metraflex-metraloop

METRALOOP®

EXPANSION JOINT DESIGN GUIDE

Special production Metraloops are certified by the

AMERICAN GAS ASSOCIATIONfor use on gas pipe lines.Contact factory for more

information.

®

Catalog LOOP93

Certified by theAMERICAN GAS ASSOCIATION

for use on gas pipe lines.

®

• NO THRUST LOADS• MINIMAL ANCHOR LOADS

• MINIMAL GUIDING• SEISMIC RATINGS

2323 W. HUBBARD ST • CHICAGO, IL 60612 • 800-621-4347 • 312-738-3800 • FAX 312-738-0415 • www.metraflex.com

T H E ME T RA LOOP® ADVANTAGE . . .. . . D E S IGN FR E EDOM !

X

X

X

6' - 6"

13'

36"

46"

AnchorLoads

12800 Lbs.

1200 Lbs.

202 Lbs.

Pipe Guide

Bellows Expansion Joint

Hard Pipe Loop

Design ConditionsPipe - 6 inch Schedule 40Movement - 4" Axial CompressionPressure - 150 PSITemperature - 300∞FLength of Run - 177 feet

• 98% less anchor load thanBellows Expansion Joint

• 83% less anchor load thanHard Pipe Loop

• 75% less space required thanHard Pipe Loop

Drawn to Scale

X

X

X

AnchorLoads

12800 Lbs.

1200 Lbs.

202 Lbs.

BENEF ITS :

• Movement in all directions - absorbing seismic energy withlow activation forces, standard seismic bracing is adequatefor adjacent piping. Ball or bellows joints havesignificant breakaway torques or thrust loads that exceedstandard seismic bracing.

• Fire Sprinkler Systems - UL listed, the Fireloop providesseismic protection in a compact, easy to install compo-nent. See the Fireloop Design Guide or websitewww.metraflex.com for full details.

• Gas - Protect against devastating fire by installingC.S.A./A.G.A. certified Metraloops in gas lines asthey cross the building's seismic joints or at theconnection to gas-fired equipment.

• Reduce Costs - Metraloops are far less expensive thanalternative seismic expansion joints, particularlyball-joints.

• Protect Equipment - Metraloops allow equipmentsuch as boilers and chillers to move independentlyfrom the building during an earthquake. Preventnozzles from cracking or shearing in earthquakesby installing Metraloops at the connection.

For Seismic Installations,see Page 11.



®

YOUR F I RST CHO ICEBECAUSE . . .

• Path of Least Resistance - which is why GUIDESare not always required. With an incredibly low force tocompress, the Loop is the path of least resistanceabsorbing thermal movement before the pipe begins tobow. Long before thermal expansion develops enoughforce to start to compress traditional bellows type jointsor hard pipe loops, the column loading strength of pipeis exceeded and the pipe begins to bow. Hence theneed for numerous and specifically placed pipe guidesup and down the pipe run in traditional piping systems.

• Anchor Loads - Almost None - compared to bellows orhard pipe loops. Bellows type joints exert tremendousanchor loads, requiring answers to: is the concretethick enough, what size anchor bolts, is the steel strongenough, where do I make the attachments??? TheMetraLoop anchor loads are so low; these questionsmay be immaterial.

• Amount of movement - virtually any. Stock sizes areshown on pages 4-5, however movements greaterthan 3 or 6 FEET! are not uncommon.

1

A L L M E T A L L I C CON S T R U C T I O N

TYP ICAL SPEC I F ICATION

Provide flexible expansion loops of size and type notedon drawings. Flexible loops shall consist of two flexiblesections of hose and braid, two 90° elbows, and an180° return assembled in such a way that the pipingdoes not change direction, but maintains its coursealong a single axis. Flexible loops shall have a factorysupplied, center support nut located at the bottom of the180° return, and a drain/air release plug. Flexibleloops shall impart no thrust loads to system supportanchors or building structure. Loops shall be installedin a neutral, pre-compressed or pre-extended conditionas required for the application. For steam service,loops must be installed with flexible legs horizontal toprevent condensate buildup. Install and guide permanufacturer’s recommendations. Materials ofconstruction and end fitting type shall be consistent withpipe material and equipment/pipe connection fittings.For natural gas service, connectors shall be A.G.A.certified. Flexible expansion loops to be “Metraloop®” asmanufactured by the Metraflex Company®, Chicago, IL.

TABLE OF CONTENTS

MetraLoop Drawing . . . . . . . . . . . . . . . . . .Inside Front Cover

Seismic Benefits . . . . . . . . . . . . . . . . . . . . .Inside Front Cover

Typical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

How the MetraLoop Works . . . . . . . . . . . . . . . . . . . . . . . . . .2

Typical Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

MetraLoop Selection Chart - Sweat, Thread & Flanged Ends . .4

MetraLoop Selection Chart - Weld & Grooved Ends . . . . . . . .5

Installation/Guiding Considerations . . . . . . . . . . . . . . . . . . .6

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-9

Thermal Expansion Applications . . . . . . . . . . . . . . . . . . . . .10

Seismic Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Test Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Pressure Drop Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

MetraLoop Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . .14-16

Terms and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

CARBON STEEL,COPPER OR

STAINLESS ENDS

BRAZEOR

WELDMENT

STAINLESS STEEL ORBRONZE FLEXIBLEMETALLIC HOSE

STRESS RELIEVINGWELD COLLAR

STAINLESS STEELOR BRONZE BRAID

THERMAL EXPANSION:The MetraLoop is simply a flexible variationof the tradition hard pipe loop. For any givenlength of pipe and given temperature change,the amount of movement can be calculatedand the appropriate MetraLoop can bedesigned. When installed in a pipe run theMetraLoop’s legs simply bend laterally tocompensate for the pipe’s expansion orcontraction. Unique to the loop is theincredibly low amount of force required tobend its legs, minimizing anchor loads,guiding and installation costs.

