CN108799084B - Pump installation inspection method - Google Patents
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- CN108799084B CN108799084B CN201710295369.3A CN201710295369A CN108799084B CN 108799084 B CN108799084 B CN 108799084B CN 201710295369 A CN201710295369 A CN 201710295369A CN 108799084 B CN108799084 B CN 108799084B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
A pump installation inspection method characterized by comprising the steps of: a. the first calibration of the pump, b, the second calibration of the pump, c, the third calibration of the pump comprising the steps of: 1) in the pipeline installation process, install a plurality of guide bracket (9) and adjustable support, 2) set up checkpoint (21) at two corresponding pump mouth pipeline flange (11) and pump mouth flange (12) surface circumferential edge, 3) pipeline pressure testing sweeps, 4) if two flanges are not conform to the standard requirement under the state of nature, can adjust the pipeline section support, 5) the centering of pump mouth pipeline 1 flange and pump mouth flange is checked and accepted. The method has the advantages of detailed design, rigorous steps and strong operability, and can effectively control the distance between the pump port flange and the pipeline flange, the concentricity between the pipeline flange and the center of the pump flange and the parallelism between the pipeline flange surface and the pump flange surface of the pump inlet and outlet pipeline in a free state, and achieve the stress-free piping of the pump.
Description
Technical Field
The invention relates to a method for inspecting a pumping pipeline, in particular to a method for inspecting the installation of a pump.
Background
The national standard fan, compressor, pump installation engineering construction and acceptance regulations (GB50275-2010) point out in the first section of pump general regulations in chapter IV: the suction pipeline and the output pipeline are provided with respective brackets, and the pump cannot directly bear the weight of the pipeline; after the pipeline is connected with the pump, the original alignment precision of the pump should be rechecked, and when the pipeline connection deviation is found, the pipeline should be adjusted.
At present, the difficulty in pump installation is that the concentricity of a pipeline flange and the center of a pump flange and the parallelism of a pipeline flange surface and a pump flange surface of a pump inlet and outlet pipeline in a free state and the like hardly meet the standard requirements.
In the domestic specification, the pipeline installation acceptance and the pump installation acceptance are separately carried out, and are not fully combined, so that the separate acceptance often appears, and the importance of the final calibration of the pump is ignored. In foreign countries, the requirements of the American standard on the flange pipe orifices of the inlet and the outlet of the pump are extremely strict, and the condition that the distance of the flange of the pump opening is too far or the coaxiality does not meet the requirements and the like occurs in the final calibration of the pump, so that the acceptance is very difficult to pass. In the construction and inspection process of foreign pumps and pipeline projects, the success rate of one-time correction is extremely low, a large amount of reworking is often caused, and manpower and material resources are wasted.
Therefore, the known foreign pumps and pipelines have various inconveniences and problems, and the serious pump installation inspection technical measures are urgently required to be proposed in China to change the unsatisfactory current situation so as to adapt to the increasingly severe economic global competition situation.
Disclosure of Invention
The invention aims to provide a pump installation inspection method of a stress-free pipe.
