PT&P recently designed and manufactured six, PTP-4-160 type C variable springs with riser clamps for an oil refinery in Texas.  These variable springs are constructed from carbon steel and designed to support loads of 6600 lb. with a total travel of 2". The clamps are fabricated from A 387 Gr. 22 alloy steel to fit 18" pipes. Dimensional and fit-up tests were performed on the variable springs and riser clamps prior to shipping.