SEISMIC MOVEMENT:The two flexible legs connected by anunrestrained return bend, will allow apredetermined amount of pipe movement inany direction. (Typical design movement is±4 inches in any direction, howevermovement of several feet in any direction ispossible). With the loops extreme flexibilityand low force to move, the loop absorbs theseismic energy and imposes minimal loadson the adjacent pipe hangers, supports ornozzle loads on major equipment. See page11 for more details.

2

HOW T H E M E T R A L OO P WO R K S

SEISMIC MOVEMENT: ALL DIRECTIONAL

THERMAL EXPANSION: AXIAL MOVEMENT

3

Illustrated below are the typical orientations for the MetraLoop. No support is required for the 180° return bend for standard loops 2-1/2”diameter and smaller. However due to the weight of the return bend and the extreme flexibility of the loop, larger sizes require support toprevent the 180 from sagging in all orientations except when installed hanging down as shown in illustration #2. Guides are recommendedbut not always required see bottom of page 6 for more details. Special Note - For steam service minimizing the entrapment of condensateis crucial and loops should be installed as shown in illustration #1. Detailed installation considerations are noted on the following pages.

T Y P I CA L I N S T A L L A T I O N S

SUPPORT MUST BE PROVIDED TO PREVENT THE LOOP FROMDROOPING OR TORQUING PIPE. SUPPORT MUST ALLOW THE180° RETURN, TO MOVE HORIZONTALLY BACK AND FORTH 1/4",AS THE LOOP FLEXES.

*RECOMMENDED INSTALLATION FOR STEAM. ANY OTHERORIENTATION MAY CAUSE CONDENSATE TO COLLECT.

STEAM*

#1

METRALOOPTM

HOR IZONTAL– HORIZONTAL RUN –

LOOP SHOULD HANG STRAIGHT DOWN AND BE FREE TOFLEX.

#2

METRALOOPTM

HANG ING DOWN– HORIZONTAL RUN –

SUPPORT MUST BE PROVIDED TO PREVENT THE LOOPFROM LEANING. PIPE HANGER ROD SHOULD BE LOOSEENOUGH TO ALLOW THE 180° RETURN TO MOVE UP ORDOWN, OR BACK AND FORTH, AS THE LOOP FLEXES.

#3

METRALOOPTM

STRAIGHT UP– HORIZONTAL RUN –

FOR TIGHT PIPE RUNS, ANY SIZE OR NUMBER OF LOOPSCAN BE DESIGNED TO NEST INSIDE ONE ANOTHER. TOORDER, SPECIFY SEQUENCE OF PIPE DIAMETERS ANDCORRESPONDING DISTANCES BETWEEN PIPECENTERLINES.

#4

METRALOOPTM

– NESTED –

LOOP MUST BE SUPPORTED TO ALLOW THE 180° RETURNTO MOVE HORIZONTALLY BACK AND FORTH, AND UP ORDOWN, AS THE LOOP FLEXES.

#5

METRALOOPTM

– VERTICAL RUN –

THE METRALOOP EXPANSION LOOP CAN BEMANUFACTURED IN THIS CONFIGURATION TO BE ASCOMPACT AS POSSIBLE. MULTIPLE OVER-UNDER LOOPSCAN ALSO BE INSTALLED IN NESTED CLUSTERS TOFURTHER TAKE ADVANTAGE OF THIS COMPACTARRANGEMENT.

