Fireloop
FBC System Compatible

The FireLoop seismic expansion joint allows pipe movement up to ±24 inches

The Metraflex FireLoop seismic expansion joint for fire sprinkler systems is available in a variety of sizes and can accommodate pipe movements up to ±24 inches.

Refer to the selection charts below to select the proper FireLoop Model number. First, determine the type of end needed: threaded, 150# flanged, or grooved.

The proper model number is based on pipe size and amount of movement.

FIRELOOP SELECTION CHARTS

CLICK HERE if you need a drawing you can't find.
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GROOVED ENDS ±4" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1" (25mm) MLUG80100 ±4" 15" 20" 300 53 8 N/A
1-1/4" (32mm) MLUG80125 ±4" 15-3/4" 21" 300 66 10 N/A
1-1/2" (40mm) MLUG80150 ±4" 17-1/2" 23" 300 70 15 N/A
2" (50mm) MLUG80200 ±4" 20" 25" 300 78 18 BIM/CAD/ REVIT
2-1/2" (65mm) MLUG80250 ±4" 21-1/2" 28" 300 83 29 BIM/CAD/ REVIT
3" (80mm) MLUG80300 ±4" 24" 30" 300 90 43 BIM/CAD/ REVIT
4" (100mm) MLUG80400 ±4" 30" 35" 175 120 60 BIM/CAD/ REVIT
5" (125mm) MLUG80500 ±4" 36" 40" 175 186 99 BIM/CAD/ REVIT
6" (150mm) MLUG80600 ±4" 42" 46" 175 202 150 BIM/CAD/ REVIT
8" (200mm) MLUG80800 ±4" 56" 58" 175 260 286 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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GROOVED ENDS ±8" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1" (25mm) MLUG160100 ±8" 18" 23" 300 53 8 N/A
1-1/4" (32mm) MLUG160125 ±8" 19" 25" 300 66 10 N/A
1-1/2" (40mm) MLUG160150 ±8" 21" 27" 300 70 15 N/A
2" (50mm) MLUG160200 ±8" 23" 30" 300 78 19 BIM/CAD/ REVIT
2-1/2" (65mm) MLUG160250 ±8" 25" 34" 300 83 31 BIM/CAD/ REVIT
3" (80mm) MLUG160300 ±8" 27" 37" 300 90 45 BIM/CAD/ REVIT
4" (100mm) MLUG160400 ±8" 31 1/2" 43" 175 120 64 BIM/CAD/ REVIT
5" (125mm) MLUG160500 ±8" 36" 48" 175 202 105 BIM/CAD/ REVIT
6" (150mm) MLUG160600 ±8" 42" 55" 175 202 160 BIM/CAD/ REVIT
8" (200mm) MLUG160800 ±8" 56" 70" 175 260 297 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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GROOVED ENDS ±16" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1" (25mm) MLUG320100 ±16" 27" 29" 300 53 8 N/A
1-1/4" (32mm) MLUG320125 ±16" 28" 32" 300 66 12 N/A
1-1/2" (40mm) MLUG320150 ±16" 29" 34" 300 70 14 N/A
2" (50mm) MLUG320200 ±16" 31" 39" 300 78 21 N/A
2-1/2" (65mm) MLUG320250 ±16" 33" 45" 300 83 34 N/A
3" (80mm) MLUG320300 ±16" 35" 48" 300 90 44 N/A
4" (100mm) MLUG320400 ±16" 40" 56" 175 120 70 N/A
5" (125mm) MLUG320500 ±16" 44" 62" 175 186 107 N/A
6" (150mm) MLUG320600 ±16" 48" 68" 175 202 157 N/A
8" (200mm) MLUG320800 ±16" 58" 78" 175 260 293 N/A

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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GROOVED ENDS ±24" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1" (25mm) MLUG480100 ±24" 34" 35" 300 53 14 N/A
1-1/4" (32mm) MLUG480125 ±24" 35" 38" 300 66 18 N/A
1-1/2" (40mm) MLUG480150 ±24" 37" 41" 300 70 24 N/A
2" (50mm) MLUG480200 ±24" 39" 47" 300 78 38 BIM/CAD/ REVIT
2-1/2" (65mm) MLUG480250 ±24" 41" 52" 300 83 62 BIM/CAD/ REVIT
3" (80mm) MLUG480300 ±24" 43" 56" 300 90 87 BIM/CAD/ REVIT
4" (100mm) MLUG480400 ±24" 47-1/2" 63" 175 120 119 BIM/CAD/ REVIT
5" (125mm) MLUG480500 ±24" 51-1/2" 70 175 186 195 BIM/CAD/ REVIT
6" (150mm) MLUG480600 ±24" 55-1/2" 79" 175 202 290 BIM/CAD/ REVIT
8" (200mm) MLUG480800 ±24" 65-1/2" 99" 175 260 500 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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THREAD ENDS ±4" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1/2" (15mm) MLUT80050 ±4" 13" 15" 300 45 5.55 BIM/CAD/ REVIT
3/4" (20mm) MLUT80075 ±4" 13-1/4" 18" 300 47 5.5 BIM/CAD/ REVIT
1" (25mm) MLUT80100 ±4" 15" 20" 300 53 8 BIM/CAD/ REVIT
1-1/4" (32mm) MLUT80125 ±4" 15-3/4" 21" 300 66 10 BIM/CAD/ REVIT
1-1/2" (40mm) MLUT80150 ±4" 17-1/2" 23" 300 70 14.5 BIM/CAD/ REVIT
2" (50mm) MLUT80200 ±4" 20" 25" 300 78 18 BIM/CAD/ REVIT
2-1/2" (65mm) MLUT80250 ±4" 21-1/2" 28" 300 83 29 BIM/CAD/ REVIT
3" (80mm) MLUT80300 ±4" 24" 30" 300 90 43 BIM/CAD/ REVIT
4" (100mm) MLUT80400 ±4" 30" 35 175 120 55 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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THREAD ENDS ±8" Movement

