On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter

Although rotary shaft garter spring seals are widely used throughout industry, very little is known about the sealing mechanism of the lip-shaft interface. It is now generally accepted that some sort of fluid film separates the lip and the shaft. Previous workers have also postulated a relationship between the coefficient of friction and a non-dimensional hydrodynamic parameter, as in standard lubrication theory. This present paper clarifies this relationship, and shows that seals can also operate over the mixed friction, as well as the full film lubrication region. The results were obtained by accurate knowledge of the operating temperature under the sealing lip. Two types of surface thermocouple were developed to do this and these are described in full.

Download Full-text

Design and servo control of a leak tightness machine working based on hydrostatic pressure aging method

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1177/0959651816658813 ◽

2016 ◽

Vol 230 (9) ◽

pp. 932-942 ◽

Cited By ~ 2

Author(s):

Barış Can Yalçın ◽

Zakir Torun ◽

Muhammet Balcilar ◽

Ahmet Koyun

Keyword(s):

Hydrostatic Pressure ◽

Servo Control ◽

Leak Tightness

Download Full-text

A Review of a Radioactive Material Shipping Container Including Design, Testing, Upgrading Compliance Program and Shipping Logistics

Transportation, Storage, and Disposal of Radioactive Materials ◽

10.1115/pvp2003-2134 ◽

2003 ◽

Author(s):

Andrew Celovsky ◽

Randy Lesco ◽

Brian Gale ◽

Jeffrey Sypes

Keyword(s):

Radioactive Material ◽

Type B ◽

Design Elements ◽

Shipping Container ◽

Global Transport ◽

Leak Tightness ◽

Design Requirements ◽

Compliance Program ◽

Integrity Tests ◽

Key Aspects

Ten years ago Atomic Energy of Canada developed a Type B(U)-85 shipping container for the global transport of highly radioactive materials. This paper reviews the development of the container, including a summary of the design requirements, a review of the selected materials and key design elements, and the results of the major qualification tests (drop testing, fire test, leak tightness testing, and shielding integrity tests). As a result of the testing, improvements to the structural, thermal and containment design were made. Such improvements, and reasons thereof, are noted. Also provided is a summary of the additional analysis work required to upgrade the package from a Type B(U) to a Type B(F), i.e. essentially upgrading the container to include fissile radioisotopes to the authorized radioactive contents list. Having a certified shipping container is only one aspect governing the global shipments of radioactive material. By necessity the shipment of radioactive material is a highly regulated environment. This paper also explores the experiences with other key aspects of radioactive shipments, including the service procedures used to maintain the container certification, the associated compliance program for radioactive material shipments, and the shipping logistics involved in the transport.

Download Full-text

Radial Shaft Seals in Arctic Conditions

10.4271/940099 ◽

1994 ◽

Cited By ~ 1

Author(s):

Jaakko Välttilä

Keyword(s):

Arctic Conditions ◽

Shaft Seals

Download Full-text

Leak tightness of magnetic pulse crimped joints

International Journal Sustainable Construction & Design ◽

10.21825/scad.v3i3.20580 ◽

2012 ◽

Vol 3 (3) ◽

pp. 243-250

Author(s):

A. Loosveld ◽

W. De Waele ◽

K. Faes ◽

O. Zaitov

Keyword(s):

Stainless Steel ◽

Steel Tube ◽

Test Series ◽

Stainless Steel Tube ◽

Magnetic Pulse ◽

Test Procedures ◽

Burst Test ◽

Master Thesis ◽

Leak Tightness ◽

Sealing Materials

The goal of this master thesis is to realize and investigate leak tightness of joints produced by theelectromagnetic pulse (EMP) crimping process. This way of joining metals has gained more attention lately.With EMP welding, leak tight joints can already be achieved. However, the crimping process has somemajor advantages over EMP welding like the fact that more material combinations are possible and itrequires less energy. To realize the leak tightness, two kinds of sealing materials are used: O-rings andadhesives. The workpieces consist of an aluminium or stainless steel tube which is crimped on a solidaluminium mandrel with circumferential grooves in it. First, some preliminary tests are performed todetermine how much the tubes deform in the grooves. This deformation mainly depends on the appliedcharging voltage and the geometry of the groove. With this information, it is possible to estimate the amountof compression an O-ring would undergo when placed inside this groove. On other workpieces, adhesiveswill be applied. Several test procedures can be conducted on the parts to investigate leak tightness. Theresults of a helium test and a pressure burst test on the first test series conducted at the Walloon researchcentre CEWAC already showed that the use of O-rings can be effective.

Download Full-text

Integrierte Berechnung des dynamischen Betriebsverhaltens von Radialwellendichtringen/Integrated Calculation of the Dynamic Operation Behavior of Radial Shaft Seals

Konstruktion ◽

10.37544/0720-5953-2015-11-12-80 ◽

2015 ◽

Vol 67 (11-12) ◽

pp. 80-84

Author(s):

Barbara Jennewein ◽

Bernd Sauer

Keyword(s):

Dynamic Operation ◽

Shaft Seals

Inhalt: Das instationäre Betriebsverhalten eines Radialwellen-dichtrings (RWDR) über der Einsatzzeit kann erstmals berechnet werden. Ermöglicht wird dies durch einen integrierten Berechnungsansatz, der die Wechselwirkungen von den Elastomereigenschaften, von Reibungs-, Verschleiß- sowie Temperaturverhalten und von dynamischer Wellenauslenkung in radialer Richtung berücksichtigt. Im Rahmen der Forschungsarbeit wurde eine Strategie zur experimentellen Ermittlung der Eingangsparameter aufgezeigt und für eine exemplarische Reibpaarung aus RWDR, Schmierstoff und Gegenlauffläche durchgeführt. Anhand einer experimentellen Validierung wurde gezeigt, dass die Berechnung gut die Ergebnisse aus Prüfstandsversuchen trifft.

Download Full-text