#6

METRALOOPTM

– OVER/UNDER –

4

M E T R A L OO P S E L E C T I O N C H A R T

EPIPEZIS #LEDOM

-EVOMTNEM

OTDNEDNE HTGNEL

ISPELGNIS

DIARB

ISP†ELBUOD

DIARB

GNIRPS*ECROF.SBL

THGIEW.SBL

"2/1 )mm51( 05003SLM05008SLM

"5.1±"4±

"5"8

"11"51

607 0311 5425.2

"4/3 )mm02( 57003SLM57008SLM

"5.1±"4±

"6"2/1-9

"51"91

25.2

"1 )mm52( 00103SLM00108SLM

"5.1±"4±

"2/1-6"4/1-01

"61"12

074 257 355.23

"4/1-1 )mm03( 52103SLM52108SLM

"5.1±"4±

"4/3-7"4/1-11

"71"22

5.34

"2/1-1 )mm04( 05103SLM05108SLM

"5.1±"4±

"4/1-9"4/3-11

"81"42

923 625 0745.4

"2 )mm05( 00203SLM00208SLM

"5.1±"4±

"4/1-11"41

"12"62

921

"2/1-2 )mm56( 05203SLM05208SLM

"5.1±"4±

"31"51

"12"72

272 534 382181

"3 )mm08( 00303SLM00308SLM

"5.1±"4±

"41"2/1-61

"32"92

8142

"4 )mm001( 00403SLM00408SLM

"5.1±"4±

"81"22

"62"23

0216213

775 329 74

163 775 66

713 705 87

102 223 09

241 722

EPIPEZIS #LEDOM

-EVOMTNEM

OTDNEDNE HTGNEL

ISPELGNIS

DIARB

ISP†ELBUOD

DIARB

XAMMAETS

.SSERP

GNIRPS*ECROF.SBL

THGIEW.SBL

"2/1 )mm51( 05003TLM05008TLM

"5.1±"4±

"21"51

"31"71

5701 0271 003 5435.5

"4/3 )mm02( 57003TLM57008TLM

"5.1±"4±

"4/1-21"4/1-51

"31"81

297 7621 003 7435.5

"1 )mm52( 00103TLM00108TLM

"5.1±"4±

"21"61

"51"02

175 419 003 3558

"4/1-1 )mm23( 52103TLM52108TLM

"5.1±"4±

"2/1-31"4/3-61

"61"12

135 058 003 66701

"2/1-1 )mm04( 05103TLM05108TLM

"5.1±"4±

"51"2/1-71

"71"32

274 557 003 075.015.41

"2 )mm05( 00203TLM00208TLM

"5.1±"4±

"81"02

"91"52

005 057 003 875181

"2/1-2 )mm56( 05203TLM05208TLM

"5.1±"4±

"12"2/1-12

"12"82

783 916 003 383292

"3 )mm08( 00303TLM00308TLM

"5.1±"4±

"62"62

"32"03

882 134 612 099334

"4 )mm001( 00403TLM00408TLM

"5.1±"4±

2323

"82"53

2015595

232 173 681

EPIPEZIS #LEDOM

-EVOMTNEM

OTDNEDNE HTGNEL

ISPELGNIS

DIARB

ISP†ELBUOD

DIARB

XAMMAETS

.SSERP

GNIRPS*ECROF.SBL

THGIEW.SBL

"2 )mm05( 00203FLM00208FLM

"5.1±"4±

"2/1-21"2/1-41

"91"52

005 057 003 871242

"2/1-2 )mm56( 05203FLM05208FLM

"5.1±"4±

"2/1-51"61

"12"82

783 16 9 03 0 830363

"3 )mm08( 00303FLM00308FLM

"5.1±"4±

"2/1-81"2/1-81

"32"03

882 134 612 096405

"4 )mm001( 00403FLM00408FLM

"5.1±"4±

"2/1-42"2/1-42

"82"53

3696

"5 )mm521( 00503FLM00508FLM

"5.1±"4±

"2/1-03"2/1-03

"23"04

191 603 351 68119101

"6 )mm051( 00603FLM00608FLM

"5.1±"4±

"2/1-63"2/1-63

"73"64

841361

"8 )mm002( 00803FLM00808FLM

"5.1±"4±

"2/1-84"2/1-84

"84"85

512 572 511 062782903

"01 )mm052( 00013FLM00018FLM

"5.1±"4±

"2/1-06"2/1-06

"55"76

354484

"21 )mm003( 00213FLM00218FLM

"5.1±"4±

"2/1-27"2/1-27

"36"47

061 022 49 093636666

"41 )mm553( 00413FLM00418FLM

"5.1±"4±

"2/1-48"2/1-48

"17"5.08

636666

"61 )mm004( 00613FLM00618FLM

"5.1±"4±

"2/1-69"2/1-69

"5.87"5.19

011 071 58 009636666

"81 )mm554( 00813FLM00818FLM

"5.1±"4±

"2/1-801"2/1-801

"5.68"001

58 051 57 0001636666

232 173 681 201

561 462 231 202

002 072 001 382

011 521 36 607

† 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.

150# FLANGED ENDS • FITTINGS - SCHED. 40 CARBON STEEL • HOSE & BRAID - SERIES 300 STAINLESS STEEL

SWEAT ENDS - FEMALE • FITTINGS - COPPER • HOSE & BRAID - BRONZE

THREAD ENDS - MALE • FITTINGS - SCHED. 40 CARBON STEEL • HOSE & BRAID - SERIES 300 STAINLESS STEEL

Pressure ratingsreflect standardratings. Higherpressures areavailable, pleasecontact factory.

