Spring tube pressure gauge selection, overhaul and calibration

Sulfur Phosphorus Design and Powder Engineering Spring Tube Pressure Selection and Inspection and Calibration Zhang Jingzhong Petrochemical Nanhua Construction Company, Nanjing 210046, Jiangsu Province The pressure in the industrial production process is a very important parameter, which determines whether the production process can be carried out normally. Accurate measurement and control is an important part of ensuring the normal operation and safety of the production process.

Spring tube pressure is the most common instrument for measuring pressure. Correct selection of the service and verification of the spring tube pressure plays a decisive role in the accurate measurement and control of the pressure.

1 The choice of spring tube pressure selection spring pressure is to consider the following aspects.

In order to ensure that the elastic element works reliably within the safe range of elastic deformation, sufficient margin must be considered when selecting the pressure range. Generally, when the measured pressure is relatively stable, the accuracy level of the most selected pressure should be determined according to the maximum measurement error allowed by the production. When the production requirements are met, the pressure of lower precision and durability should be used as much as possible. One-sided pursuit of high precision without regard to the accuracy of the actual measurement will result in undue waste. The specific selection method is as follows.

1 Determine the accuracy level relative to the allowable error based on the relative allowable error when the measured pressure is minimum, taking the pressure of 618 as an example. The minimum measurement position pressure is lower than 2, 3 to ensure that the relative allowable error does not exceed 4, and the jade strength garment with several precision grades should be selected. The large pressure value should not exceed 34 of the full scale; In the case of the maximum pressure value should not exceed 3.

When choosing a pressure coat test. The accuracy of Yulinong should also be considered. The measured pressure should be no less than 3 of the full scale.

Because the accuracy of the part below 13 is lower, it is not suitable.

2 The accuracy level should be selected to use the spring tube pressure of class 1.0.

2 Determine the accuracy grade according to the absolute allowable basic error. The viscosity grade absolutely allows the upper limit of the pressure measurement of the elm step. 100,3 pressure, mosquito working pressure 66, requires absolute allowable basic error + more than 0.153. Should choose 1 grade pressure, but also has auxiliary functions such as control communication. The integrated automation scheme of the distributed structure is to be dispersed on the switchgear, and the corresponding protection set of the switch is set. The monitoring system is located in the central control room. The protection and monitoring system is realized by each set of protection management units, and the signals are digitally used. transmission. Since the connection cable between the protection equipment and the monitoring system cabinet is saved, the integrated automation system of the factory transformer substation can greatly reduce the misoperation of human factors, and the comprehensive sensitivity of the microcomputer unit function can reduce the comprehensive construction cost of the project. It is the development direction of the power supply system of the factory.

However, there is currently no communication protocol for the connection between relay protection and monitoring systems in China. The relevant departments shall formulate national standards as soon as possible for the establishment of open systems, so that users can arbitrarily choose or directly access the equipment protection system monitoring system event recording system of any manufacturer. The electrical workers of the enterprise should be familiar with the comprehensive automation technology and equipment of the substation as soon as possible to accelerate the promotion and application of this technology.

Industry and civil electrical design, was once the head of the electrical department of large sulfur sulphuric acid plant.

High, find hidden dangers in time to recover and Zhang Jing. Spring tube pressure selection. Overhaul and inspection. 45 accuracy grade parent should use 1.5 spring tube pressure.

For the measurement of corrosive media such as acid-base materials, stainless steel spring 矜 and movement should be selected, and the outer cover of stainless steel or bakelite should be used to directly measure high-pressure gas or various harmful effects at the same time corrosive and explosion hazard. When the gas may also be a liquid, the pressure on the back of the gram with a safety hole should be selected. In case of a total external accident when the spring tube is broken, special pressure should be selected when measuring special and explosive gas or a mixture thereof.

For example, to measure oxygen pressure, oxygen pressure with an oil-free label must be used.

2 Spring tube pressure repair Spring tube pressure after a long time of use, or large fluctuations in pressure, it seems that the value of the finger juice is too poor to tap the displacement. The phenomenon of round-trip difference is excessive, and most of them can continue to be used after maintenance adjustment. An introduction to the types of errors and adjustment methods is now available.

2.1 Value error The value error of each pressure value is the same. In this case, the pointer positioning + quasi-caused to remove the pointer, re-accurate positioning under a certain pressure value.

The value error is proportional to the pressure value. This type of error is mainly due to the fact that the gear ratio has changed and the method can eliminate such errors. If the detected error gradually increases with the increase of the pressure value, move the value adjustment screw to the right to increase the arm length of the short arm of the sector gear, that is, lower the gear ratio. Otherwise, the adjustment direction is reversed and the gear ratio is increased.

Nonlinear errors are also known as line errors. The algebraic error increases proportionally with the load and the large decrease, but gradually changes from a positive value to a negative position, or a mountain negative price gradually changes to a lower value. This type of error is generated because the angle of the pointer in the full stroke is greater or less than the scale angle on the dial. This value error can be changed by changing the angle between the link and the sector tooth. Rotate the movement clockwise in the positive and negative directions, or move the end outwards to expand the angle between the fan teeth of the connecting rod. On the contrary, except for the above case, the value of the pressure changes or the positive or negative is irregular. The reason is mostly that the parts are damaged or the spring tube is deformed, and only the parts or spring tubes can be replaced.

