In this sequence, we will introduce typical marine use. Pumps such as horizontal volute, vertical volute gear, one screw three rotor screw steam turbine driven cargo and lng pumps. Horizontal volute pumps are relatively small. They are mainly used as fresh water and sea water service pumps. Relatively larger, vertical volute pumps are used as main sea, water pumps, cooling, fresh water pumps, general service pumps and ballast pumps, since both types work. Basically, in the same way, we will focus our explanation on vertical volute pumps, many of which are large rotation of the impeller, creates a vacuum at the center of the impeller, allowing the liquid to be drawn in through the pump inlet given pressure and velocity energy by Centrifugal force the liquid is pushed out through the outlet. Such repetition of suction and expulsion allows the liquid to be pumped shown here are the main components of the volute pump. The shaft mechanical seal, impeller and mouth ring. Some vertical shaft pumps have a bottom sleeve. Let’S. Look at these components, one by one in their assembly process. This is a large bilge fire. General service pump, a vertical two stage: single suction type pump. The shaft with an impeller is fitted in the mouth ring is attached. The coupling is connected with pumps that have no line bearing at the bottom alignment is fixed by motor coupling connection. The bottom sleeve is attached, the mechanical seal is already fixed on the shaft. The packing is applied, the pump cover is installed, the shaft begins to rotate smoothly.
Here you can see the mechanical seal parts, they are the floating seat, o ring seal ring spring and stopper ring the mechanical seal, keeps air tightness by a combination of sealing in the shaft direction by the shaft, fixed, o ring and sealing in the radial direction by The sliding of the seal ring and floating seat key points for maintaining mechanical seal functions are that the o ring does not deteriorate the spring, which presses the sliding surface functions. Well, the floating seat. Sliding surface has good durability, flushing liquid used for cooling and cleaning the seal part keeps flowing the following: veloute pump cases of trouble have been reported damage to the bearing damage to the mechanical seal damage to the impeller and mouth ring due to cavitation wear of the Casing and uneven wear of the bottom sleeve if the pump is vertical with a bottom sleeve, the following precautions must be taken in operating volute pumps, consider replacement of ball bearings depending on duration of operation. Beware of negative pressure operation to prevent cavitation during operation. Beware of leakage from the gland when using a mechanical seal, beware of damage to the seal and confirm that the flushing liquid is flowing and the mechanical seal part is clean, keep pressures always in mind and make a maintenance plan as necessary if a comparison of characteristic Curves indicates a decline in pump performance and, with regard to a vertical pump, pay attention to vibrations that may affect shaft alignment.
Music gear pumps are mainly used as fuel oil and lubricating oil pumps. Music rotation of the main drive shaft moves a space created between the drive and driven gears, thereby allowing a highly viscous liquid to be carried from the pump inlet to the outlet shown here are the main parts of the gear pump. They are the drive, shaft drive gear, driven gear bearing mechanical seal oil, seal and relief valve. An oiler is attached to gear pumps and three rotor screw pumps with the oiler. An oil chamber is provided on the atmosphere side of the mechanical seal into which lubricating oil is sealed to cut the atmosphere off the sliding surface. This prevents fuel oil leaking out of the mechanical seal from solidifying, replace lubricating oil if it has discolored and the oil level has risen beyond a specified level. The following cases of trouble with gear pumps have been reported damage to the bearing leakage due to damage to the mechanical seal leakage due to damage to the oil seal and damage to the gears. The following precautions must be taken to operate gear pumps and conduct maintenance, open inlet and outlet valves before starting the pump draw out air before starting the pump pay attention to any vibrations and abnormal sounds be mindful of bearing temperatures prevent contamination by foreign matter. Beware of leakage from ceiling, understand, pump performance capabilities, carefully, conduct, inspection and adjustment of the shaft alignment, do not conduct dry operation and if an oiler is provided, pay attention to any rise in the oil level and replace lubricating oil as necessary.
According to changes in its color, there are two types of screw pump, one screw and three rotor screw. The structure of the one screw pump is like this components are the oil seal bearing shaft universal joint steeder and rotor Music? The one screw pump is a kind of displacement screw pump and consists of a stator and rotor. If the rotor of a single threaded male screw is turned inside a double threaded female screw stator, the rotor turns inside the stator. The stator is made of a flexible material and the rotor continuously moves from one space to another as produced between the rotor and stator. This is how pump action occurs and its continuous movement transfers bilge containing foreign matter, as well as viscous liquids. The three rotor screw pump consists of one power rotor housed in a casing and two idler rotors that are meshed with the power rotor Music main parts are the bearing oil seal, mechanical seal stator power, rotor, idler, rotor and casing. When the power rotor is turned clockwise. As seen from the drive side, the idler rotors turn in the opposite direction. This creates a sealed space per screw lead. It moves toward the discharge side along the screw. Shaft typical reported cases of trouble with screw pumps have concerned, overheating of and damage to bearings be mindful of the following points: the rise in bearing temperatures preventing air from entering keeping pumping capacity and pressure within prescribed levels, clogging of the suction tube and strainer maintenance of The oiler and mechanical seals flushing function in the case of three rotor screw pumps and avoidance of dry operation.
Music steam turbine driven cargo oil pumps are used on crude oil tankers with its steam turbine side placed in the engine room. The cargo oil pump proper is installed in the pump room via seals for the gear coupling and penetrating parts. This isolation is necessary from the viewpoint of hazardous material handling, Music. The cargo oil pump is a kind of volute pump liquid, which has been sucked in from the pump’s inlet. Thanks to the impeller rotation is given pressure and velocity energy and is delivered continuously from the discharge port. Here you can see the cargo oil pumps main parts as a large, double suction pump. The cargo pump has a mouth ring, mechanical seal and bearing one set each on both sides of the impeller. The mouth ring and impeller peculiar to volute pumps are installed side by side, with a very small gap between them, thereby preventing the high pressure liquid from flowing backward. The following are typical: reported cases of trouble with cargo oil pumps, damage to bearings, damage mainly cracking to the casing, etc. Damage to mechanical seals, damage to the gear, coupling and wear of the bottom sleeve Music. The following precautions must be taken to operate and maintain cargo oil pumps, conduct steam turbine warming. Governor and shutoff tests maintain the optimum pump operational range and strictly adhere to the recommended pipe flow. Velocity never open or close valves abruptly when starting or stopping the pumps prevent suction pressures from falling, prevent bearing temperatures from rising overly high check, oiling points of gear, coupling before lubricating check leakage from mechanical seal and beware of vibrations caused by poor alignment.
The pump for lng cargo handling is a submerged pump that can be found at the bottom of an lng tank. The motor is made of a special cryogenic metal because it is also submerged in the lng liquid with the boiling point at 162 degrees celsius are lng, pumps, main parts, the discharge cover bearing shaft, winding rotor, stator, Music pump, casing, impeller, suction cover and inducer lng. Liquid is drawn into the impeller via the inducer, located at the bottom of the pump. It then passes around the motor goes through a check valve and is discharged into the upper part of the pump. Sufficient attention must be paid to the handling of lng pumps, because problems with these pumps can be severe, causing serious damage to the impeller, for example, to operate, lng pumps, sufficient attention and expert skills are indispensable, while keeping cargo conditions in mind. Points to consider are beware of cavitation. The maintenance of proper npsh do not restart the pump while it’s idle due to low current, do not use the pump depending on the state of gas.