Problem 1 (60%) A bank of orifice flow meters (two meters plus one on standby) is required to measure an average flow rate of 75 MMSCFD of natural gas (composition is shown below) flowing at 1,200 psia and 70F. Select orifice pipe and plate diameters. Verify gas velocity for orifice meters do not exceed the maximum flowmeter assembly velocity at operating conditions. component methane ethane propane nitrogen Mol fraction 0.90 0.05 0.03 0.02 Dlen Sale TN TWP ma Twe TS Out be Course AR Game Dua There Yale are | Peluche puri - Twa Nap wi hurtsplan le M M I am Leder -paa Kri afels pe MOCHOD wa 10 HP SUD, the > VIP MOS sortie ET SEP 20 belo papelar WS sti UL UZ UL UL UL UL UL UL UL DL 6 20 10 19 30 17 6 70 2.8 0.30 11 10 50 32 19 6 108 30 0.40 16 10 13 44 30 21 6 145 3.2 0.50 30 30 18 95 30 25 7 145 3.5 0.60 4 4 30 95 4 29 30 30 $ 145 89 0.67 44 4 44 36 44 35 11 145 42 0.75 41 4 4 95 44 44 44 13 145 45 Readed 4 44 4 98 46 44 44 Inngth for 19 145 45 BAR ys 0.75 UL - Minimum mater tube length upstream of the orifice plate in internal pipe diameter, D. (See Figure 29) Straight length shall be Beasured from the downstream and of the curved portion of the swt for only) albow or of the tee or the downstream end of the coolal portion of reducerer expander DL- Minimum downstream mater tube length in internal pipa diameters, D(Soe Pigure 3-92 SEP - Separatisa distance between piping elements in internal pipe diameter, D, measured freen the downstream end of the curved partite of the upstream elbow to the upstream end of the curved portion of the downstream elbow. Note: The tolerance on specified lengths for UL and DL 110.250 BS313282 * * B333333 e %*** *** side of the orifice plate fin multiples of published internal pipe diameter, DJ Minimum straight unobstructed meter tube length from the upstrearn and downstream Orifice Meter Installation Requirements without a Flow Conditioner FIG. 3-10 FIG. 3-13 Plate Sizing and Approximate Flowrate, Natural Gas, Natural Gas Liquids and Steam (For Flange Taps) Plate ID Luebes KEY Nominal Meter Tube ID (Inches) 6 8 10 Plate acht 1 3 4 12 16 13 115 210 347 557 50 113 202 320 471 668 911 113 201 315 467 630 836 1084 1842 1745 200 313 402 617 809 1029 1280 1563 1882 2241 2646 3104 3627 4227 0.25 0.50 0.75 1.00 1.25 1.50 1.78 2.00 2014 2.80 2.76 3.00 2 451 614 802 1016 1256 1522 1815 2135 2488 2800 3267 3705 4176 4682 313 451 615 804 1019 1202 1582 1830 2150 2519 2914 3345 3616 4330 4894 5513 6195 6949 35 3.78 4.06 0.25 0.80 0.78 1.00 1.35 1.50 1.75 2.00 2.25 2.60 2.75 8.00 325 3.50 8.75 4.00 4.25 650 4.75 5.00 5.25 6.50 5.78 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 59:36 5905 6434 7107 7830 S609 9451 10362 11351 801 1015 1256 1518 1809 2126 2469 2939 3237 3664 4119 4604 5120 5669 6251 6860 7524 8220 8957 9739 10570 11453 12993 13394 14463 15806 1516 1805 2120 2460 2827 3219 3639 4085 4558 5069 6688 6146 6736 7351 8001 3682 3397 10147 10983 11756 13620 13524 14473 15458 16511 17607 18758 19968 21242 29584 23999 25495 45 47 5.00 5.24 5.50 5,20 6.01 69 6.5 5.7 70 72 7.5 7.7 BLO 8.2 8.5 8.7 9.0 9.2 9.5 9.7 10.0 10.2 10.5 Calculations Liquid 8 Gas 8 620000 Steam 50 370 140000 50 1700000 50 250 Definitions and Equations D = Nominal diameter of Meter Tube in inches Desired Flow in Cubic Feet per Hour at Base Conditions Q-Desired Flow in Pounds per Hour hy Desired Differential in Inches of Water P = Flowing Pressure in psia px = Flowing Density in Pounds per Cubic Foot G =Gas Relative Density KEY=ch . P/Gy KEY,-106.ch. KEY = 447. (h. Pa Table Entry Desired Flow Divided by Key Select Plate Size From Table Table Entry For Selected Plate Size Approximate Flow = Table Value (For Selected Plate Size) KEY 31 2276 0.570 180.166 41.885 3441 4.00 3345 602621 3342 4.00 3345 140106 499.761 3402 4.00 3345 1671701 FI E 3-1 Eq-2 FIG. 3-4 Flow Calculation Guide Equations Ib/hr +p - MF. IV Mass Eg 3-3 Ho Volume Turbine Displacement or Ultrasonic sef/hr = P. F.F.S.MF.TV Feb Ihr =vwF, F. + P.) v.1.0618. F, Y E 34 MAS Eq 3-8 Volume schr= vVPF,+F). Fpb For FpF, Y.P..F. Ib/hr MF.IM Ole Eq 3-9 Gad H H Mass schr = MFM/ Coriolis Volume Eq 3-1 Ib/hr =p. MF.TV Eq 3-5 Mass . Turbine, Displacement or Ultrasonic gal/hr = CyCpr MF IV E 3-6 Volume IWhr = vwF, (F. +F.). Vo 1.0618. F. Mass Eq3-7 Critice gal/hr = Vh. F. (F.+F. FF. Volume Liquid Eq 3-8 Mass lb/hr = MF.IM Eq 8-10 Coriolis Volume gal/hr = Ca. Col. MF. IV Physical Constants Esc w 2. 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