Proco Products, Inc.

- Model Style 251/BT - PTFE & FEP Lined Rubber Expansion Joint

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The Proco Series 251/BT Lined Expansion Joints are designed for tough, demanding, corrosive chemical applications such as chemical and petrochemical process facilities and highly corrosive industrial piping and pollution control systems. Use of the 251/BT expansion joints is especially prevalent in the paper industry, where their ability to resist corrosive attack at elevated temperature and pressure is unrivaled by other competitive metal or plastic expansion joints.

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Series 251/BT expansion joints are chemically resistant against the entire pH range, and can easily handle tough pulp/paper applications including:

  • White-green-black liquor
  • Beach plant chlorination
  • Caustic extraction stages

The new 251/BT will replace the Proco Series FFP lined rubber expansion joint. This new, improved product has been completely re-engineered to provide even more strength, flexibility and movement capabilities. Manufactured using tire cord industry technology, the Series 251/BT combines woven polyester tie cord into a fabric matrix, which is then bonded with a Chlorobutyl elastomer that is reinforced with wire and bonded to a PTFE liner. This combination creates a product with an increased operating performance.

Some notable features of the Proco Series 251/BT include:

  • Greater movements with a lower/wider arch profile
  • Chemical service capability at minimal cost
  • Absorption of pipe movements and stress
  • Reduction of system noise
  • Isolation of mechanical vibrations
  • Compensation for alignment/offset
  • Elimination of electrolytic action and electrolysis
  • Protection against start up and surge forces

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Chemically resistant against the entire pH range, PROCO Series 251 PTFE and FEP expansion joints are designed to handle practically every chemical plant application. Installed next to mechanical equipment or between anchor points of a piping system, specify the PROCO 251/BT to: (1) Absorb Pipe Movements/Stress, (2) Reduce System Noise, (3) Isolate Mechanical Vibrations, (4) Compensate Alignment/ Offset, (5) Eliminate Electrolytic Action and Electrolysis, (6) Protect Against Start-Up/Surge Forces. Our history in the manufacture of expansion joints dates back to 1930. When you need an engineered rubber expansion joint solution to a piping problem, call PROCO.

Series 251/BT replaces Series FEP. The new and improved PROCO Series 251/BT will replace the PROCO Series FEP lined rubber expansion joint. (Series FEP products will be available in certain sizes. Contact Proco for information.) This new hand-built product has been completely re-engineered to provide improved strength, flexibility and movement capabilities. Manufactured utilizing tire cord industry technology, the Series 251/BT combines woven polyester fabric and polyester tire cord into a fabric matrix and bonded with a Chlorobutyl elastomer that is reinforced with wire and bonded to a PTFE or FEP liner to create a product with greater operating performance.

Greater Movements with a Lower/Wider Arch Profile. The movements for the PROCO Series 251/BT exceed the specification of the Fluid Sealing Association’s, Rubber Expansion Joint Division Technical Handbook (Sixth Edition), Table V. Due to a new and improved lower, wider profile arch, more axial compression and extension coupled with lateral and angular movements can be obtained without increasing the face-to-face requirements. For greater movements based on re-engineering and new product construction for highly corrosive piping installations, specify the PROCO Series 251/BT PTFE and FEP lined expansion joints.

Chemical Service Capability at Minimal Cost. Expensive, exotic metal expansion joint for low temperature service can be replaced with the PROCO Series 251/BT PTFE and FEP lined expansion joints. Engineered to operate up to 225 PSIG and 250°F, the PROCO Series 251/BT can be specified for a wide range of piping system requirements. Our standard stock is furnished with an exterior Chlorobutyl cover. Other elastomer covers are available on special order. Compared to metal, plastic or other rubber-backed competitive products, you will invest less and have access to in-stock availability with the high quality PROCO Series 251/BT.

Specifications Met. PROCO has assigned conservative pressure ratings to the Series 251/BT and FEP lined rubber expansion joints. The ratings, however, meet the requirements of the Fluid Sealing Association’s, Rubber Expansion Joint Division Technical Handbook (Sixth Edition), Series C. The pressure ratings for the Series 251/BT PTFE and FEP lined rubber expansion joints have been fully tested and are based on a minimum fourto- one safety factor. For pressure protection with confidence, specify the PROCO Series 251/BT.

Prevents Electrolysis and Electrolytic Action. In Chemical applications when metallic expansion joints are used, they are generally of a metal dissimilar from the pipeline. This may create an electrolytic galvanic action that could be destructive to the connector equipment or piping system. The use of the rubber-backed PROCO 251/BT PTFE and FEP lined expansion joints prevents this potential hazard. Additionally, our 251/BT expansion joints are non-conductive and eliminate the metal-to-metal contact at the flange face thus stopping electrolysis.

Absorbs Vibration - Noise - Shock. The PROCO Series 251/BT PTFE and FEP lined rubber expansion joints are a replacement for “sound transmitting” metallic expansion joints. Sound loses energy traveling axially through an expansion joint. Water hammer, pumping impulses, water-borne noises and other forms of strain-stress-shock are cushioned and absorbed by the PTFE or FEP lined/rubber elastomer expansion joint, not related to piping. Install the Series 251/BT in a system to reduce vibration transmission when the piping section beyond the expansion joint is anchored or sufficiently rigid. For quiet, stress-free systems specify the PROCO Series 251/BT.

Large Inventories Mean Same-Day Shipment. We maintain the largest inventory of expansion joints in the world. Rubber, PTFE or FEP Lined, Plastic or Metal Hose — PROCO can ship the products you need when you need them! In fact, when it comes to expansion joints, if PROCO doesn’t have them in stock … nobody does!

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