23 05 48.19 - SEISMIC BRACING FOR HVAC.pdf

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SEI SMI C BRACI NG FOR HVAC

05/ 18

PART 1 GENERAL

1. 1 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.

AMERI CAN CONCRETE I NSTI TUTE ( ACI )

ACI 355. 2 ( 2007) Qual i f i cat i on of Post - I nst al l ed Mechani cal Anchor s i n Concr et e and Comment ar y

ACI 355. 4 ( 2011) Qual i f i cat i on of Post - I nst al l ed Adhesi ve Anchor s i n Concr et e ( ACI 355. 4) and Comment ar y

AMERI CAN SOCI ETY OF CI VI L ENGI NEERS ( ASCE)

ASCE 7- 16 ( 2017; Er r at a 2018; Supp 1 2018) Mi ni mum Desi gn Loads and Associ at ed Cr i t er i a f or Bui l di ngs and Ot her St r uct ur es

ASTM I NTERNATI ONAL ( ASTM)

ASTM A36/ A36M ( 2019) St andar d Speci f i cat i on f or Car bon St r uct ur al St eel

ASTM A53/ A53M ( 2022) St andar d Speci f i cat i on f or Pi pe, St eel , Bl ack and Hot - Di pped, Zi nc- Coat ed, Wel ded and Seaml ess

ASTM A153/ A153M ( 2023) St andar d Speci f i cat i on f or Zi nc Coat i ng ( Hot - Di p) on I r on and St eel Har dwar e

ASTM A325 ( 2014) St andar d Speci f i cat i on f or St r uct ur al Bol t s, St eel , Heat Tr eat ed, 120/ 105 ksi Mi ni mum Tensi l e St r engt h

ASTM A490 ( 2014a) St andar d Speci f i cat i on f or St r uct ur al Bol t s, Al l oy St eel , Heat Tr eat ed, 150 ksi Mi ni mum Tensi l e St r engt h

ASTM A500/ A500M ( 2023) St andar d Speci f i cat i on f or Col d- For med Wel ded and Seaml ess Car bon St eel St r uct ur al Tubi ng i n Rounds and Shapes

ASTM A563 ( 2021; E 2022a) St andar d Speci f i cat i on f or Car bon and Al l oy St eel Nut s

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Addendum #02 09/16/2024

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ASTM A603 ( 2019) St andar d Speci f i cat i on f or Zi nc- Coat ed St eel St r uct ur al Wi r e Rope

ASTM F1554 ( 2020) St andar d Speci f i cat i on f or Anchor Bol t s, St eel , 36, 55, and 105- ksi Yi el d St r engt h

METAL FRAMI NG MANUFACTURERS ASSOCI ATI ON ( MFMA)

MFMA- 4 ( 2004) Met al Fr ami ng St andar ds Publ i cat i on

SHEET METAL AND AI R CONDI TI ONI NG CONTRACTORS' NATI ONAL ASSOCI ATI ON

( SMACNA)

SMACNA 1981 ( 2008) Sei smi c Rest r ai nt Manual Gui del i nes f or Mechani cal Syst ems, 3r d Edi t i on

U. S. DEPARTMENT OF DEFENSE ( DOD)

UFC 3- 301- 01 ( 2023; wi t h Change 1, 2023) St r uct ur al Engi neer i ng

UFC 4- 010- 01 ( 2018) DoD Mi ni mum Ant i t er r or i sm St andar ds f or Bui l di ngs

VI BRATI ON I SOLATI ON AND SEI SMI C CONTROL MANUFACTURERS ASSOCI ATI ON

( VI SCMA)

VI SCMA 412 ( 2014) I nst al l i ng Sei smi c Rest r ai nt s f or Mechani cal Equi pment

1. 2 SYSTEM DESCRI PTI ON

1. 2. 1 Gener al Requi r ement s

Appl y t he r equi r ement s f or sei smi c pr ot ect i on measur es descr i bed i n t hi s sect i on and on t he dr awi ngs t o t he mechani cal equi pment and mechani cal syst ems bot h i nsi de and out si de of t he bui l di ng al ong wi t h ext er i or ut i l i t i es and syst ems l i s t ed bel ow. Wher e t her e i s a conf l i c t bet ween t he speci f i cat i ons and t he dr awi ngs, t he speci f i cat i ons wi l l t ake pr ecedence.

