Piping Technology & Products designed and manufactured these variable springs with permanent adjustment travel stops for a refinery in Texas.

These types of travel stops are used to:

• allow ease of installation

• provide a means for field load adjustment within the working range of the spring

• allow the springs to be "locked" easily whenever they are taken out of service for shutdowns or refurbishment of the system

For this requisition, a total of 23 variable springs with adjustable travel stops were fabricated.  The springs are made from carbon steel and the adjustment rods are made from A-325 high strength bolt material.  The springs ranged in size from PTP-1-60-F to PTP-2-180-F size spring.  The largest springs were set for an operating load of 12,900 lbs. and a hydrotest load of 14,000 lbs. and a maximum travel of ½”.  All of the springs were tested in the load cell to insure proper operation.  Per the customer's request, these springs were supplied at an expedited delivery of 3 weeks.