Birkett Technical Catalogue - Safety Systems UK Ltd

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Table 2 Representative data on some vapours and gases useful in sizing safety relief valves Gas or Vapour k C C M √M G* √G imperial metric Acetaldehyde 1.14 331 2.51 44 6.633 1.519 1.232 Acetic Acid 1.15 332 2.52 60 7.746 2.071 1.439 Acetylene 1.26 343 2.61 26.04 5.103 0.899 0.948 Air 1.40 356 2.70 28.97 5.382 1 1 Ammonia 1.31 348 2.64 17.03 4.127 0.587 0.766 Argon 1.67 377.5 2.87 40 6.325 1.381 1.175 Benzene 1.12 329 2.50 78.11 8.838 2.70 1.643 Butadiene 1.3 1.12 329 2.50 54.09 7.355 1.922 1.386 n-Butane 1.09 325 2.47 58.12 7.63 2.07 1.439 Iso-Butane 1.1 327 2.49 58.12 7.63 2.07 1.439 i-Butane 1.11 327 2.49 56.10 7.49 1.937 1.392 Iso-Butylene 1.12 329 2.49 56.10 7.49 1.998 1.413 Carbon Dioxide 1.29 346 2.68 44.01 6.634 1.53 1.237 Carbon Disulphate 1.21 338 2.57 76.13 8.726 2.628 1.621 Carbon Monoxide 1.40 356 2.70 28.00 5.292 0.967 0.983 Chloride 1.36 353 2.68 70.91 8.421 2.45 1.565 Cyclohexane 1.09 325 2.47 84.16 9.174 2.905 1.705 Decane 1.03 319 2.42 142 11.92 4.91 2.216 Dowthern A 1.043 320 2.43 165 12.85 5.696 2.386 Dowthern E — — — 147 12.12 5.074 2.253 Ethane 1.19 336 2.55 30.07 5.483 1.05 1.025 Ethene (Ethylene) 1.24 341 2.59 28.05 5.297 0.977 0.988 Ethyl Alcohol 1.13 330 2.50 46.07 6.787 1.59 1.261 Ethyl Benzine 1.07 323 2.46 106.16 10.31 3.67 1.916 Ethyl Chloride 1.19 336 2.55 64.50 8.031 2.226 1.492 Freon 11 1.14 331 2.51 137.37 11.72 4.742 2.177 Freon 12 1.14 331 2.51 120.92 10.995 4.174 2.043 Freon 22 1.18 335 2.55 86.48 9.299 2.985 1.727 Freon 114 1.09 325 2.47 170.93 13.073 5.90 2.429 Helium 1.66 377 2.86 4 2 0.138 0.3716 n-Heptane 1.05 321 2.44 100 10 3.49 1.868 n-Hexane 1.06 322 2.45 86.17 9.283 2.97 1.723 Hydrogen Chloride 1.41 357 2.71 36.47 6.039 1.27 1.127 Hydrogen 1.41 357 2.71 2.02 1.421 0.070 0.265 Hydrogen Sulphide 1.32 349 2.65 34.08 5.838 1.19 1.091 Methane 1.31 348 2.64 16.04 4.005 0.555 0.745 Menthyl Alcochol 1.20 337 2.56 32 5.657 1.11 1.054 Menthyl Butane 1.08 324 2.46 72.15 8.494 2.49 1.578 Methyl Chloride 1.20 337 2.56 50.48 7.105 1.742 1.320 Natural Gas 1.27 344 2.61 19 4.359 0.656 0.8099 Nitric Oxide 1.40 356 2.70 30 5.477 1.036 1.018 Nitrogen 1.40 356 2.70 28.02 5.294 0.967 0.9834 Nitrous Oxide 1.30 347 2.63 44 6.633 1.519 1.233 Nonane 1.04 320 2.43 128 11.31 4.43 2.105 n-Octane 1.05 321 2.44 114.22 10.687 3.94 1.985 Oxygen 1.40 356 2.70 32 5.657 1.10 1.0490 n-Pentane 1.07 323 2.46 72.15 8.494 2.49 1.578 Phenol 1.30 347 2.63 94 9.695 3.27 1.808 Propane 1.13 330 2.50 44.09 6.64 1.55 1.245 Propylene 1.15 332 2.52 42.08 6.487 1.476 1.214 Sulphur Dioxide 1.29 346 2.63 64.06 8.004 2.26 1.503 Steam 1.33 349 2.66 18 4.243 0.622 0.7887 Styrene 1.07 323 2.46 104.14 10.21 3.60 1.897 Toluene 1.09 325 2.47 92 9.592 3.18 1.783 *Air = 1.0 at 14.7 Psia and 60ºF. 85
Table 3 Representative data on liquids useful in sizing safety valves Liquid G** G Acetic Acid 1.05 1.025 Acetone 0.792 0.890 Ammonia 0.617 0.786 Benzene 0.885 0.941 1, 2 Butadiene 0.658 0.811 1, 3 Butadiene 0.627 0.792 Iso-Butane 0.563 0.750 n-Butane 0.584 0.764 j-Butane 0.601 0.775 Carbon Dioxide 0.816 0.903 Carbon Disulphide 1.26 1.122 Chlorine 1.423 1.93 Dowtherm A at 212ºF 0.997 0.999 Dowtherm E at 212ºF 1.181 1.086 Ethane 0.377 0.614 Ethyl Alcohol 0.794 0.891 Ethyl Benene 0.872 0.934 Fuel Oil, Bunker C 1.014 (max.) 1.007 Fuel Oil, No. 3 (60ºF) 0.898 (max.) 0.948 Fuel