CN110715780A - Pressure testing device and pressure testing method for nodular cast iron pipe - Google Patents
Pressure testing device and pressure testing method for nodular cast iron pipe Download PDFInfo
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- CN110715780A CN110715780A CN201911186415.1A CN201911186415A CN110715780A CN 110715780 A CN110715780 A CN 110715780A CN 201911186415 A CN201911186415 A CN 201911186415A CN 110715780 A CN110715780 A CN 110715780A
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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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- 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
- G01N3/02—Details
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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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a pressure testing device and a pressure testing method for a nodular cast iron pipe, and belongs to the technical field of pipeline pressure testing. The invention provides a pressure test device for a nodular cast iron pipe, which aims to solve the problems that a backrest needs to be constructed during pressure test of the nodular cast iron pipe, the pressure test device is complex and the efficiency of the pressure test process is low in the prior art. The pressure testing device is simple in structure and easy to install; the pressure test method does not need to construct a backrest for the nodular cast iron pipe, and carries out the hydraulic pressure test on the nodular cast iron pipe through the steel pipe and the blocking plate in the steel pipe, so that the operation is simple and convenient, the construction process is saved, and the construction efficiency is accelerated.
Description
Technical Field
The invention belongs to the technical field of pipeline pressure test, and particularly relates to a pressure test device and a pressure test method for a nodular cast iron pipe.
Background
Pipeline pressure testing is an especially important step in pipeline construction, and according to design, standard requirement, the back is accomplished in the pipeline erection, and whether the section tubular product junction of suppressing is sealed, and whether inspection pressure reaches the operation requirement. In the conventional pressure test method for the large-diameter nodular cast iron pipe, in order to ensure that the pipeline is not disturbed, the pressure borne by the blocking plates at two ends must be transmitted and offset through the concrete backrest and original dense soil while covering soil to a certain extent, the mode has higher requirement on the soil quality of the back, and the pressure test can be carried out only when the concrete backrest needs to reach the strength; the process is relatively complicated and the construction is cumbersome, consuming time and labor.
Corresponding improvement is also carried out aiming at the problems, for example, Chinese patent application No. CN200410013979.2, published as 2004, 12 and 29, discloses a middle pressure test technology and a device for large-diameter pipeline construction. The pressure testing device consists of a steel pipe, a steel clapboard welded in the steel pipe, an H-shaped bypass pipe, a water injection pipe, a bypass valve, an exhaust valve and a pressure gauge, wherein the water injection pipe, the bypass valve, the exhaust valve and the pressure gauge are arranged on the bypass pipe. The device is connected with a pipeline for pressure test through a pipe joint. And (4) checking the leakage amount after water injection, then emptying the water to remove the steel partition plate, the bypass pipe and the like, and then sealing and welding. The invention overcomes the defect that the construction of the prior long-distance pipeline needs to be interrupted due to pressure test, and accelerates the construction progress of the project. The disadvantages of the patent are that: the simultaneous pressurization of the two sides is not easy to control the pressure of the two sides to be the same, and more hands are needed to increase the cost.
As another example, chinese patent application No. 201310453054.9, published as 2013, 12 and 25, discloses a method and a device for testing pressure of a water pipeline in a hilly area. The pressure test method comprises the following steps: (1) the water pipeline is provided with at least one pressure testing section, each pressure testing section is assembled and connected with a plugging plate and an expansion joint I to divide the pressure testing section into an upstream pressure testing section and a downstream pressure testing section, connecting pipes are respectively arranged at the bottoms of the upstream pressure testing section and the downstream pressure testing section of each pressure testing section, two branches are connected between the two connecting pipes in parallel, one branch is connected with a valve and an expansion joint II, and the other branch is connected with a pressure pump; each pressure testing section is provided with a pressure testing pier with a concrete structure side wall in a shape of a Chinese character 'hui' or a circular ring, the concrete structure side wall of the pressure testing pier is respectively and rigidly connected with the upstream and downstream pressure testing sections of the pressure testing section, and the plugging plate, the pressure pump and the like are positioned in a cavity of the pressure testing pier; (2) filling water to an upstream pressure test section and/or a downstream pressure test section of at least one pressure test section separately or simultaneously for pressure test; (3) and after the pressure test is finished, replacing the plugging plate with a through hole flange with a through hole to be connected with the water pipeline. The disadvantages of the patent are that: when independent pressure testing is carried out, pressure easily causes the two sections to collapse away due to pressure difference, and certain potential safety hazard is provided.