Fittings - Sched. 40 Cargon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1/2" (15mm) MLUT160050 ±8" 16" 20" 300 45 5.55 BIM/CAD/ REVIT
3/4" (20mm) MLUT160075 ±8" 16" 21" 300 47 5.5 BIM/CAD/ REVIT
1" (25mm) MLUT160100 ±8" 18" 23" 300 53 8 BIM/CAD/ REVIT
1-1/4" (32mm) MLUT160125 ±8" 19" 25" 300 66 10 BIM/CAD/ REVIT
1-1/2" (40mm) MLUT160150 ±8" 21" 27" 300 70 14.5 BIM/CAD/ REVIT
2" (50mm) MLUT160200 ±8" 23' 30" 300 78 18 BIM/CAD/ REVIT
2-1/2" (65mm) MLUT160250 ±8" 25" 34" 300 83 29 BIM/CAD/ REVIT
3" (80mm) MLUT160300 ±8" 27" 37" 300 90 43 BIM/CAD/ REVIT
4" (100mm) MLUT160400 ±8" 31-1/2" 43" 175 120 55 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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THREAD ENDS ±16" Movement

Fittings - Sched. 40 Cargon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
1/2" (15mm) MLUT320050 ±16" 26" 25" 300 45 4 N/A
3/4" (20mm) MLUT320075 ±16" 26-1/2" 28" 300 47 6 N/A
1" (25mm) MLUT320100 ±16" 27" 29" 300 53 8 N/A
1-1/4" (32mm) MLUT320125 ±16" 28" 32" 300 66 12 N/A
1-1/2" (40mm) MLUT320150 ±16" 29" 34" 300 70 14 N/A
2" (50mm) MLUT320200 ±16" 31" 39" 300 78 21 N/A
2-1/2" (65mm) MLUT320250 ±16" 33" 45" 300 83 34 N/A
3" (80mm) MLUT320300 ±16" 35" 48" 300 90 44 N/A
4" (100mm) MLUT320400 ±16" 40" 56" 175 120 70 N/A

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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150# FLANGED ENDS ±4" Movement

Fittings - Sched. 40 Carbon Steel Hose & Braid - Series 300 Stainless Steel

PIPE
SIZE
MODEL # MOVEMENT END
TO
END
LENGTH PSI *SPRING
FORCE LBS.
WEIGHT LBS. 3D Drawing
2" (50mm) MLUF80200 ±4" 14-1/2" 25" 300 78 24 BIM/CAD/ REVIT
2-1/2" (65mm) MLUF80250 ±4" 16" 28" 300 83 36 BIM/CAD/ REVIT
3" (80mm) MLUF80300 ±4" 18-1/2" 30" 300 90 50 BIM/CAD/ REVIT
4" (100mm) MLUF80400 ±4" 24-1/2" 35" 175 120 69 BIM/CAD/ REVIT
5" (125mm) MLUF80500 ±4" 30-1/2" 40" 175 186 101 BIM/CAD/ REVIT
6" (150mm) MLUF80600 ±4" 36-1/2" 46" 175 202 163 BIM/CAD/ REVIT
8" (200mm) MLUF80800 ±4" 48-1/2" 58" 175 260 309 BIM/CAD/ REVIT

*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 Metric Pressure Rating PSI x 0.070307 = kg/cm(2)

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†FBC™ System Compatible indicates that this product has been tested, and is monitored on an ongoing basis, to assure its chemical compatibility with FlowGuard Gold®, BlaseMaster® and Corzan® pipe fittings. FBC™, FlowGuard Gold®, BlaseMaster® and Corzan® are licensed trademarks of The Lubrizol Corporation.

Metraflex reserves the right to change product specifications, designs and standard equipment without notice and without incurring obligation.