Metering/Dispensing System for Plating
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Request a Spec Review →Yes. LibertyCES has documented Metering/Dispensing System in Plating applications. The right model depends on the fluid, concentration, temperature, flow and duty cycle, so send James your process data for a free spec review before final selection.
Notes from the vendor documentation
Chrome reduction, cyanide destruction dosing explicitly named.
Products cited in this application
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| Chrome reduction pH control range | pH 2.0-2.5 optimum (reaction slows significantly by pH 3.0, very slow by pH 4.0) | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Chrome reduction minimum detention time | 15 minutes minimum | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Chrome reduction ORP setpoint | -300mV (-400mV max) at pH 2.0 | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction (batch) stage 1 setpoints | pH raised to 11.5 using sodium hydroxide, chlorine added until ORP reaches +450mV | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction (two-step) stage 1 oxidation target | Cyanide-to-cyanate oxidation to below 0.1 ppm | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction (two-step) stage 2 detention time | Modern systems often use up to a 4-hour detention time | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
Two explicit vendor-stated safety hazards: dropping chrome-reduction pH further than needed risks releasing sulfur dioxide gas; and in batch cyanide destruction, acid injection must be manually locked out to keep pH from dropping below 11 — below that point, cyanide chemistry risks forming toxic cyanogen chloride gas instead of breaking down to cyanate.
Hexavalent chromium is, per GF Signet's own material, "1,000 times more toxic than trivalent chromium" and won't form a settleable precipitate until reduced — so the pH/ORP setpoints for chrome reduction and cyanide destruction aren't tuning parameters, they're the line between a compliant discharge and a gas-release incident. Get the pH window or detention time wrong on a plating line and the failure isn't a support ticket, it's a hazmat event.
Every claim on this page traces to real, vendor-published documentation on file with LibertyCES. Confirm current specifications with the manufacturer before final specification.
FAQ
How is Metering/Dispensing System used in Plating?
Chrome reduction, cyanide destruction dosing explicitly named.
Which Metering/Dispensing System models are specified for Plating?
Documented models include Precision Dosing Pump/Chemical Injection Pump. Confirm current specifications with the manufacturer before final selection.
What does LibertyCES need to size Metering/Dispensing System for a Plating application?
The fluid and its concentration, operating temperature, flow or volume, pressure and suction conditions, duty cycle, and the existing equipment it replaces or connects to. James reviews it for free.
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Send James your spec
Fluid, concentration, temperature, flow or volume, and where it goes. James replies with a real answer, not a catalog page.
Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated