683 resultados para pipe


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Mode of access: Internet.

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"December 1995."

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The Native Americans and Nature in Illinois activity book from the Illinois Department of Natural Resources (IDNR) is designed to supplement your curriculum in a variety of ways. The information and activities contained in this publication are targeted to grades kindergarten through three and can help you meet the following Illinois Learning Standards: 16.A.1a; 16.C.1a (U.S.).

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v. 1. Introduction. Britannia's pastorals. Books I and II.--v. 2. Britannia's pastorals. Book III. The Shepherd's pipe. The inner Temple masque. Miscellaneous poems. Notes. Index of names.

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"Authorities consulted" at beginning of each volume.

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With reproductions of original title-pages.

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For 1-4 men's voices with and without piano acc.

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Selected references: p. 27-28.

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1917-1928 Issued by the Association under Its Earlier Name: United Association of Journeymen Plumbers and Steam Fitters of the United States and Canada (on Cover: United Association, Journeymen Plumbers, Gas-Fitters, Steam-Fitters and Steam-Fitters Helpers, United States and Canada; Other Slight Variations)

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The initiation of stress corrosion cracking (SCC) was studied using scanning electron microscope observations of linearly increasing stress test specimens. SCC initiation from the following surfaces was studied: (i) initiation from the commercial pipe surface covered by the Zn coating, (ii) initiation from a mechanically polished surface with a deformed layer, and (iii) initiation from an electro-polished surface. SCC initiation involved different features for these surfaces as follows. (i) For the Zn coated commercial pipe surface, a crack in the Zn coating led to the dissolution of the deformed layer and when the deformed layer was penetrated, intergranular SCC initiation became possible. (ii) For a mechanically polished surface with a deformed layer, cracks in the surface oxide concentrated the anodic dissolution to such an extent that there was transgranular SCC in the deformed layer. SCC was intergranular when the deformed layer had been penetrated. Transgranular stress corrosion cracks were stopped at ferrite grain boundaries (GBs) oriented perpendicular to the SCC propagation direction. (iii) For an electro-polished surface, the surface oxide film was cracked at many locations, but intergranular SCC only propagated into the steel when the oxide crack corresponded to a GB. An oxide crack away from a GB is expected to be healed. The observed SCC initiation mechanism was not associated with simple preferential chemical attack of the ferrite GBs. (C) 2003 Elsevier Ltd. All rights reserved.

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Stress corrosion cracks (SCC) had been found in a natural gas transmission pipeline during a dig-up and inspection program. The question was raised as to whether the SCC was active or dormant. This paper describes the resultant investigation to determine if a particular service crack was actively growing. The strategy adopted was to assess the appearance of the fracture surface of the service crack and to compare with expectations from laboratory specimens with active SCC. The conclusions from this study are as follows. To judge whether a crack in the service pipe is active or dormant, it is reasonable to compare the very crack tip of the service crack and a fresh crack in a laboratory sample. If the crack tip of the active laboratory sample is similar to that of the service pipe, it means the crack in the service pipe is likely to be active. From the comparison of the crack tip between the service pipe and the laboratory samples, it appears likely that the cracks in the samples extracted from service were most likely to have been active intergranular stress corrosion cracks. (C) 2003 Elsevier Ltd. All rights reserved.