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Diesel Oil Flow Meter 1 Inch Compact Skid Installation
Quick Answer: A 1 inch compact skid with an oval gear flow meter gives you repeatable diesel measurement from 1 to 60 L/min at ±0.5% accuracy. The skid arrives pre-piped with a strainer, air eliminator, and pulse outputs. You can install it in under two hours on a rigid base and start custody transfer or fuel tracking the same day.
In practice a loose diesel meter shipped in a box creates more work than it saves. You still need to buy a strainer, find the right fittings, fabricate a bracket, and flush the pipe. A compact skid from Silver Automation Instruments ships fully assembled on a steel frame. The 1 inch (DN25) oval gear meter is bolted in line with a Y-type strainer, a manual air vent, and a drain valve. All wetted parts are aluminium or stainless steel. The skid weighs under 18 kg and two people can position it next to a diesel day tank or a fuel transfer pump.
We designed this skid after a rental power company in South Africa told us their field teams spent half a day plumbing a new meter on site. Now their crews lift the skid off the truck, bolt four anchor bolts, connect the inlet and outlet flanges, and wire the pulse cable. Because the meter is already aligned and pre-tested, the first reading you see matches the factory calibration certificate.
The oval gear measuring unit handles diesel viscosities from 2 to 200 cP without losing accuracy. Hot diesel from a return line in a generator set can reach 80 °C and the meter tracks every litre to within ±0.5% of reading. Repeatability is better than ±0.03%. Outputs include an open collector pulse, a 4-20 mA signal with HART, and Modbus RS485. The display on the skid-mounted register shows flow rate (L/h or m³/h), totalised volume, and diagnostic messages. If you disconnect the power supply the non-volatile memory keeps the totaliser value.
Most engineers skip the filter requirement and then call us when the gears jam. A 200-mesh strainer is mandatory. The supplied Y-strainer catches scale and rust that live in diesel storage tanks. Clean it monthly during peak usage. Another detail we see on customer sites is air binding after tank switching. The manual air vent on top of the skid solves this in seconds. Open the valve until you see liquid without bubbles, close it, and the meter resumes steady measurement.
The 1 inch compact skid fits ANSI 150 or PN16 flanges. Typical pressure drop at 40 L/min is 0.15 bar. Maximum working pressure is 16 bar. The enclosure meets IP65 and the electronics are certified for ATEX Zone 2 where explosive diesel vapours may be present. For Zone 1 or Zone 21 we can supply an intrinsically safe version with a galvanic isolator.
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Here is the thing about mobile diesel measurement. A truck-mounted refuelling unit vibrates badly. The skid absorbs vibration through its rubber mounting pads while the oval gear meter stays stable. We tested this configuration on a rough gravel road in Queensland and saw zero drift after 300 km of transport.
When you send an inquiry include your flow range, operating pressure in bar, temperature in °C, and pipe size so we can recommend the right elastomer for the gears. PFA-lined aluminium is standard for clean diesel. For biodiesel blends or diesel with up to 5% methanol we switch to Viton or PTFE-coated rotors. Send your details and we will return a quote with a dimensional drawing and a wiring diagram.
Frequently Asked Questions
Q: Can I use this 1 inch skid for diesel fuel with biodiesel blends up to B20?
A: Yes. We change the gear material to Viton or PTFE-coated aluminium to handle up to B20 without swelling. Tell us the blend ratio when you request the quote.
Q: Is the oval gear meter on the skid legal for invoicing customers?
A: The meter is built to OIML R117 standards and the pulse output can connect to a flow computer that many weights and measures authorities accept. We recommend verifying local regulations for diesel custody transfer.
Q: How do I clean the gear chamber if the meter stops turning?
A: Isolate the skid, drain the line using the bottom valve, remove the four bolts on the meter cover, and wipe the gears with a lint-free cloth. No special tools are needed. The entire cleaning process takes about 15 minutes.
Q: What cable do I need for the pulse output?
A: A 3-core shielded cable of 0.5 mm² cross-section works well up to 200 metres. Connect the pulse wire to your PLC or batch controller. Silver Instruments provides a wiring colour code sticker on the terminal box.
Q: Do you offer a high-temperature version for diesel returned from hot engines?
A: Yes. The standard skid works up to 80 °C. For temperatures up to 120 °C we supply a high-temperature sensor head and stainless steel gears. Mention the maximum diesel temperature in your application and we will configure the skid accordingly.