Page 21: of Marine Technology Magazine (January 2026)

cally metal-to-metal engagement between the end cap and other good choice. Very low temperatures are tolerated by sili- groove with a face seal, so there is no extrusion gap. Parker cone, but you need a different lubricant than silicone grease.

states, “Instances have been reported of sealing pressure of 11. There is a force multiplier to consider. Assuming the end 200,000 psi with a 70-durometer o-ring.” I routinely test hadal cap is strong enough to resist ambient pressure at depth (See depth components with face seals and 70-durometer o-rings reference to “Under Pressure” below), the force acting on the to 18,500-psi using the Parker’s Design Chart A4-3 for o-ring endcap loads the smaller area of the face of the cylindrical face seals. pressure case below it. The land area supporting the multi- 5. Think of o-ring elastomers as high viscosity incompress- plied force is further reduced by the size and placement of the ible