METRALOOP EXPANSION JOINTS

OVERVIEW THERMAL SEISMIC GAS FIRE SPRINKLERS JOINT COMPARISONS CHARTS CONFIGURATIONS

Metraloops for Seismic Applications

A safe, cost-effective seismic expansion joint.

Piping used in applications and locations subject to seismic conditions have their own set of unexpected random movements and greater costs to overcome. There is a solution – the ultra-flexible Metraloop.

The random motion common to earthquakes requires that seismic expansion joints be capable of movement in any direction. Of the 6 possible directions, Metraloop sees axial movement of the hose in only two of them – compared to four in an "L" shaped assembly. Metraloop's orientation can be changed relative to the piping, further minimizing the likelihood of compressive movement.

Metraloop offers significant cost and safety benefits not found in comparable seismic expansion joints.

• It is an inexpensive alternative to dual-tied bellows expansion joints and especially ball joints.
• During an earthquake, it protects equipment by allowing boilers, chillers, fan-coil units and other systems to move independently of the building.
• Metraloops installed at the connection also prevent nozzles from cracking or shearing off.
• And the AGA-certified Metraloops, installed in gas lines as they cross the building's seismic joints or at the connection to gas-fired equipment, protect against fire and the devastation that results.

Typical installations of Metraloops for seismic service are shown in the figures above. For more detailed installation instructions for seismic applications, refer to the NUSIG (National Uniform, Seismic Installation Guidelines) book.

To assure operation in seismic applications, the Metraloop expansion loop has been accepted for use by the California Office of Statewide Health, Planning and Development and the City of Los Angeles; and certified by the American Gas Association.

There's no limit to the seismic applications that Metraloop can handle. It can even be designed with lined hose for high velocity, double-braid for high pressures, and all stainless steel construction for media compatibility.

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