API RP 1141:1994 pdf download.Guidelines for Confined Space Entry On Board Tank Ships in The Petroleum Industry
1.1 Scope
This recommended practice provides guidance for safly entering and working in confned spaces on board tank ships in the petroleum industry. The work procedures and recom mendations described in this recommended practice are based on a consensus among marine operators of the essen tial elements needed in a confned space entry program to prevent accidents, injuries, and illnesses. In addition, marine operators recognize that with the evolution of ship design more numerous, and potentially less accessible, confned spaces will be found on board tank ships, particularly those with double hull and double bottom construction. The concepts presented in this recommended practice are intended to aid the user in preparing detailed procedures for safely performing work in confned spaces. The types of confned spaces and their hazards will vary, but the funda mentals presented should be applicable, perhaps with modifications, to all confned spaces that may be encoun tered on board tank ships. These guidelines are not applicable to the following situ ations: a. Entry into confned spaces under emergency situations. b. Hot work in confned spaces (that is, any work involving sources of ignition suffciently high to cause the ignition of a fammable gas mixture). c. Tank ships that have been certifed “Safe fr Workers” by a marine chemist (see NFPA 306). This recommended practice does not address the specifc requirements of port authorities or federal, state, or local governments. In addition to these guidelines, users should refer to applicable port authority, federal, state, and local reg ulations pertinent to specifc circumstances.
1.3 Definitions
The following terms are used in this recommended practice: 1 .3.1 A tank ship is a tank vessel propelled by power or sail. 1.3.2 Confned spaces are enclosures with known or po tential hazards that have a restricted means of entrance and exit. These enclosures are not normally occupied by people or well ventilated. Examples of confned spaces on board tank ships include cargo, ballast, and fuel tanks; coferdams; duct keels; and spaces between decks or between cargo tanks and the outer hull (double hulls or double bottoms). Pump rooms have some of the characteristics of confned spaces al though they are intended for human entry. Under these guidelines, pumprooms are treated separately from other confned spaces. 1.3.3 An electrical circuit or part of a circuit is intrinsi cally safe if any spark or thermal effect produced normally (that is, by breaking or closing the circuit) or accidentally (for example, by short circuit or earth fault) is incapable, un der prescribed test conditions, of igniting a prescribed gas mixture. This defnition is consistent with the Interational Safety Guide for Oil Tankers & Terminals.
API RP 1141:1994 pdf download
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