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Saturday, July 25, 2020 | History

1 edition of Strength characteristics and air leakage determinations for alternative mine seal designs found in the catalog.

Strength characteristics and air leakage determinations for alternative mine seal designs

Strength characteristics and air leakage determinations for alternative mine seal designs

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  • 29 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Washington, D.C .
Written in English

    Subjects:
  • Concrete stoppings (Mining) -- Airtightness -- Testing.,
  • Cement composites -- Testing.,
  • Foamed materials -- Testing.,
  • Wood -- Testing.,
  • Strength of materials.,
  • Coal mines and mining.

  • Edition Notes

    Includes bibliographical references (p. 21).

    Statementby E.S. Weiss ... [et al.].
    SeriesReport of investigations ;, 9477, Report of investigations (United States. Bureau of Mines) ;, 9477.
    ContributionsWeiss, E. S.
    Classifications
    LC ClassificationsTN23 .U43 no. 9477, TN304 .U43 no. 9477
    The Physical Object
    Pagination21 p. :
    Number of Pages21
    ID Numbers
    Open LibraryOL1415919M
    LC Control Number93025429

    Leakage is probably more a result of the seal design rather than a property of the material but good face materials can certainly promote low leakage seal designs. In most seals, the actual face separation is strongly related to the surface finish of the materials.   Leakage rate: The leakage rate of a mechanical shaft seal depends of a number of factors such as: Surface roughness of seal faces Flatness of seal faces Vibration and stability of pump Speed of rotation Temperature, Viscosity and Type of pumped medium Pump pressure Seal and pump assembly.. 23/08/ PEM 3 Knowledge sharing Presentation.

    envelope can damage the seal and result in greater leakage rates. Other system factors that affect seal leakage rates, besides condition of the seal parts, include pump operation at off-design conditions, pipe strain, bearing problems, fitting leaks at the seal gland (often mistaken as seal leakage), impeller or sleeve gasket damage, etc.   The simulations aimed to model the results of leakage in traps of varying shape and seal leakiness, in the presence of active charge equivalent to a typical Central North sea drainage area of 50 km2, over a 60 million year period. Sealing processes and top seal assessment Fig. 2. Key seal and leak mechanisms pertaining to top seal integrity.

    faces with different seal chambers and stuffing boxes (2). The operating conditions (speed, pressure, test fluid) and seal design were constant over the tests. The results showed that seal chambers had significant decreases in the tempera-tures around the seal and at the seal faces when compared to a standard stuffing box (Figure 1). Chapter 4 Air Leakage Sealing – Materials and Techniques 57 Some building scientists use a different criterion — the air leakage rate per square foot of exterior envelope (CFM50/). The goal is often CFM50/ or less. An expert blower door technician can perform more advanced tests to find major sources of air leakage. Table


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Strength characteristics and air leakage determinations for alternative mine seal designs Download PDF EPUB FB2

STRENGTH CHARACTERISTICS AND AIR-LEAKAGE DETERMINATIONS FOR ALTERNATIVE MINE SEAL DESIGNS By E. ~eiss,' N. ~renin~er,~ C. ~te~han,~ and J.

~ipscornb~ ABSTRACT The U.S. Bureau of Mines and the U.S. Mine Safety and Health Administration (MSHA) are participating jointly in a research program to evaluate the strength characteristics and.

Additional Physical Format: Online version: Strength characteristics and air leakage determinations for alternative mine seal designs (OCoLC) Mining Publication: Strength Characteristics and Air-Leakage Determinations for Alternative Mine Seal Designs Keywords: Seals Strength of materials Original creation date: January Get this from a library.

Strength characteristics and air-leakage determinations for alternative mine seal designs. [E S Weiss; United States. Bureau of Mines.;]. Strength Characteristics and Air-leakage Determinations for Alternative Mine Seal Designs; p.

[6] Hemp R. The effect of changes in barometric pressure on mines in the highveld of South by: 3. Strength characteristics and air-leakage determinations for alternative mine seal designs Evaluation of polymer construction material and water trap designs for underground coal mine seals.

Personal Author: (NIOSH) has conducted full-scale explosion experiments, to evaluate the strength characteristics of various seal designs, used for.

Strength characteristics and air-leakage determinations for alternative mine seal designs. Personal Author: Weiss, E. (Eric S.) "Strength characteristics and air leakage resistance of seals and designs of water traps used in underground coal mines were evaluated in a joint effort by the Pittsburgh Research Center and the Mine Safety and.

