Schmidt AmphiBlast 120, Operation And Maintenance Manual

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Copyright © 2019 Axxiom Manufacturing, Inc.
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 insure 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(s): 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.
8.10. Valves: Thompson® Valves, Automatic air valves, control valves, and deadman valves should
be disassembled and inspected quarterly, or more frequently if heavily used. Ball valves should
open and close without difficulty and should not leak air. Repair or replace any component that
shows signs of wear or damage. The Thompson Valve cylinder should be cleaned and
lubricated with an anti-seize compound. Replace parts as needed with Schmidt® original
factory replacement parts furnished by an authorized Schmidt distributor. Periodically check if
air is leaking from end of blast nozzle when the blast operation is off. A worn Thompson Valve
seat usually causes this. It is replaced by removing the four bolts in the base of the valve to
allow disassembly. Refer to valve drawings in Section 9.0.
Depressurize vessel before performing any maintenance. See Section 6.2. Removing the
Thompson valve bolts with the abrasive blaster pressurized will result in serious injury or death.
Use of replacement components that are not Schmidt® original factory replacement parts may
result in equipment failure which can result in serious personal injury.