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IACS Guideline for Procedures of Testing Tanks and Tight Boundaries

1.

General

These test procedures are to ensure the weathertightness of structures/shipboard outfitting, the watertightness of tanks and watertight boundaries and structural adequacy of tanks. Tightness of all tanks and tight boundaries of the ships at the new construction and, when major conversions or repairs* have been made, those relevant to the major conversions/repairs should be confirmed by these test procedures prior to delivery of the ship. * Major repair means a repair affecting structural integrity.

2.

Application

2.1 All gravity tanks** and other boundaries required to be watertight or weathertight should be tested in accordance with this Guideline and proven tight and structurally adequate as follows: Gravity Tanks for their tightness and structural adequacy Watertight Boundaries Other Than Tank Boundaries for their watertightness, and Weathertight Boundaries for their weathertightness

** Gravity tank means a tank having a design working pressure not greater than 70 kPa at the top of the tank. 2.2 The testing of cargo containment systems of liquefied gas carriers should be in accordance with standards deemed appropriate by the Administration. 2.3 Testing of structures not listed in Table 1 or 2 should be specially considered.

3. 3.1

Types of Tests and Definition of Test The following two types of test are specified in this requirement:

Structural Test: A test to verify the structural adequacy of the construction of the tanks. This may be a hydrostatic test or, where the situation warrants, a hydropneumatic test. Leak Test: A test to verify the tightness of the boundary. Unless a specific test is indicated, this may be a hydrostatic/hydropneumatic test or air test. Leak test with remark

*3 in Table 1 includes hose test as an acceptable medium of the test. 3.2 Definition of each type of test is as follows: A test by filling the space with a liquid to specified head. A test wherein space is partially filled with liquid and air pressure applied on top of the liquid surface. A test to verify the tightness of the joint by a jet of water. A test to verify the tightness by means of air pressure differential and leak detection solution. It includes tank air test and joint air test, such as compressed air test and vacuum box test. An air test of fillet welded tee joint and leak indicating solution applied on the fillet welds. A box over a joint with leak indicating solution applied on the fillet or butt welds. Vacuum is created inside the box to detect any leaks. A test to verify the tightness of a sealing by means of ultrasonic. A test to verify that no continuous leakages exist in the boundaries of a compartment by means of low surface tension liquids.

Hydrostatic Test: (Leak and Structural) Hydropneumatic Test: (Leak and Structural) Hose Test: (Leak) Air Tests: (Leak)

Compressed Air Fillet Weld Test: (Leak) Vacuum Box Test: (Leak)

Ultrasonic Test: (Leak) Penetration Test: (Leak)

4. 4.1

Test Procedures General

Tests should be carried out in the presence of the Surveyor at a stage sufficiently close to the completion of the work with all hatches, doors, windows, etc. installed and all penetrations including pipe connections fitted, and before any ceiling and cement work is applied over the joints. Specific test requirements are given in 4.4 and Table 1. For the timing of application of coating and provision of safe access to joints, see 4.5, 4.6 and Table 3.

4.2 4.2.1

Structural Test Procedures Type and Time of Test

Where a structural test is specified in Table 1 or Table 2, a hydrostatic test in accordance with 4.4.1 will be acceptable. Where practical limitations (strength of building berth, light density of liquid, etc.) prevent the performance of a hydrostatic test, a hydropneumatic test in accordance with 4.4.2 may be accepted as an equivalent method. Provided the results of a leak test...
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