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11

2023

Tee processing technology

1. Hydraulic bulging The hydraulic bulging of the tee is a forming process that uses a specialized hydraulic press to expand the branch pipe through axial compensation of the metal material. 2. Hot pressing forming The entire process is formed through the radial compression of the damaged pipe and the stretching process of the branch pipe. So it is also known as radial compensation process

11

2023

Selection and purchase of tee fittings

1. Firstly, determine whether the controlled medium is oil or water 2. Calculate the flow rate of the controlled medium in m3/h. 3. Select the diameter of the three-way temperature regulating valve based on the controlled medium and its designed flow rate 4. Determine the model of the three-way regulating valve based on the valve body material, connection form, valve structure type, temperature regulation range, and installation type. 5. According to the different flow directions of the three valve ports, the three-way regulating valve can be used for confluence or diversion control situations 6. The difference between a combined three-way temperature regulating valve and a split three-way temperature regulating valve is to choose a suitable temperature regulating valve according to needs 7. A three way temperature regulating valve can replace a two way valve and a three way connecting pipe 8. There are six installation types of rotary valve type three-way temperature regulating valves, which are suitable for connection in any pipe direction. The installation type is selected based on the actual pipeline connection of the system. 9. The three-way temperature regulating valve can be installed in any position, but the emergency manual device surface should be installed in a convenient position for operation. 10. To prevent impurities in the medium from getting stuck or blocked, a filter should be installed in front of the three-way temperature regulating valve.

11

2023

Tee connection method

1. Broken pipe According to the on-site surveying and mapping sketch, connect the selected pipes to the national line and cut them according to the line 2. Threading Thread the broken pipe in stages according to the pipe diameter size. Generally, threading should be done twice for pipes with a diameter of 15-32mm, three times for pipes with a diameter of 40-50mm, and 3-4 times for pipes with a diameter of 70mm or more 3. Fitting fittings According to the on-site surveying sketch, assemble the threaded pipes and fittings. 4. Pipe section straightening Straighten the installed pipe section before installation. It is not allowed to damage the pipe section during straightening.

11

2023

What are the commonly used pipe fittings

Welded pipe fittings: Pipe fittings connected to pipes by welding, including elbows, flanges, tees, reducers, heads, etc Threaded pipe fittings: They are threaded pipe fittings commonly used for water and gas pipes, small diameter water pipes, compressed air pipes, and low-pressure steam pipes. Ferrule fitting: It is a new type of fast pipe fitting with good sealing performance and can be reused. It is suitable for pipeline systems with oil, gas, and general corrosive media. Clamp pipe fittings: used for tightening the connection between quick couplings, including clamps, quick fittings, silicone sealing washers, chuck blind plates, etc. Pipe fittings: A high-pressure pipeline connection accessory formed by forging and forging round steel or steel molds, and machined by a lathe. Curved double fusion pipe fittings: pipe fittings with ports of the same size as the pipe to be connected, which are connected through hot melt butt welding. Adhesive pipe fittings: Pipe fittings that are connected using solvent based adhesives, such as PVC plastic pipes. Rubber ring connected pipe fittings: composed of the main body of the pipe fittings, sealing end caps, and sealing rubber rings.

11

2023

Common dimensions of threaded pipe fittings

1. Single head threaded nipple: nominal diameter DN 8/10/15/20/25/32/40/50 NPS 1/4, 3/8, 1/2, 3/4, 1, 1.1/4, 1.1/2, 2. Outer diameter D13.5.17.2, 21.3, 26.7, 33.4, 42.2, 48.3, 60.3. L is 60, 90, 120, 150, 180 2. Flat head outer thread (short pipe): nominal diameter DN 8/10/15/20/25/32/40/50, NPS1/4, 3/8, 1/2, 3/4, 1, 1.1/4, 1.12, 2. The outer diameters of D13.5, 17.2, 21.3, 26.7, 33.4, 42.2, 48.3, and 60.3 L are 60, 90, 120, 150, and 180. 3. Double threaded nipple: nominal diameter DN 8/10/15/20/25/32/40/50 NPS 1/4, 3/8, 1/2, 3/4, 1, 1.1/4, 1.1/2, 2. Outer diameter D13.5 17.2, 21.3, 26.7, 33.4, 42.2, 48.3, 60.3. L is 60, 90, 120, 150, 180. 4. Hexagonal head pipe plug: nominal diameter DN 6/8/10/15/20/25/32/40/50/65/80/100 NPS 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1.1/4, 1.1/2 2. 2.1/2,3,4. Thread length L2min9.5, 11.0, 12.5, 14.5, 16.0, 19.0, 20.5, 20.5, 22.0, 27.0, 28.5, 32.0. 5. Square head pipe plug: Square head height B min6, 6, 8, 10, 11, 13, 14, 16, 17, 19, 21, 25. Plane width C min7.0, 9.5, 11.0 14.5, 16.0, 20.5, 24.5, 28.533.5, 38.0, 43.0, 63.5. 6. Round head pipe stockade: Round head diameter D10, 13, 17, 21.27.33, 43, 48, 60, 73, 89, 114, total length Lmin35.41 41.44.44 51, 51, 51, 64, 70, 70, 76. 7. Hexagonal head pipe plug and joint: flat width S11.0, 16.0, 17.5, 22.0, 27.0, 35.0, 44.5, 51.0, 63.5, 76.0, 89.0, 117.5. Hexagonal height Kmin -, 3, 4, 5, 6, 7, 8, 9, 10, 10, 13Hmin6, 6, 8, 9, 10, 10, 14, 16, 17, 19, 21, 25

