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IP68 Oil Flow Meter: Dust-Tight and Submersible Enclosures for Vault Installations
Quick Answer: IP68 oil flow meters with dust-tight and submersible enclosures are built for underground vaults and pits that flood frequently. Silver Automation Instruments supplies IP68 oval gear flow meters that deliver ±0.5% accuracy on diesel, fuel oil, and lubricants even when fully submerged. These meters carry 4-20 mA HART, pulse output, and optional PT100 temperature compensation.
Vault installations present a real challenge. Process engineers in Jakarta, Manila, and Lagos have told us the same story. Their flow meter pits fill with rainwater, groundwater, or leaked product. Standard NEMA 4X or IP65 enclosures can handle splash, but they cannot survive long-term submersion. Once water enters the electronics housing, the meter drifts, 4-20 mA signals become noisy, and bearings seize on oval gear meters. Replacing a meter inside a confined vault costs time and labor, never mind the production downtime. So the question becomes: which oil flow meter can stay accurate when the vault floods?
We designed our IP68 oval gear flow meter for exactly this condition. The housing is machined from 316L stainless steel with double-sealed cable glands. The terminal compartment is filled with a non-hardening potting compound, and the lid uses a square-section O-ring that maintains a seal under 2 meters of water for 30 days continuous immersion. This is not a marketing claim. We tested it in a 2-meter water column at our factory in Nanjing before shipping units to a diesel storage terminal in Surabaya, Indonesia. That terminal had lost five turbine meters in two years to water ingress. After switching to Silver Instruments IP68 oval gear meters in 2023, they recorded zero moisture-related failures through 2024.
Engineers often ask us: why an oval gear meter for oil? Positive displacement meters do not require straight pipe runs upstream or downstream. In a cramped vault with short pipe spools, that alone saves space. Oval gear meters also handle varying viscosity from 1 cP to 2000 cP without a K-factor change. If your application is bunker fuel (380 cSt at 50 °C) or light diesel (3 cSt), the same meter body works. You just pick the right rotor material: PPS for clean lube oil, cast iron for crude oil, or stainless steel for heated fuel oil. We supply the meter with integral electronics, no remote cable runs that invite water wicking.
A paint manufacturer in Vietnam recently ordered 12 IP68 oval gear meters for solvent and resin batching. They installed the meters in below-grade pits next to their mixing tanks. During the monsoon season, pit water rose 1.5 meters and submerged the meters for a week. The flow readings on the DCS did not drift beyond 0.2%. Another customer in Nigeria uses the same IP68 design on a tank farm diesel line. Their maintenance crew no longer schedules quarterly vault pump-outs just to check the flow meters. They read totals via Modbus and perform bearing kit swaps every 18 months.
Standard
To size an IP68 oil flow meter for your vault, we need four data points: the oil type and viscosity (cP or cSt), the normal and maximum flow rate (L/min or m3/h), the pipe size (DN), and the process pressure and temperature. Send these numbers to [email protected] or use the inquiry form on our Australian site flow-meter.com.au. Ask for a quotation on the OG-IP68 series. Our team in Perth can support you with drawings and third-party IP68 test reports.
What does IP68 mean for an oil flow meter?
IP68 is defined by IEC 60529. The first digit 6 means dust-tight: zero ingress of fine talc dust. The second digit 8 means protection against continuous submersion beyond 1 meter, under conditions the manufacturer specifies. For our oil flow meters, we specify 2-meter submersion for 30 days. This covers the worst-case vault flooding scenario in most refineries and storage terminals.
Can I use an IP68 flow meter for custody transfer?
Yes, if you pair it with a Weights and Measures approved register. Our OG-IP68 meter body itself can achieve OIML R117/NMI MI-005 pattern approval. We have shipped IP68 meters to fuel depots in Ghana and the Philippines for truck loading under fiscal transfer rules. Contact us with your local trade certification requirements.
What maintenance does an IP68 oval gear meter need underwater?
The meter is designed to be pulled from the vault, inspected, and re-installed without breaking any seals. The only wear parts are the rotor bearings and shaft. We recommend a bearing kit change every 12 months for heavy oil with abrasive particles. No special tool is needed to open the housing, but you must dry the thread before closing. We stock bearing kits in our Sydney warehouse for fast shipment to Pacific region customers.
Is ATEX or IECEx certification available for vault installations?
Yes. The IP68 enclosure can be certified Ex ia or Ex d IIB T4 for Zone 1 gas environments. Vaults storing diesel or fuel oil often require gas group IIB certification. We provide ATEX and IECEx certificates from SGS. Mention the required zone classification when requesting a quote.
How do I order an IP68 oil flow meter for a pit that always floods?
Send an email with the following: fluid name, viscosity at operating temperature, flow range (min and max), pipe diameter (DN15, DN25, DN40, DN50 are common), pressure in bar, temperature in °C, and the ambient condition description. Attach a photo of the vault if you can. We reply within 24 hours with a dimensional drawing, price, and estimated shipping time from our factory.
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