Expansion Joints | Piping Specialties | Seismic Solutions | Vibration Isolation

 

Seismic Loops
Literature
  Selection Chart
  Brochure
    Metraloop
CAD Drawings
    Veritcal Configuation
    Horizontal Config.
  Submittals
    Flanged
    Grooved
    Sweat
    Threaded
    Weld
    AGA Gas Service

 


No movement

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.

 


During an Earthquake

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 below. 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 approved 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.

 

 
 
 
Gritton & Associates has been serving Utah (UT), Idaho (ID), Nevada (NV) and Wyoming (WY) for over 60 years.
Our main lines include Bell & Gossett, Camus Hydronics, G&L, Hoffman, Kadant Johnson, McDonnell & Miller, Metraflex, and Trerice.
FHRA - Fluid Handling Representatives Association - Heat transfer, flow control, hydronics, pumping FHRA - Fluid Handling Representatives Association
FHRA is a full service organization of heat transfer, hydronics, and pump manufacturer’s representatives specializing in ITT Bell & Gossett, Hoffman Specialty, Domestic Pump and McDonnell & Miller products.