09

2020

Our main products

Our products include ball valve, ball valve, ball valve, ball valve, ball valve, ball valve, ball valve, ball valve.

09

2020

Enterprises always adhere to the principle, there is no permanent characteristics, only continuous innovation "enterprise spirit

Enterprises always adhere to the principle, there is no permanent characteristics, only continuous innovation "enterprise spirit

09

2020

Selection, use and maintenance of centrifugal pump

1. Selection and installation of centrifugal pump Centrifugal pump should be selected according to the liquid delivered, and check the required performance, analyze the suction and discharge conditions, whether intermittent or continuous operation, etc. The centrifugal pump shall normally operate at or close to the pressure and flow conditions specified by the manufacturer. The following rechecks shall be carried out during pump installation: (1) the size, position and elevation of the foundation should meet the design requirements. The anchor bolts must be properly and correctly fixed in the concrete foundation. The machine should not be missing, damaged or rusted; (2) according to the characteristics of the medium delivered by the pump, the material of main parts, shaft seals and gaskets should be checked if necessary; (3) the leveling and alignment of the pump shall comply with the provisions of the technical documents of the equipment. If there is no regulation, it shall comply with the provisions of the current national standard "general code for construction and acceptance of mechanical equipment installation engineering"; (4) the installation of all pipes and fittings connected with the pump body and the cleaning requirements of lubricating oil pipes shall comply with relevant national standards. 2. Use of centrifugal pump The test run of centrifugal pump shall meet the following requirements: The steering direction of the driving machine should be the same as that of the pump; (2) find out the steering direction of pipeline pump and coaxial pump; (3) each fixed connection part shall be free from looseness, and the specification and quantity of lubricant applied to each lubricating part shall comply with the provisions of technical documents of the equipment; (4) parts with pre lubrication requirements shall be pre lubricated according to regulations; (5) all indicating instruments and safety protection devices shall be sensitive, accurate and reliable; (6) the turning gear should be flexible without abnormal phenomenon; (7) the pump body shall be preheated before the test run, and the temperature shall rise evenly, and the temperature rise shall not be greater than 50 ℃ per hour; the temperature difference between the pump body surface and the process pipeline with working medium inlet shall not be greater than 40 ℃; (8) set up connection device to eliminate the influence of temperature rise, and set bypass connection device to provide cooling water source. Centrifugal pump operation should pay attention to the following points: (1) it is forbidden to operate without water, do not adjust the suction population to reduce the displacement, and it is forbidden to operate under low flow rate; (2) monitor the operation process to prevent the leakage of the stuffing box, and use new packing when replacing the stuffing box; (3) ensure that the mechanical seal has sufficient flushing water flow, and excessive water flow is prohibited for water-cooled bearings; Do not use too much lubricant; (5) check according to the recommended period. Establish operation records, including operating hours, packing adjustment and replacement, lubricant addition and other maintenance measures and time. The suction and discharge pressure, flow rate, input power, temperature of washing liquid and bearing and vibration of centrifugal pump should be measured and recorded regularly. (6) the main engine of the centrifugal pump pumps the water from the low place to the high place by relying on atmospheric pressure, which can only support about 10.3M water column at most, so the main engine of the centrifugal pump cannot work when it is 12 meters away from the water surface. 3. Maintenance of centrifugal pump 3.1 failure analysis of centrifugal pump mechanical seal The shutdown of centrifugal pump is mainly caused by the failure of mechanical seal. The performance of failure is mostly leakage, and the leakage causes are as follows: The main reasons for the leakage of the sealing surface of the dynamic and static rings are as follows: the flatness and roughness of the end face do not meet the requirements, or the surface is scratched; there is particulate matter between the end faces, which causes the two ends of the seal surface to not run the same way; the installation is not in place and the way is incorrect. The main reasons for the leakage of the compensation ring seal ring are: the gland is deformed, the preload is not uniform, the installation is not correct, the quality of the sealing ring does not meet the standard, and the type selection of the sealing ring is not correct. The practical application results show that the most failure parts of the sealing elements are the end faces of the dynamic and static rings. The cracking of the end faces of the static rings is a common failure phenomenon when the centrifugal pumps are sealed (1) during installation, the clearance between the sealing faces is too large, and the flushing

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