DVC6000 SIS Solution - 02/01/08 @ 1437

Safety Instrumented System (SIS) Solutions

The operation of many industrial processes involves inherent risk. Instrumented Protection Systems are specifically designed to reduce the severity of the impact of an emergency event. These systems, such as Safety Instrumented Systems (SIS) and others, are designed to monitor a process for potentially dangerous conditions. During an emergency event, the SIS activates the valve to move the process to a safe state.

What happens if the valve does not move when an emergency event occurs? Personnel safety, equipment damage, and environmental protection could be at serious risk.

Traditionally, a pneumatic test panel located near the valve provides a means to exercise the valve to ensure operation when called upon. However the procedures to test the valves are labor-intensive, cumbersome, and may require the valve to be locked in a fixed position or bypassed.

FIELDVUE^� digital valve controllers installed on emergency shutdown valves offer state-of-the-art testing methods. Using HART^� communication, the model 375 Field Communicator or AMS^� ValveLink^� software replace the function of the pneumatic test panel to verify operation of the emergency shutdown valve. The results are improved system performance and valve diagnostic capability along with a reduction in testing time and initial investment cost.

Partial stroke testing – This test checks for valve movement without fully stroking the valve. Many applications will allow 5% movements to verify valve response without upsetting the critical process line. Diagnostic data is collected and an alert is given if the valve is stuck.
Step response test – This test analyzes overshoot, hysteresis, dead time, and stroking time.
Valve signature test – This test can be used to benchmark valve performance by identifying friction, spring rate, seating forces and bench set.
Automatic testing – A scheduling and batch running tool within AMS ValveLink software can be used to automate multiple diagnostic tests.

Literature:

TUV Documents:	Product Information:
Certificate & report	DVC6000 SIS Sales Brochure
FMEDA Reports:	DVC6000 SIS Technical Bulletin
DVC6000 SIS	HART Loop Interface & Monitor (HIM)
LC340 Line Conditioner	Manuals:
Training Courses:	DVC6000 Instruction Manual
SIS Course 1	LCP100 (Local Control Panel) Instruction Manual
SIS Course 2	LC340 Line Conditioner Instruction Manual
	Miscellaneous:
	FIELDVUE DVC6000 SIS advertisement

Published Papers:

Predicting Health of Final Control Element of Safety Instrumented System by Digital Valve Controller	Presented at ISA AUTOMATION WEST, Copyright 2004, ISA-The Instrumentation, Systems and Automation Society. Posted with permission. All rights reserved.
Smart Positioners to Predict Health of ESD Valves	59th Annual Instrumentation Symposium for the Process Industries, Texas A&M University, January 2004
Smart Positioners in Safety Instrumented Systems	"PTQ" Petroleum Technology Quarterly, April 2003
ESD Proof of Performance Goes Digital	Control & Instrumentation, November 2000