TechnipFMC Smith Meter MPU 1600c, Инструкция по установке, эксплуатации и обслуживанию

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Issue/Rev. 0.1 (11/18) ║ MNKS025 • Page 11
MPU Series C I/O/M Manual Product Overview
2 – Product Overview
The Smith Meter MPUs are multi-path ultrasonic meters with Signal Processing Unit
(SPU) for custody transfer or custody transfer accuracy measurement of petroleum
products. The following ultrasonic meters are covered under this manual:
• MPU 200c – Single path flowmeter
• MPU 600c – Three path flowmeter
• MPU 800c – Four path flowmeter
• MPU 1600c – Eight path flowmeter
The difference between these models is the number of paths. All other parts are
identical. The MPU 1600c has 8 paths (16 transducers), MPU 800c has 4 paths (8
transducers), and MPU 600c has 3 paths (6 transducers) and the MPU 200c has 1 path
(2 transducers). All version use identical electronics with the appropriate number of
transducers connected. The MPU 800c and 600c are lower cost versions of the MPU
1600c with slightly lower measurement performance. The MPU 200c is made for
applications with non-fiscal accuracy requirements.
2.1. Purpose of Equipment
The MPU series of ultrasonic flowmeters are non-intrusive and transducers are flush
mounted to the internal meter body to provide for undisturbed and accurate measure-
ment of gas flow. They are suitable for a wide range of applications in fiscal metering
of dry, high pressure, and non-condensing gases, such as:
• Custody transfer of gas onshore and offshore
• Pipeline node bi-directional measurements
• Gas terminals
•
Gas mixing stations
• Gas power plants
•
Pipeline junctions
• Compressor stations
The MPU 1600c has fiscal accuracy with 5D straight upstream pipe and the MPU 800c
has fiscal accuracy with 10D straight upstream pipe and 5D downstream straight pipe.
The MPU 600c has fiscal accuracy with a well-developed flow profile, hence long (>20D)
upstream straight pipe or in combination with a flow conditioner.
The MPU 200c cannot be guaranteed for fiscal accuracy.
2.2. Measurement Principle
The Smith Meter MPU Ultrasonic Gas Flowmeters operate using the acoustic transit time
measurement principle. The meter transmits ultrasonic signals between two transduc-
ers that are located on opposite sides of the meter body. These two transducers form a
measurement path through the fluid with one transducer in the upstream position and the
other downstream. The Ultra Series meters can have three, four or eight measurement
paths depending on the model.
An ultrasonic signal that is transmitted from one transducer will travel through the fluid
medium and be received by the transducer on the opposite side of the path. Each trans-
ducer can either send or receive a signal and the meter alternates between sending
and receiving across the measurement path. [An ultrasonic pulse will travel through the
meter at the velocity of sound of the fluid in the meter plus or minus the velocity that fluid
medium itself.].