possible to change the input to Quick Opening characteristik, Linear, and Equal Percentage with a setting of 375 Handheld Communicator Hart? For what?. To produce a response signal or a parabolic curve. I have not found specific answers about it. But the requirement of the process allows to give a response that is parabolic of a control valve, when the process to be controlled is not linear. So that it can be concluded that the control response can also be a quick opening, linear, or equal percentage.
Distance travel is also important to note in the calibration. Distance travel is absolutely mechanical control adjusts the valve stem. Travel distance is the distance from fully open to fully closed. Fully closed means had not diadjust but to fully open the valve to give some flexibility to the user to shorten or lengthen travel. The main reference in the construction phase is that the travel distance should be in accordance with the data sheet. If the distance of travel of the control valve will open as the maximum detect 100%. Suppose you are a distance control valve travelnya 3 ", but in reality is mechanical is 4" then the travel value of the calibration phase 4 "is considered as 100%, when it should be when referring to the datasheet to travel 3" then the value of opening 4 "is approximately 133%. Therefore have to be really sure that the travel distance is in compliance with the requirements in the datasheet to adjustment on the stem.
Autocalibration can be done by using Fisher 375 Handheld. Select the menu and auto calibration. Automatic valve for menstroke highest postition with full control valve, the value will be regarded as automatic 100% value. Then the valve will be fully closed for the value, and the value is 0%. Valve and calibrated already.
Initial opening becomes important when tight shut-off to be the main thing. This means that when fully closed valve, 0% controls have to be really tight. How sure? Case for FC, the first step make sure that when the feedback shows 0%, then its pressure release control valve, then there is no movement down again. Or by sending a signal below the minimum value of 4 mA, 3.8 mA for example the control valve can also have not come down again. Kalo is calibrated control valve but when delivered 3.8 mA control signal valve is still down more then the value of 0% is not fully tight.
Things to note when doing the calibration is in the control valve out of service condition. Protection and calibration must be removed. Make sure the input characteristics and send to the control valve. After calibration is complete the control valve is returned to the condition of in-service.
There was a question from a blogger know about how the calibration by using PLCs from HMI. This term is known as Remote Calibration. In this project the remote calibration is generally performed in the Pre-Commissioning phase. In Hart & Fieldbus technology, remote calibration is normally done. There is special software that serves as Communicator Hart & FF is installed in the HMI that can run the calibration mode. AMS Device Manager software I've ever used clay for the remote control valve calibration. Without additional software but want to do calibration? Hmm ... I've found a PLC belom could do without the help of remote calibration technician in the field. It means I never know the PLC can mengedjust I / P is automatic if there is a problem when the signal is sent 25% (8 mA) was 50% valvenya openings. Another story, if such condition would then be sent technicians to the field to ngedjust I / P, because if the case is adjustmentnya by technicians who do not PLC calibration but the technician who did the calibration. PLC works there only send signal AO.
Does AO dr PLC for opening a percentage as well? Mmm ... that's PLCs can be defined through the program. Want contrived percentage or other amount that can be done by programmers. But normally the output logic PID algorithm calculation is set in the form of MV and this percentage is the control command, is also opening the valve unit is the percentage the command signal from the PLC output (input to control valve) are also more fit in the form of percentage.
Air to Close - Air to Open / Fail to Open - Fail to Close
There is enough explanation easy to understand from a senior one kumpeni in Jakarta about the concept of FOs / FC this. The main principle used for determining the FC / FO a Control Valve is when the files on the system control valve is in safe condition (low energy). Low energy of a system must be defined by a team of multi-disciplinary involving mainly disciplinary process. Reasonnya play when there is failure then the system should not overpressure, over the level, over flow etc., but getting the energy to decrease and decrease. Proverbial you have a control valve on the inlet pipe which regulates fluid into the vessel, so if there is fail then you'll want to stop the flow so as not to overflow the control valve, attach the Fail to Close (Air to Open). Example for Fail to Open (Air to Close) is the easiest for overpressure protection of a vessel. If the pressure is too high then there must be a discarded gas. If for example the line exhaust valve control is given to Fail to Open, which means that if the system fail then the control valve to be open and protect the pressure of the overpressure in the vessel. More exactnya must use the evaluation process the expert is a process engineer. The key is in the valve control conditions fail, then the system should lead not to OVER SECURE.
Nova Kurniawan
Bachelor of Engineering Physics, ITB 2004, now works at J Ray McDermott
Control Valve is the term used for a valve that has the ability throatling or too gradual changing. Is on-off valve including valve controlled? Yes, but rarely referred to as a control valve. Control valve in particular for the valve that can receive both analog command with analogue signals and digital signals collection.
Calibration control valve is needed to ensure that the control valve actuation can produce responses as desired by the control system in a process. Actuation response is meant to include the accuracy values, Linearity, and also the response time course. Control valve as an actuator in a control loop has an important role in a process meregulating. Meregulating failure in a process abnormality is an indication of an ongoing process that if the shutdown effect.
There are 2 kinds of calibration commonly known in the valve control Manual and Auto Calibration Calibration.
Manual calibration is the calibration by using the manual input to control valve and as a comparison is the pengkalibrasi. The core of the calibration is to bring value to the actual value. Value of a control valva is opening / opening. Openings in the form of a percentage value. Common sense says that the five points which is used as a benchmark standard for control valve opening. 0%, 25%, 50%, 75%, 100%. Calibration activity is to mengsinkronkan valve control inputs in the form of analogue signal (assumed Hart) by opening control valve. Value as a standard 4-20 mA instrumentation expanded to represent the opening of a 4mA, 8mA, 12mA, 16mA, 20mA.
