CN107782631B - Device for enhancing shell strength in heat exchanger tube head pressure test and pressure test method - Google Patents
Device for enhancing shell strength in heat exchanger tube head pressure test and pressure test method Download PDFInfo
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- CN107782631B CN107782631B CN201711160340.0A CN201711160340A CN107782631B CN 107782631 B CN107782631 B CN 107782631B CN 201711160340 A CN201711160340 A CN 201711160340A CN 107782631 B CN107782631 B CN 107782631B
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- 238000012360 testing method Methods 0.000 title claims abstract description 67
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 16
- 238000010998 test method Methods 0.000 title abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000004804 winding Methods 0.000 claims description 76
- 238000003466 welding Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 7
- 230000001965 increasing effect Effects 0.000 claims description 7
- 239000002356 single layer Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of petrochemical heat exchange devices, and particularly relates to a device for enhancing shell strength in a heat exchanger tube head pressure test and a pressure test method. A device for reinforcing the strength of a heat exchanger shell of a fixed tube plate is used in the pressure test process of the heat exchanger of the fixed tube plate, and is arranged on the heat exchanger shell, a plurality of strength-increasing flexible ropes are wound on the heat exchanger shell, blind area reinforcing rings are wound on the connecting part of the heat exchanger shell and a connecting pipe fitting, and a connecting pipe flange assembly is arranged on a connecting pipe fitting flange. The invention utilizes the characteristics of softness and easy deformation of the flexible cable and capability of bearing tensile stress to effectively increase the strength of the shell, and the equipment has low cost, wide application range and strong practicability.
Description
Technical Field
The invention belongs to the technical field of heat exchange devices, and particularly relates to a device for enhancing shell strength in a heat exchanger tube head pressure test and a pressure test method.
Background
The fixed tube-plate heat exchanger has the characteristics of simple and compact structure, fewer machining parts and low manufacturing cost, and has wide application in petroleum refining and chemical production. Under the working condition that the tube side pressure (Pt) is higher than the shell side pressure (Ps), and the difference value of the tube side pressure (Pt) and the shell side pressure (Ps) is larger, the shell thickness is thinner, so that the pressure test of the tube side pressure test pressure on the tube head cannot be improved. At present, a design and manufacturing unit generally adopts a method of repairing ammonia to detect leakage of the pipe head, but the method has high danger and high cost, and can only detect the compactness of the pipe head, but can not detect whether the compressive strength of the pipe head can meet the use requirement, so that the pipe head has great leakage hidden danger. The fixed tube-plate heat exchanger with Pt > Ps working condition can not bear the test pressure of tube pass because the wall thickness of the shell is relatively thin, so that the pressure-proof test of the tube head can not be carried out by improving the test pressure of the shell pass. The technical problem that has not been solved in the pressure vessel manufacturing industry is how to enhance the shell strength of a heat exchanger when the pressure strength test of the tube head is carried out on a fixed tube-plate heat exchanger with the working condition of Pt > Ps. At present, a method for detecting a pipe head by using ammonia supplementing leakage detection is generally used, and the problems are that: ammonia and air easily form explosion mixture to cause explosion hazard, and ammonia leakage can cause environmental pollution to cause personnel poisoning, in addition, the ammonia leak detection method can only detect the compactness of the pipe head, and can not detect whether the compressive strength of the pipe head can meet the use requirement.
Disclosure of Invention
The invention aims to provide a device and a pressure test method for reinforcing the shell strength of a fixed tube plate heat exchanger when the fixed tube plate heat exchanger with the working condition of Pt > Ps is subjected to tube head compressive strength test.
