CN103575595A - Method for evaluating point load performance of plastic tube - Google Patents
Method for evaluating point load performance of plastic tube Download PDFInfo
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- CN103575595A CN103575595A CN201210262860.3A CN201210262860A CN103575595A CN 103575595 A CN103575595 A CN 103575595A CN 201210262860 A CN201210262860 A CN 201210262860A CN 103575595 A CN103575595 A CN 103575595A
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Abstract
The invention relates to a method for evaluating the point load performance of a plastic tube. The method comprises the following steps: 1, forming a notch on the outer wall of the plastic tube, wherein the depth of the notch is lower than the wall thickness of the plastic tube; 2, allowing the formed notched plastic tube to be full of a first liquid, and sealing two ends of the plastic tube to obtain a plastic tube sample for detection; and 3, putting the plastic tube sample for detection in a sealable container, allowing the sealable container to be full of a second liquid, sealing the sealable container, and carrying out hydrostatic test. The method for evaluating the point load performance of the plastic tube substantially shortens the evaluation time, and the dispersivity of evaluation results is small.
Description
Technical field
The present invention relates to a kind of method of evaluating the point load performance of plastic pipe.
Background technology
Along with the application and development of the non-traditional field engineerings such as efficient, low cost, eco-friendly non-excavation (as booster method, plough into method, directional drilling method, without sand landfill etc.), more and more higher to the requirement of the resistance to point load performance of plastic pipe.While adopting the nontraditional technologies such as non-excavation to install plastic pipe, outer surface of plastic pipe is easy to be subject to the scraping of rock, causes scratching formation micro-crack; Even the corner angle of stone are pressed into the certain degree of depth of outer pipe wall.Reality is more than installed and causes plastic pipe when bearing operation, to bear extra partial points load, this type of point load is to having material impact the serviceable life of plastic pipe.Therefore, plastic pipe PP Pipe Compound is carried out to resistance to point load performance evaluation, select suitable material with meet for the serviceable life of the plastic pipe of the non-traditional field engineerings such as non-excavation very important.
At present, for non-traditional field engineering fields such as non-excavations, develop the Polyethylene Pipe Resin with excellent resistibility of slow crack growth performance.Such as, the polyvinyl resin of the trades mark such as XSC 50 Orange, the XRC 20B that in market, visible Total SA develops, XSC 50Blue; The polyvinyl resin of the trades mark such as HE3490LS-H, HE3492LS-H of company of Borealis exploitation; The TUB121N6000 polyvinyl resin of Ineos company exploitation; The CRP 100 Resist polyvinyl resins of LyondellBasell company exploitation.These polyvinyl resins have excellent resistibility of slow crack growth performance, by full notch creep failure test, evaluate sign: in 80 ℃, the environment of the Arkopal N100 surfactant solution of 2 % by weight, under the condition of 4MPa drawing stress, these polyvinyl resins can keep surpassing and are not destroyed for 8760 hours.
At present, do not have in the world the evaluation method of standard to evaluate the resistance to point load performance of above-mentioned polyvinyl resin.Document < < Minimum service-life of buried polyethylene pipes without sand-embedding > > (Hessel, 3R international, 2001, 40, 178-184 page and 360-366 page) reported a kind of method of evaluating the resistance to point load performance of polyvinyl resin, the method is pressed into plastic pipe outer wall certain depth by the steel ball that is 10mm by a diameter, at 80 ℃, in the environment of Arkopal N 100 surfactant solutions of 2 % by weight, under the condition of 4MPa ring stress, test, the time length of destroying with tubing is evaluated the quality of the resistance to point load performance of tubing.Above-mentioned polyvinyl resin adopts above Hessel test method to test, and time to rupture is up to more than 8760 hours.For the test method of Hessel, chronic on the one hand, the evaluation time of overlength is difficult to polyethylene resin feedstock exploitation guidance is provided, and is also difficult to carry out quality control for tubing manufacturing enterprise; On the other hand, different steel ball load mode in the test method of Hessel, may produce certain impact to plastic pipe, have very large human factor in loading procedure, the test findings obtaining between various sample and laboratory has larger dispersiveness.