5

M E T R A L OO P S E L E C T I O N C H A R T

EPIPEZIS #LEDOM

-EVOMTNEM

OTDNEDNE HTGNEL

ISPELGNIS

DIARB

ISP†ELBUOD

DIARB

XAMMAETS

.SSERP

GNIRPS*ECROF.SBL

THGIEW.SBL

"2/1 )mm51( 05003WLM05008WLM

"5.1±"4±

"6"9

"31"71

5701 0271 003 545.25

"4/3 )mm02( 57003WLM57008WLM

"5.1±"4±

"4/1-5"4/1-9

"31"81

297 7621 003 745.25

"1 )mm52( 00103WLM00108WLM

"5.1±"4±

"6"01

"51"02

175 419 003 3547

"4/1-1 )mm23( 52103WLM52108WLM

"5.1±"4±

"2/1-7"4/3-01

"61"12

135 058 003 6669

"2/1-1 )mm04( 05103WLM05108WLM

"5.1±"4±

"9"2/1-11

"71"32

274 557 003 07931

"2 )mm05( 00203WLM00208WLM

"5.1±"4±

"21"41

"91"52

005 057 003 873161

"2/1-2 )mm56( 05203WLM05208WLM

"5.1±"4±

"51"2/1-51

"12"82

783 916 003 380262

"3 )mm08( 00303WLM00308WLM

"5.1±"4±

"81"81

"32"03

882 134 612 095393

"4 )mm001( 00403WLM00408WLM

"5.1±"4±

"42"42

"82"53

232 173 681 0218445

"5 )mm521( 00503WLM00508WLM

"5.1±"4±

"03"03

"23"04

1819

"6 )mm051( 00603WLM00608WLM

"5.1±"4±

"63"63

"73"64

561 462 231 202521041

"8 )mm002( 00803WLM00808WLM

"5.1±"4±

"84"84

"84"85

542762

"01 )mm052( 00013WLM00018WLM

"5.1±"4±

"06"06

"55"76

002 072 001 383304434

"21 )mm003( 00213WLM00218WLM

"5.1±"4±

"27"27

"36"47

655685

351 681191 603

512 572 511 062

061 022 49 093

GROOVED ENDS • FITTINGS - SCHED. 40 CARBON STEEL • HOSE & BRAID - SERIES 300 STAINLESS STEEL

EPIPEZIS #LEDOM

-EVOMTNEM

ECAFOT

ECAF HTGNEL

ISPELGNIS

DIARB

ISP†ELBUOD

DIARB

GNIRPS*ECROF.SBL

THGIEW.SBL

"2 )mm05( 00203GLM00208GLM

"5.1±"4±

"81"02

"91"52

005 057 875181

"2/1-2 )mm56( 05203GLM05208GLM

"5.1±"4±

"12"2/1-12

"12"82

3292

"3 )mm08( 00303GLM00308GLM

"5.1±"4±

"42"42

"32"03

882 134 099334

"4 )mm001( 00403GLM00408GLM

"5.1±"4±

"03"03

"82"53

4506

"5 )mm521( 00503GLM00508GLM

"5.1±"4±

"63"63

"23"04

191 603 6819899

"6 )mm051( 00603GLM00608GLM

"5.1±"4±

"24"24

"73"64

531051

"8 )mm002( 00803GLM00808GLM

"5.1±"4±

"65"65

"84"85

512 572 062462682

"01 )mm052( 00013GLM00018GLM

"5.1±"4±

"86"86

"55"76

034164

"21 )mm003( 00213GLM00218GLM

"5.1±"4±

"08"08

"36"47

061 022 093295226

783 916 38

232 173 201

561 462 202

002 072 382

† 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.

METRALOOP OPTIONSThe sizes, pressures and movements shown reflect ourstandard MetraLoops. Higher pressure, greatermovements and special materials, such as all stainlesssteel construction are available. Please contactyour local Metraflex representative or the factory800-621-4347 for more information.

Metraflex reserves the right to change productspecifications, designs and standard equipmentwithout notice and without incurring obligation.

For safe working pressures above 70°F, multiply the pressuresshown at 70°F by the correction factor for the required temperature

ERUTAREPMETF°

ROTCAFNOITCERROC

EZNORBSSELNIATS

LEETS°07 0.1 0.1°002 98. 29.°003 38. 68.°004 87. 28.°005 –– 77.°006 –– 37.

WELD ENDS • FITTINGS - SCHED. 40 CARBON STEEL • HOSE & BRAID - SERIES 300 STAINLESS STEEL

Pressure ratingsreflect standardratings. Higherpressures areavailable, pleasecontact factory.

6

INSTALLATION/GUIDING CONSIDERATIONS

Centered in a pipe run: when the loop is installed in the middle of a pipe run, the loop will flex symmetricallyand the 180 will move toward and away from the pipe. The 180 support should be designed with enough slack toallow the 180 to move 10% of the loops designed movement. For example a loop designed for ± 4 inches of axialmovement will see the 180 return bend move 4 tenths (0.4”) of an inch.

One end anchored: When installed at or near an anchor the 180 will have a lateral component to its movement,in addition to the movement shown above (“Centered in a pipe run”). The lateral movement will be 50% of thethermal expansion or contraction and it will be in the same direction as the pipe movement. Again a sufficientlyslack hanger rod or slide support is all that is required.

Guiding Requirements: Thermal Movement -Being the most flexible component of your pipingsystem, the MetraLoop is the path of least resistance.And unlike other expansion joint devises, bellows,hard pipe loops, ball or slip type joints, the loop willabsorb any thermal expansion before your pipedevelops a tendency to bow out of position. As longas the loops design parameters are not exceeded theloop does not need guides.

However, the Mechanical Contractors Association ofAmerica “Guidelines for Quality Piping Installations”section 3 Pipe Hangers and Supports, suggests toensure movement is directed as expected and if yourpiping is supported on pipe hangers that will swingmore than 4 degrees from vertical when the pipemoves it is recommended that a pipe guide beinstalled anywhere within 15 pipe diameters on eachside of the MetraLoop. Loops anchored on one sideneed only one guide on the traveling side.

Guiding Requirements - Seismic Movement - Whenspanning a buildings seismic expansion joint, guidesare not required. See page 11.

