Code of Federal Regulations · Section
§ 153.407 — Special Requirements For Sounding Tube Gauges
46 C.F.R. § 153.407
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(a) A sounding tube installed as a restricted gauge must extend to within one meter (approx. 39.4 in.) of the bottom of the tank.
(b) A sounding tube must not be installed on a tank whose relief valve setting exceeds 28 kPa (approx. 4 psig) unless it is specifically permitted by the Commandant (CG-ENG).
(c) A sounding tube must have no perforations in the tube wall.
Authorizing Statute
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Administration and enforcement33 U.S.C. § 1903
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General regulatory authority49 U.S.C. § 5103
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Regulations46 U.S.C. § 3703