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Monday, August 3, 2020 | History

2 edition of Plating end fittings to reduce hydrogen ingress at rolled joints in CANDU reactors found in the catalog.

Plating end fittings to reduce hydrogen ingress at rolled joints in CANDU reactors

Plating end fittings to reduce hydrogen ingress at rolled joints in CANDU reactors

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Published by Fuel Channel Components Branch, Chalk River Laboratories in Chalk River, Ont .
Written in English

    Subjects:
  • Nuclear fuel claddings,
  • Joints (Engineering)

  • Edition Notes

    Other titlesRevêtement des raccords d"extrémité pour la réducation de l"entrée d"hydrogène dans les joints dudgeonnés entre les tubes de force et tuyaux des réacteurs CANDU.
    StatementA.J. White ... [et al.].
    SeriesAECL research -- 10965, AECL research (Series) -- 10965
    ContributionsWhite, A. J., International Conference on Expanded and Rolled Joint Technology (1993 : Toronto, Ont.)
    Classifications
    LC ClassificationsTK9207.5 .P53 1993
    The Physical Object
    Pagination[4], 9 p. :
    ID Numbers
    Open LibraryOL17378824M
    ISBN 10066015384X

    while hydrogen attack mainly occurs at elevated temperatures this step will reduce, if not eliminate, that possibility entirely. The weak point in an all welded system will be the flange joint. In order to provide a high degree of integrity at flanged joints a gasket that consists of . Post-plating baking: Baking the part immediately after plating can reverse the effects of hydrogen embrittlement in most cases. General guidelines call for baking the part for four hours at a temperature of º F within one hour of plating. Most steels typically require a lower .

    Plating on plastics can be achieved with various metals. Copper is the obvious choice when there is a need to enhance the electrical conductivity of the substrate. Gold or silver plating plastic can also be used to add aesthetic appeal to a plastic product. Nickel plating on plastic is also a widely implemented metal finishing industry practice. ASME B Process Piping Code is available for purchase online.. CGA G - Standard for Hydrogen Piping Systems at Consumer Locations. G, ANSI/AIAA Guide to Safety of Hydrogen and Hydrogen Systems, can be purchased from . N Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable and Stationary Containers, .

    We highlight connections, attachment styles and the 5 most important factors you need to consider for hydraulic fittings. 7 common end connection types. JIC 37⁰ Flares: The Joint Industrial Conference (JIC) fitting is the most common hydraulic connection style. It consists of parallel threads and a 37⁰ cone on the fitting end that attaches. Standards for Hydrogen Embrittlement Relief after Zinc Plating. An ongoing discussion from through Q. I am a small metal stamping job shop. We sent some steel parts (SAE) to our heat treater and plater (zinc & bake). The parts failed in service. Our customer is claiming our plater didn't bake them right.


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Plating end fittings to reduce hydrogen ingress at rolled joints in CANDU reactors Download PDF EPUB FB2

Pg 2 PRESSURE TUBE TO END FITTING ROLLED JOINTS • Rolled joints are joints between a tube and a hub that are made by cold- working the end of the tube into the hub to produce compressive residual stresses for sealing.

• Such joints are used extensively in CANDU reactors as they are a practical way to join dissimilar metals, eg, zirconium alloys and steels. Get this from a library. Plating end fittings to reduce hydrogen ingress at rolled joints in CANDU reactors.

[A J White; Chalk River Nuclear Laboratories. Fuel Channel Components Branch.]. Plating end-fittings to reduce hydrogen ingress at rolled joints in CANDU reactors, International conference on rolled joint technology, CNS, Toronto () Google Scholar Yetisir et Cited by: 3.

Plating End Fittings to Reduce Hydrogen Ingress at Rolled Joints in CANDU Reactors A.J. White, V.F Urbanic, A.A. Bahurmuz, W.R. Clendenning, R. Joynes, G.M. McDougall, B.C. Skinner, S. Venkatapathi (AECL) The Residual Stresses in and the Stress Corrosion Performance of Roller Expansion Transitions in Alloy Steam Generator Tubing.

the reduction of the hydrogen ingress rate by lowering the corrosion rate and by Cr-plating in the rolled-joint between the end fitting and pressure tube, 2. the process of hydrogen ejection using the Pd-plating and the addition of oxygen in the annulus gas system, 3.

the modification of texture from circumferential to radial by: R.L. Tapping, in Nuclear Corrosion Science and Engineering, Summary of deuterium ingress at rolled joints. Additional deuterium ingress occurs at the pressure tube ends as a result of the galvanic contact between the zirconium alloy pressure tube and the stainless steel end fitting.

