SI057001_MNL - Gasoline Overfill Protection SIS IMMEAS-SIS1 Design Manual

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Immingham East Terminal – Gasoline Overfill Protection
Safety Instrument System
P & I Design Ltd DOCUMENT NO: SI277001_RPT
2 Reed Street, Thornaby, UK, TS17 7AF ISSUE: F DATE: 31.10.14
Tel: + 44 (0)1642 617444 PAGE 24 OF 29
Fax: + 44 (0)1642 616447
7.2.3.5 Overall System Summary
System PFD = Sensor Sub-System PFD+Logic Solver PFD+Final Element Sub-System PFD
System PFD = (2.48 x 10-4) + (4.0 x 10-6) + (2.04 x 10-3)
System PFD = 2.3 x 10-3
System Checks – each sub-system individually satisfies the requirements of > SIL 2 together
with the combined PFD of 2.3 x 10-3 providing a combined > SIL 2.
7.2.3.6 PFD System Calculations – Spreadsheet Programme
P & I Design Ltd Probability of Failure on Demand (PFD) Summary
Version 5.6
Originator:
Checked:
Approved:
Issue:
Date:
2
Valid
PFD(SYS) =
2.30E-03 = 2.48E-04 Valid 4.00E-06 Valid 1.02E-06 Valid
0.00E+00 n/a 0.00E+00 n/a 7.09E-04 Valid
0.00E+00 n/a 0.00E+00 n/a 1.33E-03 Valid
Valid 2.48E-04 Valid 4.00E-06 Valid 2.04E-03 Valid
S.Trip(SYS) =
50.5 = 192 Years 13158 Years 5051 Years
Years n/a Years n/a Years 278 Years
n/a Years n/a Years 93 Years
DRR
C
24/02/2011
SAFETY INTEGRITY LEVEL REQUIRED
No.4 East Tanks
SI277001.CAL
Client Ref:
PFD(FE) PFD(S) PFD(L)
CALCULATION SUMMARY
SAFETY INTEGRITY LEVEL ACHIEVED
S.Trip(S) S.Trip(L) S.Trip(FE)
SPURIOUS TRIP SUMMARY
Client:
Project: PP
DRR
Immingham East
Simon Storage
Document:
SIS Number: