5.21 Clogging test (see 4.22 ) [7.28]
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Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.800(19) – Revised Guidelines for Approval of Sprinkler Systems Equivalent to that Referred to in SOLAS Regulation II-2/12 – (Adopted on 23 November 1995) - Appendix 1 - Component Manufacturing Standards for Water Mist Nozzles - 5 Methods Of Test [7] - 5.21 Clogging test (see 4.22) [7.28]

5.21 Clogging test (see 4.22 ) [7.28]

  5.21.1 The water flow rate of an open water mist nozzle with its strainer or filter should be measured at its rated working pressure. The nozzle and strainer or filter should then be installed in test apparatus described in Figure 3 and subjected to 30 min of continuous flow at rated working pressure using contaminated water which has been prepared in accordance with 5.21.3.

Figure 3 Clogging Test Apparatus

  5.21.2 Immediately following the 30 min of continuous flow with the contaminated water, the flow rate of the nozzle and strainer or filter should be measured at rated working pressure. No removal, cleaning or flushing of the nozzle, filter or strainer is permitted during the test.

  5.21.3 The water used during the 30 min of continuous flow at rated working pressure specified in 5.21.1 should consist of 60 l of tap water into which has been mixed 1.58 kg of contaminants which sieve as described in Table 5. The solution should be continuously agitated during the test.

Table 5 Contaminant for Contaminated Water Cycling Test

Table 6 — Contaminant for the contaminated water cycling test
SIEVE DESIGNATION NOMINAL SIEVE OPENING, MM GRAMS OF CONTAMINANT (+/- 5 PERCENT)
PIPE SCALE TOP SOIL SAND
No. 25 0.706 — 456 200
No. 50 0.297 82 82 327
No. 100 0.150 84 6 89
No. 200 0.074 81 — 21
No. 325 0.043 153 — 3
  Total 400 544 640

  5.21.4 Alternative supply arrangements to the apparatus shown in figure 3 may be used where damage to the pump is possible. Restrictions to piping defined by note 2 of table 5 should apply to such systems.

Parent topic: 5 Methods Of Test [7]
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