Flowserve Limitorque MX User Manual

Limitorque MX Electronic Actuator FCD LMENIM2350-02 A4 – 05/16
2
FLOWSERVE PROPRIETARY INFORMATION
Use or disclosure of this information is subject to the restrictions on the title page of this document
Contents
1 Scope 5
1.1 System Overview 6
2 Safety Integrity Level [SIL] 7
2.1 Failure Rates/Failure Modes 7
2.1.1 Safe, but Detected (λ
SD
) 7
2.1.2 Safe, but Undetected (λ
SU
) 7
2.1.3 Dangerous, but Detected (λ
DD
) 7
2.1.4 Dangerous, but Undetected (λ
DU
) 7
2.2 Mission Time (Tmission) 7
2.3 Partial Stroke Test Period 7
2.4 Proof Test Period (Tpt) 8
2.5 FIT 8
2.6 Mean Time to Restoration (MTTR) 8
2.7 SFF 8
2.8 PFD
avg
8
2.9 RRF 8
2.10 SIL vs. PFD
avg
vs. RFF 8
3 Safety Requirements 9
3.1 Monitor Relay Annunciation 9
3.2 Local Control Knobs Sensors 9
3.3 ESD Override for Knobs 9
3.4 The LCD Display May Also Indicate Warnings and Alarms 9
3.5 Partial Stroke Test Interval 9
3.6 Proof Test Interval 10
3.7 Basic Safety Configuration Requirements 10
3.8 Optional Emergency Overrides 10
3.9 Labeling 10
4 Design for Safety 11
4.1 LimiGard™ 12
4.2 Optional Safety Add-ons 12
4.2.1 Fire Protection 12
4.2.2 Safety Critical User Wiring 13
5 Limitorque MXa Safety Functions 14
5.1 Emergency Shutdown Open (ESD-Open) 14
5.2 Emergency Shutdown Close (ESD-Close) 14
5.3 Emergency Shutdown ‘Move To’ (ESD-Position) 14
5.4 Emergency Shutdown Stop (ESD-Stop) 14
5.5 Emergency Shutdown Ignore (ESD-Ignore) 14
5.6 Fail No-Action (Stay Put) Operation 15
5.7 Multiple ESD Functions for Basic PST 15
6 MXa Safety 16
6.1 PFDavg for MXa Actuator without PST 16
6.2 PFDavg for MXa Acutator with Monthly PST 17
7 Partial Stroke Testing [PST] 18
7.1 Basic PST Description 18
7.2 Enhanced PST Description 18
7.2.1 Monitor Relay Behavior When Configured as Enhanced PST 19

Flowserve Limitorque MX Specifications

General

Brand	Flowserve
Model	Limitorque MX
Category	Controller
Language	English