Accompl i sh r esi st ance t o l at er al f or ces i nduced by ear t hquakes wi t hout consi der at i on of f r i c t i on r esul t i ng f r om gr avi t y l oads.

1. 2. 2 Mechani cal Equi pment

Mechani cal equi pment t o be sei smi cal l y pr ot ect ed must i ncl ude, but not be l i mi t ed t o, t he f ol l owi ng i t ems t o t he ext ent r equi r ed on t he dr awi ngs or i n ot her sect i ons of t hese speci f i cat i ons:

Boi l er s Ai r Handl i ng Uni t s

Domest i c Wat er Heat Exchanger Expansi on Ai r Separ at or Tanks

Ther mal St or age Uni t s Val ves and Fi t t i ngs f or Pi pi ng

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Comput er Room Ai r Condi t i oner s Pumps wi t h Mot or s

Uni t Heat er s Exhaust , Ret ur n and Mi sc. Fans

Ai r Ter mi nal Uni t s Fan Coi l Uni t s

Humi di f i er s I nst r ument at i on and Cont r ol f or HVAC

St acks Duct Si l encer s

Ai r Duct s Sani t ar y and Wast e Pi pi ng

Uni t Heat er s Hydr oni c and Domest i c Wat er , Gas Pi pi ng

1. 2. 3 Mechani cal Syst ems

Mechani cal syst ems t o be sei smi cal l y pr ot ect ed must i ncl ude t he f ol l owi ng i t ems t o t he ext ent r equi r ed on t he dr awi ngs or i n t hi s or ot her sect i ons of t hese speci f i cat i ons:

a. Al l Pi pi ng and Duct s I nsi de t he Bui l di ng Except as Speci f i cal l y St at ed i n Ar t i c l e " I t ems Not Cover ed By Thi s Sect i on" .

b. Chi l l ed Wat er Di st r i but i on Syst ems.

c. Gas Pi pi ng Out si de of Bui l di ngs.

d. Al l Wat er Suppl y Syst ems.

e. St or m and Sani t ar y Sewer Syst ems.

f . Al l Pr ocess Pi pi ng.

g. Heat i ng Wat er Di st r i but i on Syst ems.

h. St acks.

1. 2. 4 Cont r act or Desi gned Br aci ng

Submi t copi es of t he desi gn cal cul at i ons wi t h t he dr awi ngs. Cal cul at i ons must be appr oved, cer t i f i ed, st amped and si gned by a r egi st er ed Pr of essi onal St r uct ur al Engi neer . Cal cul at i ons must ver i f y t he capabi l i t y of st r uct ur al member s t o whi ch br aci ng i s at t ached f or car r y i ng t he l oad f r om t he br ace. Desi gn t he br aci ng i n accor dance wi t h UFC 3- 301- 01, UFC 4- 010- 01 and addi t i onal dat a f ur ni shed by t he Cont r act i ng Of f i cer .

Resi st ance t o l at er al f or ces i nduced by ear t hquakes must be accompl i shed wi t hout consi der at i on of f r i c t i on r esul t i ng f r om gr avi t y l oads.

UFC 3- 301- 01 uses par amet er s f or t he bui l di ng, not f or t he equi pment i n t he bui l di ng; t her ef or e, cor r espondi ng adj ust ment s t o t he f or mul as must be r equi r ed. Loadi ngs det er mi ned usi ng UFC 3- 301- 01 ar e based on st r engt h desi gn. Pr ovi de sei smi c br aci ng desi gn dr awi ngs and engi neer i ng cal cul at i ons f or equi pment and syst ems l i s t ed i n t hi s speci f i cat i on and as r equi r ed by t he cont r act document s.

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1. 2. 5 I t ems Not Cover ed By Thi s Sect i on

1. 2. 5. 1 Fi r e Pr ot ect i on Syst ems

I nst al l sei smi c pr ot ect i on of pi pi ng f or f i r e pr ot ect i on syst ems as speci f i ed i n Sect i on 21 13 13. 00 10 WET PI PE SPRI NKLER SYSTEM, FI RE

PROTECTI ON.

