A kind of hydrogen induced cracking (HIC) test chamber
The utility model relates to a kind of hydrogen induced cracking (HIC) test chamber for hydrogen sulfide corrosion test.
Due to the severe situation of whole world oil supply, make some harsh corrosive environment oil gas fields in succession drop into exploitation, these acid-soluble oil gas fields are contained water and H2S conventionally.In sour environment, H2S is a kind of strong hydrogen medium that oozes, and usually causes hydrogen induced cracking (HIC), and often there is no obvious sign in advance, usually causes catastrophic failure.Therefore, for acid medium, pipe line steel, pressure vessel steel etc. must carry out hydrogen sulfide corrosion test.According to country's " pipe line steel and pressure vessel steel resistance against hydrogen cracking assessment method " standard-required, test is carried out in closed container, container should have enough volumes to place test sample, and have inflation and import the import and export pipeline of hydrogen sulfide gas, the material relating in experimental rig should test for contamination environment or is reacted with experimental enviroment.For meeting testing standard requirement, people have made lucite test chamber.The test chamber adopting now, cover plate is detachable, adopts sealing ring sealing, complex operation, and easily produce hydrogen sulfide gas leakage; Import and export pipeline and adopt flexible pipe, easily touch sample.
Summary of the invention
The purpose of this utility model is to overcome prior art defect, and a kind of hydrogen induced cracking (HIC) test chamber of easy and simple to handle, good airproof performance is provided.
The technical solution of the utility model is achieved in that a kind of hydrogen induced cracking (HIC) test chamber, it is the closed container that a top is provided with screw thread bottleneck, by screw cap by rubber stopper press seal screw thread bottleneck, air inlet pipe, escape pipe, catheter are communicated with closed container through rubber stopper, and sample is placed on the specimen mounting in closed container by screw thread bottleneck before test.
Preferably, catheter and air inlet pipe are the hard tube of lucite material, directly pass into closed container bottom, avoid touching sample.
Preferably, closed container is by bonding the forming of circular cover, base plate and cylinder of transparent organic glass material, and cover plate and base plate circumferential edges have " L " shape step, and cylinder upper and lower side props up respectively " L " shape step the adhering and sealing of cover plate and base plate circumferential edges.
Preferably, rubber stopper bottom surface and be coated with silica gel layer above.
The utility model adopts transparent organic glass material, facilitates the observation of process of the test; Threaded cap can compress rubber stopper after tightening, easy to operate, after rubber stopper shrinks, with three lucite tube close contacts, can effectively stop hydrogen sulfide gas leakage; Base plate, cover plate and cylinder adopt " L " shape bonding, good sealing effect; Air inlet pipe, catheter are lucite hard tube, fix at closed container interior location, avoid touching sample.
Brief description of the drawings
Fig. 1 is the utility model front view.
Fig. 2 is the utility model side view.
Fig. 3 is the utility model top view.
In figure, 1-base plate; 2-sample; 3-specimen mounting; 4-cylinder; 5-cover plate; 6-screw cap; 7-air inlet pipe; 8-catheter, 9-rubber stopper; 10-escape pipe; 11-screw thread bottleneck.
Detailed description of the invention
Be further described below in conjunction with accompanying drawing:
As Fig. 1, Fig. 2, shown in Fig. 3, a kind of hydrogen induced cracking (HIC) test chamber, it is the closed container that a top is provided with screw thread bottleneck 11, by screw cap 6 by rubber stopper 9 press seal screw thread bottlenecks 11, air inlet pipe 7, escape pipe 10, catheter 8 is communicated with closed container through screw cap 6 upper face center circular holes and rubber stopper 9, sample 2 is placed on the specimen mounting 3 in closed container by screw thread bottleneck 11 before test, catheter 8 and air inlet pipe 7 are the hard tube of lucite material, directly pass into closed container bottom, avoid touching sample, closed container is by the circular cover 5 of transparent organic glass material, base plate 1 and cylinder 4 is bonding forms, cover plate 5 and base plate 1 circumferential edges have " L " shape step, cylinder 4 upper and lower sides prop up respectively " L " shape step the adhering and sealing of cover plate 5 and base plate 1 circumferential edges, rubber stopper 9 bottom surfaces and be coated with silica gel layer above, to strengthen sealing effectiveness.
Hydrogen induced cracking (HIC) when test, by air inlet pipe 7, catheter 8, escape pipe 10 through rubber stopper 9, and rubber stopper 9 bottom surfaces and above coating silicon rubber, the gap that sealing may exist.Air inlet pipe 7 connects H2S gas cylinder and N2 bottle, and catheter 8 connects constant flow pump, and escape pipe 10 connects tail gas absorber.When test, the sample 2 after cleaning is placed on specimen mounting 3, ensures wide uprightly.Rubber stopper 9 clogs screw thread bottleneck 11, threaded together bottle cap 6.Import testing liquid by catheter 8, liquid level covers sample 2, sealing catheter 8.Open N2 gas cylinder, N2 enters by air inlet pipe 7, and O2 discharges by escape pipe 10, and testing liquid deoxygenation was closed to N2 after 2 hours.Open H2S gas cylinder, H2S gas enters by air inlet pipe 7, is dissolved in testing liquid, and the H2S gas not dissolving is in time discharged by escape pipe 10.After 96 hours, off-test, stops H2S and imports, and imports N2 and removes the H2S in test chamber, derives testing liquid by catheter 8, turns on screw cap 6, opens rubber stopper 9, takes out sample 2.