Bengbu Aipu Compressor Manufacturing Co.,Ltd.

The Main Composition of CNG Gas Compressor Unit(2021年08月27日)

aipucompressor — 2021-08-05T18:40:52+0900

https://www.aipucompressor.com/products/cng-compressor/

The unit is mainly composed of: engine, compressor, pressure vessel, fuel gas system, automatic control system, cooling system, lubrication system, starting system, etc. These devices are combined into a whole through connection, and the CNG gas compressor is equipped with a sensitive sensor to alarm and stop.

Once an abnormality occurs in a boil off gas recovery system, the sensor sends a signal to the ECM. The ECM compares and analyzes the received data with the system setting parameters, and finally sends an alarm or shutdown signal to force the CNG gas compressor to stop running, thereby ensuring the safety of the equipment.

The engine is connected to the CNG compressor machine through a coupling, which drives the compressor unit to move in reciprocating piston motion to achieve compression of the gas. The pressure vessel mainly plays a role of filtering, washing and buffering.

As the monitoring and information transmission of the whole system, the automatic control system ensures the safe operation of the whole system.

The cooling system mainly uses antifreeze to cool the parts of the engine and compressor that need to be cooled to ensure that the temperature of the entire system is within the normal range. The normal operation of the entire system mainly depends on whether the lubrication is good. If the lubrication is not good, it will cause serious internal wear of the equipment and even cause journal sticking.

The starting system, as the initial power for the operation of the equipment, also affects whether the equipment can start and run smoothly.

In short, all systems of the CNG gas compressor unit are indispensable, and the internal structure is coordinated to ensure the safe and stable operation of the entire system.

Aipu is one of the leading reciprocating natural gas compressor manufacturers in China that can offer various types of compressors used in oil and gas industry. Contact us to know more and get an attractive price.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best gas compressor manufacturers.

Analysis and Elimination of Common Faults of Natural Gas Compressor(2021年08月26日)

aipucompressor — 2021-08-05T18:40:19+0900

https://www.aipucompressor.com/products/

What are the common faults of natural gas compressors and how to eliminate them? As one of the leading reciprocating natural gas compressor manufacturers, Aipu would like to advise you on some tips about various types of gas compressor including BOG compressor, CNG compressor, boil off gas compressor, etc.

1. Substandard exhaust may be caused by valve leakage, packing leakage, and excessive cylinder clearance volume. Therefore, it is necessary to check these places and take corresponding measures when the exhaust volume is not up to the standard.

2. When the interstage pressure exceeds the range, it is necessary to check the exhaust and intake pressure of the current stage and the piston ring leakage of the intake valve of the next stage. If necessary, replace the air valve or adjust the exhaust and intake pressure or replace the piston ring to check whether the pipeline is unobstructed.

3. Excessive exhaust temperature may be caused by exhaust valve, poor cooling effect or intake temperature exceeding the specified value. Therefore, it is necessary to replace the exhaust valve or improve the cooling effect, and find out the reasons why the temperature exceeds the specified value.

4. The overheating of the cylinder may be caused by insufficient cooling water, air leakage in the intake or exhaust valve, or strain of the cylinder. At this time, it is necessary to add cooling water, maintain or replace the intake or exhaust valve, and lubricate the cylinder to clean the cylinder.

5. The possible causes of low oil pressure in natural gas compressors are low oil level, blockage of the oil filter, and oil leakage in the oil return valve of the regulating valve. At this time, it is necessary to add lubricating oil or clean the lubricating oil, clean the filter, repair or replace the corresponding parts.

6. The high temperature of the lubricating oil may be caused by the friction between the moving parts of the natural gas compressor and the poor cooling effect of the lubricating oil and the clogging of the filter. At this time, it is necessary to replace related parts and replace the lubricant cleaning filter.

7. Generally, more than 85% of natural gas compressor shutdowns are caused by gas valve failure. Therefore, it is necessary to check whether the valve plate and valve spring are damaged, whether the sealing performance of the valve is deteriorated, and whether the valve plate pressure is correct.