"Strength characteristics and air leakage resistance of seals and designs of water traps used in underground coal mines were evaluated in a joint effort by the Pittsburgh Research Center and the Mine Safety and Health Administration.

Strength characteristics and air-leakage determinations for alternative mine seal designs. Personal Author. The differences in seal designs covering the range from domestic goods and automotive through process plant to turbo machinery are covered.

The key features of compression packing and modern material options are presented. A wide range of other seal types are also used in rotating machinery, particularly in high-speed turbo machinery. stoppings and in situ assessment of air leakage characteristics of remote filled cement concrete plug by tracer gas technique by A.K.

Singh*, I. Ahmad*, N. Sahay*, N.K. Varma*, and V.K. Singh* Synopsis Between the main fan and the coalface in a mine a lot of air is lost through leakage at stoppings, doors, air-crossing etc.

so that a. All of the explosion and air leakage determination tests on the various seal designs were conducted in the LLEM ().

Lake Lynn Laboratory is one of' the world's foremost facilities for conducting large-scale mining health and safety research. The LLEM is unique in that it can simulate current U.S.

coal. Experimental Mine. Alternative seals were constructed in the Lake Lynn Mine and subjected to a side-on or static pressure of 20 psi from a methane explosion.

Following the test, air leakage across the seal was measured to determine whether the seal met post-test leakage requirements. The seals described in this guide were found to. Strength Characteristics and Air-Leakage Determinations for Alternative Mine Seal Designs Strengthening Existing psi Mine Ventilation Seals With Carbon Fiber-Reinforced Polymer Reinforcement Use of Ground Penetrating Radar and Schmidt Hammer Tests to Determine the Structural Integrity of a Mine Seal.

The regulation for underground mine seals includes a requirement for seals designed to 50 psi if the atmosphere behind the seal is inert and requires seals designed to at least psi if the atmosphere is not inert.

Sealed areas shall be monitored, whether ingassing or outgassing, for methane and oxygen concentrations and the direction of leakage. Strength Characteristics and Air-Leakage Determinations for Alternative Mine Seal Designs Strengthening Existing psi Mine Ventilation Seals With Carbon Fiber-Reinforced Polymer Reinforcement Page last reviewed: 9/21/ Page last updated: 9/21/ Strength Characteristics and Air-Leakage Determinations for Alternative Mine Seal Designs 1/1/ - Reports of Investigations During the normal course of underground coal mining, it sometimes becomes necessary to seal off abandoned areas to eliminate the need to ventilate them.

Seals and Sealing Handbook, 6th Edition provides comprehensive coverage of sealing technology, bringing together information on all aspects of this area to enable you to make the right sealing choice.

This includes detailed coverage on the seals applicable to static, rotary and reciprocating applications, the best materials to use in your sealing systems, and the legislature and regulations. "Strength characteristics and air leakage resistance of seals and designs of water traps used in underground coal mines were evaluated in a joint effort by the Pittsburgh Research Center and the Mine Safety and Health Administration.

ASTM's cement and concrete standards are instrumental in the evaluation and testing of concrete, cement, and aggregates. Concrete can have different properties depending upon the mixture that is used in creating it, which contains cement, chemical admixtures, and aggregates.

Each of the seal designs and the overcast side and wing walls used one or more air-inflated vinyl bladder assemblies anchored to the mine roof and hitched into the ribs and floor. The air within these bladders was displaced with a high-strength cementitious grout.

The overcast deck consisted of a mm (in) thick reinforced cementitious slab. Seal systems with liquid or gas barriers can minimize detectable leakage, but at significant increase in expense.

Beyond that solution, there are seal-less pumps such as canned or magnetically driven designs that can also be costly but completely leak free.

If the leakage is not an immediate health hazard, some systems. A methodology to design an air-lubricated piston seal for pneumatic actuators is described.

Such a seal permits a small air leakage through a very narrow gap between the seal lip and the counterpart; this air film both avoids contact and ensures lubrication at the seal-counterpart interface thus permitting reduced friction and wear.of the physical meaning of seal leakage, underlying theoretical governing formulas, typical (“order of magnitude”) leakage values and trends of different seal designs, and the effective limits of seal leakage is more than warranted.

The intention here is to create a comprehensive reference work that has global applicability and is.