Manual Corken Z400
Páginas: 8 (1905 palabras)
Publicado: 12 de febrero de 2013
LIQUEFIED GAS PUMP INSTALLATION ENGINEERING DATA AND DESIGN HANDBOOK
Z400C
THE APPLICATION OF PUMPS TO LIQUEFIED GAS TRANSFER
Although we cannot change the nature of the liquefied gas, there are many things we can and must do to design an acceptable liquefied gas pumping system.Of the many hundreds of pump manufacturers in the United States, only a handful recommend their equipment for transferring liquefied gases. There are various reasons for this, but the basic problem has to do with the nature of a liquefied gas. The specific peculiarity of a liquefied gas is that a liquefied gas is normally stored at its exact boiling point. This means that anyreduction in pressure, regardless of how slight, or any increase in temperature, no matter how small, causes the liquid to start to boil. If either of these things happen in the inlet piping coming to the pump, the pump performance is severely affected. Pump capacity can be drastically reduced, the pump can be subjected to severe wear and the mechanical seal and the pump may run completely dry,causing dangerous wear and leakage.
Many of these design hints are incorporated in the accompanying illustrations. You will note that each drawing is over-simplified and illustrates just one principle. Normal fittings, strainers, unions, flex lines, valves, etc. have been ignored so that just that portion of the piping which applies to the problem is shown. Do not pipe aplant from these incomplete illustrations! You should also note that all of these rules can be violated to a degree and still have a workable pumping system. You may see several places where your plant is at variance from some of these. However, you should be aware that every violation is reducing your pumping efficiency and increasing your pump maintenance cost. Theprinciples apply to all makes and styles of liquefied gas pumps (rotary positive displacement, regenerative turbine or even centrifugal types).
This booklet is used in Corken Training Schools. Corken cooperates with gas marketers, trade associations and other groups to conduct complete training schools for persons involved in the transfer of liquefied gases.These presentations include product information, safety, plant design and equipment service/maintenance.
Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of Corken products must be made only by experienced, trained and qualified personnel. (3) Maintenance, use and installation of Corkenproducts must comply with Corken instructions, applicable laws and safety standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia). (4) Transfer of toxic, dangerous, flammable or explosive substances using Corken prod- ucts is at user’s risk and equipment should be operated only by qualified personnel according to applicable laws and safety standards.CORKEN, INC. • A Unit of IDEX Corporation
3805 N.W. 36th St., Oklahoma City, OK 73112
Phone (405) 946-5576 or 1-800-631-4929
Fax (405) 948-7343
Visit our website at http://www.corken.com or e-mail us at info.corken@idexcorp.com2
1 No!
Don't use restricted inlet line!
2 Yes!
Use inlet line larger than pump suction nozzle. Same size as nozzle OK on short runs.
Pressure drop caused by restriction in suction line will cause vaporization and cavitation.
3 No!
4 Yes!...
Z400C
THE APPLICATION OF PUMPS TO LIQUEFIED GAS TRANSFER
Although we cannot change the nature of the liquefied gas, there are many things we can and must do to design an acceptable liquefied gas pumping system.Of the many hundreds of pump manufacturers in the United States, only a handful recommend their equipment for transferring liquefied gases. There are various reasons for this, but the basic problem has to do with the nature of a liquefied gas. The specific peculiarity of a liquefied gas is that a liquefied gas is normally stored at its exact boiling point. This means that anyreduction in pressure, regardless of how slight, or any increase in temperature, no matter how small, causes the liquid to start to boil. If either of these things happen in the inlet piping coming to the pump, the pump performance is severely affected. Pump capacity can be drastically reduced, the pump can be subjected to severe wear and the mechanical seal and the pump may run completely dry,causing dangerous wear and leakage.
Many of these design hints are incorporated in the accompanying illustrations. You will note that each drawing is over-simplified and illustrates just one principle. Normal fittings, strainers, unions, flex lines, valves, etc. have been ignored so that just that portion of the piping which applies to the problem is shown. Do not pipe aplant from these incomplete illustrations! You should also note that all of these rules can be violated to a degree and still have a workable pumping system. You may see several places where your plant is at variance from some of these. However, you should be aware that every violation is reducing your pumping efficiency and increasing your pump maintenance cost. Theprinciples apply to all makes and styles of liquefied gas pumps (rotary positive displacement, regenerative turbine or even centrifugal types).
This booklet is used in Corken Training Schools. Corken cooperates with gas marketers, trade associations and other groups to conduct complete training schools for persons involved in the transfer of liquefied gases.These presentations include product information, safety, plant design and equipment service/maintenance.
Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of Corken products must be made only by experienced, trained and qualified personnel. (3) Maintenance, use and installation of Corkenproducts must comply with Corken instructions, applicable laws and safety standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia). (4) Transfer of toxic, dangerous, flammable or explosive substances using Corken prod- ucts is at user’s risk and equipment should be operated only by qualified personnel according to applicable laws and safety standards.CORKEN, INC. • A Unit of IDEX Corporation
3805 N.W. 36th St., Oklahoma City, OK 73112
Phone (405) 946-5576 or 1-800-631-4929
Fax (405) 948-7343
Visit our website at http://www.corken.com or e-mail us at info.corken@idexcorp.com2
1 No!
Don't use restricted inlet line!
2 Yes!
Use inlet line larger than pump suction nozzle. Same size as nozzle OK on short runs.
Pressure drop caused by restriction in suction line will cause vaporization and cavitation.
3 No!
4 Yes!...
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