DOW STYROFOAM Installation Guidelines – Piping Systems

[Pages:19]DOW? STYROFOAMTM Installation Guidelines ? Piping Systems

1 .0 General

1.1 Scope: This docum ent pert ains t o inst allat ion guidelines for Dow? STYROFOAMTM, vapor barriers and j acket ing for piping applicat ions, elbows, fit t ings and valves for t he following applicat ions. This docum ent also cont ains inform at ion relat ed t o inst allat ion on t anks and vessels. More det ailed inform at ion is available in t he DOW? STYROFOAMTM I nst allat ion Guidelines ? Tanks and Vessels.

1.1.1 Chilled Piping Service ( 35? F t o70?F) 1.1.2 Cold Piping Service ( - 100? F t o 35? F) 1.1.3 Cryogenic Piping Service ( - 300? F t o - 100? F)

1.2 Applicable ASTM St andards: 1.2.1 C518 St andard t est m et hod for st eady ? st at e t her m al t ransm ission propert ies by m eans of heat flow meter apparatus 1.2.2 D1621 Standard test m et hod for com pressive properties of therm al rigid cellular plastics 1.2.3 D1622 Standard test m et hod for density of therm al rigid cellular plastics 1.2.4 E96 St andard t est m et hod for wat er t ransm ission of cellular plast ics 1.2.5 C272 St andard t est m et hod for wat er absorpt ion of cellular plast ics 1.2.6 D696 St andard t est m et hod for coefficient of linear t herm al expansion of plastics bet ween 1.2.7 - 30? C and + 30? C wit h a vit reous silica dilat om et er 1.2.8 E84 St andard t est m et hod for flam e spread / sm ok e developed using t unnel burn t est . 1.2.9 C450 St andard pract ice for fabricat ion of t herm al insulat ion fit t ing covers for nps and vessel lags 1.2.10 C585 St andard pract ice for inner and out er diam et ers of t herm al insulat ion for nom inal pipe and tubing

1.3 Relat ed Docum ent s: 1.3.1 Specificat ion 15088 ? Pipe Paint ing 1.3.2 Polyguard / Dow XPS Dat a Sheet 1.3.3 Dow XPS MSDS

1.4 Definitions: 1.4.1 Rigid STYROFOAMTM PI B I nsulat ion m eet s ASTM C578 St andard Specificat ion for Rigid Cellular Polyst yrene Therm al I nsulat ion and t he st andards and t est s list ed above. 1.4.2 Chilled Service Piping: Refers t o below am bient piping in t he 35? F t o 70? F range 1.4.3 Cold Service Piping: Refers t o below am bient piping in t he - 100? F t o 35? F range 1.4.4 Cryogenic Piping: Refers t o ext rem ely cold piping in t he - 300? F t o - 100? F range 1.4.5 Nom inal I nsulat ion Thickness: Refers t o t he norm al t hickness t hat insulat ion fabricat ors will provide based on standard tables, pipe sizes and wall thicknesses 1.4.6 OD: Refers t o t he out er diam et er of t he insulat ion and/ or finish covering 1.4.7 R- Value: 1 h?ft ? ?? F/ BTU I s t he unit used for t herm al resist ance 1.4.8 K- Fact or: BTU/ ft ? / ? F/ hr is t he reciprocal or R- Value at a 1 inch t hickness. 1.4.9 SSL: Acronym for self- sealing lap. Oft en found on vapor barrier film s and m em branes.

1.5 Qualit y Assurance: 1.5.1 Dow? STYROFOAMTM PI B shall not be produced wit h, or cont ain, any of t he Unit ed St at es EPA regulat ed CFC Com pounds list ed in t he Mont real Prot ocol of t he Unit ed Nat ions Environm ent al Program . 1.5.2 I nstallation guidelines and thickness recom m endations m ust be followed by the skilled installer in a m anner of good workm anship.

1.6 Delivery, Handling & Storage: 1.6.1 Prot ect insulat ion from physical dam age and excessive m oist ure. 1.6.2 St ore indoors and keep free from exposure t o UV, rain, hail, snow and wind.

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1.6.3 Handle insulation sections carefully so corners are not broken off creating voids. I nspect for lags or gaps in longitudinal and butt j oints. Vapor barrier m ust be intact and free of holes or v oid s.

