1. 2 Haroratni o'lchash
1. 2. 1 All temperature instruments should be equipped with temperature casings (ie warm wells), made of 316 stainless steel, and the process interface is 1½″ flange. Except when other special materials are required for the process medium.
1.2.2 For in-situ temperature indication, a core-pulling protective bimetallic thermometer should be used. The process interface is ½" NPT-M, and the shortest protective tube length should be 150 mm (6 inches).
①Normal operating temperature will be indicated at 1/3 to 2/3 on the dial
②The accuracy grade is ±1.0 percent
③The angle adjustment error should not exceed 1.0 percent of its range
④Universal type (adjustable angle), the case is made of 316 stainless steel, and the diameter of the dial should be 150 mm (6 inches).
1. 2. 3 Temperature switch and local regulator adopt pressure thermometer, the temperature sensing medium filled in the temperature bulb is liquid or gas, the temperature bulb material is 316 stainless steel, the process interface is ½ "NPT-M. The capillary material is 316 Stainless steel armored protective hose, no more than 3 meters in length.
1. 2. The electrical interface of the temperature switch is ½" NPT-F. The switch contact adopts double-pole double-throw type, with a fixed switch hysteresis, and is a gold-plated contact. The switch point is adjustable in the full range, The switch contact capacity is 2Am ps24VDC. The repeatability of the temperature switch is less than or equal to 0.5 percent of the final value of the temperature range.
1.2.5 The in-situ temperature regulator shall meet the following standards:
①The performance of the instrument should be that the maximum error of temperature measurement does not exceed ±{{0}}.5 percent of full scale, and the insensitive area does not exceed ±0.1 percent of full scale.
②The regulator should have three functions: proportional, proportional plus integral, proportional plus integral plus derivative, and have additional functions such as anti-integral saturation, automatic/manual conversion without disturbance switch, and output display.
③The regulator range should be selected as far as possible so that the normal operating temperature is within one third of the middle of the full range, and the migration range with the narrowest scale practicable should be adopted.
1.2.6 For remote temperature measurement, an integral temperature transmitter should be used, and the temperature measurement element is a thermocouple (TC) or thermal resistance (R TD ). The accuracy is ±0.1 percent .
1.2.7 The complete supply range of thermocouple and thermal resistance is as follows:
①Thermocouple or thermal resistance element, including the junction box;
②Connecting terminal;
③External thread joint;
④Temperature sleeve.
1.2.8 The diameter of the temperature measuring element protection tube of the integral temperature transmitter is 6 mm, the material is 316 stainless steel, the process interface is ½ "NPT-M, and the electrical interface is ½ "NPT-F.
1.2.9 When the temperature is in the range of -200-400 degree , Pt100 platinum thermal resistance transmitter is generally used. The high temperature measuring instrument above 400 degree adopts thermocouple transmitter, which has automatic cold junction temperature compensation function and non-linear correction circuit. Offshore oil and gas production devices usually use Pt100 platinum thermal resistance transmitters, non-isolated type installed on site, the transmitter module is epoxy resin encapsulated, with cold junction compensation and nonlinear correction, LCD display, with flameproof junction box .
1.2.10 The integrated digital display temperature transmitter has two display modes: LCD display temperature transmitter uses two-wire system output; LED display temperature transmitter uses three-wire system output. Generally use LCD to display two-wire temperature transmitter.
1.2.11 Intelligent temperature transmitter: output 4-20mA DC signal, and superimpose communication in accordance with H A R T standard protocol. It can communicate with the host computer through the HART modem, or with the handheld device and the PC to remotely manage the model, index number, and range of the transmitter, and perform remote information management, configuration, variable monitoring, calibration and maintenance, and adjust the transmitter according to actual needs. The direction of display shows the measured medium temperature, sensor value change, output current and percentage.
1. 2. 12 haroratli korpus (ya'ni issiq quduq) 8" dan past bo'lgan quvur liniyasiga o'rnatilganda, teskari muhitning oqim yo'nalishi trubaning markaziy chizig'iga 45 graduslik burchak ostida va oxirgi nuqtasi harorat o'lchash elementi quvur liniyasining markazida; 8 dan katta yoki teng masofada o'rnatilganda "Quvurga o'rnatilganda, korpus quvur liniyasiga perpendikulyar bo'ladi va harorat o'lchash elementining oxiri Quvurning diametrining 1/3 dan 2/3 gacha.