The technical scheme provided by the invention is as follows:
A device for enhancing the shell strength in the pressure test of heat exchanger tube head is used for fixing the pressure test process of tube head of tube plate heat exchanger, is arranged on the heat exchanger shell,
The side wall of the heat exchanger shell is fixedly connected with a connecting pipe fitting, the circumference of the connecting pipe fitting of the heat exchanger shell and the connecting pipe fitting is provided with a blind area reinforcing ring, the back of the flange on the connecting pipe fitting is fixedly provided with a flange rigidity reinforcing ring, the flange of the connecting pipe fitting is fixedly provided with a blind plate, the blind plate is fixedly provided with a pressure gauge assembly, the heat exchanger shell, the blind area reinforcing ring and the connecting pipe fitting are wound with a plurality of strength-increasing flexible wires, the winding direction is circumferential spiral winding, and the joint of the end parts between the flexible wires is connected by using a cable turnbuckle.
Specifically, the blind area reinforcement ring constitute for the barrel of two semi-cylindrical structures, the connecting portion of two barrels wherein one end is the circular slot setting and this connecting portion cover in the connecting tube root, the internal diameter of blind area reinforcement ring is the same with heat exchanger shell external diameter, the axis of blind area reinforcement ring coincides with heat exchanger shell axis.
Specifically, the flange rigidity enhancing ring is composed of two semi-annular arc plates, and the inner diameter of the flange rigidity enhancing ring is the same as that of the connecting pipe fitting.
Specifically, when the flexible cable is wound in a single layer, the winding starts from the joint of the heat exchanger tube plate at the end part of the heat exchanger shell and the welding seam of the heat exchanger shell as the initial end; when the flexible cable is wound in multiple layers, the connecting weld joints of the tube plates at the two ends and the shell are staggered to serve as winding starting points.
In particular, the wrapping of the connecting tube begins at the weld joint of the connecting tube and the heat exchanger shell.
Specifically, the diameter of the flexible cable is 4-6mm.
A method for performing a pressure test using the device for enhancing the strength of a shell in the pressure test of a heat exchanger tube head as described above, comprising the steps of checking the strength of the heat exchanger shell before the pressure test and preparing a construction tool, wherein the construction tool comprises: the flexible cable winding device, the ratchet tightening device, the fastening wrench and the like, the specification of a wound flexible cable, the winding number of turns and the number of layers of winding and the winding length of a required flexible cable are determined through the strength check of the shell before the pressure test, the width of a winding blind area reinforcing ring and the thickness of a flange rigidity reinforcing ring are determined, and the method further comprises the following steps:
s1, manufacturing a blind area reinforcing ring and a flange rigidity reinforcing ring, manufacturing according to the determined width of the blind area reinforcing ring and the thickness of the flange rigidity reinforcing ring, and tightly fitting the blind area reinforcing ring and a heat exchanger shell after manufacturing;
S2, carrying out flexible cable winding on the heat exchanger shell, wherein a ratchet wheel tightener is used for tightening the flexible cable in the flexible cable winding process, and the joint of the flexible cable is connected by a turnbuckle of the cable; the connecting pipe fitting is used for carrying out flexible rope winding, a ratchet wheel tightener is used for tightening the flexible rope in the winding process, the positions of the joints of the flexible rope are connected by a turnbuckle of the rigging, certain pre-tensioning force is used for winding during winding, and when the flexible rope is in single-layer winding, the winding is started from the joint of the heat exchanger tube plate at the end part of the heat exchanger shell and the welding seam of the heat exchanger shell as the starting end; when the flexible cable is wound in multiple layers, connecting welding seams of the heat exchanger tube plates at two ends and the heat exchanger shell are staggered to serve as winding starting points, and winding of the connecting pipe fitting is started from the connecting position of the connecting pipe fitting and the welding seam of the heat exchanger shell;
s3, after all the flexible wires are wound, assembling a flange rigidity enhancement ring on the connecting pipe fitting, wherein the flange rigidity enhancement ring is arranged on the back surface of the flange on the connecting pipe fitting, a blind plate is fixed on the flange of the connecting pipe fitting, a pressure gauge assembly is fixedly arranged on the blind plate, a sealing gasket is arranged between the flange of the connecting pipe fitting and the blind plate, the flange of the connecting pipe fitting is connected with the blind plate through a bolt fastener, and the bolt fastener is screwed by using a fastening spanner;
S4, injecting water into the shell side, and after the device for increasing the strength outside the heat exchanger shell is completely installed, injecting water, wherein the temperature of the water is not lower than 5 ℃;
s5, boosting and stabilizing pressure of the equipment, slowly raising the test pressure, maintaining the pressure for 30 minutes after the test pressure reaches the specified test pressure, and carrying out leakage inspection on all welding seams and connecting parts, if leakage exists, carrying out a test again after repairing;
s6, releasing pressure, wherein the pressure is released under the conditions that no liquid leaks, no abnormal sound exists in the heat exchanger shell and no visible deformation exists in the fifth checking process;
s7, repeatedly pressing, and repeating the operation of the fifth step;
S8, completely releasing the pressure, performing the checking work in the step six, and completely releasing the pressure under the normal condition;
S9, removing the flexible cable.
