Railmex Inc.

• Size2
• Diameter6/5

Bellows Expansion Joints are engineered components which require careful attention when designing a piping system. This site provides the technical information required by a system designer. By continuing to select MDC’s products, you can be assured of receiving reliable, high quality and safe piping components. MDC Metal Bellows Expansion Joints are known for their superior flexibility. The bellows are able to compensate for large movements in the axial, lateral and angular direction or mechanical vibration. MDC Bellows ensure the lowest possible forces combined with extreme longevity. This makes MDC Expansion Joints and Compensators ideal components to minimize stress and strain in pipes and extend the life of any piping system exposed to elevated temperatures. MDC Flexible Bellows Connectors ensure that suction and discharge nozzles of pumps and compressors are protected from high forces and movements and that vibration is not transmitted into the piping system. This will increase the durability of rotary equipment and reduce the noise level throughout the entire system. MDC Bellows Expansion Joints offer a cost effective alternative to other expansion devices while optimizing the productive life of the piping system. MDC expansion joints are designed to last as long as the system. All units meet the Standards of the Expansion Joint Manufacturers Association (EJMA).

Expansion Compensators are essentially a small diameter externally pressurized expansion joints where the bellows is protected by and guided within pipe housing. While the industry also offers an “internally” pressurized compensator to serve the same function, it is an inferior product, susceptible to bellows squirm. Only “externally” pressurized bellows offer stability under large axial movements in small diameter piping. Cut-away of an expansion compensator for steel piping. Compensators are used primarily in building riser systems to compensate for thermal expansion and concrete shrinkage. They are designed to absorb straight axial compression and extension and can be installed in horizontal piping as well. Proper anchoring is critical for longevity of your system. Piping should be guided in accordance with EJMA regulations.

MDC Rubber Expansion Joints are designed to relief stress in piping systems, compensate for axial, lateral, torsional and angular movement, reduce noise, and isolate vibration, specifically as pump connectors. MDC products can be custom-built in a variety of styles and configurations. MDC offers flanged and slip-on connections, single or multiple arches, and a range of elastomers to meet process conditions, including Teflon-lined joints for severely corrosive applications. Standards and Specials include a great variety of materials (see table): • Neoprene • EPDM • Gum Rubber • Natural Rubber • Butyl • Chlorobutyl • Buna-N Nitrile • SBR GRS Buna-S • Hypalon® • Viton® Fluorel® • Silicone • Teflon® TFE FEP • Most above materials available Teflon lined • For custom applications where internal and external conditions require different materials, we can fabricate joints with different tube and cover elastomers. We can offer special flange drillings, higher pressures or movements than listed standards, filled arches, and other options with most models. Control units or control cables are offered for movement restriction or containment of pressure thrust force.

Since its inception, Mark David Canada Inc. and Railmex Inc. have been heavily involved in fabrication and distribution of diesel engine parts. Our fabrication capacity includes exhaust manifolds, bellows connectors, some gaskets and a variety of machined parts. We forged long lasting relationships with a variety of reputable manufacturers and are in a position to offer over 60, 000 parts related to heavy diesel engines and locomotive components. Today, we service: Locomotive, Marine and Stationary (gen-set) markets. Our particular area of expertise involves AlcoBombardier, General Electric and EMD (General Motors) engines, but we also offer selected parts for other brands, such as Caterpillar, Detroit Diesel, Waukesha, etc. Our markets include parts resellers, engine rebuilders, Class I railroads, Short Line railroads, marine companies, Coast Guard, and some OEM clients. Ours is a truly global market, spanning all continents.

MDC supplies bellows capsules-only for variety of markets and applications. They include supplying expansion joint fabricators who weld-on their own fittings as they serve their geographical areas quickly and efficiently. Another example is supply of bellows made from exotic materials in critical applications for industrial customers who have the ability to reuse expensive flanges or other types of attachments. Bellows can be formed from most ductile materials that can be welded by the automatic T.I.G. welding process and result in a homogenous weld structure. It is imperative that companies specifying and purchasing bellows give thorough consideration to the selection of the bellows material. Due to the fact that media will vary from system to system, and that most media specifications cannot accurately reflect what actually will occur during system operation, it is not appropriate for MDC to make specific recommendations regarding bellows material. If any doubt exists concerning proper material selection for the bellows, we recommend that a metallurgist with the appropriate basic material supplier be consulted. Available bellows materials include: