ASME MFC-11M:2003 pdf free download

ASME MFC-11M:2003 pdf free download.MEASUREMENT 0F FLUID FLOWBY MEANS 0F CORIOLS MASS FLOWMETERS.
3.3 Physical Installation
3.3.1 GeneraL The manufacturer should describe the preferred installation arrangement and state any restrictions of use. See Appendix C. If needed, strainers, filters, air, and/or vapor eliminators or other protective devices should be placed upstream of the meter for the removal of solids or vapors that could cause damage or induce errors in measurement. Coriolis meters are generally placed in the mainstream of the flow but can also be placed in a by-pass arrangement for density measurements.
3.3.2 Installation Criteria. Consideration should be given to the following points:
(a) the space required for the Coriolis meter installation, including provision for external prover or master- meter connections, should in situ calibration be required
(b) the class and type of pipe connections and materials, as well as the dimensions of the equipment to be used
(c) the hazardous area classification
(d) the environmental effects on the sensor (e.g., temperature, humidity, corrosive atmospheres, mechanical shock, vibration, and electromagnetic field)
(e) the mounting and support requirements
3.3.3 Full-Pipe Requirement. The meter performance is impaired if the tubes are not completely filled with the flowing fluid. The manufacturer may be consulted for information on the meter’s performance and possible methods to purge or drain gases and/or liquids from the sensor.
3.3.4 OrIentation. For proper operation, the flow sensor should be mounted such that the oscillating tube(s) remain completely filled with the process fluid while the fluid is being metered. Plugging, coating, trapped gas, or settling of solids can affect the meter’s performance. The orientation of the primary device will depend on the application as well as the geometry of the oscillating tube(s).
3.3.5 Flow Conditions and Straight Length Requirements. The performance of substantially bent bendingmode Coriolis flowmcters are generally not affected by velocity profile or fluid swirl. Straight piping lengths adjacent to the meter are not typically required. Some slightly bent Coriolis meters may be affected by velocity profile and swirl, so the Coriolis meter manufacturer’s information should be consulted for specific requirements.
3.3.6 Valves. Valves upstream and downstream of a Coriolis meter, installed for the purpose of isolation and zero adjustment, can be of any type, hut should provide tight shutoff. Control valves in series with a Coriolis meter should be installed downstream in order to maintain a higher pressure in the meter and thus reduce the chance of cavitation or flashing.
3.3.7 Cleaning. For certain applications the Coriolis meter may require in situ cleaning, which, depending on design, may be accomplished by
(a) mechanical means (using a pig or ultrasonically)
(b) self-draining
(c) hydrodynamic means:
(1) sterilization Isteaming-in-place, (SIP)
(2) chemical or biological Icleaning-in-place.