8. The breakage of the piston rod is very dangerous, because it not only damages other parts, but also causes gas leakage, causing casualties and other production equipment damage. Generally, it is mainly because of the material problem of the piston rod or the heat treatment problem that the connection thread is loose or the gap is too large, and other faults cause overload operation.

9.Excessive vibration will cause various parts of the compressor or each connection of the pipeline to loosen, and in severe cases, it will cause the pipeline to vibrate and cause air leakage problems or abnormal noise. Therefore, the necessary regular maintenance and inspection can reduce the occurrence of such problems.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best oil and gas compressor manufacturers.

The Fault and Mechanism of Reciprocating Compressor's Thermal Performance(2021年08月20日)

aipucompressor — 2021-08-05T18:39:48+0900

https://www.aipucompressor.com/products/

1. The types and causes of the thermal performance faults of common reciprocating compressors are various.

From related data and researches, it can be known that the main causes of thermal performance faults of reciprocating compressors are the damage of the packing box, the air valve and other wearing parts. The fault of the packing box greatly reduces the displacement and makes the pressure ratio imbalance.

Statistics show that valve faults account for 60% of the total number of reciprocating compressor faults. Valve faults can cause pressure ratio imbalance, increase in exhaust temperature, and decrease in exhaust volume. In severe cases, the cylinder can even be scraped and thus the unit can be useless. During the actual production, field operators often make diagnosis based on it.

2. The fault and mechanism of reciprocating compressor's mechanical function

The types and causes of the mechanical function faults of common oil and gas compressor are also manifold.

Typical mechanical faults in the production process include valve plate chipping, cross-head and piston rod fracture, piston ring fracture, cylinder cracking, cylinder and cylinder head fracture, crankshaft fracture, connecting rod fracture and deformation, connecting rod bolt fracture, piston sticking and cracking, fuselage fracture and tile burning, motor failure, etc.

Practice has proved that the diagnosis of valve faults is very significant in the diagnosis of reciprocating compressor faults, but piston rod fracture and cracking are more common. Due to the large number of moving parts, most of the faults are mechanical function faults.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best gas compressor manufacturers.

Working Principle of Reciprocating Compressor(2021年08月19日)

aipucompressor — 2021-08-05T18:39:17+0900

https://www.aipucompressor.com/products/

Reciprocating compressors have the advantages of low noise and high efficiency, and they are currently widely used in petrochemical and natural gas industries.

The working principle of reciprocating compressors:
Reciprocating compressors are generally composed of several parts, such as working cavity, crank connecting rod, auxiliary system, etc. The crank connecting rod is the most critical transmission part as well as the main power supply component, which can realize the conversion of reciprocating motion and complete the exhaust and suction process of the reciprocating compressors.

The work of reciprocating gas compressor can be divided into four parts:

The first is the expansion phase.

The movement of the piston causes the volume in the working cavity to increase. At the same time, the high-pressure gas remaining inside will collide. But during the time the air valve is closed and only the pressure is small enough to a certain extent before it opens.

The second is the inhalation phase.

The air valve is opened under the influence of the pressure difference. The volume of the working cavity increases at the same time, and it continuously sucks gas.

The third is the compression phase.

The piston runs in the reverse direction, and the volume of the working cavity decreases. The air valve is still closed when the working cavity pressure increases, so the gas will be compressed.

The fourth is the exhaust phase.

When the pressure of the working cavity is greater than the pressure of the exhaust pipe, the gas will be discharged.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best oil and gas compressor manufacturers.

Installation Points of Reciprocating Compressor(2021年08月13日)

aipucompressor — 2021-08-05T18:38:39+0900

https://www.aipucompressor.com/products/

The reciprocating compressor is mainly composed of motor, body, cylinder, buffer, separator and other parts, and is supplied separately. When the components are delivered to the site, the construction personnel need to clean up the components and strictly follow the operating specifications to gradually complete the installation.

