PROTEGO Braunschweiger Flammenfilter GmbH
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1 PROTEGO Braunschweiger Flammenfilter GmbH Venting of atmospheric and low-pressure storage tanks ISO 28300/API 2000 Simon Maier Regional Manger Europe
2 Agenda 1 Why conservation vents do not function as Flame Arresters 2 Emission Reduction through breathing loss minimization 3 Storage Tanks with Pressure / Vacuum Relief Valves and Flame Arresters Braunschweiger Flammenfilter GmbH 2
3 International Standard: Venting of atmospheric and low-pressure storage tanks ISO API th edition ISO Petroleum, petrochemical and natural gas industries Venting of atmospheric and low-pressure storage tanks EN Annex L TRbF 20 API th /7 th edition
4 Background and development of ISO Standard ISO was mainly developed based on the API 2000 standard th Edition, the EN Standard Annex L and the German TRbF 20 Contradiction towards the venting requirements for normal venting Contradiction towards the use of vents as flame arresters Committee goal: This standard shall consider all state of the art knowledge concerning tank venting and safety and provide best practice to the user
5 Why conservation vents do not function as flame arresters: API th Edition 1998 (old version not valid any more): A flame arrester is not considered necessary for use in conjunction with a pressure vacuum valve venting to atmosphere because flame speeds are less than vapor velocities across the seat of the pressure vacuum valve TRbF 20 (German standard): Clearly calls for flame arresters for tanks that contain liquids that explosive atmosphere can create an Factory Mutual (Insurance and approval company) Requires installation of flame arresters on tanks which store liquids with a flash point at or below 43 C or on tanks which heat the stored liquid to its flash point
6 Conclusion for ISO committee regarding atmospheric explosion protection of storage tanks: Research work is needed due to contradicting standards and opinions ISO shall apply as test standard Two types of test are needed: A) atmospheric deflagration test B) continuous burn test
7 Atmospheric Deflagration - Test set-up 1 ignition source 2 plastic bag Ø 1,2 m, length 2,5m foil thickness >0,05 mm 3 conservation vent 4 explosion proof container 5 mixture inlet with shut-off valve 6 mixture outlet 7 bursting diaphragm atmospheric deflagration test of end-of-line flame arrester as described in ISO part
8
9 High Velocity Burning - Test set-up 1 continuous flame 2 pressure vacuum valve 3 explosion proof container 4 mixture inlet 5 bursting diaphragm 7 pilot flame 10 shut-off valve atmospheric deflagration test of end-of-line flame arrester as described in ISO part 9.2.
10
11 Example Methanol: (ignitable temperature range is within normal storage conditions) Vapor pressure: 30 kpa LFL: 5.5 vol% UFL: 26.5 vol% Explosion hazard of Methanol 40 Vapor Concentration in Vol.% UFL = 26.5 LFL = 5.5 Ignitable Temperature Range Temperature of Liquid Methanol in degree Celcisus
12 Recommendation of ISO regarding explosion prevention: Different tank selection Inert gas blanketing Flame arresters Pressure vacuum valves: Testing has demonstrated that a flame can propagate through a pressure vacuum valve and into the vapour space of the tank. Tests have shown that ignition of a PV's relief stream (possibly due to a lighting strike) can result in a flash back to the PV with enough overpressure to lift the vacuum pallet causing the flame to enter the tank's vapour space. Other tests have shown that under low flow conditions a flame can propagate though the pressure side of the PV,..