1.3 Pressure measurement
1. 3. 1 Selection of pressure range. When measuring stable pressure, the maximum working pressure should not exceed 2/3 of the upper limit of measurement. When measuring pulsating pressure, the maximum working pressure should not exceed ½ of the upper limit of measurement. At high pressure, the maximum working pressure should not exceed 5/3 of the upper limit of the measurement. Generally, the minimum value of the measured pressure should not be lower than 1/3 of the upper limit of the instrument measurement. Thereby ensuring the linear relationship between the output and input of the meter, and improving the accuracy and sensitivity of the meter's measurement results.
1.3.2 Bosim o'lchagichni o'lchash diapazonining standart seriyasi: 0-1, 1,6, 2,5, 4, 6, 10, 16, 25, 40, 60, 100, 160, 250, 400, 600, 1000, kPa 160, va boshqalar. .
1.3.3 The accuracy grade of the pressure gauge is ±1.0 percent .
1.3.4 According to the use requirements of the process, the measuring element of the pressure gauge can be Bourdon tube, coil tube, spiral tube, bellows or diaphragm. Unless the process medium requires measuring elements of other materials, type 316 stainless steel is generally used. The offshore oil and gas production equipment mainly uses diaphragm pressure gauges and Bourdon tube pressure gauges. Overpressure protection devices and dampers are added to the pressure gauges at the compressor and pump outlets, which can prevent the compressor and pump outlet pressure from being unstable. The resulting pressure gauge is damaged.
1.3.5 The pressure gauge should have an over-range protection device to enable it to withstand the maximum pressure that may be received. The minimum diameter of the pressure gauge dial is 5 inches. The pressure gauge housing should be weatherproof, made of 316 stainless steel, with a burst back plate or burst disc (or for pressure relief) on the back of the meter, and the diaphragm material is 316 stainless steel. The pressure gauge installed on the disc should have a built-in case with an axial pressure connection tube at the back, and should not have a range shift mechanism.
1.3.6 The connection size of the pressure gauge is ½"N PT. An isolation valve with a relief and test port should be installed at the interface of all pressure gauges. The valve is 316 stainless steel.
1.3.7 The micro pressure gauge should be of bellows type.
1.3.8 The on-site pressure regulator shall have an indicator to indicate the pressure of the process, and shall have an anti-integral saturation, automatic and manual non-disturbance switch.
1.3.9 All regulators must adopt the migration range to obtain the maximum accuracy and good control effect.
1. 3. 10 The measuring element of the pressure switch is determined to use Bourdon tube, bellows or diaphragm according to the use occasion and pressure. The measuring element is made of 316 stainless steel. The set point is adjustable, and the pressure switch is an instantaneous double-pole double
Throw switch, and gold-plated contacts. The switch contact capacity is 2A m ps24VDC, and the switch contact should be sealed in a closed shell suitable for the explosion-proof grade of the zone.
1. 3. 11 The connection size between the pressure switch and the process should be ½ inch, the connection size with the pneumatic transmission signal should be ¼ inch, and the electrical interface should be ½ "NPT-F.
1. 3. 12 The repeatability of the pressure switch is ±1.0 percent of its set point.
1. 3. 13 Pressure transmitters are used in places that need to transmit measurement data remotely. The detection element of the transmitter is usually a bellows type, made of 316 stainless steel, and should be:
①Force balance, capacitance or strain gauge detection element, with on-site LCD display head, can adjust zero and range.
②The over-range should be 25 percent higher than the maximum working pressure.
③An isolation valve with a relief and test port should be installed at the interface of all pressure transmitters. The valve is 316 stainless steel. The process interface is ½" NPT-M, and the electrical interface is ½" NPT-F.
1. 3. 14 The technical performance of the pressure transmitter is as follows:
①Accuracy ±0.1 percent
②Reproducibility ±0.05 percent
③Temperature influence ±0.1 percent (every 10 degree change in temperature)
1. 3. The detection element of the 15 differential pressure transmitter is usually a bellows type, made of 316 stainless steel, and should be:
①Force balance, capacitance or strain gauge type, and can adjust zero and range.
②The instrument that uses pressure as excitation source should have over-range protection.
③The components in contact with the process fluid are made of materials compatible with the fluid.
④ Each differential pressure transmitter should have a closely connected five-valve group, and the root valve should be installed at the connection with the pipeline or container, made of 316 stainless steel.
⑤The instrument process interface is ½"N PT-M, and the electrical interface is ½"NPT-F.
1. 3. The technical performance of the 16 differential pressure transmitter is as follows: accuracy is ±0.1 percent ; reproducibility is ±0.05 percent ; temperature influence is ±0.1 percent (for every 10 degree change in temperature).