Summary of the invention
The object of the invention is in order to overcome the method life period of point load performance of existing evaluation polyvinyl resin long, and be difficult to simulate the defect that actual buried tubing bears the truth of point load, a kind of method of point load performance of new evaluation plastic pipe is provided.
The invention provides a kind of method of evaluating the point load performance of plastic pipe, the method comprises: (1) forms breach on the outer wall of plastic pipe, and the degree of depth of described breach is less than the wall thickness of described plastic pipe; (2) in forming plastic pipe jaggy, be full of first liquid, and by the closed at both ends of plastic pipe, obtain plastic pipe sample to be detected; (3) described plastic pipe sample to be detected is placed in closed container, and is full of second liquid in described closed container, then by described closed container closure, and carry out hydrostatic test.
In the method for the point load performance of described evaluation plastic pipe of the present invention, first at the outer wall of plastic pipe, introduce the breach of definite shape, inside and outside plastic pipe, apply again different hydrostatic, under inside and outside hydrostatic effect, stressed basic condition that can the buried tubing of visual simulation, simultaneously in the indentation, there of outer pipe wall, due to the introducing of local geometric defect, obtain stress raisers, thus the point load effect in can Reality simulation situation.Therefore it is feasible, adopting the point load performance of described method evaluation plastic pipe of the present invention.
And the method for the point load performance of described evaluation plastic pipe provided by the invention can significantly shorten evaluation time; And links and operating parameter can accurately be controlled in described method, artifical influence factor is less, makes that final test findings is reliable and dispersiveness is less.
In addition, method according to the present invention can be used for evaluating the quality of quality of the resin raw material of this plastic pipe of preparation to the evaluation result of the point load performance of plastic pipe.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the schematic diagram that forms plastic pipe jaggy;
Fig. 2 is the partial schematic diagram of the breach on plastic pipe;
Fig. 3 is the schematic diagram of method of the point load performance of described evaluation plastic pipe provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The method of the point load performance of evaluation plastic pipe according to the present invention comprises the following steps:
(1) on the outer wall of plastic pipe, form breach, the degree of depth of described breach is less than the wall thickness of described plastic pipe;
(2) in forming plastic pipe jaggy, be full of first liquid, and by the closed at both ends of plastic pipe, obtain plastic pipe sample to be detected;
(3) described plastic pipe sample to be detected is placed in closed container, and is full of second liquid in described closed container, then by described closed container closure, and carry out hydrostatic test.
In step (1), the method that forms breach on the outer wall of plastic pipe can be implemented according to conventional method, for example, can adopt drill bit to punch, and also can adopt milling cutter to carry out machine work.
In step (1), there is no particular limitation for the size of described plastic pipe.Yet in order to reduce error of quality appraisement and to guarantee that described method of the present invention is convenient to implement, preferably, the external diameter of described plastic pipe is 4-40:1, more preferably 5-20:1 with the ratio (SDR) of wall thickness.The length-diameter ratio of described plastic pipe (being length and the ratio of overall diameter) can be 3-20:1, is preferably 5-10:1.
In the present invention, there is no particular limitation for the material of described plastic pipe, can be the tubing for fields such as combustion gas, feedwater common on market or pipeline.The material of described plastic pipe can be for example tygon, polypropylene, polybutylene or Polyvinylchloride.
In step (1), the object that forms breach on the outer wall of described plastic pipe is in order to obtain stress raisers, thereby reach the effect of simulation points load, therefore, in described method of the present invention, as long as being less than the wall thickness of described plastic pipe, the degree of depth of the described breach of assurance can reach this object.Yet in order to reduce error of quality appraisement, as illustrated in fig. 1 and 2, in forming plastic pipe jaggy, the degree of depth of described breach (S1) is preferably set to 1:1.1-5, more preferably 1:1.25-3 with the ratio of the wall thickness (S2) of described plastic pipe.
In the present invention, there is no particular limitation to be formed at the shape of the breach on the outer wall of described plastic pipe, for example, can be triangular pyramid, rectangular pyramid, cylindrical, spherical or conical.Yet, to consider and form the complexity of described breach and described breach for the feasibility of the point load effect in Reality simulation situation, the shape of described breach most preferably is taper shape.When described breach is triangular pyramid, rectangular pyramid or when conical, described triangular pyramid, rectangular pyramid and conical cone point point to the inside of described plastic pipe.When described breach is taper shape, cone angle can be 30-150 °, is preferably 60-120 °.