(1) Main points of body installation

After the body foundation is installed, temporary tools, jacks, etc. should be used to adjust the position of the body to ensure that the vertical and horizontal center lines of the body base surface are consistent with the reference line. The error between the two should be less than 5 mm. At the same time, adjust the inclined shim to ensure that the elevation of the axis of the unit is consistent with the design elevation, and the error should be less than 3 mm. Finally, perform a grouting on the position reserved for the anchor bolt holes in the machine body. During the grouting process, ensure that the anchor bolts are in the middle of the base bolt holes. After grouting, it takes 5-7 days to cure and solidify the grouting layer.

(2) Main points of motor installation

In the installation of the motor, the lpg compressor host can be used as a reference for leveling and alignment. When installing the motor, check carefully to ensure that the level of the motor is within 0.1 mm/m. For the motor shaft and the compressor host shaft, this is one of the key steps in the installation process. The motor of the reciprocating compressor uses sliding bearings. The position of the magnetic center line of the motor must be determined, and then the motor shaft and the compressor host shaft should be aligned. This process can be completed by adjusting the motor iron pad to control the axial displacement deviation of the motor within 0.05 mm. After the debugging work is completed, the fundamental iron pad set of the motor and compressor should be spot-welded into a whole. After the second grouting, align the motor shaft and the compressor host shaft.

(3) Main points of crankshaft, connecting rod and cross-head installation

When accessories such as crankshafts, connecting rods, and cross-heads are shipped from the factory, oil seal is used to prevent rust. During the installation of accessories, these accessories must be cleaned first to ensure that the oil holes and grooves of these accessories remain unblocked. Paint and scrape the main bearing shell and the connecting rod head bearing shell to ensure good contact between these parts and the crankshaft journal, and the contact area should reach more than 80%. The lead wire method is used to check the gap between the crankshaft journal and the connecting rod head bearing shell and the main bearing shell. The gap between the crankshaft journal and the connecting rod head bearing shell is controlled within 0.12-0.21mm, the clearance between the main bearing shell and the main bearing diameter is controlled within 0.12-0.21mm, and the axial clearance between the main bearing positioning shell and the main bearing is controlled within 0.20-0.40mm. At the same time, the same method should be adopted to deal with the small connecting rod head bearing shell and pin bearing. The gap of the small connecting rod head bearing shell and cross-head pin should be controlled within 0.06-0.11mm.

(4) Main points of cylinder installation

Cylinder installation is based on the axis line of the middle slide-way, and check and align the center lines of cylinders at all levels. The inclination direction of the cylinder should be consistent with the inclination direction of the middle slide-way. If the direction is inconsistent, investigate the causes and take measures to solve it. It can be corrected by adjusting the cylinder support and the contact surface between the connecting cylinder and the reciprocating compressor. It is forbidden to use offset pads or other external forces for correction.

(5) Main points of packing installation

Sealing packing is an important part of the compressor, which can prevent leakage of the storage in the cylinder. Before the packing is installed, all parts should be cleaned thoroughly to ensure that there is no oil pollution. Install according to the installation serial number, and adjust the sealing ring so that it is in the axial gap of the sealing cavity. Some problems should be paid attention to during the packing installation process: the packing cavity should be reinstalled in the order of the original number, otherwise the cooling water will be short-circuited; check the water circuit, oil circuit, and air leakage to ensure that they are unobstructed; perform a hydraulic test after installation.

(6) Main points of piston installation

Generally speaking, when the piston is manufactured, the sports piston rod of the piston has been connected and fixed in accordance with the corresponding requirements to form a whole, which does not need to be dismantled and reinstalled in the construction site. When installing the piston ring and the support ring, ensure that they can move freely in the groove, and the piston rings with different cuts should be assembled crosswise. Check the gap among the piston ring, support ring and piston ring groove during installation. The piston ring is connected with the cross-head in hydraulic way, and the clearance between the front and rear dead centers of the piston is checked by the lead pressure method after connection. In addition, check the dead center clearance and radial clearance between the cylinder and the piston to make the clearance value meet the relevant regulations. It should be noted that the bolts of the piston must be tightened with an electric heating rod during the installation of the piston, and other tools cannot be used to replace the electric heating rod to forcibly tighten the bolts; after the piston is installed, the flexibility of the connecting rod swing should be checked to ensure that the connecting rod swings flexibly.

