Ariel cylinders are provided without water jackets.  Water jackets were originally used to maintain the dimensions of cylinder bores with longer piston strokes and more complicated casting geometry.  Shorter stroke cylinder designs combined with casting quality allow the use of non-jacketed cylinders while maintaining stable bore geometry. Despite the misconception, water coursing through the cylinder passages does not have an appreciable effect on the bore temperature and does not impact wearing component life.

All ASTM A395 ductile iron cylinder bores are surface hardened with an ion-nitride process to increase cylinder bore wear resistance. Ion nitride surface hardening is provided in lieu of providing a sacrificial wear part (liner).  Should a cylinder bore become damaged beyond the re-bore capability, a replacement can be provided. Since Ariel cylinders are non-jacketed (simpler casting geometry), the downtime and cost of a replacement cylinder is generally lower than the downtime and cost of removal and re-installation of a cylinder liner.  

Ariel cast cylinders are designed and pressure rated based on guidelines from Section VIII, Division 1, of the ASME Pressure Vessel Code. Although compressor cylinders categorically cannot be ASME Code stamped, Section VIIl, Division 1 of the ASME Pressure Vessel Code provides consistent design and pressure rating methods. Please contact Ariel Design Engineering for a description of the methods applied.

Ariel cylinders may be rebored within limits.  A bore restoration guideline is available from Ariel upon request.