In the present invention, the breach being formed on the outer wall of described plastic pipe can be one or more.When described breach is while being a plurality of, the number of described breach can be 2-10, is preferably 2-5.For example, and when described breach is a plurality of (3 or 4), preferably these breach are evenly distributed on same circumference.
In the present invention, there is no particular limitation in the formation position of described breach on the outer wall of described plastic pipe, and under preferable case, described breach is formed near the axial center section or center section of described plastic pipe.And the wall thickness of plastic pipe is not that in this case, described breach is preferably formed in minimum wall thickness (MINI W.) place uniformly conventionally.When described plastic pipe wall unevenness is even, the choosing method of plastic pipe sample preferably includes: on plastic pipe, find minimum wall thickness (MINI W.) region, then take this minimum wall thickness (MINI W.) region as the axial center of pipeline section, the plastic pipe of intercepting Len req, the breach that minimum wall thickness (MINI W.) place is formed is presented axially near the center section or center section of pipeline section.When described plastic pipe wall unevenness is even, the degree of depth of above-mentioned breach and the ratio of the wall thickness of plastic pipe refer to the ratio of the degree of depth of breach and the minimum wall thickness (MINI W.) of described plastic pipe.
In the present invention, the object of step (2) is in order to be full of described first liquid in plastic pipe, and prepares plastic pipe sample to be detected.In one embodiment, the detailed process of step (2) can comprise: first end socket is loaded onto in one end of plastic pipe, then in plastic pipe, inject described first liquid, in the time of cannot continuing carrying liquid in described plastic pipe, the other end of plastic pipe is loaded onto to end socket, then by the hydraulic interface on end socket, in described plastic pipe, continue to inject described first liquid, until plastic pipe is full of completely.In another embodiment, the detailed process of step (2) can comprise: first end socket is loaded onto respectively in the two ends of plastic pipe, then by the hydraulic interface on end socket, in described plastic pipe, inject described first liquid, until plastic pipe is full of completely.In above-mentioned two kinds of embodiments, two end sockets that are contained in plastic pipe two ends can be the conventional end socket using in this area, and under preferable case, one in described two end sockets is provided with hydraulic interface and vent port.In hydrostatic test process, described vent port is for the gas in discharge plastic pipe, and described hydraulic interface is for applying hydrostatic to the described first liquid in plastic pipe.
In the present invention, second liquid in first liquid in step (2) and step (3) is mainly for the ease of implementing hydrostatic test, therefore, there is no particular limitation in the concrete selection of described first liquid and described second liquid, and described first liquid and described second liquid can be water or surfactant solution separately.In the preferred case, at least one in described first liquid and described second liquid is surfactant solution.When at least one in described first liquid and described second liquid is such surfactant solution, the process of hydrostatic test can significantly be accelerated, thereby can further shorten evaluation time.More preferably, described first liquid is surfactant solution, and described second liquid is water.
Surfactant in described surfactant solution can be the surfactant that can infiltrate plastic pipe of various routines.The concrete selection of described surfactant can be depended on the material of plastic pipe to be evaluated.For the plastic pipe of various routines, described surfactant can be for example at least one in NPE, hexadecyltrimethylammonium chloride, neopelex, sodium dodecylsulphonate, cetyl trimethyl ammonium bromide and odium stearate.In a kind of more preferably embodiment, the material of described plastic pipe is tygon, and described surfactant is NPE.Described NPE can be commercially available product, and corresponding trade names can be for example Arkopal N 100.
For the concentration of described surfactant solution, in the present invention, there is no particular limitation.Because the concentration when surfactant is when too low, surfactant solution is for the DeGrain that accelerates hydrostatic test process, and after the concentration of surfactant reaches finite concentration, continue to improve concentration and can't play further improvement effect to accelerating hydrostatic test process, therefore, the concentration of described surfactant solution is preferably 0.5-10 % by weight, more preferably 1-3 % by weight.