In short, in the adjustment of the spring tube pressure value error.

To analyze the specific situation, find the cause, the juice is solved in a sexual manner, it will receive good effect. 1 2.2 Tap displacement The tapping displacement reflects the operation of the components of the spring tube pressure and whether the pointer is displaced. Under normal conditions, after tapping the shell, its pointer should first swing in the direction of counterclockwise, and there must be a tapping displacement.

The tapping displacement is caused by insufficient tension of the hairspring in the pressure or poor fastening of the two ends of the hairspring. As long as the disk is tight or the hairspring is enlarged, the torque generated by the hairspring can be increased. If this is not the case, you should consider whether the hairspring has lost its elasticity and needs to be replaced.

2.3 The difference between the round-trip difference and the long-term use of the heart spring pressure or more or less will produce a value difference between the back and forth. There are mainly the following reasons: the active gap of the joint of the parts and components should be too large to find out the specific part of the gap, and the symptom is solved. First, the joint of the rotating part is crushed or pressed too tightly. The balance of the hairspring is not enough; first, the internal damage of the spring tube must be cleaned, or the deformation of the spring tube must be replaced = 3 The pressure of the spring tube pressure is verified. The calibration is the key to ensure that the measured force value is accurate. The pressures made during the production process must be verified and unqualified. Verification according to the national quality and technical supervision issued by the bullet-like soil-like pressure pressure vacuum and Maokong verification procedures 0521999 implementation of the verification process is no longer praise, this article only introduces two bodies in the verification process.

The absolute allowable error of the pressure is the absolute value of the allowable basic error. The following formula allows the absolute measurement range to be determined, and the viscosity level is 1 fraction.

The accuracy level of the example is 1.5, the measurement range is 0.10.6, the ordinary pressure vacuum of 3, and the absolute error is allowed. The spring tube of the 1st industry is used for calibration. 1 oil, swelling her. , sulfur-phosphorus design and powder engineering AC motor soft starter and its application Zhang Naimin Nanjing Suning Engineering Construction Supervision Company, Nanjing 210016, Jiangsu, China, and the impact of equipment, analysis and comparison of several motor starting methods, a brief introduction to all-digital AC asynchronous motor Soft starter A new all-digital AC motor soft starter has been used in a certain sulfuric acid plant for many years, fully demonstrating its function. The NPC has the advantages of reducing the impact of starting shock and vibration on electricity and equipment, and has the advantages of compact installation, easy commissioning, reliable operation and convenient maintenance. Its performance price ratio is high, it can save a lot of investment compared with starting with frequency converter. It is an ideal choice to replace the internal coupling transformer star angle starter liquid is a coupler frequency sensitive snubber and sputum starter. The bypass contactor is put into operation, the motor is directly connected to the grid, and the starter is withdrawn. If you want to save more investment, you can start multiple motors with a soft starter. 1 Start and run characteristics of AC asynchronous motor Start is a special operating state of AC asynchronous motor. Firstly, it must meet the requirements of production process, and also make motor Can operate reasonably. The main requirement for its starting performance is that it has a large starting torque. In order to ensure that the production machinery can start normally, the motor is convenient under the premise of ensuring the starting torque of a certain size; the smaller the energy loss during the starting process, the better.

Evaluation of the starting performance of an asynchronous motor depends mainly on its starting torque and starting current. It is generally desirable to obtain a large starting torque when the starting current is relatively small. Ordinary asynchronous motors, including squirrel-cage motors and wound-wound motors, are directly connected to the rotor windings of the grid-starting-wound motor if they are not taken. The inherent starting characteristics are just opposite to the above requirements. The starting torque is small.

Under normal circumstances, the starting current of the motor is 47 times the current of the normal running current, and the starting torque is 0.81.8 times of the rated turning. Excessive starting current surges will cause grid voltage fluctuations, affecting the normal operation of other motors and electrical equipment connected to the same grid. For itself, an excessive starting current will cause it to be subjected to excessive electromagnetic force shocks if it is frequently started.

It can also make the winding of the motor overheat and burn out. The small starting torque will lengthen the starting time of the drag system. Affect the process.

In order to improve the starting performance of the asynchronous motor, the key is to limit its starting turbulence. Control principle and main technical characteristics of the fire start torque 2 soft starter There are several soft starters on the market. Their principle is universal, and they all improve the inherent starting characteristics of the motor and try to make the starting current as small as possible. The starting torque is large. The starting process is as smooth as possible, the equipment cost is low, and the energy loss during the starting process is low. The all-digital AC motor soft starter introduced in this paper is also called intelligent motor controller. It adopts American Digital 8 company's digital modular multi-function solid-state controller, and the range with peripheral power friends should be verified and range. Or, the end of the spring tube pressure volume is not large and low price, it is easy to be ignored in the industrial production process. We should pay attention to it in our work. Strictly grasp the choice of this Ge Lili. Overhaul and calibrate every step to ensure the safe and normal operation of the production process.

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