A Dutch paper factory in Holland produces approximately 160,000 tons of paper per year. The main products are copy paper, envelopes and packing paper. Low pressure steam is used to heat up the paper machines and glue. The condensate is then pumped to the power plant.
Problem
The manufacturer began looking for a method to measure low-pressure steam in an isolated pipe with a 700 mm (28 in) diameter. The main objective was a future fiscal transfer measurement of energy in megajoules supplied by the power plant to the factory and to be able to produce a complete energy balance.
Requirements
- High turndown ratio of 150:l.
- No pressure loss.
- High repeatability.
- High accuracy with regards to internal transfer.
- Low maintenance costs.
- Trouble-free operation and thus high reliability.
Equipment
The GE gas flowmeter with standard steam transducers are used in a diagonal 45 installation. A flow computer converts the 4 mA to 20 mA output signals from the meter, along with pressure and temperature inputs, into a mass flow rate (tones/hour).
Specifications
Minimum/Maximum Flow
0 to 50,000 m3/hr
Nominal Flow
35,000 m3/hr
Pressure (gage)
2.45 bar
Temperature
165°C
Accuracy
± 1% of full scale
Reproducibility
≤ 0.5%
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