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Copper Metraloop® expansion joint

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Protects potable water systems during thermal cycling and seismic movement

Slim down pipe designs and installations and protect piping from seismic movement, thermal expansion and building settlement with the trim, compact copper Metraloop.

The Metraflex copper expansion joint has these benefits:

  • It is streamlined and simplifies design.
  • It takes up less space.
  • It needs just one support.
  • It takes less time to install.
  • It moves in every direction.
  • It is simply a smarter solution.

Pipes transporting hot or chilled water, steam and chemicals are all subject to varying internal temperatures – as well as significant thermal expansion. While a flexible hose and braid assembly is excellent for absorbing lateral offset and angular movement, it’s not designed for axial compression or torque. Under compression, the braid is relaxed and its pressure rating lowered, while torque introduces complex stresses that quickly fatigue the hose.

If flexible hose and braid are to be used as the stress-relieving, movement-compensating component of a piping system, it must be installed in a configuration that minimizes axial compression.

That’s where the Metraloop joint comes in. Made of flexible bronze hose and braid, it accommodates lateral offset and angular movement. In a pipe run with axial expansion and contraction, a Metraloop installed in a hanging down configuration with its legs perpendicular to axial movement can flex laterally. As long as the legs are designed with sufficient live length, the offset amount never exceeds the elastic limit of the hose, enabling it to flex indefinitely.

Compared to conventional bellows-type expansion joints and hard pipe loops, Metraloop exerts a fraction of the anchor load, requires far fewer pipe guides, and takes less space – all significantly reducing overall project costs.

There’s no limit to the thermal 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.

Sweat Ends ±1.5 inches NSF 371 Lead Free

Copper press fit ends with bronze hose & braid
(† See Temp Correction Factor)
Custom movements available. Contact Factory.

PIPE
SIZE
MODEL # MOVEMENT END TO END LENGTH PSI
SINGLE
BRAID
*PSI
DOUBLE
BRAID
*SPRING
FORCE
LBS.
WEIGHT
LBS.
3D DRAWING SUBMITTAL
1/2″ (15mm) MLS30050 ±1.5″ 7-3/4″ 11-1/2″ 706 1130 45 2 Revit/CAD Submittal
3/4″ (20mm) MLS30075 ±1.5″ 9-1/2″ 13-1/8″ 577 923 47 2 Revit/CAD
1″ (25mm) MLS30100 ±1.5″ 10-1/4″ 14-5/8″ 470 752 53 2.5 Revit/CAD
1-1/4″ (30mm) MLS30125 ±1.5″ 11-1/8″ 16-3/8″ 361 577 66 3.5 Revit/CAD
1-1/2″ (40mm) MLS30150 ±1.5″ 11-5/8″ 17-1/4″ 329 526 70 4 Revit/CAD
2″ (50mm) MLS30200 ±1.5″ 13-3/8″ 18-3/4″ 317 507 78 9 Revit/CAD
2-1/2″ (65mm) MLS30250 ±1.5″ 15″ 19-3/4″ 272 435 83 12 Revit/CAD
3″ (80mm) MLS30300 ±1.5″ 16″ 21-1/2″ 201 322 90 18 Revit/CAD
4″ (100mm) MLS30400 ±1.5″ 20″ 24-3/4″ 142 227 120 26 Revit/CAD

† When ordering a Metraloop with double-braid, please include the letter “D” at the end of the Model #. Example: MLW30200D
* Spring Force: These values reflect the total force required to move the Metraloop its full rated movement for 150 P.S.I. at 70 F.
For higher pressures please contact Metraflex.
** Loops are available in half sections for ease of handling and shipping. If this option is selected add half inch to the “end to end” dimension.

Sweat Ends ±4 inches NSF 371 Lead Free

Copper press fit ends with bronze hose & braid
(† See Temp Correction Factor)
Custom movements available. Contact Factory.

PIPE
SIZE
MODEL # MOVEMENT END TO END LENGTH PSI
SINGLE
BRAID
*PSI
DOUBLE
BRAID
*SPRING
FORCE
LBS.
WEIGHT
LBS.
3D DRAWING SUBMITTAL
1/2″ (15mm) MLS80050 ±4″ 7-3/4″ 15-3/8″ 706 1130 45 2.5 Revit/CAD Submittal
3/4″ (20mm) MLS80075 ±4″ 9-1/2″ 17-1/4″ 577 923 47 2.5 Revit/CAD
1″ (25mm) MLS80100 ±4″ 10-1/4″ 19-1/4″ 470 752 53 3 Revit/CAD
1-1/4″ (30mm) MLS80125 ±4″ 11-1/8″ 21-3/8″ 361 577 66 4 Revit/CAD
1-1/2″ (40mm) MLS80150 ±4″ 11-5/8″ 22-1/2″ 329 526 70 4.5 Revit/CAD
2″ (50mm) MLS80200 ±4″ 13-3/8″ 24-3/4″ 317 507 78 12 Revit/CAD
2-1/2″ (65mm) MLS80250 ±4″ 17″ 26-1/2″ 272 435 83 18 Revit/CAD
3″ (80mm) MLS80300 ±4″ 18-1/2″ 28-1/2″ 201 322 90 24 Revit/CAD
4″ (100mm) MLS80400 ±4″ 22″ 32″ 142 227 120 31 Revit/CAD

† When ordering a Metraloop with double-braid, please include the letter “D” at the end of the Model #. Example: MLW30200D
* Spring Force: These values reflect the total force required to move the Metraloop its full rated movement for 150 P.S.I. at 70 F.
For higher pressures please contact Metraflex.
** Loops are available in half sections for ease of handling and shipping. If this option is selected add half inch to the “end to end” dimension.