An Oil Field Workhorse

Combined Bovaird 5 HP Engine and Duplex Pump a Winning Combination

| March 2005

The catalog image at right shows a combination gas engine and duplex pump manufactured by Bovaird & Co. of Bradford, Pa.

The 5 HP engine is 4-stroke hit-and-miss, running off natural gas. Although this image shows a Wico L1 magneto, they could be equipped with hot tube ignition. A gasoline mixer could also be furnished.

The duplex pump was referred to as "Niagara" in the company's sales literature.

Two gear ratios were provided: 5-to-1 and 7-to-1. With the engine operating at 350 rpm, the 5-to-1 ratio provided 1,400 gallons-per-hour (gph) at 70 rpm pump speed, and the 7-to-1 ratio provided 1,000 gph at 50 rpm pump speed. According to the sales literature, "It is capable of delivering the full capacity of a 2-inch line up a mountain of 1,000 feet elevation." I cannot exactly determine when they were first manufactured, although I have some parts drawings that are dated 1911.

The most widely used application for these units was to pump crude oil from small storage tanks into main trunk pipelines with their higher operating pressures, or to pump oil over high ridges from isolated valleys to other storage tanks where it was easier to transport the crude to the refinery. Of particular note is the fact that these pumps were cooled by whatever substance they were pumping. If they were pumping crude oil, that is what they were cooled by.

My unit was originally owned by Bradford Transit Co., one of several pipeline companies in the area. It was located about a mile from my residence on a small oil lease. It transferred oil from a 50-barrel tank into the main line that ran through the valley. It had been vandalized, but is now restored and on display at the Coolspring Power Museum in Coolspring, Pa., along with another example.