In step (3), the concrete implementation process of described hydrostatic test can comprise: described closed container (inside accommodates described plastic pipe sample and second liquid to be detected) is heated up, the internal and external temperature for the treatment of described plastic pipe sample to be detected reach predetermined temperature and stable after, respectively the inside of described plastic pipe sample to be detected (being the space at first liquid place) and outside (being the space at second liquid place) applied respectively to hydrostatic and exhaust, after the interior pressure of described plastic pipe sample to be detected and external pressure all reach predetermined pressure, start timing, until plastic pipe destroys, record time to rupture.In the present invention, the implementation condition of described hydrostatic test can comprise: temperature is 20-100 ℃, the interior pressure of described plastic pipe sample to be detected (being also the pressure of first liquid) is 8-100bar, and the external pressure of described plastic pipe sample to be detected (being also the pressure of second liquid) is 0-10bar.In the preferred case, when the material of described plastic pipe is tygon, polypropylene or polybutylene, hydrostatic enforcement temperature is preferably 80-95 ℃; When the material of described plastic pipe is Polyvinylchloride, hydrostatic enforcement temperature is preferably 40-60 ℃.In the present invention, described hydrostatic enforcement temperature refers to internal temperature and the external temperature of described plastic pipe sample to be detected.In concrete hydrostatic test process, the internal temperature of described plastic pipe sample to be detected is identical with external temperature.
According to one embodiment of the present invention, as shown in Figure 3, the specific implementation process of the method for the point load performance of described evaluation plastic pipe can comprise: choose plastic pipe, wall thickness to this plastic pipe is measured, find out minimum wall thickness (MINI W.) region, and centered by this minimum wall thickness (MINI W.) region position, intercepting Len req plastic pipe, then, in this minimum wall thickness (MINI W.) region, form breach 3, afterwards, end socket is loaded onto in the one end that is formed with the plastic pipe of breach 3, then in plastic pipe, inject described first liquid, in the time of cannot continuing carrying liquid in described plastic pipe, the other end of plastic pipe is loaded onto to end socket, then by the hydraulic interface on end socket, in described plastic pipe, continue to inject described first liquid, until plastic pipe is full of completely, obtain plastic pipe sample 1 to be detected, afterwards, described plastic pipe sample 1 to be detected is placed in container 2, and is full of described second liquid in container 2, after treating that container 2 is full of described second liquid, by container 2 sealings, then, heat up in inside to container 2, the internal and external temperature for the treatment of described plastic pipe sample to be detected reach predetermined temperature and stable after, respectively the inside of described plastic pipe sample to be detected (being the space at first liquid place) applied interior pressure IP and carry out exhaust, the outside of described plastic pipe sample to be detected (being the space at second liquid place) applied external pressure OP and carry out exhaust, after the interior pressure IP of described plastic pipe sample to be detected and external pressure OP all reach predetermined pressure, start timing, until plastic pipe destroys, record time to rupture.
According to the method for the point load performance of described evaluation plastic pipe provided by the invention, can realize the point load performance of multiple different plastic pipe is evaluated and compared.Concrete evaluation method for example can comprise: the different plastic pipes of selecting same size; On various plastic pipes, forming respectively identical breach, is also that shape and the notch depth of breach is consistent with the ratio of wall thickness; Then in various plastic pipes, inject respectively identical liquid (for example, all injecting surfactant solution), and by plastic pipe closed at both ends, obtain assess sample; Then, each is detected to sample is placed on respectively in closed container, in each container, (for example fill respectively identical liquid, all fill water), and by container closure, then each container is adjusted to identical temperature, and identical hydrostatic to applying inside and outside the assess sample in each container, carry out hydrostatic test; Finally, record the time to rupture of each plastic pipe.Time to rupture is longer, shows that the point load performance of corresponding plastic pipe is better; Otherwise time to rupture is shorter, show that the point load performance of corresponding plastic pipe is poorer.
The invention will be further described by the following examples.
In following examples, PE80 tubing is purchased from Shandong Sheng Bang plastic cement company limited; PE100 tubing is purchased from Cangzhou Mingzhu Plastic Co., Ltd.; PE100RC tubing is purchased from Shenzhen Yada Plastic Product Co., Ltd; PVC-M tubing is purchased from Hebei Lian Su Pipe Co., Ltd..
