Piping Technology and Products, Inc. recently designed and fabricated two 950 lb. load PTP-6 type F size 90 variable springs for an offshore oil rig.  These variable springs have an overall height of 33 1/2" and are designed for a travel range of 4". Each variable consists of an 8 5/8" dia. casing, a 13" square base plate, an 8" load flange and three spring coils with a 7 1/2" working range. All components are fabricated from carbon steel and are hot-dipped galvanized.