In order to achieve the purpose, the technical solution of the invention is as follows:
a pump installation inspection method characterized by comprising the steps of:
a. first calibration of a pump
After the basic acceptance of the pump is finished, performing primary grouting after the pump equipment is in place, and performing primary calibration on the pump;
b. second calibration of the pump
The pump equipment is in place, after the pump equipment foundation is fully settled, the second calibration of the pump is carried out, then the second grouting is carried out, and the piping installation of the first section of pipe at the inlet and the outlet of the pump and the first section of pipe at the outlet of the pump is carried out;
c. the third calibration of the pump comprises the following steps:
1) in the process of pipeline installation, a plurality of guide supports and adjustable supports are installed on a first section pipeline of a pump inlet, a first section pipeline of a pump outlet, a second section pipeline of the pump inlet and a second section pipeline of the pump outlet, the guide supports limit the transverse deviation of a flange of the pipeline at the pump port, and the adjustable supports limit the displacement of the pipeline in the vertical direction; sufficiently loosening the inlet first-section pipeline and the outlet first-section pipeline to enable the pump to be hoisted in place; the temporary gasket with the same thickness as the gasket is arranged between the pump port and the pipeline flange piece, and the pump port pipeline flange and the pump port flange are screwed up step by step according to the staggered sequence to meet the specified requirement;
2) checking points are arranged on the circumferential edges of the surfaces of two corresponding pump port pipeline flanges and pump port flanges, wherein the checking points are arranged in such a way that eight points which equally divide the circumference are arranged on the circumferences of the two flanges respectively; when a 1 st flange of a pump port pipeline is welded, a clearance between the pump port pipeline and the flange needs to be checked by using a feeler gauge so as to enable the clearance to reach a design value;
3) in the process of pressure test purging of the pipeline, the connection between the 1 st flange of the pump port pipeline and the flange of the pump port needs to be dismantled, the filter and the check valve are removed, and the recalibration of the 1 st flange of the pump port pipeline and the flange of the pump port needs to be carried out in the process of resetting the pipeline after the pressure test purging of the pipeline is finished; when the pipeline is reset, the No. 2 flange of the pump port pipeline is ensured to meet the standard requirement under the natural state of the two flanges;
4) if the two flanges do not meet the standard requirements in a natural state, the pipe section support can be adjusted; if the requirements for the concentricity of the pipeline flange and the center of the pump flange and the parallelism of the pipeline flange surface and the pump flange surface of the pipeline in a free state in the specification can not be met, cutting the welded junction to form a pipeline gold port, and protecting the pump port in the process of forming the pipeline gold port to prevent any impurities from entering the interior of the pump;
5) after the 1 st flange and the pump port flange of the pump port pipeline are centered and accepted, a permanent gasket and a bolt need to be installed, a torque wrench is adopted to carry out tightening in three times according to requirements, and meanwhile, a dial indicator needs to be erected to check the displacement of pump equipment and make a record; if the reading of the dial indicator exceeds the allowable deviation, the pump needs to be finally and precisely calibrated, and the dial indicator is installed to adjust the motor to meet the design requirement.
The pump installation inspection method of the present invention can be further implemented by the following technical measures.
In the method, when the check point is checked, the parallelism of the two flange surfaces needs to be achieved: the deviation required by pipelines below DN250 is within 0.25mm, and the deviation required by pipelines above DN250 is within 0.75 mm; the tolerance for the spacing between the two flanges is +/-1.5mm for the gasket, requiring that the bolt hole centers between the two flanges do not deviate more than 1.5 mm.
In the method, when the first inlet pipeline and the first outlet pipeline are loosened, the connecting bolt of the 1 st flange of the pump port pipeline and the connecting bolt of the pump port flange are loosened, the bolts and the temporary gaskets are taken out, the concentricity between the two flanges is checked for the pipeline with the diameter below DN150 in the free state of the flanges, and then the clearance in four directions is checked on the circumferences of the 1 st flange of the pump port pipeline and the pump port flange by using the feelers to ensure the parallelism.
In the method, when the first inlet pipeline and the first outlet pipeline are loosened, the connecting bolt of the 1 st flange of the pump port pipeline and the connecting bolt of the pump port flange are loosened, the bolts and the temporary gaskets are taken out, the concentricity between the two flanges is checked for the pipeline with the diameter being more than DN150 in the free state of the flanges, and then the clearance in eight directions is checked on the circumferences of the 1 st flange of the pump port pipeline and the pump port flange by using the feeler gauge to ensure the parallelism.
In the method, when the pipeline is reset, the bolt (16) and the permanent gasket are arranged between the pump port pipeline flange and the pump port flange, the 2 nd flange of the pump port pipeline and the filter are respectively screwed down by adopting a torque wrench qualified by verification according to a bolt torque meter, the 2 nd flange of the pump port pipeline and the check valve bolt are screwed down, and half force is firstly screwed down and then the pump port pipeline and the check valve are fully screwed down by adopting a cross staggered sequence during screwing.