Disclosure of Invention
1. Problems to be solved
The invention provides a pressure testing device and a pressure testing method for a nodular cast iron pipe, aiming at the problems that in the prior art, a backrest needs to be constructed for pressure testing of the nodular cast iron pipe, the pressure testing device is complex and the efficiency of the pressure testing process is low. The pressure testing device is simple in structure and easy to install; in addition, the pressure test method does not need to construct a backrest for the nodular cast iron pipe, and carries out a hydraulic pressure test on the nodular cast iron pipe through the steel pipe and the blocking plate in the steel pipe, so that the operation is simple and convenient, the construction process is saved, and the construction efficiency is accelerated.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a pressure test device for a nodular cast iron pipe comprises the nodular cast iron pipe, wherein a water supply mechanism and a pressure test mechanism are arranged at one end of the nodular cast iron pipe, the other end of the nodular cast iron pipe is connected with one end of a steel pipe, the water supply mechanism and the pressure test mechanism are arranged at the other end of the steel pipe, a blocking plate which divides the steel pipe into a front section of steel pipe body and a rear section of steel pipe body is arranged in the steel pipe, a water inlet pipeline is arranged outside the front section of steel pipe and the rear section of steel pipe, the pressure test mechanism is arranged on the water. Simple structure, easily installation and dismantlement simplify the pressure testing procedure, save the water resource.
Furthermore, the water supply mechanism comprises a water inlet tank, a water inlet main pipe connected with the water inlet tank, and two water inlet branch pipes connected with the water inlet main pipe, wherein a water inlet main valve is arranged on the water inlet main pipe, a pressure test pump and a pressure valve are arranged on one water inlet branch pipe, and a water inlet branch valve is arranged on the other water inlet branch pipe. The division of labor is clear, and the operation efficiency is improved.
Furthermore, the water inlet branch pipes are provided with check valves. The safety performance of the whole water inlet process is improved, and water backflow is prevented.
Furthermore, the ductile cast iron pipe and the steel pipe are both provided with a water drain pipeline, the water drain pipeline is provided with a water drain valve, and the water drain pipeline is connected with a water supply mechanism. And the water resource is recycled, so that the waste of the water resource is avoided.
Furthermore, the water drain pipeline is connected with the nodular cast iron pipe and the steel pipe through flanges. The installation and the replacement of the water drain pipeline are convenient, and the flange connection relationship is stable.
Furthermore, the pressure measuring mechanism on the water inlet pipeline is a pressure gauge II, and the pressure gauge II is arranged on the water inlet pipeline through a support. Simple structure, the measuring result is comparatively accurate.
Furthermore, the alarm device is electrically connected with the pressure gauge II. The timeliness of the whole hydrostatic test process is improved, and when the pressure exceeds the preset value of the pressure gauge II, the alarm works to remind workers of paying attention in time.
Furthermore, a manhole for an operator to enter and exit the steel pipe is arranged on the steel pipe. The installation and the dismantlement of jam plate are made things convenient for.
A pressure testing method using the pressure testing device for the ductile cast iron pipe comprises the following steps:
one end of a nodular cast iron pipe is connected with a steel pipe, and a blocking plate is arranged in the steel pipe;
opening two water feeding valves and exhaust valves on the water inlet pipeline, and filling water into the nodular cast iron pipe and the steel pipe through a water inlet mechanism at one end of the nodular cast iron pipe or a water inlet mechanism at one end of the steel pipe;
thirdly, after the nodular cast iron pipe and the steel pipe are filled with water, the nodular cast iron pipe and the steel pipe are continuously pressed by water inflow of the water inflow mechanism, and after pressing is finished, a water supply valve close to the nodular cast iron pipe is closed;
fourthly, carrying out a hydrostatic test on a section of the steel pipe far away from the nodular cast iron pipe;
fifthly, after the hydraulic test of the section of the steel pipe body far away from the nodular cast iron pipe is completed, opening a water feeding valve close to the nodular cast iron pipe, wherein the nodular cast iron pipe and the steel pipe body connected with the nodular cast iron pipe form a common pipeline, and closing the water feeding valve far away from the nodular cast iron pipe when the pressure measuring mechanism detects that the pressure of the pipeline and the pressure of the section of the steel pipe body far away from the nodular cast iron pipe reach pressure balance;
sixthly, performing a hydraulic test on a section of steel pipe close to the nodular cast iron pipe;
seventhly, after the pressure test of the nodular cast iron pipe is finished, an operator removes the blocking plate.
The method is simple and convenient to operate, changes the condition that the backrest needs to be manufactured and constructed independently in the past, compresses and optimizes the construction process, saves manpower, material resources and financial resources, accelerates the pressure test progress, and can satisfactorily complete the pressure test work of the nodular cast iron pipe 11 on the premise of ensuring the quality.