Specifically, after winding of each layer of flexible cable is completed, checking the loosening area, wherein the loosening area of each flexible cable is not more than 5% of the winding area of the flexible cable.
Specifically, the method further comprises the following steps of cleaning sundries affecting the winding and attaching effects on the surface of the heat exchanger shell before winding.
Specifically, the method further comprises the following steps of purging the interior of the heat exchanger shell after the flexible wires are removed, and sealing and protecting the inlet.
The invention mainly solves the problem that the strength of the shell is increased by winding the flexible cable outside the shell, so that the heat exchanger shell side test pressure can be improved according to the tube side test pressure, and the heat exchanger shell side is pressed, so that the aim of performing a compressive strength test on the welding seam of the head is fulfilled. The flexible cable is flexible and easy to deform, the strength of the shell can be effectively increased by using the characteristics of tensile stress resistance, the equipment is low in cost, wide in application range and strong in practicability, equipment manufacturing materials are greatly saved, the production cost of the equipment is reduced, the development targets of energy conservation and emission reduction advocated by China are met, the technical problem that the fixed tube-plate heat exchanger cannot perform tube head pressure resistance test by improving shell side test pressure under the working condition of Pt & gtPs is solved, the hidden danger of tube head leakage is eliminated, the guarantee is provided for safe and stable operation of petrochemical equipment, and the strength requirement when the tube head is subjected to pressure resistance test under the condition of improving the shell side test pressure is met. According to the invention, water without toxicity is adopted for hydraulic test, so that some dangers are avoided; the pressure-resistant test method provided by the invention eliminates the hidden trouble of leakage of the tube head caused by the fact that the tube head cannot bear tube side pressure, and provides guarantee for safe and stable operation of petrochemical equipment.
The method provided by the invention adopts the detachable flexible cable and the like as temporary compression elements to increase the strength of the shell on the premise of not changing the design thickness of the shell and increasing the material loss, and the flexible cable and the like can be reused after being removed after the pressure test is completed. The method provided by the invention is also suitable for the pressure-proof test of the fixed tube-plate heat exchanger under the working condition that Pt & gtPs containing the medium with extremely high toxicity is extremely harmful, and the pressure-proof test method provided by the invention can be also used for the airtight test of taking the tube head of the heat exchanger as the test pressure according to the tube side design pressure.
Drawings
FIG. 1 is a schematic view of the structure of the device according to the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of a winding pattern for winding a single layer of flexible cord;
FIG. 4 is a schematic view of a winding pattern for winding two layers of flexible cord;
FIG. 5 is a schematic view of a dead zone stiffening ring construction;
FIG. 6 is a schematic structural view of a flange stiffness enhancing ring;
fig. 7 is a schematic structural view of a rigging turnbuckle.