13 Emission Reduction through breathing loss minimization (VDI 3479*) The Function of the P/V Vent is to keep the vapor space closed during variations in the atmospheric pressure and/or temperature decrease in spite of pertinent changes of gas volume and pressure, until that time when a technically admissible low or high pressure is reached Goal: avoid intake of ambient air and discharge of product/air mixture * Forschungsbericht 225 Kohlenwasserstoff Emissionen aus Festdachtanks Vergleich von Berechnungsformeln unter besonderer Berücksichtigung der VDI Richtlinie 3479, Hamburg, February 1985
14 Main influence factor of emission reduction for hydrocarbon vapors a) Upper and lower set pressure of vents (set pressure & set vacuum) b) Temperature difference within the vapor space of the tank c) Hydrocarbon concentration of the hydrocarbon/air mixture in the vapor space (vapor pressure)
15 PVRV 100% vs. 10% Lift Tech. Vent valves in acc. to API Standard 2000 with 100% overpressure 20 mbar Opening pressure Vent Valves with 10% Technology difference from set pressure (Start open) to opening pressure (full open) Valve set pressure to be adjusted 10 mbar 18 mbar
16 Set Pressure and Vacuum needs to be influenced MAWP (design pressure)
17 PROTEGO 10% Technology Difference between Full lift and proportional pallet Function with lifting cover Function without lifting cover Braunschweiger Flammenfilter GmbH 17
18 Design Problem with 100 % overpressure Technology MAWP V Required flow P close 100% P set 100% pressure P close PROTEGO 10% P set N2 blanketing P set PROTEGO 10% Braunschweiger Flammenfilter GmbH 18
19 10% vs. 100% Technology Operating Starting Blow Full flow down to range open 0 to to 5.0 WC +4.5 WC +3.1 WC 2 8 Operating Starting Blow Full down to flow range open 0 to to +2.5 WC 5.0 WC +1.8 WC inches of WC inches of WC 10% 100%
20 Calculation Example Fixed Roof Tank with Pressure/Vacuum Vents Emission Massflow (t/yr) and % of Emission Reduction % % % % % 2 40% 3 10% 4 0%
21 Safe protection of storage tanks with Pressure / Vacuum Relief Valves and Flame Arresters
22 Who knows such an installation?
23 Many traditional configurations are a safety risk ISO requires both flow and flame transmission testing of Pressure Vacuum Relief Valves combined with Flame Arresters but lots of Pressure Vacuum Relief Valves combined with Flame Arresters are not fully tested!
24 Many traditional configurations are a safety risk At subsonic flow small pressure losses can impact the lift of a valve pallet quite severely. An increase in the accumulation from set pressure till full-lift is likely.
25 Many traditional configurations are a safety risk Placing a Flame Arrester below the Pressure Vacuum Relief Valve leads to: Additional risk of clogging and hence storage tank collapse May not be safe if explosions or endurance burning occurs Flame Arrester element cannot be serviced without losing explosion mitigation effect Difficult and lengthy maintenance procedure particularly with larger sizes
26 Many traditional configurations are a safety risk Combining a Flame Arrester with a Pressure Vacuum Relief Valve can lead to reduced flow or even severe chattering in high flow relief scenarios when protection is needed most.
27 Chattering of combined valve with flame arrester Braunschweiger Flammenfilter GmbH 27
28 Combined valve with flame arrester Braunschweiger Flammenfilter GmbH 28
29 Thank you for the opportunity to present Excellence in Safety and Evironment
30 Back up Braunschweiger Flammenfilter GmbH 30
31 Emission reduction with PROTEGO Over-/Underpressure- Relief Valves Possible minimum leakage rates (examples) Flange connection Protego Standard ISO / API th edition over up to bubbles per min cm³/min m³/h bubbles per min cm³/min m³/h ,5 0, ,6 0, ,9 0, ,6 0, ,2 0, ,6 0, ,5 0, ,0 0, ,1 0, ,0 0, ,4 0, ,0 0, ,0 0, ,0 0, ,6 0, ,0 0, ,2 0, ,0 0, ,8 0, ,0 0, ,4 0, ,0 0,56628 at 90% set pressure at 75% set pressure
32 PROTEGO - Germany TÜV-Certified Flow Test Rig
33 Flow testing of vents according to API 2000/ISO (TÜV Certified Flow Rig) 1. test medium supply (e.g. blower or fan) 2. calibrated flow measurement device 3. test tank 4. calibrated measuring device for pressure and vacuum 5. (pressure and vacuum measurement may be achieved with separate instruments) 6. temperature measuring device 7. barometer - measuring device for atmospheric pressure 8. device to be tested 9. pipe-away if fitted 10.atmospheric temperature and dew point measuring device 11.L = length of connecting pipe (straight pipe nipple)
