Evaluation of the U.S. Divers Nordic Scuba Regulator for Use in Cold Water.

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Evaluation of the U.S. Divers Nordic Scuba Regulator for Use in Cold Water.

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Title: Evaluation of the U.S. Divers Nordic Scuba Regulator for Use in Cold Water.
Author: Clarke, JR; Junker, DL; Rainone, M
Abstract: NFDU tested the breathing effort and susceptibility to freeze-up of the U.S. Divers Nordic SCtIBA regulator. Five regulators were tested in 28%F (-20C) salt water, at depths to 198 fsw (60.7 msw). The probability of regulator failure was computed from the number of cold induced incidents, and the time to failure for each incident. There were no freeze-ups of the first or second stages. However, resistive effort was remarkably high, especially at low bottle pressures. The first stage regulator frequently malfunctioned due to the loss of silicon oil. High breathing pressure events during the resistive effort measurements occurred at mass flow rates exceeding 300 g/min at a 1500 psi supply pressure. Due to leakage of silicone oil and high breathing effort at low bottle pressures, the U.S. Divers Nordic is not recommended for Navy use in cold water (28"F) at any depth.
Description: Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested.
URI: http://archive.rubicon-foundation.org/4106
Date: 1996

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