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8.7. Blast and Air Hose Couplings: All air hose, blast hose, and threaded couplings have two pin
holes that align when connected. To protect against accidental hose disconnections safety pins
must be installed through these holes. Each hose connection must also include a hose whip
check that will hold the hose if there is an accidental disconnection. Connect one loop to each
side of the connection and stretch out as shown in Figure 8.2 below. Check hose connections
daily and replace missing or damaged pins and whip checks.
Failure to install safety pins on all air and blast hose couplings can result in hose disconnects
and could result in serious injury or death.
Figure 8.2 – Hose Connection Disconnect Protection
8.8. Blast and Air Hose Gaskets: All air hose, blast hose, and threaded couplings have gaskets that
seal the connection. To reduce loss of air pressure and/or premature abrasive wear replace these
gaskets when leaks are found. Inspect the couplings daily for leaks and wear. Replace gaskets
when visible wear or leaks are found. When installing or replacing hose couplings cut the hose
end square for secure fit (see Figure 8.3). To ensure proper coupling connection always use
fittings that are the same brand. See the drawings and part lists in Section 9.0.
Figure 8.3 – Hose End Fit up
8.9. Blast Nozzle: Remove the blast nozzle daily and check the jacket and thread condition. Check
nozzle throat diameter. An over-sized throat diameter reduces blast efficiency. Replace the blast
nozzle if worn or damaged.
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