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1、管道工复习资料A review of information1. what assignments should not be carried out by one person alone?Answer: in the water tower, into the pool and water wells, inspection wells, lifting, lifting, maintenance, electrical equipment and other dangerous operations, shall not be carried out alone.2. Water sup
2、ply pipelines and other horizontal distance are required?Answer: 1 meters to the water pipe, 1.5 2 meters drain pipe, power cable 1 meters, communication (pipe) cable 1 meters, lighting, communication rod 1 meters, heat pipe 1.5 meters, gas pipe 1.5 meters3. how is the sanitary protective belt for s
3、urface water supplied as a source of drinking water?Answer: water points around the radius of 100 meters in the waters, fishing boats docked, prohibited, swimming and water pollution may engage in any activities, and the water supply unit set a clear range marks and signs prohibited matters. The wat
4、er intake point is from 1000 meters upstream to 100 meters downstream, and shall not be discharged into industrial waste water and domestic sewage and piled up harmful substances.4. The groundwater sources of drinking water for health protection zone is provided?Answer: within the radius of a single
5、 well or well group, industrial waste water or domestic sewage shall not be used for irrigation and the use of persistent or highly toxic pesticides. Wells around 30 meters, the clear water tank (tank Hill) around 10 meters range, shall set the toilet water seepage, seepage pit, cesspool, garbage an
6、d waste and other pollution sources.Storage and transfer of materials and tools 5. Work should pay attention to what matters?Answer: (1) materials and tools shall not be stored near the wellhead. (2) scattered tools and materials shall be placed in a tool bag or cage. They shall be hung or tied up w
7、ith ropes, and shall not be carried by hand or delivered by hand. Before the rope is used, it must be checked, and the assembly and disassembly of the well are heavier.6. what climate should be avoided when repairing the top of a water tower?Answer: avoid wind, rain, snow and freezing.7. what are th
8、e connecting ways of the water supply pipeline?Answer: water supply pipeline connections are: socket type steel interface, socket type flexible interface, welding interface, flange interface, pipe expansion interface, thread connection, etc.8. what safety matters should be paid attention to when pla
9、cing pipes?Answer: pipe shall not be piled on the slope to prevent sliding along the slope. When piling up, the socket and socket shall be placed interactively and arranged evenly, and the sides shall be firmly supported by wood piles.9. what are some commonly used pipes for Sheung Shui?Answer: comm
10、only used pipes are cast iron pipes, steel tubes, rigid PVC pipes.What are the 10. threaded fittings?Answer: threaded pipe fittings can be divided into pipe joints, internal and external wires, movable joints, elbows and three links according to their uses.11., excavation pipe ditch safety precautio
11、ns?Answer: according to the soil and groundwater conditions, buried depth of the pipeline, construction conditions and so on, choose rectangular, trapezoidal, mixed groove surface shape, such as soil quality is not good, the condition is not allowed to be equipped with sheet pile support. Trenches d
12、ug out of the soil piled up 1 meters away from the ditch slope of the site, is strictly forbidden to dig holes, in case the collapse wounding.12. what are the quality requirements after the pipe sleeve?Answer: (1) the pipe must be in accordance with the requirements of the wire length. (2) the wire
13、surface of the pipe shall be 90 degrees to the central line of the pipe. (3) there is no deformity or deformity between the filaments. (4) the front end of the wire head is 2/3.ThirteenWhat are the live joints made of?A: the movable joint is made up of two main sections, a live cap and a rubber ring
14、 (rubber, rubber asbestos board).14. pipeline laying is divided into several types?Answer: pipeline laying is divided into buried, concealed and Ming three, buried pipe top, cover the soil; concealed refers to the pipe ditch, the ditch surface with a cover; Ming refers to the pipe is installed on th
15、e ground or pipe rack.15., laying the pipeline should be generally distance from the building foundation, how many meters?Answer: laying the pipeline near the building, should be 3 meters away from the building foundation, but the pipeline buried depth of more than 2.5 meters, and the building of th
16、e base line distance shall not be less than the depth of one meter.16. what causes leakage of water pipes?Answer: (1) joint loosening; (2) water pressure is too high; (3) water hammer impact is too large; (4) pipeline corrosion (5) heavy impact; (6) pipe subsidence; (7) frost damage; () frost damage
