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1 Scope  上海鼎徵仪器仪表设备有限公司
This International Standard specifies a test method for the assessment of the resistance of coatings to
pressure water-jetting. The test method simulates the effects pressure water-jetting has on a coating.
5 Apparatus and materials
Ordinary laboratory apparatus, together with the following:
5.1 Pressure water-jet, consisting of a high-pressure pump and a nozzle.
A high-pressure pump conveys the water from a storage bin. To avoid influences from variations in
pressure, it is necessary that the pressure and the volumetric flow rate be adjustable at the nozzle
described below.
The water temperature shall be adjustable to ± 2 °C.
The temperature shall be adjusted in accordance with Annex A. Necessary safety devices on the pressure
side of the unit, as e.g. pressure relief valve and by-pass valve, shall exist. If the jetting is unsteady, a flow
calming section may be installed in front of the nozzle. A pulsation of the water jet at the opening of the
pump is inadmissible. In order to reach a reproducible result, the nozzle shall be solidly mechanically
fixed and the test specimen shall be secured against slipping. For the adjustment of the volumetric flow
rate, a nozzle with a jet angle of 25° and a volumetric flow rate of 6 l/min at 2 MPa (20 bar) is required
(see Annex A).
The following technical data should be attainable:
— volumetric flow rate: 8 l/min to 14 l/min
— pressure: 4 MPa (40 bar) to 13 MPa (130 bar)
— temperature: 20 °C to 80 °C
— jetting time: 10 s to 300 s
 

Figure 1 shows the schematic construction of a pressure water-jet apparatus which is specially built for these tests.

8.1 Introducing the cut or the scribe  上海鼎徵仪器仪表设备有限公司
Make sure that the test specimen is securely fastened when introducing the cut or the scribe.
Introduce both of the cuts or scribes vertically through the coating into the substrate using the cutting
or scribing tool, as shown in Figure 2. The depth of the cut or scribe into the substrate should be as
minimal as possible. The length of the first cut or scribe shall be at least 100 mm, if the geometry of the
part allows that. At an angle, introduce a second cut or scribe with a minimum length of 20 mm. The
cuts or scribes shall be introduced straight-line at an angle of approximately 30°. An automatic cutting
or scribing device may be used. Residues of the coating shall be removed from the cut or scribe.
NOTE The depth of the cut or scribe into the substrate influences the result.
The cutting or scribing tools should be checked regularly and replaced if necessary.

   Figure 2 — Introducing the cuts or scribes (St Andrew’s cross)

8.2 Testing
After inserting the test specimen into the apparatus (e.g. using a spacer block), calibrate the space
between test specimen and nozzle.
Operate the pressure water-jetting apparatus at room temperature.
Three test methods (A, B, or C – see Table 1) are preferred as well as three possible scribing tools (C, L, or
S – see 5.3). The test method to be applied, the scribing or cutting tool to be used, and the water pressure
shall be agreed.
Table 1 — Test methods  上海鼎徵仪器仪表设备有限公司
 

 
For jetting, deionized water should be used.
When using automatic and manual devices, fasten the test specimen so that the water jet impacts as
shown in Figure 3. The jet impacts in the middle above the point of intersection onto the longer one of both cuts/scribes.

Figure 3 — Jetting area

After jetting, the length and the width of the impact are measured. See Figure A.1.
The mean length of the impact shall be (73 ± 5) mm and the mean width (8 ± 1) mm on average.

Figure A.1 — Measures of the washed-out areas in the polystyrene rigid plastic foam