Procurement of Safe Viewports for Hyperbaric Chambers

1971 ◽  
Vol 93 (4) ◽  
pp. 943-952 ◽  
Author(s):  
J. D. Stachiw ◽  
K. O. Gray
Keyword(s):  
Quality Control ◽  
Pressure Vessel ◽  
Design Criteria ◽  
Hyperbaric Chamber ◽  
Periodic Inspection ◽  
Proof Testing ◽  
Practical Guidelines ◽  
Material Fabrication ◽  
Paper Address ◽  
Selection Of

Lack of ASME Pressure Vessel Code Standards for the selection of material, designs, fabrication techniques, and prooftesting methods for viewports in hyperbaric chambers makes it mandatory that engineering judgment be exercised to the fullest in the procurement of such viewports. Based on the experience gained by the authors in past experimental programs dealing with design criteria, and procurement of acrylic viewports for major Navy hyperbaric chamber installations, practical guidelines are proposed for specifying such viewports. The guidelines contained in this paper address themselves to selection of viewport shape, safety factor, material, fabrication, quality control, proof-testing, and periodic inspection.

Design criteria for exposed hydro penstocks

1978 ◽  
Vol 5 (3) ◽  
pp. 340-351 ◽  
Author(s):  
J. L. Gordon
Keyword(s):  
Quality Control ◽  
Pressure Vessel ◽  
High Strength Steel ◽  
High Strength ◽  
Design Criteria ◽  
Similar Work ◽  
Wide Range ◽  
Different Types ◽  
Control Procedures ◽  
American Society

At present there are no national codes for the design of exposed hydro-electric penstocks. Thus an engineer must either make reference to other national codes for similar work, such as the American Society of Mechanical Engineers boiler and pressure vessel code or the American Water Works Association Standard for steel water piping, or he must write his own code and is then faced with the decision of having to select design criteria that must cover a wide range of steels; different operating and waterhammer conditions; a wide range of quality control procedures used in manufacture and erection of the penstock; and different types of penstocks, isostatic where the stresses can be calculated with precision, and hyperstatic where the stress calculation is more imprecise. This paper discusses design criteria, factors of safety, and corresponding quality control procedures that can be used for either isostatic or hyperstatic penstocks using mild, intermediate, or high strength steel for penstocks supplying reaction of impulse turbines.

Development of Design Criteria for a High Pressure Vessel Construction Code

1987 ◽  
Vol 109 (2) ◽  
pp. 256-259 ◽  
Author(s):  
G. J. Mraz
Keyword(s):  
High Pressure ◽  
Pressure Vessel ◽  
High Strength Steels ◽  
High Strength ◽  
Design Criteria ◽  
Construction Methods ◽  
Shrink Fitting ◽  
Section Viii ◽  
Pressure Stress ◽  
Selection Of

Out of concern for public safety, most legal jurisdictions now require unfired pressure vessel construction to comply with the ASME Boiler and Pressure Vessel Code. Because the present two divisions of Section VIII of that Code are not well suited for high pressure design, a new division is needed [1]. The currently anticipated main design criteria of the proposed division are full plastic flow or full overstrain pressure, stress intensity in the bore, fatigue, and fracture mechanics. The rules are expected to allow better utilization of high strength steels already included in the present Section VIII. At the same time materials of even higher strength are introduced. The benefits of compressive prestress are recognized. Construction methods allowing it’s achievement, such as autofrettage, shrink fitting and wire winding are included. Reasons for selection of the criteria are given.

Selection of standard facilities for periodic inspection using probabilistic criteria

1977 ◽  
Vol 20 (7) ◽  
pp. 954-959
Author(s):  
N. N. Vostroknutov ◽  
M. A. Zemel'man ◽  
V. M. Kashlakov
Keyword(s):  
Periodic Inspection ◽  
Probabilistic Criteria ◽  
Selection Of

The effect of proof testing on the shakedown behaviour of pressure vessel nozzles

1994 ◽  
Vol 29 (2) ◽  
pp. 81-92 ◽  
Author(s):  
N I Crawley ◽  
D N Moreton ◽  
D G Moffat ◽  
A F Tolley
Keyword(s):  
Stainless Steel ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Steel Type ◽  
Pressure Cycling ◽  
Proof Testing ◽  
Pressure Tests ◽  
Test Pressure ◽  
Design Pressure

