34.B Confined and Enclosed Spaces on Ships and Vessels (defined as any watercraft).
The following applies only to ship and vessel repair and maintenance, not operational ship and vessel activities. > See Section 19; See Appendix Q for CS definitions.
34.B.01 All spaces on a vessel or ship or floating plant that could be considered a "Potential Confined Space", must be posted as a "Potential Confined Space".
- If the potential CS has an oxygen deficient atmosphere, the space must be labeled "Not Safe for Workers".
- If the potential CS has an oxygen-enriched atmosphere, the space must be labeled "Not Safe for Workers - Not Safe for Hot Work".
- If the potential CS contains a flammable gas or vapor at 10% or higher than the lower explosive limit (LEL) for the gas, then the space must be labeled "Not Safe for Workers - Not Safe for Hot Work".
- If the CS contains a potential atmosphere that is toxic, corrosive, or irritants that exceed the OEL, the space must be labeled "Not Safe for Workers".
- An inventory of these spaces must be maintained in the pilot house and the land- based office.
34.B.02 Before and during entry into the types of spaces listed below, the Competent Person for Confined Spaces in ships and vessels (CPCSSV) must test for oxygen content, flammability, and toxicity. These tests and all entries must be recorded on an entry form or in an entry log which will be reviewed by the GDA. At a minimum, the entry log or form must have the time and date, monitoring device type, model, serial number, and calibration date, and the name of the individual doing the testing.
- Unventilated CSs that have been closed up or freshly painted;
- CSs that have contained or do contain combustible or flammable liquids or gases;
- CSs that have contained or do contain toxic, corrosive, or irritant liquid, gases, or solids.
Knowledge Check Choose the best answer for the question.
34-6. What is required if the potential confined space contains a flammable gas or vapor at 10% or higher than the lower explosive limit (LEL) for the gas?
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