Buried all-welded ball valve installation and maintenance
1.1 Buried All-Welded Ball Valves Pre-installation pressure test pipeline valves before installation should be pressure tested to ensure the tightness and safety of the valve itself. (1) strength test. Strength test using water as a medium; welded on the sleeve on both sides of the valve pressure - Du Cap. After the valve is opened to 45 degrees Celsius, water is injected into the ball valve through the pressure test valve on the sleeve. Boost to 1.5 times the nominal pressure of the ball valve, packing 15min; no leakage as qualified. (2) Tightness test. Tightness test using nitrogen as a medium; the ball valve closed. Pressure test valve from the sleeve to the valve into the nitrogen. The pressure rose to 1.1 times the nominal pressure of the ball valve, and the pressure relief valve connected to the tube through the water container for testing. Insert depth of 1cm; 5min no air bubbles generated as qualified. 1.2 Installation (1) hoisting. Valve should be lifted in the correct manner, in order to protect the valve stem, do not tie chain hanging in the hand wheel, gear box or actuator. Valve caps at both ends of the protective cap should not be removed before welding. (2) welding. Buried all-welded ball valve and the main pipeline to take the welding connection. Weld quality must meet the "flexo fusion welded joint radiography" (GB3323-2005) Ⅱ level standard, usually a welding and can not fully guarantee all qualified, so when ordering the valve should require manufacturers to add 1.0m long at both ends of the valve Sleeve, once the weld fails and there is enough length will be unqualified Weld cut and re-welded In the ball valve and pipe welding, the valve should be 100% open position, so that the ball is spattered slag splash damage, while ensuring Valve internal seal temperature does not exceed 140 degrees Celsius, if necessary, can take appropriate cooling measures. (3) valve well masonry. Buried all-welded ball valve with a special structural design, with maintenance-free features, before the outside of the valve coated with Pu special anti-corrosion coating, while the three were the valve seat and stem emergency injection of fat in the tube Exhaust pipe and valve chamber according to the depth of Huangdi appropriate extension, so that staff can complete the operation on the ground. To achieve direct burial, masonry small valve hand wells can be, as shown in Figure 4. For conventional non-fully welded ball valves can not be buried directly, and the need to build large valve wells, the result has been the formation of a dangerous confined space, is not conducive to safe operation. At the same time the body itself and the valve body and pipe bolting parts will be subject to corrosion, affecting the life of the valve. 2 daily operation and maintenance In order to extend the life of the valve, usually should follow the following procedures for valve operation and maintenance. 2.1 Buried all-welded ball valve valve operation often can prevent the impurities in the valve seat or ball surface accumulation, but also to avoid excessive wear and tear of the valve seat inlay. (1) opening and closing time requirements. Valve switching too fast will cause the valve distortion load is too large. Leaving the valve stem damaged; switch is too slow will result in a longer seat surface erosion by the media and wear. The operating time should therefore be kept within a suitable range. As a rule of thumb, the range of valve switching times (seconds), the lower limit can be half the nominal valve size (in.) And the upper limit can be approx. 5 times the nominal valve size (in.). (2) valve is put into operation state, valve ball should be fully open or fully closed, shall not be half open or half off position, so as to avoid seat damage. 2.2 Routine Maintenance The valve seat cavity is the most easily contaminated area of ​​pipeline valves. To ensure that the valve seat is free to move, clean it once a year and periodically check the tightness of the valve through the blowdown nozzle. Valve auxiliary gas lines are often rarely adjusted every year at least once the switch and inject the right amount of grease to prevent the ball and seat gluing and the ball between the valve seat and the sub-mill. The good technical features of the buried fully welded ball valve make the entire gas pipeline work together (all welded together), enhancing the overall stress resistance of the pipeline (including the valve) and the capability of preventing geological disasters (such as geological collapse). Reduce the possibility of air leaks. Valve reliability to improve life expectancy, installation and maintenance is also very convenient.
Artificial lift is a method used to lower the producing bottomhole pressure (BHP) on the formation to obtain a higher production rate from the well. This can be done with a positive-displacement downhole pump, such as a beam pump or a progressive cavity pump (PCP), to lower the flowing pressure at the pump intake.
Artificial lift is needed in wells when there is insufficient pressure in the reservoir to lift the produced fluids to the surface, but often used in naturally flowing wells (which do not technically need it) to increase the flow rate above what would flow naturally.
Artificial Lift,Hydraulic Pumping Units,Oilwell Well Pumping Units,Walking Beam Pumping Unit
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