(7) Main points of other components installation

The reciprocating compressor has a complicated structure and many parts. Pay attention to the main points of the installation of each part during installation. When installing the oil wiper, pay attention to the direction of the cutting edge of the oil scraper ring and make sure that the cutting edge of the oil scraper ring faces the machine body. When installing the air valve, all parts of the air valve should be cleaned in all directions, and the sealing surface of the air valve should be protected and make sure that the suction and exhaust valves are installed correctly in accordance with the operating specifications. The installation of auxiliary equipment, such as buffers, separators, etc., should be operated in accordance with the construction drawings. Since the reciprocating compressor is prone to producing air pulsation, which will cause pipeline vibration, so the pipeline support should have reliability and anti-vibration ability to prevent pipeline vibration.

In short, reciprocating compressors should strictly follow the corresponding standards and continuously optimize their design, installation, and maintenance. The quality of the installation will affect the normal operation and service life of the equipment. The installation must be strictly checked to ensure that the installation quality meets the national specifications and the manufacturer's requirements and hence improve the installation quality.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best gas compressor manufacturers.

Countermeasure for Problems in Reciprocating Compressor(2021年08月12日)

aipucompressor — 2021-08-05T18:38:04+0900

https://www.aipucompressor.com/products/

For the types of problems in the faults of reciprocating compressors' thermal performance, the main ones are insufficient displacement and abnormal temperature.

The countermeasures for reciprocating compressors' thermal performance problems are as follows.

① For insufficient displacement:

a. If the intake air filter fails, the filter should be cleaned regularly to clean the dirt on the valve plate, which is beneficial to the air reciprocating compressor to maintain normal air displacement. Under normal circumstances, the filter should be cleaned every 200 hours, and the air valve should be cleaned every 500-800 hours.

b. Cylinders, pistons, and piston rings are severely worn out of tolerance, and the related clearance and leakage will be increased, which affects the displacement. For normal wear, the wearing parts, such as piston rings, should be replaced in time. If the installation is improper or the clearance is inappropriate, it should be corrected according to the drawings; if there is no drawing, the clearance between the piston and the cylinder should be along the circumference according to the experience data. When it is a cast iron piston, the clearance should be 0.06%- 0.09% of the cylinder diameter; when it is an aluminum alloy piston, the clearance should be 0.12%-0.18% of the cylinder diameter; if it is a steel piston, the clearance can take the smaller value of the clearance of the aluminum alloy piston.

c. The cng compressor speed is reduced, because the air reciprocating compressor's discharge capacity is designed according to a certain altitude, suction temperature, and humidity. So all its use in plateaus that are not exceed the standard of the design will not cause the suction pressure to decrease and make the discharge reduce.

d. The quality of lubricating oil is not good. High-quality lubricating oil should be selected. After long-term work, the lubricating oil will contain impurities and dust, which must be filtered. In general, the oil should be changed every 500-800 hours and the oil used last time should be filtered.

② For abnormal temperature:

a. The inter-cooling efficiency is low, or the scale in the inter-cooler affects heat exchange, and the suction temperature of the latter stage will inevitably increase, so the exhaust temperature will also increase.

b. Air valve leakage and piston ring leakage will not only affect the increase of exhaust temperature, but also change the pressure between stages. If the pressure ratio is higher than the normal value, the exhaust temperature will increase.

c. The exhaust temperature of the water-cooled compressors will increase when there is water shortage or insufficient water.

The main types of faults of reciprocating compressors' mechanical function:

(1) Abnormal vibration and noise;

(3)Overheating.
Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best oil and gas compressor manufacturers.

Overview of Operation and Structure of Liquefied Oil and Gas Compressor(2021年08月06日)

aipucompressor — 2021-08-05T18:37:24+0900

https://www.aipucompressor.com/

Liquefied oil and gas compressors are mainly used for the transportation and boosting of liquefied oil and gas or gases with similar properties. Therefore, this type of compressors are the key equipment for liquefied oil and gas stations, LPG car refueling stations, and mixed gas stations as well as the ideal equipment for boosting and recovering gas for the chemical industries.

