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Competence in Functional Safety

Functional safety of globe valves, rotary plug valves, ball valves and butterfly valves

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Summary of Contents for 3241

Page 1: ...Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves MANUAL SMART IN FLOW CONTROL...

Page 2: ...NIK LEUSCH PFEIFFER RINGO SAMSOMATIC STARLINE VETEC Founded in 1907 SAMSON has since become a worldwide leader in the manufacture of expertly engineered control valves SAMSON has over 50 subsidiaries...

Page 3: ...ntended use of control valves in safety instrumented systems 10 5 1 General control valve requirements 12 5 2 Globe valve requirements 13 5 3 Ball valve requirements 15 5 4 Butterfly valve requirement...

Page 4: ...ure pmax in psi 12 Symbol indicating fail safe action Actuator stem extends FA Actuator stem retracts FE Manual override 14 Connecting thread 15 Diaphragm material 16 Date of manufacture 7 4 14 15 12...

Page 5: ...perate control valves This manual contains information safety related data and warnings concerning the functional safety in accordance with IEC 61508 and concerning the application in the process indu...

Page 6: ...ue executing the demanded function in case of faults or deviations sd Failure rate for all safe detected failures su Failure rate for all safe undetected failures dd Failure rate for all dangerous det...

Page 7: ...on IEC 61508 Parts 1 to 7 Functional safety of electrical electronic pro grammable electronic safety related systems IEC 61511 Parts 1 to 3 Functional safety Safety instrumented systems for the proces...

Page 8: ...is based on low demand mode of operation i e the frequency of demands on a safety related system is no greater than once per year Safety integrity level SIL PFDavg low demand mode 4 10 5 to 10 4 3 10...

Page 9: ...an be decreased by one if the following requirements are met The device is proven in use Take this into account when selecting devices The device only allows process relevant parameters to be set e g...

Page 10: ...impeded by mechanical equip ment such as travel stops or handwheels under any circumstances When the signal pressure is applied to the actuator again the valve moves to the corre sponding position If...

Page 11: ...discovery of undetected systematic failures VDI 2180 5 section 4 provides special instructions Avoiding systematic failure To avoid systematic failure the user must take into account the following ap...

Page 12: ...9 1 4 DN 6 DN 8 DN 10 DN 4 2 5 DN 4 DN 6 DN 8 6 DN 4 DN 6 Note A larger nominal size is needed when the connection length exceeds 2 m Example Connecting pipe cross sections required for SAMSOMATIC Ty...

Page 13: ...be tightened by qualified staff only to prevent the stem from beco ming blocked To prevent corrosion of the actuator springs measures must be taken to prevent water or moisture from entering the actua...

Page 14: ...r if requested The actual actuator forces must not close the valve against a pressure which is 1 5 times above the nominal pressure PN of the plant or valve If this actuator force restriction cannot b...

Page 15: ...tions for a ball valve Media especially degreasing swelling and fibrous media may affect the torque The operating conditions e g switching interval and the medium temperature have an effect on the tor...

Page 16: ...in relation to the differential pressure and the permissible torque of the butterfly valve shaft must be observed Manufacturer Nominal size Perm torque Mdmax Nm Perm torque Mdl in Nm at a differential...

Page 17: ...on the torques The mounting of the valve and actuator is of vital importance The permissible torques for the butterfly valve shaft shaft adapter and bridge have been verified by the manufacturer As a...

Page 18: ...nce The permissible torques for the valve shaft shaft adapter and bridge have been verified by the manufacturer As a result the max torque of the actuator air or spring torque must not exceed these to...

Page 19: ...3 1 Particle size and quantity Oil content Pressure dew point Class 4 Class 3 Class 3 5 m and 1000 m 1 mg m 20 C or at least 10 K below the lowest ambient tem perature to be expected The required mini...

Page 20: ...sures must be observed Prior to start up the voltage must be checked to ensure that it meets the permissible range Prior to start up the necessary verifications verification of intrinsic safety must b...

Page 21: ...ounting position of the control valve complies with the manufacturer s specifications operating instructions The devices used must be checked to ensure they are suitable for use under the prevailing a...

Page 22: ...ations Series 240 und 250 Globe Valves with Type 3271 and 3277 Pneumatic Actuators valve manufacturer SAMSON AG Type LTR43 Butterfly Valve with actuator valve manufacturer LEUSCH GmbH Industriearmatur...

Page 23: ...23 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves...

Page 24: ...24 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves...

Page 25: ...25 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves 0...

Page 26: ...26 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves 0...

Page 27: ...27 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves 0...

Page 28: ...28 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves 0...

Page 29: ...29 Competence in Functional Safety Functional safety of globe valves rotary plug valves ball valves and butterfly valves...

Page 30: ...he actuator move smoothly to its operating position when the signal pressure is applied Is there any leakage at the actuator Does the actuator move smoothly to its fail safe position when moved by the...

Page 31: ...on is necessary Obtain a permit to work Wear suitable protection for the work Observe explosion protection regulations The person performing the work is responsible for using the appropriate maintenan...

Page 32: ...SELLSCHAFT Weismuellerstrasse 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 E mail samson samson de Internet www samson de 2017 01 WA 236 EN Competence in Functional Safety...

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