1. 2. 5. 2 I t ems Requi r i ng No Sei smi c Rest r ai nt s

Sei smi c r est r ai nt s ar e not r equi r ed f or t he f ol l owi ng i t ems:

a. Gas pi pi ng l ess t han 1 i nch nomi nal pi pe s i ze.

b. Pi pi ng i n boi l er and mechani cal equi pment r ooms l ess t han 1- 1/ 4 i nches nomi nal pi pe s i ze.

c. Al l ot her pi pi ng equal t o or l ess t han 3i nches nomi nal pi pe s i ze.

d. Rect angul ar ai r handl i ng duct s l ess t han 6 squar e f eet i n cr oss sect i onal ar ea.

e. Round ai r handl i ng duct s l ess t han 28 i nches i n di amet er .

f . Pi pi ng suspended by i ndi v i dual hanger s 12 i nches or l ess i n l engt h f r om t he t op of pi pe t o t he bot t om of t he suppor t i ng st r uct ur al member wher e t he hanger i s at t ached, except as not ed bel ow.

g. Duct s suspended by hanger s 12 i nches or l ess i n l engt h f r om t he t op of t he duct t o t he bot t om of t he suppor t i ng st r uct ur al member , except as not ed bel ow.

I n exempt i ons f . and g. al l hanger s must meet t he l engt h r equi r ement s. I f t he l engt h r equi r ement i s exceeded by one hanger i n t he r un, br ace t he ent i r e r un. Sei smi cal l y pr ot ect i nt er i or pi pi ng and duct s not l i s t ed above i n accor dance wi t h t he pr ovi s i ons of t hi s speci f i cat i on.

1. 3 SUBMI TTALS

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" desi gnat i on;

submi t t al s not havi ng a " G" desi gnat i on ar e f or i nf or mat i on onl y. When used, a desi gnat i on f ol l owi ng t he " G" desi gnat i on i dent i f i es t he of f i ce t hat wi l l r evi ew t he submi t t al f or t he Gover nment . Submi t t al s wi t h an " S" ar e f or i ncl usi on i n t he Sust ai nabi l i t y eNot ebook, i n conf or mance t o Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. When shown i n t hi s speci f i cat i on, det ai l ed shop dr awi ngs f or al l r equi r ed equi pment , pi pi ng and duct wor k wi t h cal cul at i ons cer t i f i ed by a r egi st er ed st r uct ur al engi neer wi l l be pr ovi ded. Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00 SUBMI TTAL PROCEDURES:

SD- 02 Shop Dr awi ngs

Coupl i ng and Br aci ng

Fl exi bl e Coupl i ngs or Joi nt s

Equi pment Rest r ai nt

Cont r act or Desi gned Br aci ng ( I ncl udi ng Cal cul at i ons) ; G

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SD- 03 Pr oduct Dat a

Coupl i ng and Br aci ng; G

Equi pment Rest r ai nt ; G

Cont r act or Desi gned Br aci ng ( I ncl udi ng Cal cul at i ons) ; G

Vi br at i on I sol at or s

SD- 05 Desi gn Dat a

Desi gn Cal cul at i ons

PART 2 PRODUCTS

2. 1 GENERAL DESI GN REQUI REMENTS

Submi t det ai l ed sei smi c r est r ai nt dr awi ngs f or mechani cal equi pment , duct syst ems, pi pi ng syst ems and any ot her mechani cal syst ems al ong wi t h cal cul at i ons, cat al og cut s, t empl at es, and er ect i on and i nst al l at i on det ai l s, as appr opr i at e, f or t he i t ems l i s t ed bel ow. I ndi cat e t hi ckness, t ype, gr ade, c l ass of met al , and di mensi ons; and show const r uct i on det ai l s, r ei nf or cement , anchor age, and i nst al l at i on wi t h r el at i on t o t he bui l di ng const r uct i on. Cal cul at i ons must be st amped, by a r egi st er ed st r uct ur al engi neer , and ver i f y t he capabi l i t y of st r uct ur al member s t o whi ch br aci ng i s at t ached f or car r y i ng t he l oad f r om t he br ace. I ncl ude dr awi ng f or Mi ssi on Cr i t i cal Equi pment i ndi cat i ng t he equi pment l ocat i on i n t he f aci l i t y suf f i c i ent t o be used f or t he i nst al l at i on. Desi gn must be based on act ual equi pment and syst em l ayout . Desi gn must i ncl ude cal cul at ed dead l oads, st at i c sei smi c l oads and capaci t y of mat er i al s ut i l i zed f or t he connect i on of t he equi pment or syst em t o t he st r uct ur e.

Anal ysi s must det ai l anchor i ng met hods.

