Welcome to the LESER Seminar, Taipei 28. June 2006 1
Design of safety relief valves 2
Design of safety valves Target Classification of Pressure Relief Devices General design of Safety Relief valves 3
Design of safety valves Classification according to ASME PTC Pressure Relief 25 Device (PRD) Reclosing Pressure Relief Device Nonreclosing Pressure Relief Device Pressure relief valve (PRV) Low lift PRV Full lift PRV Pilot operated PRV Power actuated PRV Rupture disc device Buckling pin device Bursting disc device Safety valve Relief valve Safety relief valve (SRV) 4
Pilot operated safety valve vs. spring loaded safety valve Spring loaded Pilot operated 5
Flanged connection Basic design of safety valves Standard connections Threaded connection Type 441 Type 526 Type 437 Type 459 6
Inlet female connection Basic design of safety valves Special connections Welded end Typical for threaded valves Large spread of connections 7
Basic design of safety valves Nozzle type Semi nozzle Type 441 ANSI Full nozzle Type 526 Seat (semi nozzle) Mechanically rolled seat to the body Recognized design in general industry application Nozzle Threaded nozzle Recognized design in API applications 8
Basic design of safety valves Blow-down ring Type 441 without blow-down ring Type 526 with blow-down ring Blown-down ring Codes and standards which don t require a blow-down ring like ASME VIII Codes and standards which require a blow-down ring like API 526 9
Type 526 with bellows Basic design of safety valves Bellows Type 526 without bellows Bellows Protection of inner parts Back pressure compensation Back pressure lower than 15% 10
Open bonnet Basic design of safety valves Bonnet Closed bonnet Spring cooled by atmosphere Completely sealed safety valve 11
Type 526 plain lever H3 Basic design of safety valves Cap vs. lifting device Type 526 lifting device H4 No gastight Gastight manual lifting possible 12
Type 526 bolted cap H1 Basic design of safety valves Bolted vs. standard Type 526 cap H2 Only if specification demands Standard at LESER valves 13
Type 526 metal seat Basic design of safety valves Sealing Type 526 Soft seal (O-ring) Used in standard application For improved requirements, but limited by temperature and chemical resistance 14
Basic design of safety valves Threaded valve type Type 437 two-piece assembly Type 459 three-piece assembly Inlet body Outlet body Inlet body Outlet body Bonnet 15
Lift indicator open Basic design of safety valves Lift indicator Lift indicator closed Control room Lift Control room Indication of valve lift to control room 16
Safety valve in use Basic design of safety valves Test gag Blocked for revision The safety valve has to be gagged to perform a pressure test of the plant, otherwise the valve has to be removed or a blind has to be installed before 17
Without drain hole Basic design of safety valves Drain hole With drain hole Condensed liquid is removed from the body either by free draining design or if desired by additional drain hole 18
Without heating jacket Basic design of safety valves Heating jacket With heating jacket In situations with media with a lowreynolds number (highly viscous fluids) a heating jacket with heated spacer ensures the proper function of a safety valve Furthermore it avoids clogging of the safety valve 19
Product range 20
Overview API Series Type 526 High Performance Type 441 Compact Performance Type 437 Clean Service Type 48X Compact Performance Type 459 Critical Service Type 447 21
API Series Series 526 22
API Series Series 526 Features From To NPS 1 8 Pressure rating #150 #2500 Set pressure range [psig] 15 6000 Orifice D T Body material WCB, WC6, CF8M 23
API Series Series 526 24
API 526 Applications Large scale chemical plant Tank protection Blow-down systems Oil extraction, transport and processing Drilling platforms Oilfields ( Christmas trees ) Storage tank facilities Refineries NACE applications (e.g., sour gas) Pipelines OEM equipment in petrochemical plants 25
Compact Performance Threaded Safety Relief Valves Series 437, Series 459 26
Compact Performance Threaded Safety Relief Valves Series 437, Series 459 Features From To Nominal Pipe Size (NPS), inlet Inlet thread DN ANSI NPT G 15 ½ ½ 25 1 2 Pressure rating DIN [PN] 16 ANSI [PR] #150 700 #2500 Set pressure range DIN [bar] ANSI [psig] 0.2 15 700 10150 Connection Large variety of connections 27
Compact Performance Applications Air/gas compressors and pumps Technical gases and CO2 plants Chemical equipment and piping Pressure vessels and piping systems containing gas, air, liquid or steam LPG/LNG terminals, carriers etc. Cryogenic systems and oxygen application Thermal Relief 28
High Performance Flanged Safety Relief Valves Series 441 DIN, ANSI, XXL 29
High Performance Flanged Safety Relief Valves Series 441 DIN, ANSI, XXL Features From To Nominal Pipe Size (NPS), inlet DN ANSI 20 ¾ 400 16 Pressure rating DIN [PN] 10 ANSI [PR] #150 40 #300 Set pressure range DIN [bar] ANSI [psig] 0.2 15 40 580 Connection Flanged connections 30
High Performance Applications Gas/air separation plants Large mass flow High accumulation rates Liquids at large mass flow High pressure pumps Chemical reactors Power stations Liquid gases Natural gas services Boilers 31
Clean Service Safety Relief Valves for clean service applications: Series 48X 32
Clean Service Safety Relief Valves for clean service applications: Series 48X Features From To Nominal Pipe Size (NPS), inlet DN ANSI 10 ½ 100 4 Pressure rating DIN [PN] 16 ANSI [PR] #150 16 #150 Set pressure range DIN [bar] ANSI [psig] 0.1 15 16 2175 Connection Large variety of connections 33
Clean Service Applications Food industry Dairy Brewery Pharmaceutical industry Chemical industry Multi-purpose plants Cosmetic industry 34
Critical Service PTFE-lined Safety Relief Valves: Series 447 35
Critical Service PTFE-lined Safety Relief Valves: Series 447 Features From To Nominal Pipe Size (NPS), inlet DN ANSI 25 1 100 4 Pressure rating DIN [PN] 10 ANSI [PR] #150 40 #150 Set pressure range DIN [bar] ANSI [psig] 0.15 15 16 232 Option Type 447: fully lined Type 546: PTFE-nozzle 36
Critical Service Application Chlorine manufacture Reducing acids Alkalis Dump sewage High back pressure (= 50%) and corrosion MDI-plants (Methydiisocyanat) Phosgene plants Multiple product systems 37
Safetyvalves with upstream KUB bursting disc A E C B D A B C D E Safety valve Reverse buckling pin bursting disc Two piece holder (outlet and inlet connection part) Space monitoring device Pressure Gauge 38
Safety valves with upstream KUB bursting disc Features From To Set pressure range DIN [bar] ANSI [psig] 2.0 30 120 1740 Combination of advantages of bursting disc and safety valve Type test approved 39
The End The final curtain 01/29/02 LESER 40