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183.550
(A)
EACH FUEL TANK SUPPORT, CHOCK, OR STRAP THAT IS NOT INTERGRAL
WITH A METALLIC FUEL TANK MUST BE INSULATED FROM THE TANK SURFACE
BY A NON-MOISTURE ABSORBING MATERIAL.
Unless
a metallic fuel tanks has built-in rneans for supporting and holding
the fuel tank in place, a non-moisture absorbing material must
be between the fuel tank surface and the support, chock, or strap.
The non-moisture absorbing quality of the material is necessary
to prevent localized corrosion of the fuel tank that might occur
if moisture was trapped at the support-tank interface for a prolong
period of time.
The
following table lists some material that appear to be suitable
and some that should be avoided. Care should be taken to avoid
abrasive combination of materials even though it is not a mandated
requirement.
Basically,
this requirement provides for the isolation of the metallic fuel
tank from potentially moisture ladden support system and also
from abrasion by the supports, chock, or strap.
FUEL
TANK ISOLATION MATERIALS
| SUITABLE |
UNSUITABLE |
| Neoprene |
Foams |
| Teflon |
Carpeting |
| High
Density Plastics |
Cardboard |
| |
Felt |
| |
Wood |
| |
Canvas |
NOTE:
This list is not limited to the material to be included. They
are to establish the intent of the regulatory requirements prohibiting
moisture absorbing materials.
Coast
Guard, DOT
Manufacturer
Requirements
§183.550
Fuel tanks: Installation
(a)
Each fuel tank must not be integral with any boat structure or
mounted on an engine.
(b) Each fuel tank must not move at the mounting surface more
than one-fourth inch in any direction.
(c) Each fuel tank must not support a deck, bulkhead, or other
structural component.
(d) Water must drain from the top surface of each metallic fuel
tank when the boat is in its static floating position.
(e) Each fuel tank support, check, or strap that is not integral
with a metallic fuel tank must be insulated from the tank surface
by a nonmoisture absorbing material.
(f) Cellular plastic must not be the sole support for a metallic
fuel tank.
(g) If cellular plastic is the sole support of a non-metallic
fuel tank, the cellular plastic must meet the requirements of
§183.516 (b) or (c).
(h) Each fuel tank labled under §183.514 (b)(8) for installation
aft of the boat’s half length must be installed with its
center of gravity aft of the boat’s half length.
[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 81-092,
48 FR 55737, Dec. 15, 1983]
S.P.
Sheet Metal Company is not responsible for the installation of
tanks. This document is posted for your information out of The
Coast Guard Code of Regulations.
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