2. 2 EQUI PMENT RESTRAI NT

Equi pment must be r i gi dl y or f l exi bl y mount ed as i ndi cat ed i n t he speci f i cat i ons and/ or dr awi ngs dependi ng on vi br at i on i sol at i on r equi r ement s as f ol l ows bel ow.

Roof mount ed equi pment , bot h v i br at i on i sol at ed and noni sol at ed, must have suppor t member s desi gned and anchor ed t o bui l di ng st r uct ur al st eel or concr et e as r equi r ed f or sei smi c r est r ai nt and wi nd l oads.

2. 2. 1 Ri gi dl y ( Base and Suspended) Mount ed Equi pment

HVAC equi pment f ur ni shed under t hi s cont r act must be r i gi dl y mount ed i n accor dance wi t h ACI 355. 2 and ACI 355. 4. Anchor bol t s must conf or m t o ASTM F1554. For any r i gi d equi pment whi ch i s r i gi dl y anchor ed, pr ovi de f l exi bl e j oi nt s f or pi pi ng, duct wor k, el ect r i cal condui t , et c. , t hat ar e capabl e of accommodat i ng di spl acement s equal t o t he f ul l wi dt h of t he j oi nt i n bot h or t hogonal di r ect i ons. Suspended equi pment br aci ng at t achment s shoul d be l ocat ed j ust above t he cent er of gr avi t y t o mi ni mi ze swi ngi ng. Use t he r at i o of t he over t ur ni ng moment f r om sei smi c f or ces t o t he r esi st i ng moment due t o gr avi t y l oads t o det er mi ne i f over t ur ni ng f or ces need t o be consi der ed i n t he s i z i ng of anchor bol t s. Pr ovi de cal cul at i ons t o ver i f y t he adequacy of t he anchor bol t s f or combi ned shear

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Roof mount ed HVAC equi pment r oof cur bs, f r ami ng and at t achment t o equi pment and st r uct ur e must be desi gned and br aced t o wi t hst and sei smi c l oads. Desi gnat ed Sei smi c Syst ems ( DSS) assi gned t o Sei smi c Desi gn Cat egor y ( SDC) C, D, E, or F and Ri sk Cat egor y I V component s needed f or cont i nued oper at i on af t er an ear t hquake must have t wo nut s pr ovi ded on each anchor bol t .

2. 2. 2 Nonr i gi d or Fl exi bl y- Mount ed Equi pment

Sel ect v i br at i on i sol at i on devi ces so t hat t he maxi mum movement of equi pment f r om t he st at i c def l ect i on poi nt i s 1/ 4 i nch. Equi pment f l exi bl y mount ed on vi br at i on i sol at or s must have a bumper r est r ai nt or snubber i n each hor i zont al di r ect i on and ver t i cal r est r ai nt s must be pr ovi ded wher e r equi r ed t o r esi st over t ur ni ng. I sol at or housi ng and r est r ai nt s must be const r uct ed of duct i l e mat er i al s. A v i scoel ast i c pad or s i mi l ar mat er i al of appr opr i at e t hi ckness must be used bet ween t he bumper and component s t o l i mi t t he i mpact l oad. Rest r ai nt s must be desi gned t o r esi st t he cal cul at ed hor i zont al l at er al and ver t i cal f or ces.

Spr i ng v i br at i on i sol at or s must be sei smi cal l y r at ed, r est r ai ned i sol at or s f or equi pment subj ect t o l oad var i at i ons and l ar ge ext er nal f or ces. The sei smi cal l y r at ed housi ng must be si zed t o meet or exceed t he f or ce r equi r ement s appl i cabl e t o t he pr oj ect and meet t he r equi r ed i sol at i on cr i t er i a. Spr i ng v i br at i on i sol at or manuf act ur er ' s wi l l be a member of VI SCMA. Desi gn f or ce, Fp, must be doubl ed f or v i br at i on i sol at or s wi t h an ai r gap gr eat er t han 0. 25 i nches as speci f i ed i n ASCE 7- 16, Chapt er 13.

Housed spr i ngs must not be used f or sei smi c r est r ai nt appl i cat i ons because t hey cannot r esi st upl i f t .

2. 3 BOLTS AND NUTS

Hex head bol t s, and heavy hexagon nut s must be ASTM A325 or ASTM A490 bol t s and ASTM A563 nut s. Pr ovi de bol t s and nut s gal vani zed i n accor dance wi t h ASTM A153/ A153M when used under gr ound or exposed t o weat her .

