KROHNE Summit 8800 Vol 2 - Manual (Page 40)

40 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 METERING PRINCIPLES 03
A04 Begin prove valve
control
All configured valve are set to proper position. If configured the
following valves are set in the following sequence.
1. Set run flow control;
2. Open required run outlet;
3. Open prover outlet;
4. Set prover flow control;
5. Close all run prover inlet;
6. Open required run prover inlet;
7. Close run outlet;
8. Set 4-way valve to reverse, only for ball provers;
9. Start flow control.
Valve status tags can be found in the following location.
A05 Valves correctly
positioned?
All configured valves are check if they are in the proper position with
valve position tag.
1. Idle
2. Opening prover outlet valve
3. Opening prover flow control valve
4. Positioning fourway valve
5. Opening run prover inlet valve
6. Closing run prover inlet valve
7. Opening run flow control valve
8. Opening run outlet valve
9. Closing run outlet valve
10. Start regulating
11. Checking run outlet valves
12. Returning piston
13. Opening master run outlet
14. Closing master run outlet
A06 Flow stabilisation Volume, temperature, and pressure are checked for deviations.
• Minimum stability duration, this is the waiting time before stability
check;
• Maximum stability duration, after this time the conditions must be
stable;
• Stability limit, the maximum limit for the deviation.
A07 Stabilisation completed
successfully?
Check is made if previous steps were successful.
Important: If successful the conditions are recorded and monitored
throughout the proving.
For reference the standard deviation tag for flow, temperature and
pressure can be found under the following location.
There are a set of deviation alarm tags that are set is the standard
deviation is greater than the limit set.
Active>prover>alarms>live>prover pressure-temperature-flow
A08 Proving sequence In this step sub routine proving sequence is initiated. The result of the
sequence can be successful or failed
A09 Multi-point prove? A check is made on how the prover is configured, single point or multi-
point.
If the prover is configured as multi-point proving, then the routine will
go back to step A06 ‘flow stabilisation’ and set the configured flow rate
for each proving point.
If the prover is configured as single point proving, then the routine will
continue to the next step.