1 Heat exchanger tube plate 2 blind area reinforcing ring 3 heat exchanger shell 4 flexible cable
5 Connecting pipe fitting 6 pressure gauge component 7 flange rigidity enhancement ring 8 rigging turnbuckle
9 Gasket seal 10 bolt fastener.
Detailed Description
As shown in figure 1, a device for enhancing the shell strength in the pressure test of a heat exchanger tube head is used for fixing the pressure test process of the heat exchanger tube head of a tube plate, is arranged on a heat exchanger shell 3,
Fixedly connected with connects pipe fitting 5 on the lateral wall of heat exchanger casing 3, sets up blind area reinforcement ring 2 on the circumference of the takeover portion of heat exchanger casing 3 and connecting pipe fitting 5, the fixed flange rigidity reinforcing ring 7 that is provided with in the back of flange on connecting pipe fitting 5 is fixed with the blind plate on the flange of connecting pipe fitting 5, fixed pressure gauge subassembly 6 that sets up on the blind plate heat exchanger casing 3, blind area reinforcement ring 2, connecting pipe fitting 5 on twine a plurality of increase intensity with flexible cable 4, the direction of twining is circumference spiral winding, the joint department of tip uses the rigging turnbuckle 8 to connect between the flexible cable 4.
The blind area reinforcement ring 2 constitute for the barrel of two semi-cylindrical structures, the connecting portion of two barrel wherein one end is the circular slot setting and this connecting portion cover in connecting pipe fitting 5 root, the internal diameter of blind area reinforcement ring 2 is the same with heat exchanger shell 3 external diameter, the axis of blind area reinforcement ring 2 coincides with heat exchanger shell 3 axis.
The flange rigidity enhancing ring 7 is composed of two semi-annular arc plates, and the inner diameter of the flange rigidity enhancing ring 7 is the same as that of the connecting pipe fitting 5.
When the flexible cable is wound in a single layer, the winding starts from the welding seam connection part of the heat exchanger tube plate 1 at the end part of the heat exchanger shell 3 and the heat exchanger shell 3 as the initial end; when the flexible cable is wound in multiple layers, the connecting weld joints of the tube plates at the two ends and the shell are staggered to serve as winding starting points.
The winding of the connection tube 5 starts from the welded joint of the connection tube 5 and the heat exchanger shell 3.
The diameter of the flexible cable 8 is 4-6mm. In order to increase the bonding area between the flexible cable and the heat exchanger shell and the bonding area between the flexible cable winding layers as much as possible and reduce the winding labor intensity as much as possible, the diameter of the flexible cable is selected to be proper, and the 4-6mm effect is optimal.
A method of performing a pressure test using the apparatus for enhancing the strength of a shell in a heat exchanger tube head pressure test as described above, comprising the steps of verifying the strength of the heat exchanger shell prior to the pressure test and preparing a construction tool, the construction tool comprising: the flexible cable winding device, the ratchet tightening device, the fastening wrench and the like, the specification of the wound flexible cable 4, the winding number of turns and the number of layers of winding and the winding length of the required flexible cable 4 are determined through the strength check of the shell before the pressure test, the width of the winding blind area reinforcing ring 2 and the thickness of the flange rigidity reinforcing ring 7 are determined, and the method further comprises the following steps:
S1, manufacturing a blind area reinforcing ring 2 and a flange rigidity reinforcing ring 7, manufacturing according to the determined width of the blind area reinforcing ring 2 and the thickness of the flange rigidity reinforcing ring 7, and tightly fitting and assembling the blind area reinforcing ring 2 and a heat exchanger shell 3 after manufacturing;
s2, winding a flexible rope 4 on the heat exchanger shell 3, wherein the flexible rope 4 is tightened by using a ratchet tightener in the winding process of the flexible rope 4, and the joint of the flexible rope 4 is connected by a rigging turnbuckle 8; the connecting pipe fitting 5 is used for winding the flexible rope 4, a ratchet wheel tightener is used for tightening the flexible rope 4 in the winding process, the joint of the flexible rope 4 is connected by a turnbuckle 8 of a rigging, certain pre-tensioning force is used for winding during winding, and when the flexible rope is in single-layer winding, the winding is started from the welding seam connecting position of the heat exchanger tube plate 1 at the end part of the heat exchanger shell 3 and the heat exchanger shell 3 as the initial end; when the flexible cable is wound in multiple layers, connecting welding seams of the heat exchanger tube plates 1 and the heat exchanger shell 3 at two ends are staggered to serve as winding starting points, and winding of the connecting pipe fitting 5 is started from the welding seam connecting position of the connecting pipe fitting 5 and the heat exchanger shell 3;