Furthermore, the intensity of pressing the nodular cast iron pipe and the steel pipe in the third step is half of the intensity of the pressure test. Convenient control and easy operation.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, one end of the nodular cast iron pipe to be tested is connected with the steel pipe, and the blocking plate for dividing the steel pipe into two sections is arranged in the steel pipe, so that the arrangement of the steel pipe avoids the need of separate pressing and backrest manufacturing when the traditional nodular cast iron pipe is subjected to a hydrostatic test, the construction process is simplified, and the resource investment is reduced; meanwhile, a water inlet pipeline is arranged between the two sections of steel pipe bodies, and two water feeding valves and exhaust valves are arranged on the water inlet pipeline, so that the two sections of steel pipe bodies are subjected to segmented pressure testing, the pressure testing procedure is simplified, water resources are saved, and the overall construction progress is accelerated;
(2) the water supply mechanism is provided with two water inlet branch pipes, one water inlet branch pipe is provided with a pressure test pump and a pressure valve for pressure test operation, the other water inlet branch pipe is provided with a water inlet branch valve for pipeline water injection operation at the early stage of pressure test, the pressure test pump and the pressure valve are not needed in the early stage pipeline water injection operation, only ordinary water is needed, and due to the arrangement of the two water inlet branch pipes, the error of operators is avoided, the labor distribution accuracy is improved, and the smooth operation of the whole hydraulic test process is ensured;
(3) the check valves are arranged on the water inlet branch pipes, so that the phenomenon of reverse flow when water flow is conveyed into a pipeline can be effectively avoided, and the safety performance of the water inlet process is ensured; the pressure test pump is a pneumatic pump, the pneumatic pump is simple in structure and small in size, and the bearing of the water inlet branch pipe is reduced;
(4) according to the invention, the drain pipelines are arranged on the nodular cast iron pipe and the steel pipe respectively, and the drain valves are arranged on the drain pipelines, so that water flow in the nodular cast iron pipe and the steel pipe can be conveniently discharged; the water drainage pipeline is connected with the water supply mechanism, so that water resources used in the whole hydrostatic test can be recycled, and the waste of the water resources is avoided;
(5) the pressure measuring mechanism on the water inlet pipeline is the pressure gauge II, the pressure gauge II is simple in structure and accurate in measuring effect, and an operator can conveniently and intuitively and quickly read a pressure value; the pressure gauge II is arranged on the water inlet pipeline through the support, so that the fixation of the pressure gauge II is enhanced, the pressure measurement result is more accurate, and the measurement error of the steel pipe is reduced; the pressure gauge II is electrically connected with the alarm, and when the pressure value exceeds a preset pressure value, the alarm works to remind workers of paying attention in time;
(6) the blocking plate is arranged at the middle section of the steel pipe, and because the steel pipe bodies on two sides of the blocking plate need to be pressed before a hydrostatic test, the pressure of the steel pipe bodies on two sides of the blocking plate is easy to control and balance when the blocking plate is arranged at the middle section of the steel pipe; meanwhile, the welding of the blocking plate and the steel pipe ensures the connection stability between the blocking plate and the steel pipe; a manhole for operators to enter and exit is arranged on the steel pipe, so that the installation and the disassembly of the blocking plate are convenient, and the working efficiency is improved;
(7) according to the pressure test method, water is filled into the nodular cast iron pipe and the steel pipe and pressure is applied to the nodular cast iron pipe and the steel pipe, so that a certain pressure is kept in the nodular cast iron pipe and the steel pipe before the hydrostatic test is carried out, the condition that the two sections of steel pipes are easy to collapse due to large pressure difference when the hydrostatic test is carried out on one section of steel pipe is prevented, and the construction is not smooth, and the safety performance of the whole pressure test process is ensured; on the other hand, because the pressure of the pressure testing device is certain, only the pressure is increased step by step on the basis, so that the pressure testing time is saved, and meanwhile, the water resource is saved; the whole pressure test method for the nodular cast iron pipe is simple and convenient to operate, high in efficiency and cost-saving.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
In the figure: 1. a main water inlet valve; 2. a pressure test pump; 3. a pressurization valve; 4. a water inlet and outlet valve; 5. a water drain valve; 6. a pressure gauge I; 7. a pressure gauge II; 8. a water supply valve I; 9. a water feeding valve II; 10. an exhaust valve; 11. a ductile iron pipe; 12. a steel pipe; 13. and (6) blocking plates.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