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
Sample: PE100 tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 10.48mm, and SDR is 11, and length is 700mm;
Reagent: the Arkopal N100 surfactant solution of 2 % by weight, purchased from Sigma-Aldrich company.
Evaluation procedure:
(1) PE100 tubing is placed 24 hours at ambient temperature, the auger bit that is then 12mm with 90 ° of cone angles, external diameter is in the punching of minimum wall thickness (MINI W.) place, and the formation degree of depth is that 5.24mm, cone angle are the conical breach of 90 °, then places 24 hours.
(2) end socket is loaded onto in the one end that forms tubing jaggy, inject Arkopal N 100 surfactant solutions of 2 % by weight, then at the other end of this tubing, load onto end socket (thering is a hydraulic interface and an exhausr port on this end socket).Then by vent port, continue to add described surfactant solution, until fill up whole tubing.
(3) tubular product sample that installs end socket is put into container, and be full of deionized water in container, then by container closure.Then, start heating arrangement, the temperature in container is increased to 80 ℃, when the temperature in tubular product sample and the temperature of deionized water all reach 80 ℃, at this temperature, place 3 hours.
(4) then, the part of the deionized water in the tubular product sample in container and in container (being also outside tubular product sample) primer fluid is compressed into row pressurization respectively, and the pressure in tubular product sample is adjusted to 15.2bar, and the pressure outside tubular product sample is adjusted to 4.0bar.When pressure reaches setting value, start timing.
As a result, tubular product sample destroyed after 278 hours.By observing, can find out, at the tapered indentations place of tubular product sample, have crackle, tubular product sample generation brittle rupture.
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is, in (3) step, to the Arkopal N100 surfactant solution that is also full of 2 % by weight in container.
As a result, tubular product sample destroyed after 206 hours.
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is, in (4) step, the pressure in tubular product sample is adjusted to 17.8bar, and the pressure outside tubular product sample is adjusted to 6.0bar.
As a result, tubular product sample destroyed after 217 hours.
Embodiment 4
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is, in (2) step, in tubing, to inject deionized water.
As a result, tubular product sample destroyed after 950 hours.
Embodiment 5
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation plastic pipe of embodiment 1, difference is that, in step (1), the plastic pipe of selecting is PE80 tubing (tubing specification is identical with the PE100 tubing in embodiment 1); In (4) step, the pressure in tubular product sample is adjusted to 13.9bar, the pressure outside tubular product sample is adjusted to 4.0bar.
As a result, tubular product sample destroyed after 67 hours.
Embodiment 6
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE80 tubing of embodiment 5, difference is, in (3) step, the temperature in container to be increased to 95 ℃; In (4) step, the pressure in tubular product sample is adjusted to 11.6bar.
As a result, tubular product sample destroyed after 281 hours.
Embodiment 7
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is, in (3) step, the temperature in container to be increased to 95 ℃.
As a result, tubular product sample destroyed after 18 hours.
Embodiment 8
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is, in (3) step, the temperature in container to be increased to 95 ℃; In (4) step, the pressure in tubular product sample is adjusted to 12.7bar.
As a result, tubular product sample destroyed after 110 hours.
Embodiment 9
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is that, in (1) step, the notch depth forming on tubular product sample is 8.38mm.
As a result, tubular product sample destroyed after 46 hours.
Embodiment 10
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the point load performance of the method evaluation PE100 tubing of embodiment 1, difference is that, in (1) step, the notch depth forming on tubular product sample is 3.49mm.
As a result, tubular product sample destroyed after 683 hours.
Embodiment 11
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
Sample: PVC-M tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 5.36mm, and SDR is 21, and length is 700mm.
Evaluation procedure:
(1) PVC-M tubing is placed 24 hours at ambient temperature, the auger bit that is then 12mm with 90 ° of cone angles, external diameter is in the punching of minimum wall thickness (MINI W.) place, and the formation degree of depth is that 2.68mm, cone angle are the conical breach of 90 °, then carries out status adjustment 24 hours.
(2) end socket is loaded onto in the one end that forms tubing jaggy, inject deionized water, then at the other end of this tubing, load onto end socket (thering is a hydraulic interface and an exhausr port on this end socket).Then by vent port, continue to add deionized water, until fill up whole tubing.