In the known control valve terminology Quick Opening, Linear, Equal Percentage. This term to indicate the relationship between the opening and flow rate. The question that arises is whether the Valve Quick Opening, or Equal Percentage travelnya the opening is not linear with input signal? Fisher people's opinion that the Quick Opening, Linear, and Equal Percentage is already characteristik trim is set on the geometry of the valve Cv values. So that the input signal to the opening should always be linear.
But there again the question why it is possible to change the input to Quick Opening characteristik, Linear, and Equal Percentage with a setting of 375 Handheld Communicator Hart? For what?. To produce a response signal or a parabolic curve. I have not found specific answers about it. But the requirement of the process allows to give a response that is parabolic of a control valve, when the process to be controlled is not linear. So that it can be concluded that the control response can also be a quick opening, linear, or equal percentage.
Distance travel is also important to note in the calibration. Distance travel is absolutely mechanical control adjusts the valve stem. Travel distance is the distance from fully open to fully closed. Fully closed means had not diadjust but to fully open the valve to give some flexibility to the user to shorten or lengthen travel. The main reference in the construction phase is that the travel distance should be in accordance with the data sheet. If the distance of travel of the control valve will open as the maximum detect 100%. Suppose you are a distance control valve travelnya 3 ", but in reality is mechanical is 4" then the travel value of the calibration phase 4 "is considered as 100%, when it should be when referring to the datasheet to travel 3" then the value of opening 4 "is approximately 133%. Therefore have to be really sure that the travel distance is in compliance with the requirements in the datasheet to adjustment on the stem.
Autocalibration can be done by using Fisher 375 Handheld. Select the menu and auto calibration. Automatic valve for menstroke highest postition with full control valve, the value will be regarded as automatic 100% value. Then the valve will be fully closed for the value, and the value is 0%. Valve and calibrated already.
Initial opening becomes important when tight shut-off to be the main thing. This means that when fully closed valve, 0% controls have to be really tight. How sure? Case for FC, the first step make sure that when the feedback shows 0%, then its pressure release control valve, then there is no movement down again. Or by sending a signal below the minimum value of 4 mA, 3.8 mA for example the control valve can also have not come down again. Kalo is calibrated control valve but when delivered 3.8 mA control signal valve is still down more then the value of 0% is not fully tight.
Things to note when doing the calibration is in the control valve out of service condition. Protection and calibration must be removed. Make sure the input characteristics and send to the control valve. After calibration is complete the control valve is returned to the condition of in-service.
There was a question from a blogger know about how the calibration by using PLCs from HMI. This term is known as Remote Calibration. In this project the remote calibration is generally performed in the Pre-Commissioning phase. In Hart & Fieldbus technology, remote calibration is normally done. There is special software that serves as Communicator Hart & FF is installed in the HMI that can run the calibration mode. AMS Device Manager software I've ever used clay for the remote control valve calibration. Without additional software but want to do calibration? Hmm ... I've found a PLC belom could do without the help of remote calibration technician in the field. It means I never know the PLC can mengedjust I / P is automatic if there is a problem when the signal is sent 25% (8 mA) was 50% valvenya openings. Another story, if such condition would then be sent technicians to the field to ngedjust I / P, because if the case is adjustmentnya by technicians who do not PLC calibration but the technician who did the calibration. PLC works there only send signal AO.
Does AO dr PLC for opening a percentage as well? Mmm ... that's PLCs can be defined through the program. Want contrived percentage or other amount that can be done by programmers. But normally the output logic PID algorithm calculation is set in the form of MV and this percentage is the control command, is also opening the valve unit is the percentage the command signal from the PLC output (input to control valve) are also more fit in the form of percentage.
Air to Close - Air to Open / Fail to Open - Fail to Close
There is enough explanation easy to understand from a senior one kumpeni in Jakarta about the concept of FOs / FC this. The main principle used for determining the FC / FO a Control Valve is when the files on the system control valve is in safe condition (low energy). Low energy of a system must be defined by a team of multi-disciplinary involving mainly disciplinary process. Reasonnya play when there is failure then the system should not overpressure, over the level, over flow etc., but getting the energy to decrease and decrease. Proverbial you have a control valve on the inlet pipe which regulates fluid into the vessel, so if there is fail then you'll want to stop the flow so as not to overflow the control valve, attach the Fail to Close (Air to Open). Example for Fail to Open (Air to Close) is the easiest for overpressure protection of a vessel. If the pressure is too high then there must be a discarded gas. If for example the line exhaust valve control is given to Fail to Open, which means that if the system fail then the control valve to be open and protect the pressure of the overpressure in the vessel. More exactnya must use the evaluation process the expert is a process engineer. The key is in the valve control conditions fail, then the system should lead not to OVER SECURE.
Nova Kurniawan
Bachelor of Engineering Physics, ITB 2004, now works at J Ray McDermott
Tuesday, February 2, 2010
| atas kiri | atas tengah | atas kanan | |
| atas kanan tengah kiri | tengah tengah | coba juga | tengah kanan |
| bawah kiri | bawah tengah | kiri bawah | coba |
| atas kiri | atas tengah | atas kanan | |
| atas kanan tengah kiri | tengah tengah | coba juga | tengah kanan |
| bawah kiri | bawah tengah | kiri bawah | coba |
| atas kiri | atas tengah | atas kanan | |
| atas kanan tengah kiri | tengah tengah | coba juga | tengah kanan |
| bawah kiri | bawah tengah | kiri bawah | coba |
Subscribe to:
Posts (Atom)
