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Enron Mail |
Is the difference between the first two cases and the second two cases the
higher 775 lb suction pressure that we hope we could get from pigging the line? If so, does this email say anything about whether we could get 10,000mmbtu/d to the Cal. border assuming the pigging successfully gets us to 775 lbs? Lets talk to McShane tomorrow. Thanks.. DF e Keith Petersen 12/19/2000 04:14 PM To: Drew Fossum/ET&S/Enron@ENRON cc: Subject: Gallup Horsepower Drew, the information below is the same as Terry Galassinni gave me. It looks though as the HP is still short, but I maybe reading it wrong. Keith ---------------------- Forwarded by Keith Petersen/ET&S/Enron on 12/19/2000 04:10 PM --------------------------- Bob McChane 12/19/2000 03:44 PM To: Terry Galassini/ET&S/Enron@ENRON cc: John R Keller/OTS/Enron@Enron, JERRY MARTIN/ENRON@enronxgate, Arnold L Eisenstein/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Norm Spalding/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Earl Chanley/ET&S/Enron@ENRON, Ben Asante/ET&S/Enron@ENRON, Ronald Matthews/ET&S/Enron@ENRON, Keith Petersen/ET&S/Enron@ENRON Subject: Gallup Horsepower The following is information requested by Terry Galassini: Operating Points 1A and 1B have a 750 Psig line inlet pressure and differ only in gas suction temperature, 75 Degrees F for 1A and 80 Degrees F for 1B. Both conditions can operate with the current wheel at Gallup; however, Rolls would have to agree to a faster spin of the current compressor wheel as explained in the cases. Without approval from Rolls, a new aero, $125,000, would be required.The motor horsepower is the crital component. Mr Eisenstein will have to comment on motor capability. Operating Point #1A 750 Psig - Line Suction Pressure 75 Degrees F - Gas Suction Temperature 970 Psig - Line Discharge Pressure 850 MMcfd - Compressed Volume Head = 12,442 Feet Acfm = 10,827 Actual Ft3/Min?Gas Horsepower Required = 12,300 @ 80% (Required Power to Motor = 13,369 ?Hp/9,970 KW *)?Gas Horsepower Required = 12,456 @ 79% (Required Power to Motor = 13,539 ?Hp/10,100 KW *)?* Represents an 8% total motor, gearbox and compressor bearing losses.??Two options exist for this case.??The first is to increase the compressor wheel speed from its current maximum ?continuous 9,450 Rpm speed to 9,922 Rpm (+5%). The wheel was shop tested to ?10,868 Rpm (+15%). Rolls would have to advise the warranty and saftey ?considerations. If agreed to by Rolls, the current wheel would need to ?operate at the following conditions to meet the above head and Acfm:??Compressor Speed = 9,625 Rpm (Approximate)?Motor Speed = 1,528 Rpm (Can the above horsepowers into the motor be acheived ?at this speed, Arnold????) ?Inlet velocity to compressor = 102.11 Ft3/Sec Maximum Design is 120 Ft/Sec Gallup Test Had 4 Points at or Above 102 Ft/Sec w/No vibration or Noise Problems. The second is to purchase a new aero assembly, $125,000 and 20 - 24 weeks lead time. A new aero would probably spin a little slower than the 9,625 Rpm suggested above. This would put more emphasis on motor horsepower at a speed less than 1,528 as calculated above. Again, Mr. Eisenstein would have to comment on motor capability. Operating Point #1B 750 Psig - Line Suction Pressure 80 Degrees F - Gas Suction Temperature 970 Psig - Line Discharge Pressure 850 MMcfd - Compressed Volume Head = 12,604 Feet Acfm = 10,968 Actual Ft3/Min?Gas Horsepower Required = 12,460 @ 80% (Required Power to Motor = 13,544 ?Hp/10,099 KW *)?Gas Horsepower Required = 12,617 @ 79% (Required Power to Motor = 13,715 ?Hp/10,228 KW *)?* Represents an 8% total motor, gearbox and compressor bearing losses.??Two options exist for this case.??The first is to increase the compressor wheel speed from its current maximum ?continuous 9,450 Rpm speed to 9,922 Rpm (+5%). The wheel was shop tested to ?10,868 Rpm (+15%). Rolls would have to advise the warranty and saftey ?considerations. If agreed to by Rolls, the current wheel would need to ?operate at the following conditions to meet the above head and Acfm:??Compressor Speed = 9,675 Rpm (Approximate)?Motor Speed = 1,536 Rpm (Can the above horsepowers into the motor be acheived ?at this speed, Arnold????) ?Inlet velocity to compressor = 103.45 Ft3/Sec Maximum Design is 120 Ft/Sec Gallup Test Had 4 Points at or Above 103 Ft/Sec w/No vibration or Noise Problems. The second is to purchase a new aero assembly, $125,000 and 20 - 24 weeks lead time. A new aero would probably spin a little slower than the 9,675 Rpm suggested above. This would put more emphasis on motor horsepower at a speed less than 1,536 as calculated above. Mr. Eisenstein would have to comment on motor capability. Operating Points 2A and 2B have a 775 Psig line inlet pressure and differ only in gas suction temperature, 75 Degrees F for 2A and 80 Degrees F for 2B. Both conditions can operate with the current wheel at Gallup at the current speed limit. Whether or not the current motor at the site is capable of meeting the 2A and 2B conditions without modifications is left up to Mr. Eisenstein. Operating Point #2A 775 Psig - Line Suction Pressure 75 Degrees F - Gas Suction Temperature 970 Psig - Line Discharge Pressure 850 MMcfd - Compressed Volume Head = 10,841 Feet Acfm = 10,451 Actual Ft3/Min?Gas Horsepower Required = 10,718 @ 80% (Required Power to Motor = 11,650 ?Hp/8,688 KW *)??* Represents an 8% total motor, gearbox and compressor bearing losses.??Based on test results at Gallup, the compressor speed will be approximately ?8,900 Rpm, well within its current capability. The current wheel would ?operate at the following conditions to meet the above head and Acfm:??Compressor Speed = 8,900 Rpm (Approximate)?Motor Speed = 1,413 Rpm (Can the above horsepowers into the motor be acheived ?at this speed, Arnold????) ?Inlet velocity to compressor = 98.57 Ft3/Sec Maximum Design is 120 Ft/Sec Gallup Test Had 4 Points at or Above 99 Ft/Sec w/No vibration or Noise Problems. Operating Point #2B 775 Psig - Line Suction Pressure 80 Degrees F - Gas Suction Temperature 970 Psig - Line Discharge Pressure 850 MMcfd - Compressed Volume Head = 10,984 Feet Acfm = 10,590 Actual Ft3/Min?Gas Horsepower Required = 10,858 @ 80% (Required Power to Motor = 11,803 ?Hp/8,802 KW *)??* Represents an 8% total motor, gearbox and compressor bearing losses.??Based on test results at Gallup, the compressor speed will be approximately ?8,960 Rpm, well within its current capability. The current wheel would ?operate at the following conditions to meet the above head and Acfm:??Compressor Speed = 8,960 Rpm (Approximate)?Motor Speed = 1,422 Rpm (Can the above horsepowers into the motor be acheived ?at this speed, Arnold????) ?Inlet velocity to compressor = 99.88 Ft3/Sec Maximum Design is 120 Ft/Sec Gallup Test Had 4 Points at or Above 100 Ft/Sec w/No vibration or Noise Problems. Bob
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