Oil & Gas / Petrochemical

Crude oil / refined-oil tank density + online monitoring of the oil–water interface

In large oil storage tank farms, long-term reliance on manual sampling for offline density measurement and on‑experience judgment of the oil‑water interface has resulted in delayed metering, high risks of water being pumped into the system, and a heavy burden of radiation management associated with nuclear density meters. The PS7300 differential pressure density meter is mounted laterally on the tank wall, providing real‑time density readings and automatically detecting abrupt changes at the oil‑water interface, enabling API gravity calculation within seconds and automated bottom‑of‑tank drainage, thereby completely replacing the nuclear source solution.

Oil/Water/Gas Interface Online Monitoring · Intelligent Water Cut Estimation

Online Concentration Monitoring of 40% / 50% Urea Solution Storage Tanks

In the urea solution storage tank area of a large fertilizer plant, challenges include lengthy manual sampling and laboratory analysis prior to loading, significant trade‑based discrepancies due to concentration drift when converting to 100% basis, elevated risks of low‑temperature crystallization, and difficulties in verifying automotive urea AdBlue compliance. The Pisonics PS7300 dual‑flange differential pressure density meter is installed side‑mounted on 40% and 50% urea solution storage tanks, providing real‑time density measurements that are converted into weight‑percent concentration. This data supports the DCS/MES systems in enabling five‑minute automated pre‑loading verification, automatic 100%‑basis trade reconciliation, crystallization‑warning‑triggered heat‑trace interlocks, and end‑to‑end compliance monitoring of the AdBlue feedstock.

Online detection on the multi-product batch interface

When a long-distance refined‑oil pipeline sequentially transports multiple batches of gasoline, jet fuel, diesel, and other products, the interface mixing zone is difficult to identify accurately, resulting in substantial volumes of substandard oil being sent back for reprocessing and annual losses amounting to several million yuan. The PS7400 online tuning‑fork concentration meter tracks process density changes with second‑level precision at ±0.001 g/cm³, coupled with temperature compensation and an explosion‑proof design, to trigger downstream cut‑off valves in real time, reducing the length of the mixing zone by 30% to 50%. It completely replaces the nuclear density meter while eliminating the burden of radiation management.

LPG / Liquefied Petroleum Gas Trade Handover

In LPG trade handover, the conventional table‑lookup estimation method and manual sampling result in density measurement errors exceeding 0.5%, leading to commodity‑value discrepancies of hundreds of thousands of yuan for ten‑thousand‑ton‑level loading and unloading operations. The PS7400 explosion‑proof online tuning fork concentration meter is directly installed on the main pipeline for loading onto tank trucks or ships, delivering real‑time process‑condition density within seconds. When paired with a volumetric flowmeter and a flow computer, it enables real‑time mass settlement in compliance with the OIML R117 standard.

Marine fuel / HFO·VLSFO·MGO refueling measurement

At the ship refueling terminal, during the heated transfer of multiple fuel grades—including HFO, VLSFO, and MGO—real-time density measurement is required under high-temperature conditions of 80–95°C to convert flow rates into tonnage. However, conventional sampling analysis is time‑lagged, and contact-type instruments are prone to thermal drift and seal failure. The PS7400 high‑temperature tuning fork concentration meter is installed directly on the main pipeline downstream of the heater, operating reliably across the full temperature range of −25 to 150°C. Coupled with PT1000 temperature compensation, it delivers real‑time standard density at 15°C in accordance with ISO 91, enabling automatic BDN document generation and MARPOL Annex VI‑compliant settlement.