Note: In some countries, where it is judged by a competent authority that the quality control procedures and reliability of manufacture of certain dry chemical internal hermetically sealed (welded seal) cartridge-type extinguishers are considered adequate, the first internal examination only may be delayed from the date of manufacturer until required by 4.3.2.5

4.3.2.5 In addition to the annual maintenance specified in 4.3.1 to 4.3.2.4, the maintenance procedures in accordance with Table 2 shall be performed at intervals not exceeding five years.

Note 1: Non-rechargeable fire extinguishers, other than clean agent types, shall be discharged and discarded not later than five years from their date of manufacture.

Note 2: Non-rechargeable fire extinguishers of the clean agent type shall be removed from service and returned to a recycling centre for recovery of the clean agent not later than five years from their date of manufacture.

4.3.2.6 Clean agent extinguishers shall not be discharged to the atmosphere but shall be emptied at intervals not exceeding five years by a method that permits recovery of the clean agent. Following emptying, the additional maintenance in accordance with Table 2 shall be performed. When emptied, measures should be taken to minimize any emissions of clean agents into the atmosphere.

Table 2

No.

Maintenance procedure

Category

...

...

...

2 (5years)

3 (5years)

1

Discharge the extinguisher completely. After discharge, the zero pressure gauge (where provided) shall indicate zero pressure, and an indicator (where provided) shall show a discharged position.

x

x

x

2

Open the extinguisher, clean the inside and examine the body internally for corrosion or damage. If the extinguisher is slightly corroded, or has sustained minor damage, it shall be discarded or subjected to hydrostatic testing. If heavily corroded or severely damaged, it shall be discarded.

...

...

...

x

x

3

Examine, as appropriate, the nozzle, strainer and hose, vent holes (or other venting device) in the cap or valve assembly, and the internal discharge tube. Clean, if necessary.

x

x

x

4

Examine all sealing washers and hose (if fitted), and replace if defective.

...

...

...

x

x

5

Check the operating mechanism for free movement and clean, rectify or replace as necessary.

x

x

x

6

Re-assemble the extinguisher and recharge. See 4.4.

...

...

...