S3, after the flexible wires 4 are completely wound, the connecting pipe fitting 5 is provided with a flange rigidity enhancement ring 7, the flange rigidity enhancement ring 7 is arranged on the back surface of the flange on the connecting pipe fitting 5, a blind plate is fixed on the flange of the connecting pipe fitting 5, a pressure gauge assembly 6 is fixedly arranged on the blind plate, a sealing gasket 9 is arranged between the flange of the connecting pipe fitting 5 and the blind plate, the flange of the connecting pipe fitting 5 is connected with the blind plate through a bolt fastener 10, and the bolt fastener 10 is screwed by using a fastening wrench;
s4, injecting water into the shell side, and after the device for increasing the strength outside the heat exchanger shell 3 is completely installed, injecting water, wherein the temperature of the water is not lower than 5 ℃;
s5, boosting and stabilizing pressure of the equipment, slowly raising the test pressure, maintaining the pressure for 30 minutes after the test pressure reaches the specified test pressure, and carrying out leakage inspection on all welding seams and connecting parts, if leakage exists, carrying out a test again after repairing;
s6, releasing pressure, wherein no liquid leaks, no abnormal sounds exist in the heat exchanger shell 3 and no visible deformation exists in the fifth checking process;
s7, repeatedly pressing, and repeating the operation of the fifth step;
S8, completely releasing the pressure, performing the checking work in the step six, and completely releasing the pressure under the normal condition;
S9, removing the flexible cable 8.
After each layer of flexible wires 4 is wound, the loose area is checked, and the loose area of each flexible wire 4 is not more than 5% of the winding area of the flexible wires 4.
The method further comprises the following steps of cleaning sundries affecting the winding and attaching effects on the surface of the heat exchanger shell 3 before winding.
The method further comprises the following steps of purging the interior of the heat exchanger shell 3 after the flexible wires are removed, and sealing the inlet.
After the flexible cable 4 is removed, the interior of the shell needs to be purged completely, and the inlet is sealed and protected.
When the pressure test method is carried out by adopting the equipment provided by the invention, the equipment support needed by the pressure test method is assembled and welded after the pressure test of the pipe head is finished; for equipment needing heat treatment on the shell, the support backing plate and the heat exchanger shell can be welded before heat treatment, and other support components are assembled and welded after the tube head pressure resistance test is completed. Before the pressure test, the strength of the equipment and the heat exchanger shell 3 is checked by calculating according to the pressure of the heat exchanger tube side pressure test, the specification of the wound flexible cable 4, the number of winding turns and the number of layers are further determined, and the winding length of the required flexible cable 4 is further determined; when the pressure test is carried out, firstly, weld flash, rust slag and other influence attaching impurities on the surface of the heat exchanger shell 3 are cleaned, the blind area reinforcing ring 2 is sleeved on the outer side of the cylinder body at the connecting pipe, the cutting line of the blind area reinforcing ring 2 is parallel to the axis of the heat exchanger shell 3, and the blind area reinforcing ring 2 can be tightly attached to the heat exchanger shell 3; after the pressure test is qualified, temporary pressure-receiving elements such as the flexible cable 4 and the like can be removed after the pressure in the cavity of the heat exchanger shell 3 is completely released. If the leakage phenomenon exists in the connecting pipe fitting 5 in the pressure test process, the pressure test can be continuously carried out after the repair welding of the connecting pipe fitting 5.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (10)
1. The utility model provides a device of casing intensity when reinforcing heat exchanger tube head withstand voltage test, uses and fixes tube sheet heat exchanger tube head withstand voltage test process, sets up on heat exchanger casing (3), and fixedly connected with connects pipe fitting (5) on the lateral wall of heat exchanger casing (3), sets up blind area reinforcement ring (2) on the circumference of the takeover portion of heat exchanger casing (3) and connecting pipe fitting (5), the fixed flange rigidity reinforcing ring (7) that is provided with in the back of flange on connecting pipe fitting (5), is fixed with the blind plate on the flange of connecting pipe fitting (5), fixed pressure gauge subassembly (6) that sets up on the blind plate heat exchanger casing (3), blind area reinforcing ring (2), connecting pipe fitting (5) on twine a plurality of increase intensity with flexible cable (4), the direction of twining is circumference spiral winding, and the joint department of tip uses between flexible cable (4) is connected with rigging spiral-up (8).
