Relief Valves; Electrical; Guards - Quincy Compressor QSI Series Instruction Manual

Section III - Installation

Relief Valves

Pressure relief valves are sized to protect the system.
Never change the pressure setting or tamper with the
valve. Only the relief valve manufacturer or an approved
representative is qualified to make such a change.
DANGER!
Relief valves are to protect system integrity in
accordance with ANSI/ASME B19 safety
standards. Failure to provide properly sized relief
valves will result in death or serious injury.
Relief valves are to be placed ahead of any potential
blockage point that includes, but is not limited to, such
components as shut-off valves, heat exchangers and
discharge silencers. Ideally, the relief valve should be
threaded directly into the pressure point it is sensing, not
connected with tubing or pipe and pointed away from any
personnel. Always direct discharge from relief valves to
a safe area away from personnel.
Figure 3-1. Relief Valve
CAUTION!
ASME coded pressure vessels must not be
modified, welded, repaired, reworked or
subjected to operating conditions outside the
nameplate ratings. Such actions will negate code
status, affect insurance status and may cause
death, serious injury and property damage.
14

Electrical

Before installation, the electrical supply should be
checked for adequate wire size and capacity. During
installation, a suitable fused disconnect switch or circuit
breaker should be provided. Any unreasonable voltage
unbalance (5%) between the legs must be eliminated and
any low voltage corrected to prevent excessive current
draw. The installation, electric motor, wiring and all
electrical controls must be in accordance with National
Electric Code, and all state and local codes. A qualified
electrician should perform all electrical work. Air
compressors must be grounded in accordance with
applicable codes. See control panel for the proper
wiring diagram.
Quincy would like to emphasize the importance of
providing adequate grounding for air compressors. The
common practice of grounding units to building
structural steel may not actually provide adequate
grounding protection, as paint and corrosion build-up
may exist.
NEMA electrical enclosures and components
must be appropriate to the area in which they
are installed.
Pneumatic Circuit Breakers or Velocity Fuses
The Occupational Safety and Health Act, Section
1926.303 Paragraph 7 published in Code of Federal
Regulations 29 CFR 1920.1 (revised 07/01/1982), states
"all hoses exceeding 1/2" inside diameter shall have a
safety device at the source of supply or branch line to
reduce pressure in case of a hose failure." These
pneumatic safety devices are designed to prevent hoses
from whipping, which could result in a serious or fatal
accident.

Guards

All mechanical action or motion is hazardous in varying
degrees and needs to be guarded. Guarding shall comply
with OSHA Safety and Health Standards 29 CFR
1910.219 in OSHA manual 2206 (revised 11/07/1978)
and any state or local codes.
Quincy Compressor-QSI
CAUTION!
®