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APPENDIX B
MARINE CHEMIST CERTIFICATE
SERIAL NO. ^
In the event of any physical or atmospheric changes adversely affecting the Standard
Safety Designations assigned to any of the above spaces, or if in any doubt, immediately
stop all work and contact the undersigned marine chemist.
STANDARD SAFETY DESIGNATIONS ^
SAFE FOR WORKERS ^
Means that in the compartment or space so designated: (a) the
oxygen content of the atmosphere is at least 19.5 percent and not more than 23 percent by
volume; and that, (b) toxic materials in the atmosphere are within permissible
concentrations; and that (c) the residues cannot produce toxic materials under existing
atmospheric conditions while maintained as directed on the marine chemist's certificate.
NOT SAFE FOR WORKERS ^
Means that in the compartment or space so designated, the
requirements of Safe for Workers have not been met.
SAFE FOR HOT WORK ^
Means that in the compartment so designated (a) oxygen content
of the atmosphere is at least 19.5 per cent and not more than 23 percent by volume, except
for inerted spaces or where external hot work is to be performed; and that, (b) the
concentration of flammable materials in the atmosphere is below 10 per cent of the lower
flammable limit; and that, (c) the residues cannot produce a higher concentration than
permitted by (b) under existing atmospheric conditions in the presence of fire and while
maintained as directed on the marine chemist's certificate; and further, that (d) all
adjacent spaces containing, or having contained, flammable or combustible materials have
been cleaned sufficiently to prevent the spread of fire; or are satisfactorily inerted;
or, in the case of fuel tanks or lube oil tanks, or engine room, or fire room bilges, have
been treated in accordance with the marine chemist's requirements.
NOT SAFE FOR HOT WORK ^
Means that in the compartment so designated, the
requirements of Safe for Hot Work have not been met.
SAFE FOR REPAIR YARD ENTRY ^
Means that the compartments and spaces of the flammable
cryogenic liquid carrier so designated (a) have been tested by sampling at remote sampling
stations, and results indicate the atmosphere tested to be above 19.5 per cent oxygen and
less than 10 percent of the lower flammable limit; or (b) the compartments are
inerted.
QUALIFICATIONS ^
Unless specifically approved in this certificate, transfer of ballast or manipulation
of valves, closure equipment tending to alter conditions in pipe lines, tanks, or
compartments subject to gas accumulation requires inspection and endorsement, or reissue
of the certificate for the spaces so affected. All lines, vents, heating coils, valves and
similarly enclosed appurtenances shall be considered ² Not
Safe² unless otherwise specifically designated.
CHEMIST'S ENDORSEMENT ^
This is to certify that I have personally determined that all spaces in the foregoing
list are in accordance with the Gas Hazard Control Standard TP 3177, and I have found the
condition of each to be in accordance with its assigned designation.
This Certificate is based on conditions existing at the time the inspection herein set
forth was completed and is issued subject to compliance with all qualifications and
instructions.
Signed ________________________________________________________
Marine Chemist
The undersigned acknowledges receipt of this Certificate under section 10, Gas Hazard
Control Standard, and understands the conditions and limitations under which it was
issued.
Signed
________________________________________________________
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