The method described above, wherein the final fine calibration of the pump 1 must satisfy the following requirements:
the 1 st requirement: all pump foundation bolts and sizing blocks meet the standard requirements;
the 2 nd requirement: tightening and loosening the bolts of the motor (2), and respectively reading the change values of the dial indicators, wherein the change values are qualified when the change values are less than 0.05 mm;
the 3 rd requirement is as follows: in the case of unconnected inlet first stage conduits) and pump outlet first stage conduits, the allowable range of parallelism deviation between the pump and the motor shaft is +/-0.05 mm; the radial deviation of the coupler is less than 0.05 mm; the allowable range of the distance deviation between the two parts of the coupler is +/-0.25 mm;
the 4 th requirement is that: and covering a coupler shield.
After the technical scheme is adopted, the pump installation inspection method has the following advantages:
1. the inspection method is carefully designed, strict in steps and strong in operability;
2. the distance between a pump port flange and a pipeline flange, the concentricity between the pipeline flange and the center of the pump flange and the parallelism between the surface of the pipeline flange and the surface of the pump flange in a free state of a pump inlet pipeline and a pump outlet pipeline can be effectively controlled, and the stress-free piping of the pump is achieved;
3. the pump calibration success rate is improved, the standard requirement is met, the pump can not be subjected to additional external force caused by a pipeline after calibration, the mature pump port pipeline centering and pump calibration technology is promoted to be formed, manpower is saved, unnecessary reworking is reduced, and the engineering cost is reduced.
Drawings
FIG. 1 is a schematic view of a connection structure of a pipe and a pump according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the arrangement of a pump port pipe flange and a pump port flange according to an embodiment of the present invention;
FIG. 3 is a schematic view of a flange checkpointing in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of the calibration between the pump and the motor according to the embodiment of the present invention.
In the figure, 1 pump, 2 motors, 3 pump inlet first section pipelines, 4 filters, 5 pump inlet second section pipelines, 6 pump outlet first section pipelines, 7 check valves, 8 pump outlet second section pipelines, 9 guide supports, 10 adjustable supports, 11 pump port pipeline 1 st flanges, 12 pump port flanges, 13 pump port pipeline 2 nd flanges, 14 pump and motor coupling shafts, 15 gaskets, 16 bolts, 17 plug gauges, 18 coupling protective covers, 19 dial indicators, 20 pump bases and 21 flange check points.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
The technical solution of the invention is as follows:
the invention relates to a pump installation inspection method, which comprises the following steps:
a. first calibration of a pump
Referring to fig. 1, fig. 1 is a schematic view illustrating a connection structure of a pipe and a pump according to an embodiment of the present invention. And after the basic acceptance of the pump is finished, performing primary grouting after the pump equipment is in place, and performing primary calibration on the pump.
b. Second calibration of the pump
The pump equipment is in place, the pump equipment foundation 20 is fully settled, the second calibration of the pump is carried out, then the second grouting is carried out, and the piping installation of the first section pipe 3 at the inlet and the outlet of the pump and the first section pipeline 6 at the outlet of the pump is carried out.
c. The third calibration of the pump comprises the following steps:
after the pump equipment foundation 20 is fully settled, the piping installation of the first section pipes 3 and 6 at the inlet and the outlet of the pump can be carried out after the secondary calibration of the conventional pump is finished and the secondary grouting is finished.
In the process of installing the pipeline, the first section pipes 3 and 6 and the second section pipes 5 and 8 of the inlet and the outlet of the pump are provided with the sufficient supports 9 and 10, the guide support 9 can limit the transverse deviation of the flange 11 of the pipeline at the pump port, and the adjustable support 10 can limit the displacement of the pipeline in the vertical direction.