34 Emission per cycle (opening to reseating) overpressure set pressure mass (opening) mass (reseating) total mass total volume mbar kg kg kg m³ full lift 10% 20 0,08 0,32 0,40 0,5 modulated 40% 14 0,51 0,66 1,17 1,4 modulated 100% 11 2,31 1,08 3,39 4,1 3,50 3,00 2,50 2,00 1,50 reseating opening 1,00 0,50 0,00 10% 40% 100%
35 Opening pressure versus closing pressure (by using 10% technology) Pset,PV = 14,9 mbarg Popen,PV = 16,4 mbarg Pset,N2 = 10,4 mbarg Pclose,PV = 11,3 mbarg Pset,ERV = 18,2 mbarg Popen,ERV = 20,0 mbarg Pclose,ERV = 13,5 mbarg Example: API 650 / EN Tank with a design pressure of +20 mbarg
36 Opening pressure versus closing pressure (by using 100% technology) Pset,PV = 3,8 mbarg Popen,PV = 7,6 mbarg Pset,N2 = 2,6 mbarg Pclose,PV = 3,1 mbarg Pset,ERV = 10,0 mbarg Popen,ERV = 20,0 mbarg Pclose,ERV = 8,0 mbarg Example: API 650 / EN Tank with a design pressure of +20 mbarg
37
38 Blow Down needs to be considered when sizing p set = d F A = π F d 4 2 d < D p reseat D = F A = π F D 4 2 p > p set reseat
39 Benchmark Report on Vents (leak rate)
40 Areas where End-of-Line Endurance Burning is likely to occur
41 The Challenge of Designing Endurance Burning Flame Arresters vapour liquid outbreathing of explosive gas/air mixture end of line deflagration flame arrester explosive mixture filling line burning of explosive ignited gas/air mixture Endurance Burning: maximum thermal stress considering 2 heat transfer mechanisms burning situation (convection problem period 1) no burning situation (conduction problem period 2) flame arrester
42 The Challenge of Designing Endurance Burning Flame Arresters Convective Time Period (vapor flow cooling the filter element is present) Conductive Time Period ( no cooling through vapor flow)
43 Temperature Curve for a Successful Endurance Burning Test Endurance Burning: 120min no flame transmission red: combustion side blue: protected side black: protected side Test Gas: Ethylene (NEC Group C Vapor) Temperature rise during conductive periode
44 Case 1: Endurance Burning Tested End of Line Arrester applied with a P/V Vent Enclosing heat from P/V Vent lead to failure Endurance Burning: flame transmission after 9 min red: combustion side blue: protected side black: protected side Test Gas: Hexane (NFPA Group D Vapor)
45 Case 2: Endurance Burning Tested End of Line Arrester applied with Goose Neck Endurance Burning: flame transmission after 16 min red: combustion side green: protected side Test Gas: Hexane (NFPA Group D Vapor)
46 Factory Mutual Research Approval Guide
47 Important Demands from Test Standards like FM and European Test Standard ISO 16852, EN to Assure Chemical Plant Safety 1. Flame Arrester Companies have to be Audited to assure Quality Production 2. Live Field Tests are documented in Test Report which Shows Exact Test Conditions (c, p, T) 3. Arresters should only be installed according to Test conditions 4. Be aware what is written in the Standards
48 Design Considerations to lower the likelihood of misapplication 1. Arrester has to be Safe Goal can be achieved if arrester is tested according to ISO 16852, EN or FM standard 2. Misapplication has to be avoided Approval report should be requested from Vendor End Of Line Arrester should only have 1 Flange 3. Easy Maintenance has to be assured Goal can be achieved with hingeable Weather hood Flame arrester Elements should be easily accessible
49 Design solutions with a positive track record Investigation of main application failures proved by life field testing of endurance burning tested end of line flame arresters Often typical misapplication for Endurance Burning Protection: Heat trapped above arrester results in flashback! Test and Application Standards (EN 12874, ISO 16852, FM) Demand to apply only tested configurations Solution:Combination conservation vent/deflagration arrester with hinged weather-hood for endurance burning
50 Where Do My Storage Tank Losses Come From? Storage Tanks Have to Breath
51 Why Does A Quality Product Result in Vapor Saving?
52 Leak rate testing according to API 2521 API calls for leak rate testing at 75% of set pressure
53 1 Leak rate testing results company Groth A Leak rate [scfh] PROTECTOSEAL company B PROTEGO PROTEGO 10% 75 % to set (0.5 oz/sqinch) 75 % to set (0.65 oz/sqinch) Point of full open Tank Pressure oz/sq inch PROTEGO 6" PROTEGO 10% 6"
54 Avoid secondary damage from leaking!
55 Reduce your Explosion Risk from Leaking!
56 Leak rate testing according to API 2521 API calls for leak rate testing at 75% of set pressure
StocExpo Conference 2013, Antwerp. Dipl.-Ing. Axel Sommer Braunschweiger Flammenfilter GmbH (PROTEGO)
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