Spirax Sarco LC3050 Instrucciones De Instalación Y Mantenimiento página 7

used to avoid systematic failures introduced during the lifecycle and the control of failures during
operation.
A Failure Mode Effects and Diagnostics Analysis (FMEDA) has been carried out as part of this
assessment and has established the failure modes and random failure rates for the LC3050.
According to BS EN 61508-2:2010 route 1
that may be claimed. The failure data source was 'Reliability, Maintainability and Risk', 6
by Dr David J. Smith.
The results are summarised below in Tables 1 and 2:
Table 1 – Low Demand Mode, 1oo1 architecture
Safety
λ
DU
function
-6
x 10
/hr
Low
water
0.174
level
detection
Diagnostic coverage may be calculated, using the figures of Table 1, to be 87% for dangerous
failures and 99% for safe failures.
Table 2 – High Demand Continuous Mode, 1oo1 architecture
Safety
λ
DU
function
-6
x 10
/hr
Low
water
0.174
level
detection
IM-P402-131 AB Issue 8
H
λ λ λ
DD SU SD
-6 -6 -6
x 10 x 10 x 10
/hr /hr /hr
1.196 0.179 267
λ λ λ
DD SU SD
-6 -6 -6
x 10 x 10 x 10
/hr /hr /hr
1.196 0.179 267
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was used to determine the maximum safety integrity
No t
λ
CE
TOTAL
effect
-6
x 10
-6
x 10
/hr
/hr
1.569 270 564
No
λ
TOTAL
effect
-6
x 10
-6
x 10
/hr
/hr
1.569 270
Version 6
th
Edition
SFF PFD
AVG
99.9% 0.0008
SFF PFH
G
-7
99.9% 1.74x10
Ltd
7