Additive Systems, Inc. (ASI) is a privately held, family-run company in Oklahoma. For almost four decades, we have specialized in the energy industry. We provide custom load rack design and fabrication, magnetically driven pumps, chemical injector blocks, metering skids, switch racks, additive systems sales, calibration services, and terminal installation, maintenance and repair. In addition, we manufacture our own line of additive pumps, injection blocks and metering equipment. We pride ourselves in keeping products on the shelf and doing what is best for our clients. We serve companies throughout the United States and Internationally.