06-096 C.M.R. ch. 120, § 4 - Tightness Standard
A. A tank truck
subject to the provisions of this Chapter may sustain a pressure change of no
more than 3 inches of water over five consecutive minutes when pressurized to a
gauge pressure of 18 inches of water or when evacuated to a gauge pressure of 6
inches of water when tested using the procedure specified in Section 5.
B. A tank truck certified
according to Section 5 must remain leak-tight for the 12 months following the
certification test. To verify that this requirement is being met, spot checks
with a combustible gas detector must not reveal readings equal to or greater
than 100 percent LEL (measured as 2.2 percent propane or equivalent percent of
another calibration gas by volume in air) when measured at a distance of one
inch (2.5 cm) from potential leak sources, and no visible or audible liquid or
vapor leaks must be observed.
Notes
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