Fig. 2 is a schematic view of an arrangement structure of a pump port pipeline flange and a pump port flange according to an embodiment of the present invention. When welding the pump port pipe flange 11, the clearance between the pump port pipe flange and the pump port flange 12 needs to be checked by using the feeler gauge 17.
Fig. 3 is a schematic view of flange checkpointing according to an embodiment of the present invention. Checking the parallelism of two flange surfaces according to a check point 21, wherein the deviation required by the pipeline below DN250 is within 0.25mm, and the deviation required by the pipeline above DN250 is within 0.75 mm; furthermore, the allowable range of flange spacing is +/-1.5mm for a gasket, requiring that the bolt hole centers between the two flanges 11 and 12 do not deviate more than 1.5 mm.
During the pressure test and purging process of the pipeline, the connection of the pump port flanges 11 and 12 needs to be dismantled, the filter 4 and the check valve 7 need to be removed, and the recalibration of the pipeline needs to be completed during the resetting process of the pipeline as shown in fig. 1. The final calibration content is as follows:
1) and fully loosening the first sections of pipelines 3 and 6 at the inlet and the outlet of the pump, and hoisting the pipelines in place.
2) A temporary gasket 15 of the same thickness as the permanent gasket 15 is used to be placed between the pump port and the pipe flange. The flanges 11 and 12 are sufficiently tightened to the specified requirements in steps in a staggered sequence.
3) The adjustable support 10 is adjusted to fully support the first sections of pipes 3 and 6 at the inlet and outlet of the pump. And the 2 nd flange of the pump port pipeline is reset, so that the two pipe flanges meet the standard requirement in a natural state.
4) And installing bolts 16 and permanent gaskets 15, screwing the pipeline flange 13, the filter 4 and the check valve 7 by bolts 16 respectively by adopting a torque wrench qualified in verification according to a bolt torque meter, and screwing half of the force firstly by adopting a cross staggered sequence and then fully screwing.
5) The coupling bolts 16 of the pump port flanges 11 and 12 are loosened, and the bolts 16 and the temporary spacers 15 are removed. In the free state, the concentricity between the flanges is checked, and then the clearance in 4 directions (8 pipes above DN 150) of the flanges 11 and 12 is checked by a feeler gauge 17 to ensure the parallelism.
6) If not, the segment support 10 can be adjusted; if the requirements of the concentricity of the pipeline flange and the center of the pump flange and the parallelism of the pipeline flange surface and the pump flange surface of the pipeline in a free state in the specification can not be met, the cutting welded junction is needed to be used as a gold port. The pump port must be protected during the gold port making process to prevent any impurities from entering the interior of the pump 1.
7) After the pump port pipeline flange centering flanges 11 and 12 are qualified, a permanent gasket 15 and a bolt 16 are required to be installed, and a torque wrench is adopted to screw up the flanges three times according to requirements. Meanwhile, a dial indicator 19 needs to be erected, the displacement of the pump device 1 is checked, and the record is made.
Fig. 4 is a schematic diagram of the calibration between the pump and the motor according to the embodiment of the present invention. If the dial indicator reading exceeds the allowable deviation, a final fine calibration of the pump 1 is required. The dial indicator 19 is installed, and the motor 2 can be slightly adjusted to meet the requirements. But must satisfy the following requirements:
a) all the foundation bolts and the sizing blocks meet the standard requirements
b) Bolts at 4 soft feet of the elastic motor 2 read the change values of the dial indicator respectively, and the bolts are qualified when the change values are less than 0.05 mm.
c) The permissible range of parallelism deviation of the pump 1 from the shaft 14 of the motor 2 without connecting the pipes 3 and 6 is +/-0.05 mm. The coupling radial deviation should be less than 0.05 mm. The tolerance for the distance between the two parts of the coupling is +/-0.25 mm.
d) And adding the coupler protective cover 18 after the completion of the verification, and finishing the verification.
