Standard Interpretations - Table of Contents|
| Standard Number:||1910.106; 1910.106(b); 1910.106(b)(4)(ii); 1910.106(e); 1910.106(e)(2)(ii)(c); 1910.106(e)(2)(iii); 1910.106(e)(2)(iv)(d); ; 1910.106(e)(3)(v)(a); 1910.106(e)(3)(vi); 1910.106(h)(4)(iii)(a); 1910.119(e)(1); 1910.1000|
17.11.6 Recirculation of the exhaust air shall be permitted only when it is monitored continuously using a fail-safe system that is designed to automatically sound an alarm, stop recirculation, and provide full exhaust to the outside in the event that vapor-air mixtures in concentrations over one-fourth of the lower flammable limit are detected.Therefore, although §1910.106(e)(2)(iii) does not explicitly require fresh air to prevent the short circuiting of the ventilation, when recirculated air is used, OSHA expects the controls listed in NFPA 30-2008 paragraph 17.11.6 to be used to control a potential fire/explosion hazard that could seriously or fatally injure employees. OSHA may find that the failure to do so constitutes a violation of the General Duty Clause of the OSHAct (29 USC §654(a)(1)).
a) through a closed piping; orTherefore, pouring (i.e., one means of gravity transfer) flammable and combustible liquids into an open manway of a process tank/vessel would be allowed (for operations covered under 1910.106(e)(2)) per the language of the standard, "from safety cans" or "from a container or portable tanks by gravity through an approved self-closing valve." However, during such a pouring operation (as stated in the question), the employer must take measures for protection against static sparks (see §1910.106(e)(6)(i)), through bonding and grounding methodologies, e.g., by electrically interconnecting the transfer nozzle of the pouring container and the tank and by ascertaining that the receiving tank is grounded to dissipate any potential static current that may have generated during the pouring operation.
b) from safety cans; or
c) by means of a device drawing through the top; or
d) from a container or portable tanks by gravity through an approved self-closing valve.
|Standard Interpretations - Table of Contents|
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