(3) tubular product sample that installs end socket is put into container, and be full of deionized water in container, then by container closure.Then, start heating arrangement, the temperature in container is increased to 60 ℃, when the temperature in tubular product sample and the temperature of deionized water all reach 60 ℃, at this temperature, carry out status adjustment 3 hours.
(4) part of the deionized water in the tubular product sample in container and in container (being also outside tubular product sample) is introduced hydrostatic line respectively, and primer fluid is compressed into row pressurization, pressure in tubular product sample is adjusted to 33.3bar, the pressure outside tubular product sample is adjusted to 4.0bar.When pressure reaches setting value, start timing.
As a result, tubular product sample is destroyed after 372 hours.
Embodiment 12
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
Tubular product sample 1:PE80 tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 10.36mm, and SDR is 11, and length is 700mm;
Tubular product sample 2:PE100 tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 10.48mm, and SDR is 11, and length is 700mm;
Tubular product sample 3:PE100 RC tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 10.42mm, and SDR is 11, and length is 700mm.
According to the method for embodiment 1, respectively tubular product sample 1, tubular product sample 2 and tubular product sample 3 are tested, wherein, producing conical notch depth is 1:2 with the ratio of minimum wall thickness (MINI W.).
As a result, tubular product sample 1 destroyed after 67 hours; Tubular product sample 2 destroyed after 285 hours; Tubular product sample 3 destroyed after 697 hours.Tubular product sample 1(A can be described by this testing result), tubular product sample 2(B), tubular product sample 3(C) point load performance by the good order to differing from, be: C>B>A.
In fact, PE80 tubing is unimodal distribution polyvinyl piping materials, PE100 tubing is the bimodal distribution polyvinyl piping materials developing on the basis of PE80 tubing, PE100RC tubing is the bimodal distribution polyvinyl piping materials of latest generation, therefore, PE100RC tubing, the relation of the resistibility of slow crack growth performance between PE100 tubing and PE80 tubing three is that PE100RC tubing is optimum, PE80 tubing is the poorest, and, the point load performance of plastic pipe and resistibility of slow crack growth performance correlation, therefore, PE100RC tubing, the relation of the point load performance between PE100 tubing and PE80 tubing three should be also that PE100RC tubing is optimum, PE80 tubing is the poorest.This with according to the result of described method evaluation of the present invention, be consistent.Visible, method according to the present invention is correct, reliable to the result of the point load performance of plastic pipe evaluation.
Embodiment 13
The present embodiment is for illustrating the method for the point load performance of described evaluation plastic pipe provided by the invention.
According to the method for embodiment 1, PE100 tubing is repeated to point load Performance Evaluation again 5 times, difference is that, in (1) step, the cone angle of the conical breach of producing is 120 °, in (4) step, the pressure in tubular product sample is adjusted to 13.9bar.
The time to rupture that records respectively PE100 tubing, result is as shown in table 1 below.
Comparative example 1
Sample: PE100 tubing, external diameter is 110mm, and minimum wall thickness (MINI W.) is 10.48mm, and SDR is 11, and length is 700mm;
Reagent: the Arkopal N100 surfactant solution of 2 % by weight, purchased from Sigma-Aldrich company.
According to the point load testing method of Hessel, the steel ball that is 10mm by diameter is pressed into the outer wall of PE100 tubing, compression distance is 5mm, then in 80 ℃, concentration are the environment of Arkopal N100 surfactant solution of 2 % by weight, this PE100 tubing is tested under the condition of 4MPa ring stress.Record the time that tubular product sample destroys.And this evaluation procedure is repeated 5 times, record each result, as shown in table 1 below.
Table 1
By the result of embodiment 13 and comparative example 1 is compared and can be found out, the ring stress that in embodiment 13, in the suffered ring stress of tubular product sample and comparative example 1, tubing is subject to is suitable, but, in acetonideexample 13, the time to rupture of tubular product sample is only about 380 hours, and the time to rupture of tubular product sample reached about 4200 hours in comparative example 1, visible, the method for the point load performance of evaluation plastic pipe according to the present invention has significantly shortened evaluation time.
