AXXIOM Manufacturing, Inc. SCHMIDT, Operation And Maintenance Manual, Page: 22 / 60

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© 2013 Axxiom Manufacturing, Inc.
3.11 Pressure Relief Valve Installation
Do Not operate this equipment without a pressure relief device installed to protect the blaster
pressure vessel from over-pressurization. The ASME Code requires that all vessels be operated
with pressure relief devices in place.
If the compressed air system does not provide for the installation of a pressure relief valve one
can be installed on the blowdown port on the pressure vessel. Refer to Figure 3.11 for an
alternate location of the air pressure relief valve.
Local regulations set the specifications for pressure relief valves; therefore, it is the
responsibility of the owner of the abrasive blaster to install a pressure relief valve that meets
all
applicable regulations. The pressure relief device must be set at the maximum allowable
working pressure of the abrasive blaster pressure vessel See the ASME/CE vessel nameplates
attached to the pressure vessel.
Rupture Hazard. Operating the pressure vessel above the maximum allowable working pressure
can result in rupturing the pressure vessel. Install an air pressure relief valve to protect against
over pressurization of the blast vessel.
Airborne particles and loud noise hazards from relief valve exhaust air can cause serious injury
and loss of hearing. Wear approved eye and ear protection. Stay clear of exhaust air path. DO
NOT place hands or other body parts in the exhaust air path. Make sure no personnel are in the
exhaust air path. Direct the relief valve exhaust away from work area.
Figure 3.11 – Suggested location for air pressure relief valve