2. 4 FLEXI BLE JOI NTS

Fl exi bl e j oi nt s must have same pr essur e and t emper at ur e r at i ngs as adj oi ni ng pi pe. Br ai ded hoses must not be used wher e t her e i s t or s i onal or axi al movement unl ess manuf act ur er al l ows i t .

2. 5 SWAY BRACI NG MATERI ALS

Mat er i al used f or member s l i s t ed i n Cont r act Document s, must be st r uct ur al st eel conf or mi ng wi t h t he f ol l owi ng:

a. Pl at es, r ods, and r ol l ed shapes, ASTM A36/ A36M.

b. Wi r e r ope, ASTM A603 pr e- st r et ched. Cl ass B gal v coat i ng Fer r ul e c l amps must be qual i f i ed by t est i ng f or use i n sei smi c appl i cat i ons per VI SCMA 412. A mi ni mum of t wo cl amps ar e r equi r ed on each end of wi r e r ope.

c. Tubes, ASTM A500/ A500M, Gr ade B.

d. Pi pes, ASTM A53/ A53M, Gr ade B.

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e. Angl es, ASTM A36/ A36M.

f . Channel s ( St r ut s) wi t h i n- t ur ned l i ps and associ at ed har dwar e f or f ast eni ng t o channel s at r andom poi nt s conf or mi ng t o MFMA- 4

PART 3 EXECUTI ON

3. 1 COUPLI NG AND BRACI NG

a. Submi t det ai l dr awi ngs, as speci f i ed her e and t hr oughout t hi s speci f i cat i on, al ong wi t h cat al og cut s, t empl at es, and er ect i on and i nst al l at i on det ai l s, as appr opr i at e, f or t he i t ems l i s t ed.

Submi t t al s must be compl et e i n det ai l ; must i ndi cat e t hi ckness, t ype, gr ade, c l ass of met al , and di mensi ons; and must show const r uct i on det ai l s, r ei nf or cement , anchor age, and i nst al l at i on wi t h r el at i on t o t he bui l di ng const r uct i on.

b. Pr ovi de coupl i ng i nst al l at i on conf or mi ng t o t he det ai l s shown on t he dr awi ngs. Pr ovi s i ons of t hi s par agr aph appl y t o al l pi pi ng wi t hi n a 5 f oot l i ne ar ound out si de of bui l di ng unl ess bur i ed i n t he gr ound.

Pi pi ng gr ouped f or suppor t on t r apeze- t ype hanger s must be br aced at t he most f r equent i nt er val as det er mi ned by appl y i ng t he r equi r ement s of t hi s speci f i cat i on t o each pi pi ng r un on t he common suppor t .

c. Si ze br aci ng component s as r equi r ed f or t he t ot al l oad car r i ed by t he common suppor t s. Br aci ng r i gi dl y at t ached t o pi pe f l anges, or s i mi l ar , must not be used wher e i t woul d i nt er f er e wi t h t her mal expansi on of pi pi ng.

d. Adj ust i sol at or s and r est r ai nt s af t er pi pi ng syst ems has been f i l l ed and equi pment i s at i t s oper at i ng wei ght , f ol l owi ng t he manuf act ur er ' s wr i t t en i nst r uct i ons.

e. I nst al l cabl es at a 45- degr ee sl ope. Wher e i nt er f er ence i s pr esent , t he s l ope may be mi ni mum of 30 degr ees or a maxi mum of 60 degr ees per

VI SCMA 412.

3. 2 BUI LDI NG DRI FT

Pr ovi de j oi nt s capabl e of accommodat i ng sei smi c di spl acement s f or ver t i cal pi pi ng bet ween f l oor s of t he bui l di ng, wher e pi pes pass t hr ough a bui l di ng sei smi c or expansi on j oi nt , or wher e r i gi dl y suppor t ed pi pes connect t o equi pment wi t h v i br at i on i sol at or s. Pr ovi de hor i zont al pi pi ng acr oss expansi on j oi nt s t o accommodat e t he r esul t ant of t he dr i f t s of each bui l di ng uni t i n each or t hogonal di r ect i on. For t hr eaded pi pi ng, pr ovi de swi ng j oi nt s made of t he same pi pi ng mat er i al . For pi pi ng wi t h manuf act ur ed bal l j oi nt s t he sei smi c dr i f t must be 0. 0198 f eet per f oot of hei ght above t he base wher e t he sei smi c separ at i on occur s; t hi s dr i f t val ue must be used i n pl ace of t he expansi on gi ven i n t he manuf act ur er ' s sel ect i on t abl e.