As shown in fig. 1 and 2, the pressure testing device for the ductile cast iron pipe comprises a ductile cast iron pipe 11, wherein the ductile cast iron pipe 11 is a pipe to be tested in a hydrostatic test; one end of the nodular cast iron pipe 11 is provided with a water supply mechanism and a pressure measuring mechanism, the other end of the nodular cast iron pipe 11 is connected with one end of a steel pipe 12, and the other end of the steel pipe 12 is provided with a water supply mechanism and a pressure measuring mechanism; specifically, the water supply mechanisms on the nodular cast iron pipe 11 and the steel pipe 12 are mechanisms for supplying water for the whole hydrostatic test, specifically, the water supply mechanism comprises a water inlet tank, a water inlet main pipe connected with the water inlet tank, and two water inlet branch pipes connected with the water inlet main pipe, wherein a water inlet main valve 1 is arranged on the water inlet main pipe, a pressure test pump 2 and a pressure valve 3 are arranged on one water inlet branch pipe, a water inlet branch valve 4 is arranged on the other water inlet branch pipe, one end of each of the two water inlet branch pipes is connected with the water inlet main pipe, and the other end of each of the two water inlet branch pipes is connected with the nodular cast iron pipe 11 or the steel pipe; when water is injected into the nodular cast iron pipe 11 and the steel pipe 12 in the early stage of the hydrostatic test, the water inlet main valve 1 and the water inlet branch valve 4 are opened, the pressure test pump 2 and the pressure valve 3 are in a closed state, and water flows enter the two pipelines through the water inlet branch valve 4 to enable the two pipelines to be filled with water flows; when the two pipelines need to be subjected to boosting operation, the water inlet water distributing valve 4 is closed, the main water inlet valve 1, the pressure test pump 2 and the pressurizing valve 3 are opened, and water flows into the two pipelines through the pressure test pump 2 and the pressurizing valve 3 to perform boosting operation on the two pipelines; the two water inlet pipelines are arranged, so that the division of labor in the whole operation process is clear, the waste of resources caused by unnecessary use of the pressure test pump 2 and the pressure valve 3 is avoided, and the error of operators is reduced; specifically, the pressure measuring mechanism is a pressure gauge I6, the pressure gauge I6 is simple in structure, the measuring effect is accurate, and an operator can conveniently and visually obtain readings quickly; the two pressure gauges I6 are respectively and vertically arranged on the nodular cast iron pipe 11 and the steel pipe 12 through a support, so that the measuring structure is more accurate; other water supply mechanisms and pressure measuring mechanisms which can provide water resources for the hydrostatic test of the nodular cast iron pipes 11 and the steel pipes 12 can be used in the invention;
the steel pipe 12 is internally provided with the blocking plate 13 which divides the steel pipe 12 into a front section of steel pipe body and a rear section of steel pipe body, particularly, the blocking plate 13 is welded inside the steel pipe 12, the welding connection mode is stable, and the blocking plate 13 can be effectively prevented from being separated from the steel pipe 12 under the impact of water flow with higher pressure; the arrangement of the blocking plate 13 divides the steel pipe 12 into a front half steel pipe body connected with the nodular cast iron pipe 11 and a rear half steel pipe body connected with the water supply mechanism; a water inlet pipeline is arranged outside between the front steel pipe body and the rear steel pipe body, namely one end of the water inlet pipeline is connected with the front half steel pipe body, and the other end of the water inlet pipeline is connected with the rear half steel pipe body; the water inlet pipeline is provided with a pressure measuring mechanism, and both sides of the pressure measuring mechanism are provided with a water feeding valve and an exhaust valve 10; specifically, the water feeding valves are divided into a water feeding valve I8 and a water feeding valve II9 which are respectively arranged on two sides of the pressure measuring mechanism, the water feeding valve I8 is close to the nodular cast iron pipe 11 and is arranged on a water inlet pipeline corresponding to the front half section of the steel pipe body, and the water feeding valve II9 is arranged on a water inlet pipeline corresponding to the rear half section of the steel pipe body; the pressure measuring mechanism on the water inlet pipeline is a pressure gauge II7, the pressure gauge II7 is simple in structure and accurate in measuring effect, and an operator can conveniently and intuitively and quickly read a pressure value; the pressure gauge II7 is arranged in a vertical water inlet pipeline, so that the measurement result is more accurate; the operation personnel realize carrying out the segmentation hydrostatic test to the steel pipe body of two different sections through adjusting opening or closing of two water feeding valves, namely finally accomplish the hydrostatic test to nodular cast iron pipe 11, the setting up of discharge valve 10 one helps discharging the air in nodular cast iron pipe 11 and steel pipe 12, makes the operation personnel can detect directly perceivedly that two kinds of pipelines have been filled with water for whole operation has higher security performance.
