Safety Instrumented Systems (SIS)>ProSafe-RS Terms
Yokogawa ProSafe-RS Terms
BMS
BMS stands for "burner management system."
A BMS functions as an interlock to ensure the safe operation of boilers and combustion facilities in oil and gas plants.
ESD
ESD stands for "emergency shutdown."
An ESD system shuts down a process and restores a safe state when a process value exceeds a preset acceptable level.
Explosion Protection Standards
Explosion protection standards concern the safe installation of equipment in areas where any ignition source can cause an explosion.
Standards vary in each country so it is necessary to check in advance where the equipment will be installed to determine which explosion protection standards and certification requirements apply.
ProSafe-RS is a global product, and is certified to meet the FM Approval Standards in the US and the ATEX type “n” standard (self-declaration) in Europe. ProSafe-RS can be installed in Zone 2 or Division 2 hazardous areas.
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F&G
F&G stands for "fire and gas."
An F&G system activates alarms and fire extinguishing equipment when a fire breaks out.
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Yokogawa ProSafe-RS Terms
Marine Standards
Marine standards set the conditions and performance requirements for the equipment and systems used on ships and offshore floating facilities.
Because they tend to operate in highly isolated locations, offshore floating ships and facilities tend to have higher risks.
The equipment on these vessels are also required to withstand severe vibration, power fluctuations, and other conditions. Accordingly, they must
meet higher performance standards than onshore facilities. ProSafe-RS has been approved by the American Bureau of Shipping (ABS, US),
Lloyd's Register (UK), and Bureau Veritas (BV, France) -- which are the main international marine standards bodies.
We provide the ProSafe-RS system to operators of FPSO facilities and LNG carriers.
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Yokogawa ProSafe-RS Terms
PFD
PFD stands for "probability of failure on demand."
In the case of an SIS, a PFD of 1/1000 means that the system may fail once every 1000 times that it is required to function. In other words,
by installing an SIS, the risk can be reduced to 1/1000.
This has the same meaning as the SIL risk factor. The lower the PFD, the higher the reliability and safety.
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Yokogawa ProSafe-RS Terms
SIS
SIS stands for "safety instrumented system."
An SIS performs specific functions to return a process to a safe state when an unacceptable process condition is detected. An SIS is mainly
used in industrial processes at oil, petrochemical, and natural gas refineries.
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Yokogawa ProSafe-RS Terms
SIL
SIL stands for "safety integrity level."
An SIS has to be evaluated and certified to a certain safety level. SILs are defined by the IEC 61508 and 61511 international safety standards, and
indicate the plant risk factor that can be achieved through the introduction of specific safety measures.
For example, by installing an SIL3 SIS in a plant, the risk factor can be reduced to between 10-3 and 10-4. The risk factors for specific SILs are
given below:
SIL4: ≥ 10-5 to < 10-4
SIL3: ≥ 10-4 to < 10-3
SIL2: ≥ 10-3 to < 10-2
SIL1: ≥ 10-2 to < 10-1
In this way, it is possible to quantitatively and objectively evaluate the safety level when planning to introduce an SIS at a plant.
ProSafe-RS is
SIL3 certified, and this is the maximum SIL that can be achieved by a programmable logic solver.