17、.What are the 17. The pipeline and water hydrant security facilities?Answer: (1) according to the needs, should install safety valve, water hammer eliminator, relief valve, exhaust valve, mud valve, telescopic pipe. (2) the underground pipeline shall be provided with a complete and correct water cha
18、nnel. (3) all kinds of water hydrants in cold areas should be equipped with anti freezing devices. (4) no pressure fire hydrant fire hydrant cover, there should be convenient fire channel.18. how is the test standard for common pipe pressure set?Answer: test pressure requirements (unit MPa) (1), cas
19、t iron pipe work pressure plus 0.5, when the work pressure is less than 0.5, the pressure is 2 times the work pressure. (2) the work pressure of the steel pipe is increased by 0.5, but not less than 1. When the pressure drop value is not more than 0.05 within 10 minutes, it is qualified for the test
20、.The operation time was 19. Water supply construction plans of how to determine?Answer: (1) according to the size of the construction work and the degree of difficulty in the operation to determine. (2) determine according to the number of participants. (3) consider how many construction tools and m
21、aterials are needed.20. What is the automatic feed water control?Answer: automatic control is the use of mechanical, electrical, optical and other device to replace the manual control organ function in water, without artificial directly involved in the case, can automatically realize the predetermin
22、ed feedwater control process.The general automatic control system is composed of several parts 21. Water supply?Answer: water supply automatic control system is usually composed of control object, measuring transmitter, controller and executive device.Commonly used instruments and equipment 22. Seve
23、ral kinds of automatic control of water supply?Answer: (1) process parameter detection instrument: including turbidity, pH value, pressure, level, flow, current and so on. (2) process control instrument. Various controllers based on microcomputer, such as microcomputer control system, programmable l
24、ogic controller, microcomputer regulator and so on. (3) adjustment control of the implementation of equipment. Including a variety of pumps, solenoid valves, regulating valves and frequency converter. (4) other mechanical and electrical equipment. Such as AC contactor, relay, recorder and so on.23.
25、Electromagnetic flowmeter is composed of several parts?A: the electromagnetic flowmeter consists of two parts, the transmitter and the converter. The transmitter is installed in the pipeline of the medium to be measured, and the flow of the measured medium is changed into an instantaneous electrical
26、 signal;The converter converts the instantaneous electrical signal to a uniform standard DC signal of 010mA or 420mA for the purpose of indicating, recording, or regulating the instrument.24. Water supply automatic control purposes?Answer: by improving the automation level of water works, the modern
27、 management level of the water plant and the ability of air conditioning in the production process can be improved, so as to improve the social and economic benefits of waterworks production.25. The function of automatic control system of water supply?Answer: (1) water quality optimization. (2) ener
28、gy consumption optimization. (3) optimization of monomer structure operation.26. Preparation of chlorine dioxide technology is divided into several categories?Answer: divided into three categories: chemical method, electrolysis method and stability chlorine dioxide activation method.The production o
29、f chlorine dioxide 27. Chemical methods generally use what material?Answer: chemical method of producing chlorine dioxide usually uses hydrochloric acid and sodium chlorate heating reaction.28. What is the water hammer phenomenon? What harm does it have?Answer: the phenomenon of water hammer is caus
30、ed by the sudden change of liquid velocity in the pressure pipe. Such as the sudden closure or opening of the gate on the pipe; the sudden stop of the pump will cause a sharp rise or decrease in the pressure inside the liquid; this phenomenon is called water hammer.Because of the occurrence of water
31、 hammer, the pressure in the pipeline increases rapidly to several times or even ten times more than the normal pressure. It can cause the rupture of pipes and affect the production and life. Therefore, safety devices must be installed at the sudden switch of the gate.29. The winter cold pipeline eq
32、uipment should do the work?Answer: cold winter preparatory work should be the pipeline pipeline soil, its thickness should be more than the freezing line depth of 0.2 meters, its deficiencies must be carried out a thorough examination of hilling; pipeline, to eliminate the pipeline Water Leakage pre
