A vacuum-impregnation company, Impco of East Providence, R.I., has expanded on-site services to include those for permanently sealing and repairing large castings and other parts.
For large leaking parts or components, Impco provides the engineering and technical personnel, and all necessary materials and equipment to the repair site when size or location makes it impractical to transport the equipment to an Impco service center.
On a contract basis with virtually no limitations on size, weight or wall thickness, Impco will inspect, seal and leak-test the parts so that the parts can be returned to productive use quickly with minimal downtime or other adverse impact.
During the sealing process, Impco uses a number of materials. In the initial phase, the company’s macro-porosity sealing resin often is applied to the known-leak areas. Subsequently, through various means, Impco’s sealing materials are introduced into the porosity under pressure. The choice of impregnant is key, and Impco has a range of materials for nearly any application. Cost, subsequent application, operating environment, and temperature are assessed to determine the optimum impregnant and method. Applications include large heat exchangers, steam dryers, pump and compressor housings, molds and military applications. Parts can be ferrous or nonferrous alloys, wood, plastic, concrete or other porous materials.
Also, Impco performs a leak test that simulates the operational requirements. Field-impregnated parts withstand an effective temperature range of -20 to more than 1,000°F (-30 to 540°C), and pressures from full vacuum to greater than 10,000 psi (0 to 690 bar). After processing, the parts can be painted or finished as required.