NOTEMOVEMENT

FROMORIGINALPOSITION

CENTERED INA PIPE RUN

ONE ENDANCHORED

SUPPORT STRUCTURE

SUPPORT ANCHORAGE

THREADED ROD

PIPE HANGER

AXIAL MOVEMENT

IF PIPE MOVEMENTWOULD CAUSE THEANGLE TO EXCEED4∞ GUIDES ARERECOMMENDED

DERIUQER'L'MUMINIMSEDIUGETANIMILEOT

LAIXATNEMEVOM

DORHTGNEL'L'

"1 "41"2 "82"4 "75"6 "58

GUIDINGREQUIREMENTS

ORIGINALPOSITION

A2 A1 A1 A3A1

L

7

A P P L I CA T I O N SNESTED METRALOOPS:Nested MetraLoops can be used in parallel piperuns to keep all the expansion or seismicdevices at one location. MetraLoops can benested in any sequence, large inside of smallerdiameters or small inside of large and anynumber of pipes can be made in a nest.

C.S.A./A.G.A. GAS LOOPS:Selected sizes, designs and materials ofconstruction for the MetraLoops have beentested and certified by C.S.A./A.G.A. for use ongas pipe lines. These MetraLoops are beingused primarily in commercial and industrialfacilities located in seismic zones to minimizethe possibility of gas line ruptures. Firescaused by broken gas lines are the major causeof damage after earthquakes.

MEDICAL LOOPS:Many healthcare facilities, especially inseismically rated areas, require flexibility in allpiping systems. Optional cleaning, capping, andcertifying, for all medical gas applicationsincluding medical oxygen, vacuum, andcompressed air. For sealed systems, such asoxygen service, loops are supplied withoutdrain/air release plugs. The Metraloop isaccepted by the California Office of StatewideHealth Planning and Development (OSHPD) foruse in hospitals.

SPRINKLER SEISMIC LOOP:Historically, seismic flexibility in fire sprinklerlines has been accomplished using a complexseries of couplings. The UL listed Fireloop is apre-tested factory warranted seismic expansionjoint that is compact and can be oriented in anydirection. The Fireloop meets NFPA-13standards A-6-4.1 & 4.2 for seismic joints infire sprinkler systems. See catalog Fireloop orwww.metraflex.com for complete information.

MULTIPLE PIPE RUNS

NATURAL GAS LINES

MEDICAL GASES

FIRE SPRINKLERS



information.

®

Catalog LOOP93



®

8

CORNER LOOPS:One Metraloop simultaneously absorbs thethermal expansion of two pipe runs. Space-saving inside corner Metraloop eliminates theneed for an anchor at the corner. Support mustbe provided to prevent Metraloop fromdrooping or torquing pipe and must allow forsufficient movement.

LINED METRALOOPS:Liners are used when flow velocity exceeds 25ft/sec. through the hose assembly or when thefluid is erosive.

A liner will reduce turbulence and pressure dropif this is critical to the application. Spiral woundinterlocked flexible hose is commonly used forthe liner.

CONTAINMENT LOOPS ORSTEAM JACKETED PIPING:Containment MetraLoops for hazardous mediacan be built of almost any compatible material.A large inspection port in the return bend is acommon option. Containment loops can bedesigned for thermal expansion, seismic, tanksettling, nozzle loading requirements, etc. . .

Steam jacketed loops are used to heat or reheatmedia and at the same time absorb orcompensate for thermal movement. Steamconnections can be made anywhere except inthe flexible legs.

SEWAGE (POOP) LOOP:Lined to minimize sediment collection, theseloops are designed with a clean out "T" tofacilitate servicing and to comply with mostcode requirements. The loops are installed inthe sewage lines as they exit a buildingfoundation to allow for building settlement.They are also used in and outside the buildingto accommodate seismic movement.

A P P L I CA T I O N SONE LOOP FOR TWO RUNS

HI VELOCITY SYSTEMS

CONTAINMENT OR STEAM JACKETED PIPING

SEWAGE SYSTEMS

CLEAN OUT ‘T’

9

A P P L I CA T I O N SNOZZLE LOAD LOOPS:Pipe stress and nozzle loading due tosettlement can be eliminated. Use Metraloopson storage tanks, building separations, or anylarge equipment where stress relief is required.One assembly may be used to simultaneouslyabsorb seismic, thermal, and settlementmovements.

ROOF LOOPS:Due to their large forces, most rooftop thermalexpansion devices require penetration of theroof to anchor and support the piping.Metraloops permit the use of wooden sleepersor other similar supports that maintain theintegrity of the roofing material.

BURIED LOOPS:All of the benefits of using The Metraloop forabove ground systems can be applied to buriedsystems as well. The Metraloop will virtuallyeliminate all anchor loads from the systemreducing anchor plate and thrust blockrequirements. The Metraloop will take up 75%less space than conventional hard pipe loopslowering excavation cost, and can beincorporated into the design of conduitsystems. The Metraloop will provide anadditional benefit of protecting the pipingsystem and equipment from the effects ofbuilding settling and soil shifting.

TRENCH BOX SYSTEM:Requiring a fraction of the space of hard pipeloops, excavation and dirt disposal areminimized using the Metraloop. Rack supportsusing pipe rollers or slide supports are ideal forthe pipe runs.

