CN104897860A - Novel expanding connection technology and assessment method - Google Patents
Novel expanding connection technology and assessment method Download PDFInfo
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- CN104897860A CN104897860A CN201510353078.6A CN201510353078A CN104897860A CN 104897860 A CN104897860 A CN 104897860A CN 201510353078 A CN201510353078 A CN 201510353078A CN 104897860 A CN104897860 A CN 104897860A
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Abstract
The invention discloses a novel expanding connection technology and assessment method. The novel expanding connection technology and assessment method includes steps of (1), selecting expanding connection sizes; (2), manufacturing simulation tube plates; (3), selecting hydraulic tube expanders; (4), carrying out expanding connection tests; (5), carrying out water pressure tests on the simulation tube plates according to water pressure experimental values of products after the expanding connection tests are completely carried out; (6), carrying out ammonia leak tests on the simulation tube plates after the simulation tube plates pass the water pressure tests, appropriately increasing expanding connection pressures for leaking tube heads and carrying out expanding connection on the leaking tube heads; (7), machining strength expanding connection test samples again, carrying out strength expanding connection according to determined expanding connection parameters, carrying out pulling-out force and dissection tests on heat exchange tubes after the heat exchange tubes are subjected to expanding connection and determining that the heat exchange tubes are qualified if pulling-out force results are higher than 4MPa and internal full degrees of tanks reach 80% at least. Materials, the thicknesses and the borehole diameters of the tube plates are consistent with materials, the thicknesses and the borehole diameters of the actual products. The novel expanding connection technology and assessment method has the advantages that 100% qualification of tube plates and the heat exchange tubes of heat exchangers can be guaranteed after the tube plates and the heat exchange tubes of the heat exchangers are subjected to expanding connection, and accordingly the safety of the heat exchangers can be improved.
Description
Technical field
The invention belongs to technical field of heat exchangers, particularly a kind of novel expanding joint process and assessment method.
Background technology
Along with the continuous progress of science and technology, the industries such as new forms of energy, energy-conserving and environment-protective, oil, chemical industry, pharmacy and electric power require more and more higher to the tube-sheet heat exchanger carrying out exchange heat.Spiral tube exchanger is also known as threaded line pipe coiled heat exchanger, screw heat exchange of heat pipe, obtain representative works in heat exchange product of new generation, mainly being applicable to vapour-liquid heat-exchanging state, is according to technical design such as CFD Fluid Mechanics Computation technology, FEM differential finite element technique, OWEN turbulent buffeting Nyquist criterion, Eisinger criterion, Bevinsbbb criterion, asymmetric drift designs.14000w/ ㎡ is reached as high as at present at the steam-water heat exchanging operating mode coefficient of heat transfer. DEG C.
Expanded joint is again one of important procedure in heat exchanger, and the hardness number that GB151 proposes heat exchange tube material is generally not less than the hardness number of tube sheet material; The hardness number of external many standard all regulation tube sheet should be greater than the hardness of heat exchanger tube, and general control is in HB20 ~ 30.Weld again after first adopting expanded joint between the tube sheet of general plate type heat exchanger and heat exchanger tube, but owing to being determine expanded joint tightness according to operator's experience, expanded joint quality is affected by human factors larger, owe swollen sealing and the physical strength that can not ensure swollen mouth, cross and swollenly make tube wall too thinning and cause heating tube to break or tube plate deformation, in use often there is pad, bolted flange joints seal leakage, the heat exchanger tube mouth of pipe on tube sheet leaks, the defects such as welding crack, the use of heat exchanger brings potential safety hazard.
Summary of the invention
Object of the present invention will solve the problems of the technologies described above.
The object of the present invention is achieved like this: novel expanding joint process and assessment method, is characterized in that: comprise the following steps:
(1), the selection of expanded joint size, the groove width 8mm of swollen groove, groove depth 0.6mm;
(2), make simulation tube sheet, tube sheet material, thickness, bore diameter are all consistent with actual product;
(3), hydraulic casing roller is selected according to simulating tube sheet and heat exchanger tube size and expanded joint area size;
(4), strength and buckling parameter carries out expanded joint test to be one grade every 5 ~ 10MPa;
(5), expanded joint test complete, to simulation tube sheet carry out the hydraulic testing by product hydrostatic test value;
(6), confined space is connected between simulation tube sheet with plate, water inlet and pressure gauge connection is provided with above plate, water is injected hydraulic testing chamber, tube head end spray infiltration developer, be convenient to observe and whether seep water, carry out ammonia leak test after the hydraulic testing is qualified, to the tube head leaked, suitably tune up expanding pressure expanded joint again;
(7), again process strength and buckling sample, carry out strength and buckling by the expanded joint parameter determined, carry out pulling-out force and Dissection test to the heat exchanger tube after expanded joint, pulling-out force result is greater than 4MPa, and in groove, full level reaches more than 80% for qualified.
Described simulation tube sheet and the material of heat exchanger tube all adopt S31608.
To this invention ensures that after the tube sheet of heat interchanger and heat exchanger tube expanded joint that 100% is qualified, improve the security of heat interchanger.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of test structure of the present invention.
