On start-up, my packing glands sometimes leak, why is this? O –rings will take a “compression set” over time. This may require tightening the packing gland lightly with a small screwdriver. Also try applying some steam oil on the piston rod to that it can work into the gland seat. Usually, the gland needs moisture and oil to remain soft and flexible.
How long will the O-ring seals last? On average, 5 years life of regular service is expected. The best elastomers have been selected and applied to each pump and compressor design to maximize the service life. Rings need changed when there is excessive blow by such that the pump lacks power and cannot cycle under load. O-rings can be replaced by the owner or sent back to KSP for a thorough inspection and cleaning.
What size pump do I need? Order based upon what the prototype you are modeling would have used. A single cylinder water pump in 1.5” scale will supply enough water to keep a 1.5” scale 4-8-4 locomotive operating, although the 2-cylinder water pump (that has a larger displacement volume) does a much better job. You should always have more than one way to feed water into a boiler, especially if your steam pressure is low since injectors and steam pumps will not be able to function.
How do I specify left side or right side mount for the pump? Since a pump can be manufactured for mounting and plumbing on either side of a locomotive, it is important that your pump is ordered with the correct inlet / outlet configuration needed. The left and right sides of a locomotive are defined by point of view of an engine crew sitting in the cab looking forward down the track. It is not appropriate to define left and right side of a locomotive as an observer facing the smokebox and looking toward the cab. A Left side mount pump will have “right side” admission steam / water or air connection lines. Likewise a Right side mount pump will have “left side” admission steam / water or air connections. See photo.