The pressure test device for the ductile cast iron pipe, disclosed by the invention, has the advantages that the steel pipe 12 connected with the ductile cast iron pipe 11 serves as a backrest, so that the operation that the traditional ductile cast iron pipe needs to be constructed to counteract the pressure when a hydrostatic test is carried out on the ductile cast iron pipe is eliminated, the construction process is simplified, and the material cost and the labor cost are saved; the arrangement of the blocking plate 13 divides the steel pipe 12 into two sections of steel pipe bodies, when one section of the steel pipe body is subjected to pressure test, the other section of the steel pipe body serves as a backrest to play a supporting role, and certain safety accidents caused by the fact that two sides of the blocking plate 13 fall off from the steel pipe 12 due to large pressure difference during the hydrostatic test are avoided; in the past, when the ductile cast iron pipe 11 is subjected to a hydrostatic test, the efficiency of the whole hydrostatic test is low due to the independent manufacture and construction of the backrest, and a large amount of manpower and material resources are consumed for installing and disassembling the traditional backrest; the pressure testing process is simplified and the water resource is saved by carrying out the operation of sectional pressure testing through the pressure testing mechanism and the water feeding valve on the water inlet pipeline; secondly, the overall construction progress is accelerated; the whole device is simple in structure, easy to install and detach and high in use value.
Example 2
Basically as in embodiment 1, preferably, the water inlet branch pipes are provided with check valves, and the check valves can effectively prevent water from flowing reversely during water injection or pressure boosting operation, so as to ensure the safety performance of the whole pressure test process; furthermore, the pressure test pump 2 is a pneumatic pump, the pneumatic pump is simple in structure and small in size, the bearing of the water inlet branch pipe is reduced, and the service life of the water inlet branch pipe is prolonged; more specifically, the ductile cast iron pipe 11 and the steel pipe 12 are both provided with a drain pipeline, the drain pipeline is provided with a drain valve 5, and the drain pipeline is connected with a water supply mechanism; the discharge of water flow in the nodular cast iron pipe 11 and the steel pipe 12 is convenient; the water escape valve 12 is connected with the water supply mechanism through a pipeline, so that water resources are recycled, waste of the water resources is avoided, and cost is saved; in this embodiment, the drain valve 5 can be connected to the water inlet tank of the water supply mechanism described in embodiment 1 through a pipeline to store and utilize the recovered water resource; furthermore, the drain pipeline is connected with the nodular cast iron pipe 11 and the steel pipe 12 through flanges, the flanges are detachably mounted, the drain pipeline is convenient to mount and replace, and the flanges are connected to enable the connection relationship to be stable.
Example 3
Basically as in embodiment 2, preferably, the blocking plate 13 is disposed at the middle position of the steel pipe 12, that is, at the middle position of the steel pipe 12, and because the steel pipe bodies on both sides of the blocking plate 13 need to be pressurized before the hydraulic test, the blocking plate 13 disposed at the middle position of the steel pipe 12 makes it easier to control and balance the pressure of the steel pipe bodies on both sides during pressurization; the pressure gauge II7 corresponds to the position of the blocking plate 13, so that the pressure gauge II7 can measure the pressure of the front and rear steel pipe bodies more accurately; furthermore, the automatic pressure testing device also comprises an alarm, the alarm is electrically connected with the pressure gauge II7, when the value of the pressure gauge II7 exceeds a preset value, a signal is transmitted to the alarm, the alarm works to remind workers of attention in time, the safety performance of the whole process is improved, and the preset value is generally set according to the specific pressure testing condition of the nodular cast iron pipe 11 on site; furthermore, a manhole for an operator to enter and exit the steel pipe 12 is arranged on the steel pipe 12, so that the installation and the disassembly of the blocking plate 13 are facilitated for the operator.