In figure: 1, simulate tube sheet; 2, hydraulic testing chamber; 3, water inlet and pressure gauge connection; 4, heat exchanger tube.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described, but not as limitation of the present invention:
Novel expanding joint process and assessment method, is characterized in that: comprise the following steps:
(1), the selection of expanded joint size, the groove width 8mm of swollen groove, groove depth 0.6mm;
(2), make simulation tube sheet 1, tube sheet material, thickness, bore diameter are all consistent with actual product;
(3), hydraulic casing roller is selected according to simulating tube sheet 1 and heat exchanger tube 4 size and expanded joint area size;
(4), strength and buckling parameter carries out expanded joint test to be one grade every 5 ~ 10MPa;
(5), expanded joint test complete, to simulation tube sheet carry out the hydraulic testing by product hydrostatic test value;
(6), confined space is connected between simulation tube sheet 1 with plate, water inlet and pressure gauge connection 3 is provided with above plate, water is injected hydraulic testing chamber 2, tube head end spray infiltration developer, be convenient to observe and whether seep water, carry out ammonia leak test after the hydraulic testing is qualified, to the tube head leaked, suitably tune up expanding pressure expanded joint again;
(7), again process strength and buckling sample, carry out strength and buckling by the expanded joint parameter determined, carry out pulling-out force and Dissection test to the heat exchanger tube after expanded joint, pulling-out force result is greater than 4MPa, and in groove, full level reaches more than 80% for qualified.
Described simulation tube sheet 1 and the material of heat exchanger tube 4 all adopt S31608; Hydraulic casing roller selects 500MPa super high pressure hydraulic electric tube expander to carry out flexible expanded joint.
During concrete enforcement, simulation tube sheet 1 of the present invention and heat exchanger tube 4 adopt S31608, and S31608 is austenitic stainless steel, and both do not exist difference of hardness by material, simultaneously owing to having good plasticity, therefore not by the restriction of difference of hardness.
The present invention adopts 500MPa super high pressure hydraulic electric tube expander to carry out flexible expanded joint, and this kind of expanding joint method reliability is high, expanded joint process uniform force, and heat exchanger tube is not easily excessively swollen; After tested, pulling-out force result is all greater than 4MPa.In groove, full level reaches more than 80%, fullys meet tension and takes off and sealing function.
Claims (2)
1. novel expanding joint process and assessment method, is characterized in that: comprise the following steps:
(1), the selection of expanded joint size, the groove width 8mm of swollen groove, groove depth 0.6mm;
(2), make simulation tube sheet (1), tube sheet material, thickness, bore diameter are all consistent with actual product;
(3), hydraulic casing roller is selected according to simulating tube sheet (1) and heat exchanger tube (4) size and expanded joint area size;
(4), strength and buckling parameter carries out expanded joint test to be one grade every 5 ~ 10MPa;
(5), expanded joint test complete, to simulation tube sheet carry out the hydraulic testing by product hydrostatic test value;
(6), will simulate between tube sheet (1) and connect into confined space with plate, water inlet and pressure gauge connection (3) is provided with above plate, water is injected hydraulic testing chamber (2), tube head end spray infiltration developer, be convenient to observe and whether seep water, carry out ammonia leak test after the hydraulic testing is qualified, to the tube head leaked, suitably tune up expanding pressure expanded joint again;
(7), again process strength and buckling sample, carry out strength and buckling by the expanded joint parameter determined, carry out pulling-out force and Dissection test to the heat exchanger tube after expanded joint, pulling-out force result is greater than 4MPa, and in groove, full level reaches more than 80% for qualified.
2. novel expanding joint process according to claim 1 and assessment method, is characterized in that: described simulation tube sheet (1) and the material of heat exchanger tube (4) all adopt S31608.
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| CN201510353078.6A CN104897860A (en) | 2015-06-24 | 2015-06-24 | Novel expanding connection technology and assessment method |
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| CN201510353078.6A CN104897860A (en) | 2015-06-24 | 2015-06-24 | Novel expanding connection technology and assessment method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706298A (en) * | 2017-01-11 | 2017-05-24 | 江苏省特种设备安全监督检验研究院 | Expanding connection process evaluation method for tube-tube plate joint |
| CN107014430A (en) * | 2017-03-31 | 2017-08-04 | 中国特种设备检测研究院 | A kind of sealing property method of testing of Zr/Ti pipes tube sheet joint |
| CN108645290A (en) * | 2018-05-21 | 2018-10-12 | 晋西工业集团有限责任公司 | A kind of cylindrantherae matrix swelling pressure assembly method |
| CN111289369A (en) * | 2018-12-07 | 2020-06-16 | 金国达科技（湖南）有限公司 | Pipe expansion and pressure-resistant sealing detection device of surface cooler |
| CN112683570A (en) * | 2020-12-08 | 2021-04-20 | 苏州热工研究院有限公司 | Sampling method suitable for nuclear power station main pump shaft forge piece manufacturing process evaluation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706298A (en) * | 2017-01-11 | 2017-05-24 | 江苏省特种设备安全监督检验研究院 | Expanding connection process evaluation method for tube-tube plate joint |
| CN107014430A (en) * | 2017-03-31 | 2017-08-04 | 中国特种设备检测研究院 | A kind of sealing property method of testing of Zr/Ti pipes tube sheet joint |
| CN108645290A (en) * | 2018-05-21 | 2018-10-12 | 晋西工业集团有限责任公司 | A kind of cylindrantherae matrix swelling pressure assembly method |
| CN111289369A (en) * | 2018-12-07 | 2020-06-16 | 金国达科技（湖南）有限公司 | Pipe expansion and pressure-resistant sealing detection device of surface cooler |
| CN112683570A (en) * | 2020-12-08 | 2021-04-20 | 苏州热工研究院有限公司 | Sampling method suitable for nuclear power station main pump shaft forge piece manufacturing process evaluation |
| CN112683570B (en) * | 2020-12-08 | 2022-08-30 | 苏州热工研究院有限公司 | Sampling method suitable for nuclear power station main pump shaft forge piece manufacturing process evaluation |
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