DN300+ Pipelines: LGF-PA66 Full-Bore vs Insertion Flow Meter

Compare on three dimensions: accuracy, cost and maintenance.

Accuracy: the full-bore LGF-PA66 is rated +/-0.2% (+/-0.5% optional). An insertion meter infers the mean velocity from a single-point measurement and is sensitive to asymmetric velocity profiles - typical accuracy is +/-1.0% to +/-2.5%. Custody transfer and DMA district metering with leakage KPIs require full-bore meters; insertion types only fit internal rough metering and trend monitoring.

Cost: the price advantage of insertion meters mainly shows above DN600. Between DN300 and DN600 the gap narrows sharply, and the LGF-PA66 uses an aviation-grade PA66 composite body - cheaper in material than a traditional stainless full-bore meter and about 40% lighter at the same size, so hoisting and flange assembly in large valve pits is easier. Total installed cost is not necessarily higher than insertion.

Maintenance: an insertion probe sits inside the pipe, fouls and tangles with debris, and needs periodic shutdown and withdrawal for cleaning - hard to do on pressurized supply mains. The full-bore LGF-PA66 has an unobstructed measuring tube, is essentially maintenance-free, and has lower life-cycle O&M cost.

Bottom line: choose the full-bore LGF-PA66 for DN300-DN600; consider insertion only above DN800 with tight budgets and trend-monitoring use. Custody-transfer points should always be full-bore.

For more details, please visit our product pages or contact our technical team.