STORAGE TANKS

ROOF TOP PIPING

BURIED LOOPUNDERGROUND PIPING

TRENCH BOX SYSTEMS

10

T H E RMAL EXPANS ION APP L ICAT IONS

The Metraloop is an inexpensive alternative to other methodsof designing for thermal expansion such as bellows-typeexpansion joints, slip-type (packed) expansion joints or hard-pipe loops.

System costs are reduced because the Metraloop exerts onlya fraction of the anchor loads of all other type expansionjoints. And, due to it's natural flexibility, the Metralooprequires far fewer pipe guides than are required for bellowsexpansion joints and takes up less space than a hard-pipeloop. (See inside front cover for anchor load and spacecomparisons.)

Metraloops reduce the entire cost of the system in three ways:

* Reduce Anchor Costs - Smaller anchor loads means smaller,less expensive anchors. No expensive thrust blocks or heavy-duty main anchors are required.

* Reduce Guiding Costs - Only two pipe guides are requiredper Metraloop. Compared to the stringent requirements of otherexpansion joints, this can add up to a considerable savings.

* Reduce Construction Material Costs - Metraloops requiremuch less space than hard pipe loops. That means smallervaults when digging steam trenches, less concrete and less dirtfor removal.

For a video demonstration of the MetraLoop,contact your local Metraflex representative,or call 800-621-4347.

APPL ICATIONS

BENEF ITSDES IGN CONS IDERATIONS

METRALOOP

Metraloops can be used in any thermal expansion application.Virtually any amount of movement is available.

Steel Pipe - Metraloops are available in flanged, weld, or groovedor any combination to suit the system requirements.

Stainless Steel Pipe - For corrosive or seawater applications, allstainless steel construction is available.

Copper Pipe - The column strength of small diameter copper pipe isvery low. Bellows type copper compensators require many pipeguides to maintain column strength. Metraloops exert no pressurethrust on the pipe reducing this requirement.

Plastic Pipe- Typically has much greater coefficients of expansionthan either copper or steel and is more brittle. Again, the Metraloopwith its low spring rate is ideal.

The best configuration to accommodate thermal expansion isthe Metraloop. When the loop is installed in a pipe run thatis expanding or contracting axially, the flexible legs, beingperpendicular to the movement vector, are flexed laterally. Aslong as the legs are designed with sufficient live length theoffset amount never exceeds the elastic limit of the hose and itwill flex indefinitely.

In hot and cold water systems, Metraloops may be installed inany orientation relative to the piping and at any locationalong the pipe run. The pipes expansion or contraction willfind it's way to the Metraloop. Due to the loops ability toaccommodate large amounts of movement, it should belocated in such a way as to limit stress on branch lines.

In steam systems, care must be taken to prevent condensatebuild up that could be harmful to other componentsdownstream of the loop. For this reason we require steamMetraloops to be oriented horizontally. (See page 3,Illustration #1). Vertical steam risers do not apply. As anadditional safety precaution all steam loops are doublebraided. Please specify service when ordering.

Flexible stainless steel hose and braid is an excellent product for absorbing lateral offset and angular movement. It is not well suited foraxial compression, or torque. Under axial compression the braid is relaxed which lowers the pressure rating, and torque introduces complexstresses that quickly fatigue the hose.

With the above in mind, if hose and braid is to be used as the stress relieving, movement compensating component of a piping system itmust be installed in a configuration that minimizes the axial compression of the hose and braid.

EXPANSION CONTRACTION



information.

®

Catalog LOOP93



®

11

BENEFITSThe Metraloop is a better alternative to other methodsof designing for seismic movement such as dual-tiedbellows expansion joints, or ball-joints.

System costs are reduced because the Metraloopexerts only a fraction of the anchor loads of a ball-jointor a bellows expansion joint. That means no expensivethrust blocks or heavy-duty anchors are required. (SeeInside Front Cover for anchor load comparison)

The extreme flexibility of the Metraloop also makes itideal as a seismic connector to equipment such asboilers, chillers, and fan-coil units. Metraloopsminimize equipment nozzle loading conditions.

DESIGN CONSIDERATIONSThe randomness of themovement in an earthquakerequires that seismic expansionjoints be capable of movementin any direction. Of all the sixpossible directions ±X, ±Y, ±Z(Figure 1) the Metraloop is theoptimal configuration ascompared with other type offlexible hose and braid seismic connectors. By design,flexible hose and braid connectors are limited toangular motion and lateral offset. Axial, compressive,or torsional movement is not possible. By fabricatingan assembly with two sections of hose parallel to eachother, and allowing the 180° return bend to movefreely, the Metraloop minimizes the likelihood ofcompressive movement.

For movement in the +X, -X & planes (expansion &contraction), the Metraloop uses hose offset motion toachieve this movement. Also for movement in the +Z,-Z planes (front & back), the Metraloop uses hoseoffset motion. Movement in the +Y, -Y Plane (up-down), the legs of the Metraloop use hose angularmotion for this movement.

Note: The use of assemblies with flexible hose sectionsoriented at 90° relative to each other can result in axialcompression or torque of the hose. This may result infailure or shorter service life of the assembly. A non-structural disadvantage of these types ofconfigurations is the cost and logistics of thenecessary offsets in the pipe runs or additionalsupports required.

