KROHNE Summit 8800 Vol 2 - Manual (Page 41)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 METERING PRINCIPLES 03
A10 Proving sequence
completed?
A check is made if ‘proving sequence’ was completed successfully, the
‘abort proving’ tag can be monitored.
• No
• Manual abort
• Valve failure
• Communications failure
• Run failure
• Pressure failure
• Temperature failure
• Density failure
• Volume failure
• Deviation during prove
• Turbine failure
• USM failure
A11 User accepts KF/MF? Verification made if user accepts new KF/MF.
The new K-factor and meter factor must be accepted through the
validate results tag via the display or Modbus.
A12 Update KF/MF If the previous step was accepted, then the new KF/MF is updated. The
tags are calculated K and calculated MF.
A13 Generate prove report The proving status tag and other tags are updated.
A14 Reset valves? If the prove is successful the valves will be reset.
If the prove fails the valves will not be reset and will stay in the same
position.
A15 End prove valve control All configured valves are set to the position to finish the prove. If
configured the following valves are set in the following sequence.
1. Set 4-way valve to reverse, only for ball provers;
2. Set prover flow control;
3. Open prover outlet;
4. Open run flow control;
5. Open required run outlet;
6. Close prover inlet;
A16 Valves positioned
correctly?
All configured valves are check if they are in correct position.
A17 Send setpoints to
regulate flow
Send setpoints to regulate flow
A18 Send end prove
command to required
run
The proving.n tag of the required stream is reset.
A19 Prove end The prover general alarm tag is reset.
3 .10 .6 Meter factor and K – factor
After every successful prove process, a flow meter will be assigned a new meter factor (MF) and
K- factor.
K- factor, the number of signal pulses from a meter during a prove divided by the actual cor-
rected prover volume.
K-factor = (meter pulse)/(correct prover volume)
Meter factor, the value obtained by the corrected prover volume divided by the actual liquid vol-
ume passed through the flow meter
MF = (correct prover volume )/(meter registered volume)
Equation 4 KF & MF prover calculation