Cyclic internal pressure tests were conducted over several hundreds of cycles at pressures up to and in excess of the calculated proof test pressure on two nominally ‘identical’, stainless steel type 316 flush 90 degrees pressure vessel nozzles, designed and manufactured to BS 5500. Prior to this pressure cycling, one vessel was subjected to the required proof test of 1.25 times the design pressure. Significant incremental straining was recorded in the non-proof tested vessel during cycling at all pressures above the first yeild pressure (0.336 × design pressure). For the proof tested vessel significant incremental straining was not recorded during cycling until 15 percent above the design pressure.

scholarly journals Tracing total and dissolved material in a western Canadian basin using quality control samples to guide the selection of fingerprinting parameters for modelling

CATENA ◽  
2021 ◽  
Vol 200 ◽  
pp. 105095
Author(s):  
J.P. Laceby ◽  
P.V.G. Batista ◽  
N. Taube ◽  
M.K. Kruk ◽  
C. Chung ◽  
...  
Keyword(s):  
Quality Control ◽  
Canadian Basin ◽  
Selection Of ◽  
Control Samples

scholarly journals Expanding HadISD: quality-controlled, sub-daily station data from 1931

2016 ◽  
Author(s):  
Robert J. H. Dunn ◽  
Kate M. Willett ◽  
David E. Parker ◽  
Lorna Mitchell
Keyword(s):  
Quality Control ◽  
Wind Speed ◽  
Time Range ◽  
Underlying Structure ◽  
Control Procedure ◽  
Future Projections ◽  
Quality Control Procedure ◽  
Temporal Coverage ◽  
Extremes Of Temperature ◽  
Selection Of

Abstract. HadISD is a sub-daily, station-based, quality-controlled dataset designed to study past extremes of temperature, pressure and humidity and allow comparisons to future projections. Herein we describe the first major update to the HadISD dataset. The temporal coverage of the dataset has been extended to 1931 to present, doubling the time range over which data are provided. Improvements made to the station selection and merging procedures result in 7677 stations being provided in version 2.0.0.2015p of this dataset. The selection of stations to merge together making composites has also been improved and made more robust. The underlying structure of the quality control procedure is the same as for HadISD.1.0.x, but a number of improvements have been implemented in individual tests. Also, more detailed quality control tests for wind speed and direction have been added. The data will be made available as netCDF files at www.metoffice.gov.uk/hadobs/hadisd and updated annually.

scholarly journals Application of analytic hierarchy process to evaluate design criteria for humane trap cage.

2020 ◽  
Vol 4 (2) ◽  
pp. 30-35
Author(s):  
Sivajothi Paramasivam ◽  
Hari Krishnan Munisamy ◽  
Santhansamy Rayappan
Keyword(s):  
Analytic Hierarchy Process ◽  
Low Cost ◽  
Quality Criteria ◽  
Design Criteria ◽  
Animal Population ◽  
Chronic Infections ◽  
Analytic Hierarchy ◽  
The Public ◽  
Hierarchy Process ◽  
Selection Of

Atrocities against stray animal’s especially large number of scavenging street dogs have increased at an alarming rate nationwide. Relevant authorities, in view of controlling stray animal population and curb chronic infections mulled cracking down on stray dogs using inhumane methods such as usage of tranquilizers or forcefully capturing. Thus, causing injuries, trauma and potentially death to these captured strays. Even though statistics about the number of violent incidents against strays remains unknown but animal welfare groups report constant complaints regarding animal cruelty. Animal activists mooted a request to design and built a modernize efficient yet low cost trap cage with a provision of technology which are normally ignored by many quarters; as a vehicle to educate the public on humane and compassionate ways to treat stray animals.   The design of the cage involves consists of 3 parts, which was electronics hardware, communication system and critically the structure hardware whereby to withstand the possible aggressiveness of the animal. The objective of this paper is to present and apply the techniques of the analytic hierarchy process (AHP) in the prioritization and selection of design criteria of the trap cage. The finding shows that out of 5 design criteria, quality criteria is the most important criteria in designing of a humane trap cage issue. This is followed by innovativeness, cost, safety and aesthetics factors.

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