Cooper-Bessemer Memories

Reminiscences on Running Old Iron


| May/June 2002



Cooper-Bessemer engines

carbon, or replace the packing to keep down the leakage.

Cooper-Bessemer engines, twin-tandems with cam actuaters. These are much like the engines John Heath worked on in a Medina, Ohio, gas pumping station.

Before retiring in 1992, I was maintenance mechanic for Columbia Gas Trans. We had a station in Medina, Ohio, with seven old Coopers that were installed in 1922. I had the pleasure of repairing and overhauling those wonderful old units. They were junked in 1999, but one was saved, and it went to Rough and Tumble of Kinzers, Pa. The rest were cut up for scrap.

They were very quiet running engines; you could converse with your helper without shouting when working on these units with other units running. In the engine rooms of the later high-speed engines, it was about impossible to hear anything, especially with other units running in the same engine room.

The units we had in Medina were double-acting tandem engines. There were two power cylinders connected end to end, with a 14-foot flywheel to one side. They were made as right hand or left hand engines. In other stations they had twin double-acting tandem units. These had power cylinders on both sides of the flywheel, and the ones found near you in Ottawa, Kan., will be the twin type. Our engines were double-acting tandem, 22 x 36-inch bore and stroke, with direct-connected gas compressors and rated at about 500 HP at 125 rpm. Most of the time they ran between 65 to 75 rpm.

The power pistons were designed like a steam engine. They fired from both ends, so the two power cylinders were the same as a four-cylinder engine. They were four-cycle design and burned natural gas fired by a spark plug and magneto. The original ignition was by igniter.

The power cylinder piston rods were hollow and water was pumped through them to keep the pistons cool. Where the piston rods exited from the cylinder head there were packing boxes with seal rings to hold the firing pressure. On occasion we had to remove the packing cages and clean out the