2. The device for enhancing the shell strength in the pressure test of the heat exchanger tube head according to claim 1, wherein the blind area reinforcing ring (2) is formed by two semi-cylindrical structural cylinders, the connecting part at one end of the two cylinders is arranged in a circular groove and sleeved at the root of the connecting pipe fitting (5), the inner diameter of the blind area reinforcing ring (2) is the same as the outer diameter of the heat exchanger shell (3), and the axis of the blind area reinforcing ring (2) coincides with the axis of the heat exchanger shell (3).
3. Device for reinforcing the strength of a shell in a pressure test of a heat exchanger tube head according to claim 1, characterized in that the flange rigidity reinforcing ring (7) consists of two semi-annular arc plates, the inner diameter of the flange rigidity reinforcing ring (7) being the same as the connecting tube (5).
4. The device for enhancing the shell strength in the heat exchanger tube head pressure test according to claim 1, wherein when the flexible cable (4) is wound in a single layer, the winding starts from the joint of the heat exchanger tube plate (1) at the end part of the heat exchanger shell (3) and the weld joint of the heat exchanger shell (3) as the starting end; when the flexible cable (4) is wound in multiple layers, the connecting welding seams of the tube plates at the two ends and the shell are staggered to serve as winding starting points.
5. Device for increasing the strength of a shell in a heat exchanger tube head pressure test according to claim 1, characterized in that the wrapping of the connecting tube (5) starts from the weld joint of the connecting tube (5) and the heat exchanger shell (3).
6. Device for reinforcing the strength of a shell in a heat exchanger tube head pressure test according to claim 1, characterized in that the diameter of the flexible wire (4) is 4-6mm.
7. A method of performing a pressure test using the apparatus for enhancing the strength of a heat exchanger tube head pressure test of any preceding claim, comprising the step of preparing a heat exchanger shell strength check and a construction tool prior to the pressure test, the construction tool comprising: the flexible cable winding device, the ratchet tightening device and the fastening wrench are used for determining the specification of a wound flexible cable (4), the winding number of turns and the number of layers of the winding and the winding length of the required flexible cable (4) through the strength check of the shell before the pressure test, and determining the width of a winding blind area reinforcing ring (2) and the thickness of a flange rigidity reinforcing ring (7), and the method is characterized by further comprising the following steps: s1, manufacturing a blind area reinforcing ring (2) and a flange rigidity reinforcing ring (7), manufacturing according to the determined width of the blind area reinforcing ring (2) and the thickness of the flange rigidity reinforcing ring (7), and tightly fitting and assembling the blind area reinforcing ring (2) and a heat exchanger shell (3) after manufacturing;
S2, winding a flexible rope (4) on the heat exchanger shell (3), wherein the flexible rope (4) is tightened by using a ratchet tightening device in the winding process of the flexible rope (4), and the joint of the flexible rope (4) is connected by a turnbuckle (8) of the rigging; the connecting pipe fitting (5) is used for winding the flexible rope (4), a ratchet wheel tightener is used for tightening the flexible rope (4) in the winding process, the joint of the flexible rope (4) is connected by a turnbuckle (8) of the rigging, certain pre-tensioning force is used for winding during winding, when the flexible rope is in single-layer winding, the winding is started from the joint of a heat exchanger tube plate (1) at the end part of the heat exchanger shell (3) and a welding seam of the heat exchanger shell (3) as a starting end; when the flexible cable is wound in multiple layers, connecting welding seams of the heat exchanger tube plate (1) and the heat exchanger shell (3) are staggered to serve as winding starting points, and winding of the connecting pipe fitting (5) is started from a welding seam connecting position of the connecting pipe fitting (5) and the heat exchanger shell (3);
