UNSPSC 24111821: Volumetric prover tank

A tank used for calibration of large-volume liquid flow meters. Prover tanks are generally mounted on mobile trailer units that can be pulled by truck from one location to another. The tanks are made of either stainless steel or carbon steel, and are designed and built with little or no dimensional tolerances. A volumetric proving tank is a reference standard used for proving meters under test. The tank is initially calibrated by an approved testing authority using a primary reference measuring instrument traceable to national standards, to an accuracy of 0,05% or better.

UNSPSC 24111821 Volumetric prover tank is a Commodity code covering storage tanks and related equipment that state and local governments procure for operational and infrastructure support across water treatment, facilities maintenance, and utility management. Recent solicitations show state and local buyers purchasing CO2 rental and refill services for aquatic facilities, industrial water treatment feed tanks, cryogenic nitrogen storage systems, general liquid storage tanks for utility operations, and large-capacity prestressed concrete potable water storage tanks. The scope diverges from the abstract "volumetric prover tank" designation—prover tanks are typically specialized metering or calibration vessels—but the code is being applied to capture a broader range of storage tank procurement including industrial tanks, potable water infrastructure, and gas delivery systems.

The issuing-body mix spans county operations departments (Collier County and Pinellas County, Florida; Gwinnett County, Georgia), municipal water utilities (City of Marietta, Georgia), and higher-education institutions (University of Wisconsin-Eau Claire). Collier County appears twice in the recent record, soliciting CO2 rental and delivery services in two separate Quick Quote cycles (posted June 30 and July 14, 2026, with response deadlines of July 8 and July 28 respectively). Recent activity concentrates in Florida and Georgia, with a single higher-education procurement in Wisconsin. Representative solicitations include Collier County QQ2026144 for FY27 CO2 tank rental, refill, and delivery to six county aquatic facilities (due July 28, 2026; pre-bid meeting July 21); Pinellas County ITB 260374 for a 12,150-gallon Microfiltration Feed Tank replacement at an Industrial Water Treatment Facility with estimated value around $103,722 (bids due April 30, 2026); Gwinnett County IWQ #1-02272026 for purchase of four 5,000-gallon vertical storage tanks and related equipment (due March 16, 2026); and City of Marietta sealed-bid procurement for a five-million-gallon prestressed concrete potable water tank replacement (due February 24, 2026).