Proof Test Criteria for Thin Walled Pressure Vessels

1979 ◽  
pp. 83-110
Author(s):  
R. W. Finger
Keyword(s):  
Pressure Vessels ◽  
Test Criteria ◽  
Thin Walled

Thin-Walled Pressure Vessels

2016 ◽  
pp. 77-81 ◽  
Author(s):  
Carl T. Herakovich
Keyword(s):  
Pressure Vessels ◽  
Thin Walled

Ray Based Model for the Ultrasonic Time-of-Flight Diffraction Simulation of Thin Walled Structure Inspection

2005 ◽  
Vol 127 (3) ◽  
pp. 262-268 ◽  
Author(s):  
G. Baskaran ◽  
K. Balasubramaniam ◽  
C. V. Krishnamurthy ◽  
C. Lakshmana Rao
Keyword(s):  
Time Of Flight ◽  
Diffraction Theory ◽  
Pressure Vessels ◽  
Experimental Results ◽  
Signal Identification ◽  
Time Of Flight Diffraction ◽  
Aerospace Applications ◽  
Ultrasonic Time ◽  
Probe Frequency ◽  
Thin Walled

It is necessary to size the cracklike defects accurately in order to extend the life of thin-walled (<10mm) components (such as pressure vessels) particularly for aerospace applications. This paper discusses the successful application of ray techniques to simulate the ultrasonic time-of-flight diffraction experiments for platelike structures. For the simulation, the diffraction coefficients are computed using the geometric diffraction theory. The A and B scans are simulated in near real time and the different experimental parameters can be interactively controlled due to the computational efficiency of the ray technique. The simulated results are applied to (1) defect signal identification for vertical defects, (2) inspection of inclined defects, and (3) study the effect of pulse width or probe frequency on experimental results. The simulated results are compared with laboratory scale experimental results.

Issues in Manufacture and Qualification of Specialty Brazed Joints for Nuclear Applications

2016 ◽  
Vol 1138 ◽  
pp. 37-42 ◽  
Author(s):  
Calin Truta ◽  
Marin Ciocanescu ◽  
Adrian Amzoi
Keyword(s):  
Base Material ◽  
Pressure Vessels ◽  
The Body ◽  
National Standards ◽  
French Experience ◽  
Asme Code ◽  
Material Erosion ◽  
Brazed Joints ◽  
Thin Walled ◽  
French Design

Nuclear experimental instrumentation frequently includes the usage of thin-walled (metallic sheathed) thermocouples passing through the boundaries of pressure vessels. This is accomplished by sealing the thermocouples by brazing through special design fittings (passages) which are later sealed / welded to the body of the vessel.Two are the challenges to face : (a) the manufacture of the instrumented passage (b) its mandatory qualification, according to relevant standards. Even the brazing qualification standards are more flexible than for welding, the peculiar situation of nuclear instrumentation still needs special consideration and it is not properly covered by the regular standards.The paper describes the experience of the authors in manufacture of the instrumented passages with steel or Inconel sheathed thermocouples, along with some other known projects, in conjunction with applicability of relevant standards: ASME code, AWS standards, national standards. Since it is about pressure vessels, ASME prescriptions are mandatory in Romania; other standards may serve as valuable sources for the “engineering judgment” allowed and recommended by ASME code.The main problem in such specialty brazing qualification is that for some combinations of base metals and filler (imposed by application), one cannot avoid the significant fragilization due to a tremendous increase of hardness in the brazing area. Base material erosion is added and the effect is catastrophic : sectioning the thermocouples at the slightest movement. For example, brazing Inconel thin-walled tubes with BNi-7 is very hard to control – experimental data and images are included in the paper to illustrate this.Therefore, special means must be applied both in fabrication and in qualification, in order to ensure the product is functional and safe, even being fragile. This approach can be found in French design of irradiation devices, being also considered in the French code for design and construction of experimental reactors and irradiation devices. Being known that French experience in this field is vast, their approach makes us confident that our brazing technique is not wrong but the problem is to be solved through ‘smart’ design and specific procedures. Consequently a tentative set of domestic rules for work and qualification is proposed for discussion and further improvement.

An investigation of the influence of production method on the cyclic strength of welded assemblies of thin-walled connections of atomic power station pressure vessels

1991 ◽  
Vol 23 (3) ◽  
pp. 342-350 ◽  
Author(s):  
A. G. Mazepa ◽  
A. B. Borintsev ◽  
L. A. Yudin ◽  
A. G. Kazantsev ◽  
L. K. Shteintsaig ◽  
...  
Keyword(s):  
Production Method ◽  
Cyclic Strength ◽  
Pressure Vessels ◽  
Atomic Power Station ◽  
Power Station ◽  
Thin Walled
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