S3, after all the flexible wires (4) are wound, the flange rigidity enhancement ring (7) is assembled on the connecting pipe fitting (5), the flange rigidity enhancement ring (7) is arranged on the back surface of the flange on the connecting pipe fitting (5), a blind plate is fixed on the flange of the connecting pipe fitting (5), a pressure gauge assembly (6) is fixedly arranged on the blind plate, a sealing gasket (9) is arranged between the flange of the connecting pipe fitting (5) and the blind plate, the flange of the connecting pipe fitting (5) is connected with the blind plate through a bolt fastener (10), and the bolt fastener (10) is screwed by using a fastening wrench;
S4, injecting water into the shell side, and after the device for increasing the strength outside the heat exchanger shell (3) is completely installed, injecting water, wherein the temperature of the water is not lower than 5 ℃;
s5, boosting and stabilizing pressure of the equipment, slowly raising the test pressure, maintaining the pressure for 30 minutes after the test pressure reaches the specified test pressure, and carrying out leakage inspection on all welding seams and connecting parts, if leakage exists, carrying out a test again after repairing;
S6, releasing pressure, wherein no liquid leaks, no abnormal sound exists in the heat exchanger shell (3) and no visible deformation exists in the process of checking the step S5;
S7, repeatedly pressing, and repeating the operation of the step S5;
S8, completely releasing the pressure, performing the checking work of the step S6, and normally performing the complete pressure release;
S9, removing the flexible cable (8).
8. The method according to claim 7, wherein the loose area is checked after the winding of each layer of the flexible wires (4) is completed, and the loose area of each flexible wire (4) should not exceed 5% of the winding area of the flexible wires (4).
9. The method according to claim 7, further comprising the step of cleaning up impurities affecting the winding fitting effect on the surface of the heat exchanger case (3) before winding.
10. The method according to claim 7, further comprising the step of purging the interior of the heat exchanger shell (3) after the removal of the flexible cord (4) and sealing the inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711160340.0A CN107782631B (en) | 2017-11-20 | 2017-11-20 | Device for enhancing shell strength in heat exchanger tube head pressure test and pressure test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN1538136A (en) * | 2003-06-16 | 2004-10-20 | 吴植仁 | Folding pressure-resistant multipass biaxial flow screw plate heat exchanger |
| CN200968804Y (en) * | 2006-08-29 | 2007-10-31 | 浙江省东阳市四环防腐设备有限公司 | Overpressure resistant tubulation heat converter |
| CN102369410A (en) * | 2009-03-13 | 2012-03-07 | 毛里·康图 | Plate heat exchanger and method for improving pressure resistance of a plate heat exchanger |
| CN103162557A (en) * | 2011-12-14 | 2013-06-19 | 孟祥成 | Detachable pressure-tolerant spiral-plate heat exchanger |
| CN203894114U (en) * | 2014-03-07 | 2014-10-22 | 宁夏宝塔石化科技实业发展有限公司 | Hydraulic test tooling for floating head heat exchanger |
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| CN107782631A (en) | 2018-03-09 |
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