33、mises and plug removal, pipeline outdoor overhead or dew on the ground should be equipped with good cold proof thermal insulation device, spare parts.30. On the new valve to check the quality of the disintegration, which should be consistent with the requirements?Answer: (1) the valve seat and valve
34、 firmly; (2) the spool and the valve seat, the valve cover and the valve body with good, no defects; (3) the valve rod and the valve core is connected, flexible and reliable; (4) without bending, stem rust, stem and packing gland with the appropriate; (5) gasket and filler bolt and complete, no defe
35、cts.The plumber operation skills1. how to perform water meter installation?Answer: (1) before installing water meter, should remove the dirt in conduit first. (2) the specifications of the water meter shall be adapted to the flow of the pipeline. (3) the water meter shall be installed in a place whe
36、re the inspection is convenient and free from exposure and damage. (4) pay attention to the direction of the water meter. (5) the case table horizontal or vertical installation, should be carried out according to the product specification. (6) in order to make the measurement accurate, there should
37、be more than 10 times the diameter of the straight pipe before the table.2. How to eliminate water hammer?Answer: (1) add soft start or frequency conversion device, can eliminate open pump water hammer. (2) the installation of water hammer eliminator, commonly used under the open pump stop, water ha
38、mmer eliminator, automatic reset, open type stop pump, water hammer eliminator, micro closed check valve. (3) the safety valve is installed to eliminate the water hammer of the valve.3. procedures for the installation of cast iron pipesUnder the pipe, pipe socket, clear dig pits will pipe flat chamb
39、er, pipe (rubber ring), socket socket into alignment opening, check gap - find pipe line, elevation - mouth back claquesous identify the annular gap with twine plug nozzle - Yan - to dig ear (PIT). Pull rope, cleaning and filling nozzle, test and filling hit hit Ma asbestos cement (or expansion ceme
40、nt), curing and filling, inspection, pleural pressure test and acceptance.4. rigid polyvinyl chloride (UPVC) pipe installation procedureGroove and pipe inspection qualified: lower pipe to mouth connection part of backfill water pressure test qualified to fill all backfill.5. water supply steel pipe
41、installation points and matters needing attention1) the pipe should be firmly laid in place to avoid deformation during welding or preheating.2) when the pipeline is connected, it must not be strong enough to match or use heating pipes, plus flat pad, multilayer pad and other methods to eliminate th
42、e defects such as large gap, wrong mouth and different concentricity of the interface.3) the distance from the bend point to the interface shall not be less than lOOmm, and not less than the outer diameter of the pipe.4) the longitudinal welding seam of the coil welded steel pipe shall be placed in
43、an easy to repair position and shall not be at the bottom. The butt welded longitudinal seam of the reinforcing ring and the reinforcing ring shall be staggered with the longitudinal weld of the pipe, and the spacing shall be no less than lOOmm. The reinforcing ring edge shall be less than 50mm from
44、 the circumferential weld of the pipe.5) shall not in the longitudinal tube, ring to the weld line, branch pipe or opening, if the hole must be opened, there should be reliable reinforcement measures. Any position of the pipeline shall be square hole and short tube; for the straight line, the length
45、 is larger than 1000mm, no hole in the nipple or pipe.6) closed welding in the summer or when the temperature is greater, should be applied when the temperature is low, winter should be higher temperature when welding; if necessary, can be provided with expansion joint instead of closed welding.7) p
46、ipeline installation work such as intermittent, open mouth should be closed in time; after welding at the interface by the pressure test, fill again as anticorrosive insulating layer; when the working environment of the wind is greater than 5, rain and snow, the relative humidity is greater than 90%
47、, did not take protective measures or welding.6. piping pressure test procedureFirst, check whether all the control valves in the whole pipe are opened, whether they are separated from the other pipe network and the equipment which can not be involved in the pressure test.Test the pressure pump, val
48、ve, pressure gauge, inlet pipe and so on, and fill in the water. After the water is filled, the air in the pipe system is discharged (the discharge valve flows out of water), and the bleeder valve is closed. Close the inlet valve after filling.Stop pressure when the pressure reaches the test pressure. The pipe is kept under test pressure for 20 minutes, such as no leakage found in the pipe, and the indicator of the pressure gauge drops by no more than 0.02MPa. The strength test is qualified.Put pressure down to work pressure for