1. Preparation for start-up
(1) Clean up the site, unscrew the screws of the bearing seat, and add thermal oil as lubricating oil.
(2) Move the coupling pump by hand, it should rotate flexibly.
(3) Before starting the pump, it should be filled with the heat transfer oil to drive out the air in the heat transfer oil pump, and the gate valve on the pipeline should be closed at this time.
(4) the conveyed thermal oil should be uniformly heated before driving, preheating is carried out by using the conveyed thermal oil continuously through the pump body. Preheating standards: thermal oil pump pump casing temperature shall not be lower than the inlet oil temperature of 40 ℃, preheating rate of 50 ℃ / hour, in the start-up preheating should be the pump legs on the side of the nut should be loosened 0.3-0.5 millimeters, preheating is completed should be tightened.
2. Start-up
(1) Comprehensively check whether the preparatory work is perfect.
(2) Turn on the power, when the heat-conducting oil pump reaches the positive speed, and the instrument shows a considerable pressure, gradually open the gate valve on the output pipeline, and adjust it to the required working condition. If the gate valve on the output pipe is closed, the pump should not work continuously for more than 3 minutes.
(3) in the initial operation of 3-4 hours, after the equipment is heated to operating temperature, turn off the thermal oil pump, check the thermal oil pump pump shaft and motor coupling coaxiality of the pump shaft and motor shaft deviation should be controlled within the allowable range, the pump shaft should be rotated by hand to be light, flexible and vibration-free rotation, such as failing to meet the above requirements should be re-adjusted.
(4) during the start-up process, we should always pay attention to the power reading and vibration of the motor, the vibration value does not exceed 0.6 mm, if abnormal should be shut down for inspection.
Matters that should be noted when overhauling hot oil pumps
The overhaul of hot oil pumps, if possible, it is best to read through the manufacturer's maintenance manuals and general assembly drawings, to see what special places need attention.
I. Disassembly:
1. Before disassembling the thrust bearing should be used to measure the balance disk clearance, and make a record;
2. Hot oil pump disassembly must be the parts in the original assembly order of marking, so as to avoid confusion when the return to the installation, the wrong installation;
3. It is not easy to do the marking of small parts (such as the key) can be placed together with the same level of the impeller or the guide vane (in the middle section), and so on.
4. When disassembling, you can intuitively feel whether there are abnormal parts, such as loose fit.
II. Parts overhaul:
1. Visual inspection of the parts surface is normal, the mating surface must be free of bumps and scratches, no corrosion, etc.;
2. Measurement of key mating parts with the gauge tolerance is qualified;
3. Measurement of the impeller sealing ring, shell sealing ring, the guide vane sealing ring, the interstage bushings, etc., whether the gap is in tolerance, the wear and tear of the need for replacement;
4. Check whether the bearings are intact;
5. All seals and gaskets should be replaced with new ones;
three. Back to install:
1. First, install the rotor, re-carry out the dynamic balance test;
2. According to the reverse order of dismantling the pump back to install the parts, back to install, pay attention to the amount of each sealing ring at the gap value again, to ensure that there is no error;
3. Before installing the balance disk should be measured before the total amount of the rotor strings;
4. After the installation of the balance disk, the measurement of the rotor half string amount.
5. With the manufacturer's general assembly drawing of the total string quantity and half string quantity required to compare, should be basically in line with the drawing requirements. Generally speaking, the half string quantity is about half of the total string quantity.
6. Uniformly tighten the main bolts, pay attention to the angle should be carried out;
7. In the shaft suction a piece of percentage meter, rotating the shaft of the balance disk to play the table, tolerance according to the requirements of the drawings, generally shall not exceed 0.06;
8. Installation of thrust bearings should pay attention to adjusting the balance of the disk clearance should be used in front of the bearing adjusting ring will be adjusted to balance the disk clearance to the requirements of the drawings.