Example 4
A pressure testing method using the pressure testing device for ductile iron pipes according to any one of embodiments 1 to 3, comprising the steps of:
firstly, connecting one end of a nodular cast iron pipe 11 with a steel pipe 12, and arranging a blocking plate 13 in the steel pipe 12;
opening two water feeding valves and an exhaust valve 10 on a water inlet pipeline, and filling water into the nodular cast iron pipe 11 and the steel pipe 12 through a water inlet mechanism at one end of the nodular cast iron pipe 11 or a water inlet mechanism at one end of the steel pipe 12; specifically, in this embodiment, a water inlet mechanism at one end of the steel pipe 12 is opened to deliver water resources, and the water inlet mechanism is as described in embodiment 1; opening a water inlet main valve 1 and a water inlet branch valve 4, closing a pressure test pump 2 and a pressure valve 3, enabling a part of water flow to enter a rear half section steel pipe body connected with the water inlet branch pipe through the water inlet branch pipe, and enabling the other part of water flow to enter the front half section steel pipe body and the nodular cast iron pipe 11 through a water inlet pipeline because the water flow cannot directly enter the front half section steel pipe body connected with the nodular cast iron pipe 11 from the rear half section steel pipe body due to the existence of a blocking plate 13; at the moment, the water feeding valve I8, the water feeding valve II9 and the exhaust valve 10 on the water inlet pipeline are opened, when water flows overflow outwards from the exhaust valve 10, the pipeline is full of water, and water injection into the nodular cast iron pipe 11 and the steel pipe 12 is stopped;
thirdly, after the nodular cast iron pipe 11 and the steel pipe 12 are filled with water, the nodular cast iron pipe 11 and the steel pipe 12 are continuously pressed by water inflow of the water inflow mechanism, and after pressing is finished, the water feeding valve close to the nodular cast iron pipe 11 is closed; specifically, after the ductile cast iron pipe 11 and the steel pipe 12 are filled with water, the water inlet and outlet valve 4 is closed, the water inlet main valve 1, the pressure test pump 2 and the pressure valve 3 are opened to inject water and pressurize the steel pipe 12 and the ductile cast iron pipe 11, and the pressure value can be determined according to specific conditions, so that the ductile cast iron pipe 11 and the steel pipe 12 have certain pressure before the hydrostatic test is carried out; due to the arrangement, the situation that the plugging plate 13 is easily broken and the steel pipe 12 is broken due to large water pressure difference of the steel pipe bodies on the two sides of the plugging plate 13 when the front half section steel pipe body or the rear half section steel pipe body is subjected to a hydrostatic test independently can be avoided, and the safety performance of the whole process is ensured; after the pressurization is finished, closing the water inlet main valve 1, the pressure test pump 2, the pressurizing valve 3 and a water feeding valve II9 close to the nodular cast iron pipe 11; preparing for carrying out a hydrostatic test on the rear half-section steel pipe body connected with the pressure testing mechanism in the next step; preferably, the intensity of water injection and pressure pressing of the nodular cast iron pipe 11 and the steel pipe 12 is half of the pressure testing intensity; the operation and control are convenient, and when the numerical value displayed on the pressure gauge I6 on the nodular cast iron pipe 11 and the steel pipe 12 is half of the pressure testing pressure value, the water injection is stopped;
fourthly, carrying out a hydrostatic test on a section of the steel pipe body far away from the nodular cast iron pipe 11; specifically, the hydraulic test is specifically operated as follows: one end of the steel pipe body is connected with a water feeding mechanism, the steel pipe body is a rear half steel pipe body, a water inlet water dividing valve 4 is closed, a water inlet main valve 1, a pressure test pump 2 and a pressure valve 3 are opened, water flow enters the rear half steel pipe body through a water inlet branch pipe, and the water feeding valve II9 is in a closed state, so that the water flow cannot enter the front half steel pipe body connected with the nodular cast iron pipe 11; slowly raising the water flow pressure to the test pressure, and if the pressure is reduced, filling water to supplement the pressure, but not being higher than the test pressure; checking whether water leakage and damage occur at the pipeline interface, fittings and the like; the pressure test should be stopped in time when water leakage and damage occur, the reason is found out, corresponding measures are taken, then the pressure test is carried out again, the water injection and pressure compensation are stopped, the operation is stable for 15min, after 15min, the pressure of the section of steel pipe body is not reduced, the test pressure is increased to the working pressure and kept constant for 30min, and if no water leakage occurs in the appearance inspection, the section of steel pipe body is qualified in the hydrostatic test; during the process, the pressure can be observed and adjusted through a pressure gauge I6 arranged on the steel pipe 12;
fifthly, after the hydraulic test of the section of the steel pipe body far away from the nodular cast iron pipe 11 is completed, the water feeding valve close to the nodular cast iron pipe 11 is opened, at the moment, the nodular cast iron pipe 11 and the steel pipe body connected with the nodular cast iron pipe 11 form a common pipeline, and when the pressure of the pipeline detected by the pressure measuring mechanism and the pressure of the section of the steel pipe body far away from the nodular cast iron pipe 11 reach pressure balance, the water feeding valve far away from the nodular cast iron pipe 11 is closed; specifically, after the hydraulic test of the rear half-section steel pipe body is completed, the water feeding valve II9 closed on the front water inlet pipeline is opened, so that water flow in the rear half-section steel pipe body enters the front half-section steel pipe body and the nodular cast iron pipe 11, the pressure gauge II7 on the water inlet pipeline is observed, when a pointer on the pressure gauge II7 is at a half position of a dial, the pressure of the pipeline formed by the nodular cast iron pipe 11 and the front half-section steel pipe body is balanced with the pressure of the rear half-section steel pipe body, and the water feeding valve I8 is closed, so that preparation is made for the next hydraulic test of the nodular cast iron pipe 11;