APPLICATIONSMetraloops can be used in all types of systemsincluding steam, hot or chilled water, medical gas,natural gas (See A.G.A./C.S.A. certified drawing, page16), fire sprinklers, sewage, chemical, and petroleumproducts. Special applications requiring lined hose forhigh velocity, double-braid for high pressures, and allstainless steel construction for media compatibility areavailable (See pages 7-9 for a few of these specialapplications.

SEISMIC INSTALLATIONFigures 2 thru 4 show typical installations ofMetraloops for seismic service. These drawings, alongwith detailed installation instructions for seismicapplications can be found on our website and bycontacting your local Metraflex representative.

S E I S M I C A P P L I CA T I O N SFIGURE 2 - CROSSING A BUILDING SEISMIC JOINT - HORIZONTAL

FIGURE 3 - CROSSING A BUILDING SEISMIC JOINT - VERTICAL

FIGURE 4 - RISER APPLICATION

-Z

-X

-Y

+Z

+X

+Y

UP

FRONT

BACKRIGHT

LEFTDOWN

FIGURE 1

WJE was commissioned to perform cycle testing on 4",6", and 8" diameter MetraLoops simulating themovement that would be expected in an earthquake. AllMetraLoops which were submitted passed the cycletesting.

Description of test procedure and equipment:MetraLoops designed for 4 inches of movement in anydirection were pressurized and mounted between twocarts. The carts moved perpendicular to each other andwere set to simultaneously cycle at +4 inches and -4inches at a rate of 2 cycles per second for 30 cycles.After 30 cycles, none of the MetraLoops showed anysigns of stress, damage or fatigue.

After the successful completion of the original test, a 4-inch diameter MetraLoop was subjected toprogressively larger amplitudes of movement untilfailure. First for 30 cycles at ±6 inches and then ±8 inches (100% above design movement). At 100%above design movement, the MetraLoop started to leak.

The full test report and a video of the testing is availableupon request, please contact the factory.

12

SUMMARY OF T H E T E S T R E POR T O F W I S S ,JANNEY, E L S TN ER A S SOC IAT E S , I NC .NOR THBROOK , I L

METRALOOP CYCLE TEST ING WJE TEST NO. 941166

13

PR E S SUR E DROP CHAR T S1/2” TO 16” D IAMETER METRALOOPSBecause of their compact size MetraLoops have a lower pressure drop than the same movement hard pipe loop. The pressure drops

note on these charts are the standard MetraLoops designed for ± 4 inches of movement.

CUSTOMER __________________________________

PROJECT ____________________________________

ENGINEER ___________________________________

ARCHITECT __________________________________

PRO. OR P.O. NO ______________________________

DESCRIPTION:

DRAWN BY: DATE: DRAWING NO:

www.metraflex.com ©THE METRAFLEX CO. 2002, All rights reserved

Chicago, IL

14

JRR 11/02 ML02

METRALOOPTM

U.S. PAT# 5,195,784

.YTQ EZIS #LEDOMLAIXA

TNEMEVOM A BISP

F°07@ SETON

A90° ELBOW

SHIPPINGBAR

HOSE &BRAID

180° RETURN

AIR RELEASEOR DRAIN PLUG SUPPORT BRACKET

B

FEMALECOPPER SWEAT

MALETHREADS

WELD

GROOVED

MATERIALSOF

CONSTRUCTION

End Fittings

Hose & Braid

90° Elbow

180° Return

NOTE: METRALOOPS 2” AND LARGER INSTALLED IN ANY ORIENTATION OTHER THAN HANGING DOWNMUST HAVE THE 180° RETURN SUPPORTED. (SEE INSTALLATION INSTRUCTIONS.)

ALL DIMENSIONS IN INCHES

www.metraflex.com ©THE METRAFLEX CO. 2002, All rights reserved 15

CUSTOMER __________________________________

PROJECT ____________________________________

ENGINEER ___________________________________

ARCHITECT __________________________________

PRO. OR P.O. NO ______________________________

DESCRIPTION:


Chicago, IL

JRR 11/02 MLNST

METRALOOP NESTU.S. PAT# 5,195,784

A1A2

CL

B 1

CL

C 1

B 2

A3

CL

C 2

B 3

A4

CL

C 3

B 4

TAG INFO

NEST LOCATION & NOTES

POOL#

EPIPEZIS

DNEGNITTIF

TNEMEVOM XAMECIVRES

PMET/ISP

LUSNIKCIHT

YROTCAFYBDEILPPUSSNOISNEMID

ECNATSIDEPIPNEEWTEB

CIMSIESLLA

SNOITCERID

LAIXA ALAO

BOTEPIPFORETNEC

POOLFOMOTTOB-RPMOC

NOISSE-NETXE

NOIS

1 A 1 B 1C 1

2 A 2 B 2C 2

3 A 3 B 3C 3

4 A 4 B 4

MISC. LOOP NOTES: There is no limit to the number of loops in a nest. Any sequence of pipe diameters is acceptable. Loops donot have to “hang down” as illustrated; up, down, sideways is acceptable.