A mathematical model exists for predicting deuterium buildup in the rolled joint region of pressure tubes. In KAPS-2 and onwards, the pressure tube material was changed to Zr% Nb alloy, which is a high strength material and also has low pick-up rate of hydrogen. Zero clearance rolled joints between the pressure tube and the end fitting have been introduced to keep residual stresses to lower levels and prevent failure due to delayed hydride.

In addition, examination of pressure tubes removed from reactors has also contributed useful information on deuterium ingress at the rolled joint. The results have shown that rolled joint ingress depends on a number of factors including: • characteristics of the crevice between the pressure tube and end fitting, • water chemistry in the.

Joints (Engineering) 57 Building, Iron And Steel 7 Welding 7 Adhesives 6 Fasteners 5 + More; Call Number. T - Technology. 49 R - Medicine 1 Format. Books 56 Journals, Magazines, Newspapers 1 Publication Year. 33 to Present.

Calandria Tubes (CT) and CT Rolled Joints ›Address GAI – 95G02 and CSI –AA07 related to pressure tube failure with consequential loss of moderator followed by end fitting ejection • Seamless calandria tube (CT) with thickened ends and improved rolled joints (RJ) are expected to survive pressure tube rupture to help mitigate core damage.

Hydrogen embrittlement is a phenomenon that affects high-strength steel. Hydrogen--often from pickling or plating--invades the grain structure of a high strength steel, making it brittle and subject to catastrophic failure.

The best approach is to avoid or minimize processes that cause hydrogen. At each end, the tube is connected to a stainless steel end fitting by a rolled joint. A thin Zircaloy tube surrounds the pressure tube and the annular space between the tubes contains an inert.

At each end, the tube is connected to a stainless steel end fitting by a rolled joint. A thin Zircaloy tube surrounds the pressure tube and the annular space between the tubes contains an inert gas.

All fittings must be suitable for hydrogen service and for the specific operating conditions. Welding is usually preferred for joints in hydrogen piping systems since welding provides a better connection and reduces the potential for leaks compared to mechanical fittings.

The pressure tube is a major component of the CANDU reactor, which supports nuclear fuel bundle. In order to complete the integrity evaluation of pressure tube, expert knowledge, iterative.

A surve y of the p erformance eof CANDU reactors s uggest that the m easured axial DHC velocities are within 95 % confidence int ervals for col d worked Zr % Nb materi al. The criti cal stress. The hydrogen is available from the water in aqueous plating bath chemistries and is also exposed at the surface of the work piece during the acid pickling steps of the pretreatment process.

Because the hydrogen atom is much smaller in size than the metal of the deposit, it is able to migrate into the crystal lattice of the basis metal, and. Hydrogen is widely employed for hydrogenation and other purposes in chemicals manufacture, petroleum refining and other chemical process industries (Hydrogen: The Real Action Is Today, CE, February, pp.

28ff), and it holds promise as a fuel. Nipple Fittings – Nipples are short sections of pipe that are male-threaded at each end and used for connecting two female-threaded pipe ends or fittings.

Connection Methods Pipe joints can be secured in a number of ways, depending on the material, features and functions of the pipes and the fittings.

Using a pen end, shoelace tip, hoodie string tip or anything small and blunt enough to push the weed closer together to fill in any gaps in the roll. Don’t pack down too much or. Piping, tubing, fittings, valves, accessory equipment, gaskets, and thread sealants shall be suitable for hydrogen service at the pressures and temperatures encountered and shall maintain their integrity under elevated temperatures during fire conditions (see ).

Selection of piping joints .Mixed Steel and Stainless Steel Assembly Triples the Plating Cost. A manufacturer of food packaging machinery attempted to lower costs on one of their larger weldments, by welding stainless steel plates to a cold-rolled steel tube.

The assembly was sent out for electroless nickel plating to protect the steel tube from corrosion during use. What an Engineer or Designer Should Consider Before Electroplating. Nesting of parts during the electroplating process. Since electroplating involves both an electrical and a chemical reaction at the surface of the part, exposure to the plating chemistry is critical to the overall performance of the finished product.

Nesting of parts will result in a lack of adhesion or coverage on the surface.