1. Operation of liquefied oil and gas compressor
(1) Loading and unloading of liquefied oil and gas tankers, fire tanks and tankers;

(2) Bottling and canning liquefied oil and gas or gas with similar properties;

(3)Recovering of residual gas or residual liquid of liquefied oil and gas;

(4)The compression medium of special compressors that are for the production of chemical products can be divided into liquid ammonia, diformaldehyde, propylene, propane, butadiene, vinyl chloride, methane.

2. Overview of the structure of the liquefied oil and gas compressor
The cylinders and packing parts of the liquefied oil and gas series compressors produced by good liquefied oil and gas compressor manufacturers should all be oil-free, because this ensures the purity of the medium during operation. The crankshaft, connecting rod and cross-head parts are splash lubricated to ensure the reliability of movement.

Liquefied oil and gas compressors can be divided into vertical, single-acting, air-cooled and oil-free lubrication, reciprocating piston structure, high efficiency filter, gas separator, two-position four-way valve, pipeline system, explosion-proof motor, etc. The protection system is composed of shut-off valves, floats, safety valves, etc. It has its own complete system. Users do not need to equip additional equipment such as gas-liquid separators, surge tanks, etc., and can simplify the configuration of pipeline valves. Liquefied oil and gas compressors have the characteristics of low vibration, low noise, stable operation, compact structure, large displacement, convenient operation, safety and reliability, low investment, quick effect, etc.

Turning the handle of the two-position four-way valve of the compressor, the unloading state can be conveniently changed to the residual gas recovery state, and the operation is very convenient.

Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best gas compressor manufacturers.

Introduction of the Pressurization Station Natural Gas Compressor(2021年08月05日)

aipucompressor — 2021-08-05T18:36:39+0900

https://www.aipucompressor.com/

Natural gas is flammable and explosive, so its main risks are the risk of explosion caused by natural gas leakage and air entering the compression system as well as physical explosion caused by over-pressure. When the compressor lubricating oil supply is insufficient and the oil level in the crankcase is reduced, it will cause poor lubrication, increase the oil temperature, and result in accidents such as tile burning and piston jamming. If the oil is added too much, excess oil will flow into the combustion cavity during operation, which will cause backlog. And the equipment will not work properly.

In addition, whether the water quality meets the standard has a long-term impact on the safe operation of the compressor unit. Poor water quality will cause corrosion and blockage of the fuselage, cylinder block, pipeline, etc., and the equipment will even be scrapped in severe cases.

The following is to identify the possible dangers in accordance with the equipment, environment and personnel activities in the production process of the natural gas compressor of the pressurization station.

1. Production equipment and environment of pressurization station
(1) The core equipment of the pressurization station is the natural gas compressor and attached gas engine, air cooler, etc.;

(2) Auxiliary equipment includes installation of cranes, fire water pipelines and hydrants, combustible gas detectors, video surveillance cameras, lighting facilities, axial fans and other auxiliary facilities for the overhaul of compressors in pressurization stations;

(3) The workshop adopts color steel tile and steel beam shed structure;

(4) Equipment that may be used in the maintenance of pressurization station equipment; generators, cranes, and transportation vehicles used by construction units; electric welders and gas welding for professional maintenance; cameras and video cameras carried by outside visitors.

2. Pressurization station personnel and main work activities
(1) The inherent production duty and management personnel of the pressurization station, external inspection visitors, construction personnel on site, professional maintenance and repair operations personnel, new employees or trainees and external equipment commissioning personnel, etc.;

(2)The main work activities include post inspection, process switching, equipment start (stop) operation; equipment maintenance, regular inspection, maintenance and repair operations; fire fighting, rescue and disaster relief.

3. Risk identification direction of recycle gas compressor in pressurization station
(1) Fire of natural gas compressor system;

(2) Mechanical damage;

(3) Noise;

(4) Lubrication;

(5)Temperature.
Bengbu Aipu Compressor Manufacturing Co., Ltd. was founded in June 2002 relying on such location advantages which is one of the best oil and gas compressor manufacturers.