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Safety of wet welding with increased open circuit voltages up to 150 V d.c.

Technical Report:

Abstract

An experimental test programme was performed to demonstrate that wet welding with open circuit voltages up to 150 V d.c. would not result in dangerous situations for the diver induced by electric shock. Sea water, fresh water, different types of diving suits and some worst case situations, resulting from a disregard of good working practice were considered to be test parameters. In sea water a diver will not be endangered by corresponding electric potentials if good working practice is adopted. This was demonstrated even for worst case conditions, e.g. water leakage into the dry suit, accidental positioning to the diver between torch and work piece (stretched arm) and partial removal of coating from the welding rod. The fresh water tests demonstrated higher voltages on the diver but well below accepted threshold limit values. The term `fresh water` should be critically considered, however, the test results relate only to the water conductivity studied. (orig.) With 30 figs. [Deutsch] Mit einem experimentellen Versuchsprogramm sollte der Nachweis gefuehrt werden, dass beim Nassschweissen mit Leerlaufspannungen bis zu 150 V GS eine Gefaehrdung des Tauchers durch elektrischen Schock nicht gegeben ist. Seewasser, Frischwasser, unterschiedliche Tauchanzuege sowie einige Worst-case-Faelle infolge Nichtbeachtung bewaehrter Arbeitspraktiken wurden als Versuchsparameter  More>>
Authors:
Schmidt, K; Kozig, G; [1]  Ross, J A.S.; [2]  Green, H L [3] 
  1. GKSS, Inst. fuer Anlagentechnik, Geesthacht-Tesperhude (Germany)
  2. Univ. of Aberdeen, Medical School (United Kingdom)
  3. Brunel Univ., Inst. for Bioengineering, Uxbridge (United Kingdom)
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
GKSS-91/E/30
Reference Number:
SCA: 422000; PA: DEN-92:000983; SN: 92000657219
Resource Relation:
Other Information: PBD: 1991
Subject:
42 ENGINEERING; WELDING; SAFETY; UNDERWATER OPERATIONS; ELECTRIC POTENTIAL; 422000; MINING AND UNDERGROUND ENGINEERING
OSTI ID:
10115858
Research Organizations:
GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht-Tesperhude (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE92766335; TRN: DE9200983
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
50 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Schmidt, K, Kozig, G, Ross, J A.S., and Green, H L. Safety of wet welding with increased open circuit voltages up to 150 V d.c.. Germany: N. p., 1991. Web.
Schmidt, K, Kozig, G, Ross, J A.S., & Green, H L. Safety of wet welding with increased open circuit voltages up to 150 V d.c.. Germany.
Schmidt, K, Kozig, G, Ross, J A.S., and Green, H L. 1991. "Safety of wet welding with increased open circuit voltages up to 150 V d.c." Germany.
@misc{etde_10115858,
title = {Safety of wet welding with increased open circuit voltages up to 150 V d.c.}
author = {Schmidt, K, Kozig, G, Ross, J A.S., and Green, H L}
abstractNote = {An experimental test programme was performed to demonstrate that wet welding with open circuit voltages up to 150 V d.c. would not result in dangerous situations for the diver induced by electric shock. Sea water, fresh water, different types of diving suits and some worst case situations, resulting from a disregard of good working practice were considered to be test parameters. In sea water a diver will not be endangered by corresponding electric potentials if good working practice is adopted. This was demonstrated even for worst case conditions, e.g. water leakage into the dry suit, accidental positioning to the diver between torch and work piece (stretched arm) and partial removal of coating from the welding rod. The fresh water tests demonstrated higher voltages on the diver but well below accepted threshold limit values. The term `fresh water` should be critically considered, however, the test results relate only to the water conductivity studied. (orig.) With 30 figs. [Deutsch] Mit einem experimentellen Versuchsprogramm sollte der Nachweis gefuehrt werden, dass beim Nassschweissen mit Leerlaufspannungen bis zu 150 V GS eine Gefaehrdung des Tauchers durch elektrischen Schock nicht gegeben ist. Seewasser, Frischwasser, unterschiedliche Tauchanzuege sowie einige Worst-case-Faelle infolge Nichtbeachtung bewaehrter Arbeitspraktiken wurden als Versuchsparameter beruecksichtigt. In Seewasser wird der Taucher nicht durch entsprechende elektrische Potentialverteilungen gefaehrdet, wenn bewaehrte Arbeitspraktiken eingehalten werden. Dies gilt auch fuer Worst-case-Faelle, etwa fuer den Fall einer Wasserleckage in einem Trockentauchanzug, die unfallbedingte Positionierung des Tauchers zwischen Schweisselektrode und Werkstueck (ausgestreckter Arm) und teilweise Entfernung der Ummantelung der Schweisselektrode. In Frischwasser wurden erhoehte Spannungen am Taucher gemessen, allerdings deutlich unterhalb anerkannter Gefaehrdungswerte. Beim Begriff `Frischwasser` ist jedoch zu beruecksichtigen, dass die Versuchsergebnisse nur fuer die beim Experiment vorgegebene elektrische Leitfaehigkeit des Wassers gelten. (orig.) With 30 figs.}
place = {Germany}
year = {1991}
month = {Dec}
}