sixthly, carrying out a hydraulic test on the nodular cast iron pipe 11; specifically, the hydraulic test is specifically operated as follows: at the moment, a water supply mechanism at one end of the nodular cast iron pipe 11 works, the water inlet branch valve 4 is closed, the water inlet main valve 1, the pressure test pump 2 and the pressure valve 3 are opened, water flow enters the front half section of steel pipe body connected with the nodular cast iron pipe 11 through the water inlet branch pipe, and the water supply valve I8 is in a closed state, so that the water flow cannot enter the rear half section of steel pipe body; slowly raising the water flow pressure to the test pressure, and if the pressure is reduced, filling water to supplement the pressure, but not being higher than the test pressure; checking whether water leakage and damage occur at the pipeline interface, fittings and the like; the pressure test should be stopped in time when water leakage and damage occur, causes should be found out, and the pressure test should be carried out again after corresponding measures are taken, the water injection and pressure compensation are stopped, the operation is stable for 15min, the pressure of the nodular cast iron pipe 11 is reduced to be not more than 0.03MPa after 15min, the test pressure is switched to the working pressure and kept constant for 30min, and if no water leakage occurs in the appearance inspection, the hydraulic pressure test of the nodular cast iron pipe 11 is qualified; during the process, the pressure can be observed and adjusted through a pressure gauge I6 arranged on the nodular cast iron pipe 11; when the ductile cast iron pipe 11 is subjected to the hydrostatic test, the first half section of the steel pipe body has pressure due to the operation of the second step and the fifth step, and the pressure is gradually increased on the basis of the pressure, so that the time and the construction cost of the hydrostatic test are saved, and the waste of water resources is avoided to a certain extent; the rear half steel pipe body also has pressure, and when the ductile cast iron pipe 11 is subjected to a hydrostatic test, the rear half steel pipe body serves as a backrest, so that the phenomenon that the blocking plate 13 is separated from the steel pipe 12 due to large pressure difference on two sides of the blocking plate 13 is avoided;
seventhly, after the pressure test of the nodular cast iron pipe 11 is finished, an operator removes the blocking plate 13 and empties the water in the nodular cast iron pipe 11 and the steel pipe 12.
The pressure test method disclosed by the invention has the advantages that the construction process is compressed and optimized, the manpower, material resources and financial resources are saved, the pressure test progress is accelerated, and the pressure test work of the nodular cast iron pipe 11 can be satisfactorily completed on the premise of ensuring the quality; the method has the advantages that water is filled into the nodular cast iron pipe 11 and the steel pipe 12 and pressure is applied to the nodular cast iron pipe 11 and the steel pipe 12, so that the interiors of the nodular cast iron pipe 11 and the steel pipe 12 have certain pressure before hydrostatic test is carried out, and the steel pipe 12 serves as a backrest, so that the condition that construction is not smooth due to the fact that the blocking plates 13 are easy to collapse due to large pressure difference when the hydrostatic test is carried out on the steel pipe 12 or the nodular cast iron pipe 11 independently is prevented, the safety performance of the whole pressure test process is guaranteed, the fact that the backrest needs to be manufactured and constructed independently when the conventional hydrostatic test operation is carried out on the nodular cast iron pipe 11 is changed, construction procedures are saved, and; on the other hand, because the nodular cast iron pipe 11 and the steel pipe 12 have certain pressure, only step-by-step pressure boosting is needed on the basis, so that the pressure testing time is saved, and meanwhile, the water resource is saved; in the prior art, the two ends of the nodular cast iron pipe 11 are simultaneously stressed, so that the number of operators is increased; secondly, due to the influence of various factors, simultaneous pressurization of the two ends is not convenient to control, the two ends can be pressurized to the test pressure at the same time, and water entering the two ends at the same time to reach the test pressure consumes a large amount of water resources, so that the overall cost is high; the whole pressure test method for the nodular cast iron pipe 11 is simple and convenient to operate, high in efficiency and cost-saving.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a nodular cast-iron pipe pressure testing device, includes nodular cast-iron pipe (11), and the one end of nodular cast-iron pipe (11) is provided with water supply mechanism and pressure measurement mechanism, its characterized in that: the ductile iron pipe is characterized in that the other end of the ductile iron pipe (11) is connected with one end of a steel pipe (12), the other end of the steel pipe (12) is provided with a water supply mechanism and a pressure measuring mechanism, a blocking plate (13) which divides the steel pipe (12) into a front section of steel pipe body and a rear section of steel pipe body is arranged in the steel pipe (12), a water inlet pipeline is arranged outside the front section of steel pipe body and the rear section of steel pipe body, the pressure measuring mechanism is arranged on the water inlet pipeline, and a water feeding valve.
2. The ductile cast iron pipe pressure testing device according to claim 1, characterized in that: the water supply mechanism comprises a water inlet tank, a water inlet main pipe connected with the water inlet tank, two water inlet branch pipes connected with the water inlet main pipe, a water inlet main valve (1) is arranged on the water inlet main pipe, a pressure test pump (2) and a pressure valve (3) are arranged on one water inlet branch pipe, and a water inlet branch valve (4) is arranged on the other water inlet branch pipe.
3. The ductile cast iron pipe pressure testing device according to claim 2, characterized in that: and the water inlet branch pipes are provided with check valves.
4. The ductile cast iron pipe pressure testing device according to claim 1 or 2, characterized in that: and water drain pipelines are arranged on the ductile cast iron pipe (11) and the steel pipe (12), a water drain valve (5) is arranged on each water drain pipeline, and the water drain pipelines are connected with a water supply mechanism.
5. The ductile cast iron pipe pressure testing device according to claim 4, characterized in that: the water drain pipeline is connected with the nodular cast iron pipe (11) and the steel pipe (12) through flanges.
6. The ductile cast iron pipe pressure testing device according to claim 1, characterized in that: the pressure measuring mechanism on the water inlet pipeline is a pressure gauge II (7), and the pressure gauge II (7) is arranged on the water inlet pipeline through a support.
7. The pressure testing device for the ductile cast iron pipe according to claim 6, characterized in that: the alarm is electrically connected with the pressure gauge II (7).
8. The ductile cast iron pipe pressure testing device according to claim 1, characterized in that: and a manhole for an operator to enter and exit the steel pipe (12) is arranged on the steel pipe (12).
9. A pressure test method using the pressure test apparatus for ductile iron pipes as claimed in any one of claims 1 to 8, characterized in that: the method comprises the following steps:
one end of a nodular cast iron pipe (11) is connected with a steel pipe (12), and a blocking plate (13) is arranged in the steel pipe (12);
opening two water feeding valves and two exhaust valves (10) on the water inlet pipeline, and filling water into the nodular cast iron pipe (11) and the steel pipe (12) through a water inlet mechanism at one end of the nodular cast iron pipe (11) or a water inlet mechanism at one end of the steel pipe (12);
thirdly, after the nodular cast iron pipe (11) and the steel pipe (12) are filled with water, the nodular cast iron pipe (11) and the steel pipe (12) are continuously pressed by water inflow through the water inflow mechanism, and after the pressing is finished, the water feeding valve close to the nodular cast iron pipe (11) is closed;
fourthly, carrying out a hydrostatic test on a section of the steel pipe body far away from the nodular cast iron pipe (11);
fifthly, after the hydraulic test of the section of the steel pipe body far away from the nodular cast iron pipe (11) is completed, a water feeding valve close to the nodular cast iron pipe (11) is opened, at the moment, the nodular cast iron pipe (11) and the steel pipe body connected with the nodular cast iron pipe (11) form a pipeline, and when the pressure of the pipeline detected by a pressure measuring mechanism and the pressure of the section of the steel pipe body far away from the nodular cast iron pipe (11) reach pressure balance, the water feeding valve far away from the nodular cast iron pipe (11) is closed;
sixthly, carrying out a hydraulic test on the nodular cast iron pipe (11);
seventhly, after the pressure test of the nodular cast iron pipe (11) is finished, an operator removes the blocking plate (13).
10. The pressure testing method for the ductile cast iron pipe as claimed in claim 9, wherein: and in the third step, the intensity of pressing the nodular cast iron pipe (11) and the steel pipe (12) is half of the pressure testing intensity.
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| CN201911186415.1A CN110715780A (en) | 2019-11-28 | 2019-11-28 | Pressure testing device and pressure testing method for nodular cast iron pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111982696A (en) * | 2020-08-28 | 2020-11-24 | 江西勃尧建设有限公司 | Pipeline pressure measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111982696A (en) * | 2020-08-28 | 2020-11-24 | 江西勃尧建设有限公司 | Pipeline pressure measuring device |
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