3. 3 FLEXI BLE COUPLI NGS OR JOI NTS

3. 3. 1 Bui l di ng Pi pi ng

Pr ovi de f l exi bl e coupl i ngs or j oi nt s i n bui l di ng pi pi ng at bot t om of al l pi pe r i ser s f or pi pe l ar ger t han 3- 1/ 2 i nches i n di amet er . Lat er al l y br ace f l exi bl e coupl i ngs or j oi nt s wi t hout i nt er f er i ng wi t h t he act i on of t he f l exi bl e coupl i ng or j oi nt . Cast i r on wast e and vent pi pi ng need onl y

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Arrow compl y wi t h t hese pr ovi s i ons when caul ked j oi nt s ar e used. Fl exi bl e bel l and spi got pi pe j oi nt s usi ng r ubber gasket s may be used at each br anch adj acent t o t ees and el bows f or under gr ound wast e pi pi ng i nsi de of bui l di ng t o sat i sf y t hese r equi r ement s.

3. 3. 2 Under gr ound Pi pi ng

I nst al l f l exi bl e coupl i ng i n under gr ound pi pi ng and 4 i nch or l ar ger condui t , except heat di st r i but i on syst em, wher e t he pi pi ng ent er s t he bui l di ng. Pr ovi de coupl i ngs t hat accommodat e 1 i nch of r el at i ve movement bet ween t he pi pe and t he bui l di ng i n any di r ect i on. Pr ovi de addi t i onal f l exi bl e coupl i ngs wher e shown on t he dr awi ngs.

3. 4 PI PE SLEEVES

Si ze pi pe sl eeves i n i nt er i or non- f i r e r at ed wal l s as i ndi cat ed on t he dr awi ngs t o pr ovi de cl ear ances t hat wi l l per mi t di f f er ent i al movement of pi pi ng wi t hout t he pi pi ng st r i k i ng t he pi pe sl eeve. Pi pe sl eeves i n f i r e r at ed wal l s must conf or m t o t he r equi r ement s i n Sect i on 07 84 00

FI RESTOPPI NG.

3. 5 SPREADERS

Pr ovi de spr eader s bet ween adj acent pi pi ng r uns t o pr event cont act dur i ng sei smi c act i v i t y whenever pi pe or i nsul at ed pi pe sur f aces ar e l ess t han 4 i nches apar t . Appl y spr eader s at same i nt er val as sway br aces at an equal di st ance bet ween t he sway br aces. I f r ack t ype hanger s ar e used wher e t he pi pes ar e r est r ai ned f r om cont act by mount i ng t o t he r ack, spr eader s ar e not r equi r ed f or pi pes mount ed i n t he r ack. Appl y spr eader s t o sur f ace of bar e pi pe and over i nsul at i on on i nsul at ed pi pes ut i l i z i ng hi gh- densi t y i nser t s and pi pe pr ot ect i on shi el ds i n accor dance wi t h t he r equi r ement s of Sect i on 23 07 00 THERMAL I NSULATI ON FOR MECHANI CAL SYSTEMS.

3. 6 SWAY BRACES FOR PI PI NG

Pr ovi de sway br aces t o pr event movement of t he pi pes under sei smi c l oadi ng. Pr ovi de br aces i n bot h t he l ongi t udi nal and t r ansver se di r ect i ons, r el at i ve t o t he axi s of t he pi pe. Pr ovi de suf f i c i ent br aces f or equi pment t o r esi st a hor i zont al f or ce as speci f i ed i n UFC 3- 301- 01 wi t hout exceedi ng saf e wor ki ng st r ess of br aci ng component s. Pr ovi de br aci ng t hat does not i nt er f er e wi t h t her mal expansi on r equi r ement s f or t he pi pes as descr i bed i n ot her sect i ons of t hese speci f i cat i ons. For sei smi c anal ysi s of hor i zont al pi pes, t he equi val ent st at i c f or ce shoul d be consi der ed t o act concur r ent l y wi t h t he f ul l dead l oad of t he pi pe, i ncl udi ng cont ent s.