And, according to the fluctuation ratio of the testing result of the time to rupture of calculating formula ((maximal value-minimum value)/mean value) calculating tubular product sample, result, in embodiment 13, the fluctuation ratio of five testing results is 10.20%, in comparative example 1, the fluctuation ratio of five testing results is 63.07%, visible, the dispersiveness of the evaluation result that the method for the point load performance of evaluation plastic pipe according to the present invention obtains is less.
Claims (11)
1. a method of evaluating the point load performance of plastic pipe, the method comprises the following steps:
(1) on the outer wall of plastic pipe, form breach, the degree of depth of described breach is less than the wall thickness of described plastic pipe;
(2) in forming plastic pipe jaggy, be full of first liquid, and by the closed at both ends of plastic pipe, obtain plastic pipe sample to be detected;
(3) described plastic pipe sample to be detected is placed in closed container, and is full of second liquid in described closed container, then by described closed container closure, and carry out hydrostatic test.
2. method according to claim 1, wherein, in step (1), the external diameter of described plastic pipe is 4-40:1 with the ratio of wall thickness, is preferably 5-20:1.
3. method according to claim 1, wherein, in step (1), the length-diameter ratio of described plastic pipe is 3-20:1, is preferably 5-10:1.
4. method according to claim 1, wherein, in step (1), the material of described plastic pipe is tygon, polypropylene, polybutylene or Polyvinylchloride.
5. according to the method described in any one in claim 1-4, wherein, in step (1), the degree of depth of described breach is 1:1.1-5 with the ratio of the wall thickness of described plastic pipe, is preferably 1:1.25-3.
6. according to the method described in any one in claim 1-4, wherein, in step (1), described breach be shaped as triangular pyramid, rectangular pyramid, cylindrical, spherical or conical.
7. method according to claim 1, wherein, at least one in described first liquid and described second liquid is surfactant solution.
8. method according to claim 7, wherein, described first liquid is surfactant solution, described second liquid is water.
9. according to the method described in claim 7 or 8, wherein, the concentration of described surfactant solution is 0.5-10 % by weight, is preferably 1-3 % by weight.
10. according to the method described in claim 7 or 8, wherein, the surfactant in described surfactant solution is at least one in NPE, hexadecyltrimethylammonium chloride, neopelex, sodium dodecylsulphonate, cetyl trimethyl ammonium bromide and odium stearate.
11. methods according to claim 1, wherein, in step (3), the condition of described hydrostatic test comprises: temperature is 20-100 ℃, the interior pressure of described plastic pipe sample to be detected is 8-100bar, and the external pressure of described plastic pipe sample to be detected is 0-10bar.
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| CN (1) | CN103575595B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524591A (en) * | 2014-10-24 | 2016-04-27 | 中国石油化工股份有限公司 | Solution for test on environmental stress resistance of hollow container and use thereof |
| WO2019136791A1 (en) * | 2018-01-09 | 2019-07-18 | 广州特种承压设备检测研究院 | Method for rapidly evaluating slow crack growth resistance of plastic pipe |
| CN111504796A (en) * | 2020-04-29 | 2020-08-07 | 李俊 | Local compressive property detection device for pressure vessel |
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| GB1531557A (en) * | 1977-06-24 | 1978-11-08 | Chloride Silent Power Ltd | Proof-testing of the strength of tubes of sintered ceramic material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524591A (en) * | 2014-10-24 | 2016-04-27 | 中国石油化工股份有限公司 | Solution for test on environmental stress resistance of hollow container and use thereof |
| CN105524591B (en) * | 2014-10-24 | 2018-06-12 | 中国石油化工股份有限公司 | A kind of hollow container resisting environmental stress and cracking test solution and its application |
| WO2019136791A1 (en) * | 2018-01-09 | 2019-07-18 | 广州特种承压设备检测研究院 | Method for rapidly evaluating slow crack growth resistance of plastic pipe |
| CN111504796A (en) * | 2020-04-29 | 2020-08-07 | 李俊 | Local compressive property detection device for pressure vessel |
| CN111504796B (en) * | 2020-04-29 | 2023-03-17 | 李俊 | Local compressive property detection device for pressure vessel |
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| CN103575595B (en) | 2016-04-27 |
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