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Safety Alerts
Immersion Suits Maintenance and Training


coast guardU.S. Coast Guard Marine Safety Office, Portland, Maine


Safety Alert 00-01

Immersion Suits – Maintenance and Training
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Coast GuardUnited States Coast Guard


Navigation and Vessel Inspection Circular No. 01-08

Shipboard Inspection and Testing of Immersion Suits
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International Maritime Organization

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1 The Maritime Safety Committee, at its seventy-eighth session (12 to 21 May 2004),
recognizing that shipboard inspections of immersion suits and anti-exposure suits carried out in
accordance with SOLAS regulation III/20.7 and MSC/Circ.1047 may not be adequate to detect
deterioration of seams and closures of the suits due to adhesive ageing, and having considered the
recommendation made by the Sub-Committee on Ship Design and Equipment at its forty-sixth
session, approved the Guidelines for periodic testing of immersion suit and anti-exposure suit seams
and closures, as set out in the annex.

2 Member Governments are invited to bring the annexed Guidelines to the attention of all
parties concerned.



1 Research performed by several Member Governments has demonstrated that the seams and
closures of immersion suits and anti-exposure suits experience deterioration over time. The rate and
severity of deterioration may vary widely, depending upon the specific components and procedures
employed in the manufacture of the suit and the conditions under which the suit is stored. However,
even under ideal conditions, the materials and adhesives used have a finite service life and will
inevitably experience a reduction in strength and/or loss of watertightness with age.

2 The Guidelines for monthly shipboard inspection of immersion suits and anti-exposure suits
(MSC/Circ.1047) are very helpful in identifying obvious problems with a suit, but do not adequately
address deterioration of seams and closures (zippers, etc.) which may not be readily apparent by
visual inspection. Such deterioration can be detected by pressurization of the suit with air, and
testing of the seams and closures for leaks with a soapy water solution.

3 To ensure the maintenance of adequate strength and watertightness of seams and closures of
immersion suits and anti-exposure suits with age, it is recommended that each suit be subjected to an
air pressure test such as the following, at intervals not exceeding three years, or more frequently for
suits over ten years of age:

  • A suitable head piece, fitted with a means to inject air into the suit, should be inserted
    into the face orifice of the suit and secured so as to minimize leakage around the face
    seal. A low-pressure monitoring device, either integral to the fitting for air injection
    or as a separate device, should also be inserted. If the suit is fitted with detachable
    gloves and/or boots, the wrists and/or cuffs should be sealed by inserting a short
    length of suitable diameter plastic pipe and securing the gloves and/or boots with
    suitable wire ties or hose clamps. The zipper should be fully zipped, and any face
    flap closed. The suit should then be inflated to a pressure of 0.7 to 1.4 kPa (0.1 to
    0.2 psi). If an auxiliary inflatable means of buoyancy is provided, it should be
    inflated through the oral valve to a pressure of 0.7 kPa (0.1 psi) or until firm to the
  • Each seam and closure of the suit - and each seam, oral tube and attachment points
    and joint or valve of any auxiliary inflatable means of buoyancy - should then be
    covered with a soapy water solution containing enough soap to produce bubbles (if
    leakage is noted at a foot valve to the extent that air pressure cannot be maintained,
    the valves should be sealed for the test).
  • If leaks are revealed by the propagation of bubbles at seams or closures, the leaking
    areas should be marked and, after cleaning the suit thoroughly with fresh water and
    drying it, repaired in accordance with the suit manufacturer's recommendations.
  • It is recommended that the air pressure test be performed at a suitable shore-based facility
    equipped to make any necessary repairs in accordance with the manufacturer's recommendations. In
    view of the wide variety of materials and adhesives used in immersion suits and anti-exposure suits,
    it is strongly recommended that any repairs to a suit be carried out by a facility which has access to
    the original manufacturer's recommended servicing instructions, parts and adhesives, and suitably
    trained personnel. The air pressure test may be carried out on board ship if suitable equipment is



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