GE EVT-Pro 2.0, Operation And Technical Manual, Page: 7 / 60

SECTION 2
EVT PRO 2.0
®
PRECAUTIONS
Keep this EVT PRO 2.0
®
operations and instruction manual available at all
times.
Observe and comply with recognized safety measures and obligatory
regulations regarding accident prevention and environmental protection.
Consider additional factors including, but not limited to, organization of
work, plant production schedule, and use of additional qualified personnel
when using the EVT PRO 2.0
®
.
Inspect the EVT PRO 2.0
®
periodically during operation to ensure safe
operation and accurate test results.
The EVT PRO 2.0
®
system contains two batteries. One supplies power to
the laptop (actually 2 batteries in one), and the other supplies power to the
pump assembly electronics. The average battery life of both batteries is
eight (8) hours of continuous use or 300 tests @ 15 min each. Be advised
that extreme heat or cold could degrade battery life. Use common sense
when testing with the EVT PRO 2.0
® – if the environmental conditions are
unsuitable for personal to work, then the conditions are unsuitable for use
of the EVT PRO 2.0
®
also. Only trained and certified valve technicians
should use the EVT PRO 2.0
®
Always wear appropriate PPE when using the EVT PRO 2.0
®
.
Do NOT use the EVT PRO 2.0
®
during periods of inclement weather, i.e.,
dense fog, rain, sleet, slow, etc. Immediately abort the use of the EVT
PRO 2.0
®
if lightning occurs.
EVT PRO 2.0
®
Operations and Technical Manual (Rev 1.0
– 2016)
NOT FOR COPY OR DISTRIBUTION Page 3
DANGERS OF TESTING BELOW 50% OR ABOVE 90% OF SET PRESSURE
GE policy has always been to NOT conduct EVT testing below 50% or above 90% of set
pressure.
When testing below 50% of set pressure 2 negative possibilities exist:
• Potential for mechanical damage can occur as a result of too much hydraulic
force required to lift the spindle. (ASME recommends 75% inlet pressure).
• Inaccurate set point determined due to the large gap between inlet pressure and
set pressure. Set point accuracy improves as the gap between inlet pressure
and set pressure decreases.
When testing above 90% of set pressure, 3 negative possibilities exist:
• PRV goes full open as a result of pulling on spindle.
• Damage to equipment occurs as a result of sudden opening of the PRV.
• Safety of technicians is compromised due to sudden opening of PRV.