Piston Rods
Piston rods are generally designed in accordance with API618. Packing regions are usually coated and ground in durable Tungsten Carbide, though other hardening processes can be offered. We prefer to use the latest materials used in industry, which in most cases will be a significant improvement on the original materials. Attention to detail is paid to heat treatment, surface finish and tolerances, which is critical to proper functioning when installed.

Pistons
We supply many pistons, from small, very high-pressure multi-piece assembled designs to very large 1-piece hollow cast designs. Generally, pistons are designed in 1-3 pieces. Materials such as spheroidal graphite iron and titanium-aluminium alloys are often used. 1-piece hollow cast piston designs may be converted to 2-piece multi web type, in which case, loads will be checked by FEA to confirm correct design. All Aluminium pistons are hard anodized to ensure that the piston ring wear surfaces have an additional hard-wearing layer.

We regularly supply piston rod assemblies to clients. Rather than supply separate piston rods and pistons, we assemble the piston and rod with the corresponding nut, ensuring correct tightening and locking procedures are followed. Where solid rider rings are required, we also will fit the rider rings. Clients appreciate this additional service as it saves them time prior to overhaul.

Crankshafts
We regularly supply crankshafts for a wide range of compressors. The number of throws ranges from 1 to 6. Counterweights may be integrally forged with the crankshaft or separately assembled. In all cases, full inspection reports are provided, including material, heat treatment, crack and final dimensional inspection.