Cyclohexanone in Steel Drums: 190 kg Packaging & Loading is a standard distribution configuration for users that require full-size parcel delivery without bulk tank trucks. Cyclohexanone, CAS 108-94-1, is a cyclic ketone with molecular mass 98.15 g/mol, density 0.9478 g/cm³ at 20°C, dynamic viscosity 2.2 mPa·s, closed-cup flash point 44°C, vapor pressure 0.45 kPa at 20°C, lower flammable limit 1.1 vol% at 100°C, and autoignition temperature 420°C. At 20°C, the 190 kg net mass corresponds to a liquid volume of approximately 200.5 L. That volume is accommodated in a closed-head 200 L steel drum with suitable freeboard for thermal expansion.

The product is used in polyamide intermediate synthesis, as a solvent in nitrocellulose and vinyl resin coating systems, in degreasing formulations, and in pesticide processing. Downstream users commonly specify low water content, controlled acidity, and defined distillation range because cyclohexanone can absorb atmospheric moisture and can self-condense under catalytic conditions. For this reason, the drumming operation is controlled by a certificate-of-analysis discipline rather than bulk transfer alone. The table below lists the control parameters applied during 190 kg steel drum packaging.

What headspace, closure, and marking provisions govern the filled steel drum?

At 20°C, a 190 kg fill occupies 200.5 L. In a conventional 216.5 L total-capacity tight-head steel drum, this leaves approximately 16.0 L of vapor space. The freeboard exceeds the volumetric expansion of cyclohexanone from 20°C to 50°C under normal storage conditions. The closure system consists of 2 in and 3/4 in NPS bungs. The larger bung is used for filling and venting, and the smaller bung is used for sampling and quality verification. Gaskets are selected from expanded PTFE or PTFE-lined polyethylene. Nitrile and EPDM elastomer gaskets are not used in cyclohexanone service because ketone swelling can reduce closure torque and create a leak path after extended storage.

The drum markings include the UN packaging code for a closed-head steel drum, the packing-group compatibility letter, the hydrostatic test pressure in kPa, the tested relative density or gross mass, and the year of manufacture. The marking must be verified against 49 CFR 178.504 or the equivalent packaging chapter of the IMDG Code. Transport labeling for the product is UN 1915, Class 3, Packing Group III. Closed-head drums are preferred over open-head drums for this flash-point class because the sealed closure system limits vapor release during warehouse movements and container transport.

Before a filling campaign begins, the drumming skid is cleared of previous solvent inventory and the line is purged to below the lower flammable limit if a different solvent had been handled. The floor scale is zeroed against a traceable test mass, and the filling lance is inspected for static-bond continuity. Cyclohexanone is transferred from bulk storage by a positive-displacement gear pump or a sealless magnetically coupled pump through stainless steel piping. The line is fitted with a 50 μm bag filter to protect drum quality from particulate contamination. The filling lance includes a dead-man handle, a bottom-fill drop tube, and an overfill shutoff tied to the scale.

Net mass is controlled to 190 kg ± 0.5 kg. Production drumming lines typically achieve this tolerance with two-stage shutoff: a fast-fill valve closes at approximately 185 kg, and a slower dribble valve finishes the fill before the final mass is captured. Because cyclohexanone is a low-conductivity organic liquid, static charge accumulation is controlled by bonding the supply vessel, pump, filter housing, transfer pipe, and drum to a common earth. The bonding path resistance is maintained below 10 Ω according to NFPA 77. Bottom filling with the lance tip below the rising liquid surface is mandatory. Splash filling can generate a charged mist and raise the vapor-space ignition risk even when the bulk liquid is below the closed-cup flash point.

Transfer velocity at the lance outlet is limited to approximately 1 m/s until the outlet is submerged. After submergence, the rate may be increased to the maximum allowed by the filling equipment. Vapors displaced from the drum are returned to the feed tank or routed to a carbon adsorption system. Open venting into a confined drumming room is avoided. Filled drums are closed with the bung plug torqued to the closure manufacturer’s setting, then leak checked by roll-over or pressure decay. A sample is drawn from the 3/4 in bung using a PTFE dip tube for water and acidity verification. Drums are labeled with UN 1915, the proper shipping name, the 190 kg net mass, and the batch number before being moved to quarantine.

When the drumming hall temperature deviates from 20°C, fill-mass compensation is applied

The packaging standard defines the 190 kg net mass at 20°C. Drums filled at other temperatures are not simply aimed at the same scale value because density changes alter the occupied volume. The reference fill volume is 200.5 L. If the liquid temperature at the filler is 30°C, the density is approximately 0.939 g/cm³; filling to 190 kg would produce 202.4 L, which reduces the vapor space. If the temperature is 10°C, the density is approximately 0.957 g/cm³, and a 190 kg fill would occupy 198.5 L. Automatic temperature compensation uses an inline density meter or a calibrated density-temperature table to set the fill mass for the reference volume. For a 200.5 L fill at 30°C, the target mass is approximately 188.3 kg; at 10°C, the target mass is approximately 191.9 kg. The tolerance remains ± 0.5 kg.

Without temperature compensation, summer filling can push the liquid level into the closure zone and reduce the freeboard required for transport. The correction is particularly important when cyclohexanone has been transferred from a warm bulk storage tank, because the fill stream can remain several degrees above the drumming hall temperature. Inline density measurement according to ASTM D4052 or a calibrated Coriolis meter is preferred over manual hydrometer sampling for this application because the fill stream is continually moving and batch-to-batch composition differences are small.

Transport classification, segregation, and palletized loading for 190 kg drums

Cyclohexanone is consigned as UN 1915, Class 3, Packing Group III, with a closed-cup flash point of 44°C. It is not normally classified as a marine pollutant under the IMDG Code. Each drum bears a flammable liquid label on a red field, and the UN number is displayed on the drum body and on the pallet. A 190 kg net drum has a gross mass of approximately 210–215 kg depending on the tare mass of the steel drum. Four drums on a 1200 mm × 1000 mm pallet produce a net load of 760 kg. The palletized unit is strapped and stretch-wrapped to prevent drum shifting during road or sea container loading.

Closed-head steel drums should not be stacked more than three high in warehouse storage without engineered racking, because long-term load can deflect the lower drum closure. The storage area is segregated from Class 5.1 oxidizers, strong mineral acids, and organic peroxides in accordance with the IMDG Code segregation table. Cyclohexanone is compatible with carbon steel for routine storage, but low-color applications benefit from epoxy-phenolic interior linings to reduce trace iron pickup. The lining must be inspected for adhesion after a hot water wash using the cross-cut tape method described in ASTM D3359.

Container loading uses palletized units and lashing points to prevent lateral movement. The drumming record, including fill temperature, tare mass, net mass, and closure torque, is retained with the certificate of analysis. Opened drums that are not fully consumed within 30 days should be sampled for water and peroxide before continuing use. Avoid blending with ammonia, primary amines, or concentrated caustic at process temperatures above 60°C; these conditions can initiate aldol condensation side reactions that alter distillation profile, color, and odor.