3. 6. 1 Tr ansver se Sway Br aci ng

Pr ovi de t r ansver se sway br aci ng f or st eel and copper pi pe at i nt er val s not t o exceed t hose shown on t he dr awi ngs. Al l r uns ( l engt h of pi pe bet ween end j oi nt s) must have a mi ni mum of t r ansver se br aci ng at each end.

Pr ovi de t r ansver se sway br aci ng f or pi pes of mat er i al s ot her t han st eel and copper at i nt er val s not t o exceed t he hanger spaci ng as speci f i ed i n Sect i on 22 00 00 PLUMBI NG, GENERAL PURPOSE.

3. 6. 2 Longi t udi nal Sway Br aci ng

Pr ovi de l ongi t udi nal sway br aci ng at 40 f oot i nt er val s unl ess ot her wi se i ndi cat ed. Al l r uns ( l engt h of pi pe bet ween end j oi nt s) must have one

SECTI ON 23 05 48. 19 Page 8

Doolittle, Nicholas J.

Arrow

Doolittle, Nicholas J.

Arrow l ongi t udi nal br ace mi ni mum. Const r uct sway br aces i n accor dance wi t h t he dr awi ngs. Do not use br anch l i nes, wal l s, or f l oor s as sway br aces.

3. 6. 3 Ver t i cal Runs

Run i s def i ned as l engt h of pi pe bet ween end j oi nt s. Do not br ace ver t i cal r uns of pi pi ng no mor e t han 10 f oot ver t i cal i nt er val s. Br aces f or ver t i cal r uns must be above t he cent er of gr avi t y of t he segment bei ng br aced. Fl exi bl e coupl i ngs shoul d be pr ovi ded at t he bot t oms of r i ser s f or pi pes l ar ger t han 3. 5 i n. ( 89 mm) i n di amet er . Fl exi bl e coupl i ngs and expansi on j oi nt s shoul d be br aced l at er al l y and l ongi t udi nal l y unl ess such br aci ng woul d i nt er f er e wi t h t he act i on of t he coupl i ngs or j oi nt s. When pi pes ent er bui l di ngs, f l exi bl e coupl i ngs shoul d be pr ovi ded t o al l ow f or r el at i ve movement bet ween t he soi l and bui l di ng. Const r uct al l sway br aces i n accor dance wi t h t he dr awi ngs. At t ach sway br aces t o t he st r uct ur al syst em. Do not connect t o br anch l i nes, wal l s, or f l oor s.

3. 6. 4 Cl amps and Hanger s

Appl y c l amps or hanger s on uni nsul at ed pi pes di r ect l y t o pi pe. I nsul at ed pi pi ng must have cl amps or hanger s appl i ed over i nsul at i on i n accor dance wi t h Sect i on 23 07 00 THERMAL I NSULATI ON FOR MECHANI CAL SYSTEMS.

Hanger r od st i f f ener angl e or st r ut br aci ng must be secur el y at t ached by a ser i es of at t achment c l amps manuf act ur ed f r om a one pi ece met al st ampi ng and must i ncl ude al l r equi r e at t achment har dwar e and l ocki ng nut s.

At t achment c l amps made f r om al umi num or cast i r on must not be used i n sei smi c appl i cat i ons. Do not wel d ver t i cal br aces t o hanger r ods.

3. 7 SWAY BRACES FOR DUCTS

3. 7. 1 Br aced Duct s

Pr ovi de br aci ng det ai l s and spaci ng f or r ect angul ar and r ound duct s i n accor dance wi t h SMACNA 1981. However , t he desi gn sei smi c l oadi ngs f or t hese i t ems must not be l ess t han l oadi ngs obt ai ned usi ng t he pr ocedur es i n UFC 3- 301- 01. Br aci ng must not at t ach t o duct j oi nt s. Use shor t est scr ews possi bl e when penet r at i ng duct wor k t o mi ni mi ze ai r f l ow noi se i nsi de duct .

3. 7. 2 Unbr aced Duct s

At t ach hanger s f or unbr aced duct s t o t he duct wi t hi n 2 i nches of t he t op of t he duct wi t h a mi ni mum of t wo #10 sheet met al scr ews. I nst al l unbr aced duct s wi t h a 6 i nch mi ni mum cl ear ance t o ver t i cal cei l i ng hanger wi r es.

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SECTI ON 23 05 48. 19 Page 9

Doolittle, Nicholas J.

Arrow

Doolittle, Nicholas J.

Arrow