The pump installation inspection method can effectively control the distance between the pump port flange and the pipeline flange, the concentricity of the pipeline flange and the center of the pump flange and the parallelism of the pipeline flange surface and the pump flange surface of the pump inlet and outlet pipeline in a free state, improve the success rate of pump calibration, meet the standard requirement, realize that the pump is not subjected to additional external force brought by the pipeline after calibration, promote the formation of a mature pump port pipeline centering and pump calibration technology, save manpower and reduce unnecessary rework.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (6)
1. A pump installation inspection method characterized by comprising the steps of:
a. first calibration of a pump
After the basic acceptance of the pump is finished, performing primary grouting after the pump is in place, and performing primary calibration on the pump;
b. second calibration of the pump
The pump is in place, after the pump equipment foundation (20) is fully settled, the pump is calibrated for the second time, then secondary grouting is carried out, and the piping installation of the first section of pipe (3) at the inlet of the pump and the first section of pipeline (6) at the outlet of the pump is carried out;
c. the third calibration of the pump comprises the following steps:
1) in the process of pipeline installation, a plurality of guide supports (9) and adjustable supports (10) are installed on the pump inlet first-section pipeline (3), the pump outlet first-section pipeline (6), the pump inlet second-section pipeline (5) and the pump outlet second-section pipeline (8), the guide supports (9) limit the transverse deviation of a pump outlet pipeline 1 st flange (11), and the adjustable supports (10) limit the displacement of the pipelines in the vertical direction; sufficiently loosening the pump inlet first-section pipeline (3) and the pump outlet first-section pipeline (6) to enable the pump to be hoisted in place; temporary gaskets with the same thickness as the gaskets (15) are arranged between the pump port and the pipeline flange plate, and the pump port pipeline 1 st flange (11) and the pump port flange (12) are screwed up step by step according to the staggered sequence to meet the specified requirements;
2) the circumferential edges of the surfaces of a No. 1 flange (11) and a pump port flange (12) of two corresponding pump port pipelines are provided with check points (21), and the check points are set as eight points which equally divide the circumference on the circumferences of the two flanges; when a 1 st flange (11) of a pump port pipeline is welded, a clearance between the pump port pipeline and a pump port flange (12) needs to be checked by using a feeler gauge (17) to enable the clearance to reach a design value;
3) in the process of pressure test purging of the pipeline, the connection between a pump port pipeline 1 st flange (11) and a pump port flange (12) needs to be dismantled, a filter (4) and a check valve (7) are removed, and the recalibration of the pump port pipeline 1 st flange (11) and the pump port flange (12) needs to be carried out in the process of pipeline resetting after the pressure test purging of the pipeline is finished; when the pipeline is reset, the 2 nd flange (13) of the pump port pipeline ensures that the two flanges meet the standard requirement in a natural state;
4) if the two flanges do not meet the standard requirements in a natural state, the pipe section bracket (10) can be adjusted; if the requirements of the concentricity of the 1 st flange of the pump port pipeline and the center of the flange of the pump port and the parallelism of the 1 st flange surface of the pipeline and the flange surface of the pump port on the specification in a free state can not be met, cutting a welded port to be a pipeline gold port, and protecting the pump port in the process of manufacturing the pipeline gold port to prevent any impurities from entering the pump (1);
5) after the 1 st flange and the pump port flange of the pump port pipeline are centered and accepted, a permanent gasket (15) and a bolt (16) need to be installed, a torque wrench is adopted to carry out tightening in three times according to requirements, and meanwhile, a dial indicator (19) needs to be erected to check the displacement of the pump equipment (10) and make a record; if the reading of the dial indicator exceeds the allowable deviation, the pump (1) needs to be finally and accurately calibrated, and the dial indicator (19) is installed to adjust the motor (2) to meet the design requirement.
2. The pump installation inspection method according to claim 1, characterized in that, when the inspection point (21) is inspected, the parallelism of the two flange faces is required to be achieved: the deviation required by pipelines below DN250 is within 0.25mm, and the deviation required by pipelines above DN250 is within 0.75 mm; the tolerance for the spacing between the two flanges is +/-1.5mm for the gasket, requiring that the bolt hole centers between the two flanges do not deviate more than 1.5 mm.
