Metal Expansion Joints Overview

Engineering Capabilities | Industry Codes | Materials Used | Manufacturing Capabilities

 

Engineering Capabilities

Unaflex® utilizes various engineering software programs to provide expansion joints in accordance with customer requirements for the utmost reliability. These are industry-leading programs written by our engineers. Finite Element Analysis (FEA), CAD/CAM programs and Expansion Joint Manufacturers Association (EJMA). Our products are fully engineered to industry accepted standards.

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Industry Codes

Unaflex® expansion joints are manufactured in accordance with EJMA's latest edition. Other Industry Standards that Unaflex® can conform to, but are not limited to, include:

  • ASME B31.3

  • ASME B31.1

  • MIL-I-45208

  • MIL-Q-9858

  • U.S. Coast Guard Requirements

 

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Bellows Material Specification

Unaflex® standard bellows material is A/SA240 321ss. Other materials available to Unaflex® to manufacture bellows are:

  • A/SA240 304ss

  • A/SA240 304Lss

  • A/SA240 316ss

  • A/SA240 316Lss

  • A/SA240 310S

  • B/SB443 Alloy 625 (Inconel® 625)

  • B/SB168 Alloy 600 (Inconel® 600)

  • B/SB575 Alloy C276 (Hastelloy® C276)

  • B/SB575 Alloy C22 (Hastelloy® C22)

  • B/SB127 Alloy 400 (Monel® 400)

  • B/SB409 Alloy 800

  • Duplex Alloy 2205

  • Hastelloy® X

  • Nickel 200

  • Alloy 20

  • AL6XN

Unaflex® welders qualified in accordance with ASME Section IX latest edition (available as required). We stock various types of bellows materials, flanges, plates, pipe and threaded rods for fast response and delivery times.

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Manufacturing Capabilities

Unaflex® maintains an in-house machine shop complete with computer-controlled flame cutting capabilities, a high-speed laser machine and a water jet machine which enables us to provide a full range of metal working capabilities.

We are able to manufacture bellows from 2” ND to 144” ND as our standard with the capability to manufacture to 222" (18'-6"). We have both punch forming and roll forming capabilities. We can perform in house dye-penetrant test, hydro and pneumatic pressure test, helium leak test and PMI (Positive Material Identification) by fully qualified Quality Control Personnel.

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