| Product Classification | GB/T 325; ISO 15750-1 | Closed-head steel drum with permanently attached top and removable bung closures. Common nominal capacities include 20 L, 30 L, 60 L, 120 L, 200 L and 210 L. | Review the approved drawing, nominal capacity, overall dimensions, closure configuration and intended filling product. | Product type and dimensions must match the purchase specification and approved technical drawing. |
| Galvanized Steel Material | GB/T 2518; ASTM A653/A653M may be specified for export projects | Cold-reduced steel sheet with a zinc coating selected according to corrosion exposure, forming requirements and end-use conditions. Coating mass is buyer-specified rather than universal. | Check the material certificate, steel grade, sheet thickness, zinc coating designation and batch traceability. Verify coating by a recognized gravimetric or magnetic method. | Material grade, thickness and zinc coating must conform to the approved purchase specification. |
| Sheet Thickness | GB/T 325 and customer drawing | Body, cover and bottom thickness are selected according to drum capacity, UN performance level, stacking load and handling conditions. There is no single thickness suitable for every galvanized drum. | Measure multiple points with a calibrated micrometer or ultrasonic thickness gauge, excluding weld flash and damaged areas. | Measured thickness must remain within the drawing tolerance and avoid localized thinning after forming. |
| Body Forming | GB/T 325 | Deep-drawn or formed cylindrical body with specified rolling hoops, reinforcing ribs or beading. The body should be round, stable and free from sharp edges. | Inspect diameter, height, roundness, rib position, flange geometry and surface condition using gauges and calibrated measuring tools. | No significant dents, cracks, wrinkles, exposed sharp edges or deformation affecting closure or pallet stability. |
| Longitudinal and Circumferential Welds | GB/T 325; approved welding procedure | Continuous resistance-welded seams are commonly used for steel drum bodies. Weld parameters must be controlled for current, pressure, speed and electrode condition. | Perform visual inspection, seam-width checks, destructive weld-strength sampling and leak testing. Review welding-parameter records. | Seams must be continuous and free from burn-through, cracks, pinholes, excessive spatter and incomplete fusion. |
| Top and Bottom Seaming | GB/T 325; ISO 15750-1 | Cover and bottom are attached by a mechanically formed double seam with a compatible sealing compound where required. | Inspect seam appearance and dimensions; conduct periodic seam-section analysis and sealing-compound coverage checks. | The seam must be uniform, secure and free from open sections, wrinkles, cracks and sealing-compound discontinuity. |
| Bung and Closure System | ISO 15750-1; UN packaging requirements when applicable | Typical closed-head drums use 2-inch and 3/4-inch threaded bung openings with plugs, gaskets and, when required, tamper-evident features. | Verify thread dimensions, plug fit, gasket material, opening orientation and closure torque using calibrated gauges and torque tools. | Closures must seat correctly, maintain the specified seal and remain compatible with the filled product. |
| Leak Tightness | UN Model Regulations; applicable performance level and customer specification | Drums intended for liquids or dangerous goods require a documented leakproofness test according to the applicable UN packaging design type. | Use air-pressure or water-submersion testing with controlled pressure, dwell time and calibrated equipment. Test frequency may be 100% or sampling-based according to the order. | No visible leakage, pressure loss beyond the approved limit or seepage at seams, closures or joints. |
| UN Performance Testing | UN Recommendations on the Transport of Dangerous Goods; 49 CFR or ADR where applicable | For dangerous-goods service, the complete packaging design may require drop, leakproofness, hydraulic pressure and stacking tests at the specified packing group level. | Conduct testing through a qualified laboratory or an approved internal facility using the intended drum design, closure system and representative contents or surrogates. | The tested design must meet the requirements for its marked UN packaging code and packing group. |
| Stacking Strength | UN performance requirements; customer logistics specification | Stacking capacity depends on drum geometry, steel thickness, rolling hoops, pallet pattern, storage duration and temperature or humidity conditions. | Apply a controlled compressive load for the specified duration and inspect permanent deformation, seam damage and closure displacement. | The drum must retain stability and functional integrity after the specified stacking load and duration. |
| Surface Protection | Customer coating specification; coating system technical data sheet | Galvanized surfaces may be supplied bare or with an additional internal or external coating, depending on chemical compatibility, corrosion resistance and filling requirements. | Inspect coverage, adhesion, color uniformity, cure condition and dry-film thickness where a coating is specified. | No blistering, peeling, bare spots, excessive runs, contamination or coating defects that could affect service performance. |
| Internal Cleanliness | Customer product-contact specification | Interior surfaces should be free from loose scale, metal chips, oil residues, welding debris, moisture and foreign matter before closure. | Use visual inspection under controlled lighting, wipe tests, particle checks and cleanliness sampling appropriate to the filling product. | The cleanliness level must be compatible with the product, filling process and storage period. |
| Dimensional Inspection | GB/T 325; approved engineering drawing | Control nominal volume, external diameter, overall height, bung position, seam dimensions, pallet interface and closure clearance. | Use calibrated calipers, height gauges, diameter gauges, plug gauges and periodic coordinate or template checks. | Critical dimensions must meet the drawing tolerance and allow filling, closing, handling and transport without interference. |
| Marking and Identification | GB/T 325; UN marking rules when applicable | Markings may include nominal capacity, material or packaging code, production batch, date code, handling symbols and UN certification information when authorized. | Verify marking content, legibility, permanence, location and consistency with the approved packaging certificate or shipping documentation. | Required marks must be accurate, durable and traceable to the production batch. |
| Sampling and Inspection Plan | GB/T 2828.1 / ISO 2859-1; customer quality agreement | Sampling levels and acceptance criteria are established for appearance, dimensions, closure fit, coating, weld integrity and functional tests. | Use a documented inspection plan with defined lot size, sample size, AQL or zero-defect criteria, inspection records and nonconformance procedures. | The shipment is released only when all critical requirements and agreed acceptance criteria are satisfied. |
| Traceability and Documentation | ISO 9001 quality-management principles; customer documentation requirements | Maintain traceability from incoming steel coil or sheet through forming, welding, coating, closure assembly, testing, packing and shipment. | Review heat or coil numbers, production batch records, inspection reports, calibration certificates, corrective-action records and packing lists. | Every shipped lot should be traceable to its material records, process records and final inspection results. |