3. The pump installation inspection method according to claim 1, wherein when the first pipe section (3) at the inlet of the pump and the first pipe section (6) at the outlet of the pump are loosened, the connecting bolts (16) of the first flange (11) at the inlet of the pump and the first flange (12) at the outlet of the pump are loosened, the bolts and the temporary gaskets are taken out, the concentricity between the two flanges is inspected firstly for the pipe below the diameter DN150 in the free state of the flanges, and then the clearance in four directions is inspected on the circumferences of the first flange (11) at the inlet of the pump and the first flange (12) at the outlet of the pump by using a feeler (17) to ensure the parallelism.
4. The pump installation inspection method according to claim 1, wherein when the first pipe section (3) at the inlet of the pump and the first pipe section (6) at the outlet of the pump are loosened, the connecting bolts (16) of the first flange (11) at the inlet of the pump and the first flange (12) at the outlet of the pump are loosened, the bolts and the temporary gaskets are taken out, the concentricity between the two flanges is inspected firstly for the pipe with the diameter of over DN150 in the free state of the flanges, and then the clearance in eight directions is inspected on the circumferences of the first flange (11) at the inlet of the pump and the first flange (12) at the outlet of the pump by using a feeler (17) to ensure the parallelism.
5. The pump installation inspection method according to claim 1, wherein bolts (16) and permanent gaskets (15) are installed between the pump port pipeline flange (11) and the pump port flange (12) when the pipeline is reset, the pump port pipeline No. 2 flange (13) and the filter (4) and the pump port pipeline No. 2 flange (13) and the check valve (7) are respectively bolted by using a torque wrench which is qualified through verification according to a bolt torque table, and the pump port pipeline No. 2 flange and the check valve (7) are bolted in a crisscross sequence when the pipeline is tightened, half of the force is firstly tightened, and then the pipeline is fully tightened.
6. Pump installation inspection method according to claim 1, characterized in that the final fine calibration of the pump (1) comprises the following requirements that must be satisfied:
the 1 st requirement: all pump foundation bolts and sizing blocks meet the standard requirements;
the 2 nd requirement: tightening and loosening the bolts of the motor (2), and respectively reading the change values of the dial indicators, wherein the change values are qualified when the change values are less than 0.05 mm;
the 3 rd requirement is as follows: under the condition that the inlet first-section pipeline (3) and the pump outlet first-section pipeline (6) are not connected, the deviation allowable range of the parallelism of the pump (1) and the shaft (14) of the motor (2) is +/-0.05 mm; the radial deviation of the coupler is less than 0.05 mm; the allowable range of the distance deviation between the two parts of the coupler is +/-0.25 mm;
the 4 th requirement is that: covering the coupling shield (18).
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| CN201710295369.3A CN108799084B (en) | 2017-04-28 | 2017-04-28 | Pump installation inspection method |
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| CN201710295369.3A CN108799084B (en) | 2017-04-28 | 2017-04-28 | Pump installation inspection method |
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| CN108799084A CN108799084A (en) | 2018-11-13 |
| CN108799084B true CN108799084B (en) | 2020-03-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08296783A (en) * | 1995-04-24 | 1996-11-12 | Iseki & Co Ltd | Suction pipe mounting device |
| CN202972193U (en) * | 2012-12-20 | 2013-06-05 | 中国机械工业建设集团有限公司 | Stress-free flexible pipe installing structure |
| CN104344073A (en) * | 2013-07-23 | 2015-02-11 | 李孝虎 | Chemical pipe installation method |
| CN106286200B (en) * | 2015-06-27 | 2018-07-27 | 上海梅山钢铁股份有限公司 | Split type vacuum pump and its installation method |
| CN205173070U (en) * | 2015-11-24 | 2016-04-20 | 安德里茨（中国）有限公司 | Pump mounting structure |
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