Oil, No. 5 (60ºF) 0.993 (max.) 0.997 Fuel Oil, No. 6 (60ºF) 0.993 (min.) 0.997 Petrol (Gasoline) 0.75 0.886 Liquid G** G n-Heptane 0.688 0.830 n-Hexane 0.664 0.815 Hydrochloric Acid (40%) 1.20 1.095 Kerosene 0.82 0.906 Methane 0.248 0.498 Methyl Alcohol (100%) 0.796 0.892 Methyl Butane 0.625 0.791 Naphtha 0.88 0.938 Nitric Acid (91%) 1.50 1.225 Nitrogen 0.804 0.897 Iso-Octane 0.696 0.834 n-Octane 0.707 0.841 Oils, Minerals and Lubricants 0.910 0.954 Iso-Pentane 0.625 0.791 n-Pentane 0.631 0.794 Phosphoric Acid 1.88 1.371 Propane 0.508 0.713 Polythene 0.522 0.723 Styrene 0.911 0.955 Sulphuric Acid (87%) 1.80 1.342 Water 1.00 1.00 **Water = 1.0 at 70ºF. 86
Page 1 and 2:
Pressure & Flame Protection Safety
Page 3 and 4:
CONTENTS Page Birkett Range 3 Intro
Page 5 and 6:
INTERNATIONAL APPROVALS AND AUTHORI
Page 7 and 8:
FEATURES AND BENEFITS Design verifi
Page 9 and 10:
THE EFFECT OF BACK PRESSURE The con
Page 11 and 12:
LIFT CYCLE Stage 1 - Closed Inlet p
Page 13 and 14:
WB 300 - BALANCED BELLOWS GAS TYPE
Page 15 and 16:
WB 300 - BALANCED BELLOWS GAS TYPE
Page 17 and 18:
FERRULE Ferrule (government ring) A
Page 19 and 20:
RECOMMENDED MATERIAL TEMPERATURE RA
Page 21 and 22:
VALVE SELECTION TABLE D - 0.110 in
Page 23 and 24:
VALVE SELECTION TABLE E - 0.196 in
Page 25 and 26:
VALVE SELECTION TABLE F - 0.307 in
Page 27 and 28:
VALVE SELECTION TABLE G - 0.503 in
Page 29 and 30:
VALVE SELECTION TABLE H - 0.785 in
Page 31 and 32:
VALVE SELECTION TABLE - 1.287 in 2
Page 33 and 34:
VALVE SELECTION TABLE K - 1.838 in
Page 35 and 36: VALVE SELECTION TABLE L - 2.853 in
Page 37 and 38: VALVE SELECTION TABLE M - 3.60 in 2
Page 39 and 40: VALVE SELECTION TABLE N - 4.34 ins
Page 41 and 42: VALVE SELECTION TABLE P - 6.38 ins
Page 43 and 44: VALVE SELECTION TABLE Q - 11.05 in
Page 45 and 46: VALVE SELECTION TABLE R - 16.00 in
Page 47 and 48: VALVE SELECTION TABLE T - 26.00 in
Page 49 and 50: BLOWDOWN RING SETTING The blowdown
Page 51 and 52: SEAT TIGHTNESS / SEAT LEAKAGE TESTI
Page 53 and 54: FEATURES AND BENEFITS Design verifi
Page 55 and 56: D SERIES THERMAL RELIEF VALVES ITEM
Page 57 and 58: SAFEFLO - SAFETY AND THERMAL RELIEF
Page 59 and 60: D SERIES DIMENSIONS Female screwed
Page 61 and 62: FEATURES AND BENEFITS Close system
Page 63 and 64: MODE OF OPERATION Safeset consists
Page 65 and 66: STAGES OF OPERATION - TYPE 2 PILOT
Page 67 and 68: MODULATING ACTION - TYPE 8 The Type
Page 69 and 70: STAGE 4 System pressure above set p
Page 71 and 72: MATERIALS OF CONSTRUCTION - MAIN VA
Page 73 and 74: ACCESSORIES Back flow preventer Hig
Page 75 and 76: ACCESSORIES Others Similar to the s
Page 77 and 78: SAFESET PILOT FIGURE NUMBERING SYST
Page 79 and 80: Size Orifice Rating A (ins) D (ins)
Page 81 and 82: FLANGE PRESSURE / TEMPERATURE LIMIT
Page 83 and 84: (4) Constant, Fb Fb = 2k k-1 Pb P k
Page 85: BACKPRESSURE AND BLOWDOWN LIMITS Fi
Page 89 and 90: Graph 4.0 Factor Fl - For applicati
Page 91 and 92: Pressure Protection 90
Page 93 and 94: SATURATED STEAM CAPACITY CHART WB 4
Page 95 and 96: AIR CAPACITY CHART Pilot:Types 2, 4
Page 97 and 98: DUAL OUTLET / FULL BORE PILOT VALVE
Page 99 and 100: DEFINITION OF TERMS Pressure Relief
Page 101 and 102: PRESSURE TERM RELATIONSHIP Pressure
Page 103 and 104: SAFETY RELIEF VALVES B/C Series D S
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Birkett Technical Catalogue - Safety Systems UK Ltd

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