SEDIUGEPIP

ROF#POOL EZIS .YTQ #LEDOM SETON

1

2

3

4

CUSTOMER __________________________________

PROJECT ____________________________________

ENGINEER ___________________________________

ARCHITECT __________________________________

PRO. OR P.O. NO ______________________________

DESCRIPTION:


www.metraflex.com ©THE METRAFLEX CO. 1993, All rights reserved

Chicago, IL

16

JRR 8/25/93 LOOP-GAS

METRALOOP®

EXPANSION JOINT / SEISMICCONNECTOR FOR GAS SERVICE

.ytQ eziSA

daerhT/dleWB

*tnemevoM .xaMgnikroWerusserP

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"2/1 "51 "81 "4 "4-/+ 051 "2/1

"4/3 "4/1-51 "02 "4 "4-/+ 051 "2/1

"1 "61 "22 "4 "4-/+ 051 "8/5

"4/1-1 "4/3-61 "22 "4 "4-/+ 051 "8/5

"2/1-1 "2/1-71 "32 "4 "4-/+ 051 "8/5

"2 "02 "52 "4 "4-/+ 051 "8/5

"2/1-2 "2/1-12 "62 "4 "4-/+ 051 "8/5

"3 "62 "92 "4 "4-/+ 051 "8/5

"4 "23 "73 "4 "4-/+ 051 "8/5

A

SHIPPINGBAR

B

*MOVEMENT IS FROM ‘A’ DIMENSION. DO NOT TORQUE. CONTACT FACTORY FOR INSTALLATION INSTRUCTIONS.

SCH. 40 L. R. 90°

STAINLESS STEELHOSE AND BRAID

SCH. 40 180°

DRAIN SUPPORT BRACKET

STANDARD MATERIALSOF CONSTRUCTIONHOSE & BRAID - T304 S/SFITTINGS - CARBON STEELOPTIONS - ALL S/S CONSTRUCTION

U.S. PAT# 5,195,784



information.

®

Catalog LOOP93



®

END FITTING

SCH. 40 MPT

OR

SCH. 40 BEVELEDFOR WELDING

17

T E R M S A N D C O N D I T I O N S

1. All quotations are subject to approval, acceptance andcorrection at the home office. Any errors in quotationsresulting in orders will be corrected and submitted to thecustomer for their acceptance or refusal.

No prices may be made up from information other thanthat shown in the tables.

2. All prices are F.O.B. factory, Chicago, Illinois, and arequoted exclusive of any taxes.

Shipments boxed for trans-ocean export, add 10% to totaltrade prices.

Terms: Net 30 days from date of invoice.

3. Cancellation or alteration of an order or return of anyproduct by Buyer may not be made without advancewritten consent of manufacturer and shall be subject to acancellation charge. Custom products are not returnable.

A 30% minimum restocking charge shall be placed on anyreturned goods, or a $25.00 charge (whichever isgreater).

4. We will not be responsible for delays in shipping dueto conditions beyond our control such as strikes, fires, oraccidents.

5. Any claims for shortages or damaged products must bemade in writing within 10 days after receipt of shipment.

6. Prices subject to change without notice.

Design and DimensionalSpecifications

The products illustrated reflect the design characteristics attime of printing.

Metraflex reserves the right to change dimensions,material, or methods of construction without notice. Pleasecontact the factory for certified prints (exact dimensions)when necessary.

Limited Warranty

All products are warranted to be free of defects in materialand workmanship for a period of one year from the date ofshipment, subject to the limitations below.

If the purchaser believes a product is defective the purchasershall: (a) Notify the manufacturer, state the alleged defect and request permission to return the product. (b) If permission is given, return the product with transportationprepaid. If the product is accepted for return and found to be defective, the manufacturer will, at its discretion, eitherrepair or replace the product, F.O.B. factory, within 60 daysof receipt, or refund the purchase price. Other than to repair,replace or refund as described above, purchaser agrees that manufacturer shall not be liable for any loss, costs, expenses or damages of any kind arising out of the product,

its uses, installation or replacement, labeling, instructionsinformation or technical data of any kind, description ofproduct or use, samples or model, warnings or lack of any ofthe foregoing. NO OTHER WARRANTIES, WRITTEN ORORAL, EXPRESS OR IMPLIED, INCLUDING THEWARRANTIES OF FITNESS FOR A PARTICULAR PURPOSEAND MERCHANTABILITY, ARE MADE OR AUTHORIZED.NO AFFIRMATION OF FACT, PROMISE, DESCRIPTIONOF PRODUCT OF USE OR SAMPLE OR MODEL SHALLCREATE ANY WARRANTY FROM MANUFACTURER,UNLESS SIGNED BY THE PRESIDENT OFMANUFACTURING. These products are notmanufactured, sold or intended for personal, family orhousehold purposes.

2323 W. HUBBARD ST. • CHICAGO, IL 60612 • 312-738-3800 • FAX 312-738-0415 • http://www.metraflex.com

Call or write for information onany of these other

METRAFLEX PRODUCTS

Distributed by:

Catalog LOOP 08 © THE METRAFLEX COMPANY, 2004. All rights reserved. Printed in U.S.A.

• METAL BELLOWS EXPANSION JOINTS

• GUIDES, SLIDES AND ANCHORS

• HI RISE COMPENSATOR

• FLEXIBLE METAL HOSE • SILENT CHECK VALVES • METRAGATOR EXPANSION JOINTS

• CAST IRON STRAINERS • HIGH PERFORMANCE • METRASEAL

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