2 .0 Products 2.1 I nsulation: 2.1.1 I nsulat ion Type is Ext ruded ( XPS) ? Polyst yrene Billet : ASTM C578 wit h flam e spread and sm oke developed indexes of 5 / 165, respect ively, up t o 4" insulat ion t hickness per ASTM E84. a. Rigid Close Cell Foam I nsulat ion b. Com ply wit h ASTM C578, Type XI I I , densit y 1.6 lb/ cu ft , m inim um com pressive st rengt h 20 psi at 10 percent deform at ion ( ASTM D1621) c. Therm al resist ance: K- Fact or of .259 @ 75? F Mean d. Wat er absorpt ion: Maxim um 0.5 % by volum e per ASTM C272 e. Surface Burning Charact erist ics: ( ASTM E84) up t o 4" i) Flam e Spread: 5 ii) Sm oke Developed: 165

2.1.2 2.1.3

2.1.4

Pipe sect ions, fit t ings, valves and vessels t o be fabricat ed from bun st ock by an aut horized fabricat or and m ust adhere t o t he appropriat e st andard list ed in sect ions 1.1 and 1.2. At 90 and 45 degree elbows, valves and fit t ings, pre- m olded 2 piece syst em shall be inst alled t hat fit s snug on t he pipe or com ponent . Mit ered elbows and fiberglass filled PVC elbows in particular are not recom m ended for chilled service piping and colder. Vessels, heads, segm ent s & bodies shall be fabricated t o fit t he curves and cont ours of t he vessel being insulated. 2.1.4.1 Vessel head segm ents to be curved and cut to m inim ize or elim inate voids at the head

sect ion. Two part spray applied polyuret hane foam shall be used t o fill in voids. 2.1.4.2 Vessel segm ent s shall be fabricat ed per ASTM C450

2.2 Joint Sealant , Adhesive & Mast ic, Vapor Ret arder Tape 2.2.1 Joint Sealant for all j oint s of insulat ion shall be vapor barrier t ype, non- hardening, flexible w it h service t em p range of - 50? F t o 200? F. 2.2.1.1 Childers, CP- 70 2.2.1.2 Boss 368 2.2.2 Adhesive used to apply vapor retarder to insulation shall be one of the following: 2.2.2.1 Childers, 85- 50 2.2.2.2 Childers, 85- 60 2.2.3 Mast ic 2.2.3.1 Childers, CP- 35 2.2.4 Vapor Guard Tape: 2.2.4.1 Polyguard 1677 Tape

2.3 Vapor Barrier: 2.3.1 Vapor Barrier should have a m axim um perm eance of 0.015 after final application. Where vapor barrier tape is required to seal butt and longitudinal j oints or for wrapping of fittings, use a com pat ible tape from the sam e m anufacturer as the vapor barrier. 2.3.2 For Cold & Cryogenic service on out door piping, rubberized asphalt based vapor barriers are recom m ended since they are m ore puncture resistant and are self- healing. Also, for extrem e Cryogenic piping, where t riple layers of insulat ion are required, a rubberized asphalt vapor barrier is recom m ended for t he prim ary and a film type vapor barrier is recom m ended as a secondary vapor barrier. 2.3.3 Vapor Barriers are applied to the outside surface of the insulation on pipe covering, valves, fit t ings and vessels. They are int ended t o m inim ize wat er and m oist ure m igrat ion from t he ext ernal environm ent and keep it away from t he insulat ion and piping. Moist ure causes a reduction in therm al perform ance of the insulation and can cause pipe corrosion if trapped bet ween t he pipe and insulat ion. Refer t o t he following product s and links for inst allat ion inform ation. Additional inform ation in appendix section.

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2.3.4

Acceptable Vapor Barriers 2.3.4.1 Polyguard Zero Perm and Zero Perm A 2.3.4.2 Dow Saran 2.3.4.3 Polyguard I nsulrap 30

2.4 Prot ect ive Jacket ing: 2.4.1 Cladding: Cladding should have a m axim um perm eance of 0.000 or bet t er aft er final applicat ion .

2.4.2

Rubberized asphalt based cladding product s are recom m ended for ext erior use. These product s have t he perm rat ing of a vapor barrier, yet are UV st able in ext erior environm ent s. Product s are available in silver or whit e, sm oot h or em bossed. All product s m ust have a 10 year warranty.

2.4.3

Accept able Cladding Product s: Ext erior 2.4.3.1 Polyguard Alum aguard 2.4.3.2 Polyguard Alum aguard All Weat her 2.4.3.3 Polyguard Alum aguard Cool Duct

2.4.4 Accept able Cladding Product s: I nt erior 2.4.4.1 Alum aguard Lit e ( Whit e or Silver)

2.4.5

PVC Jacket ing for I ndoor Applicat ions: 2.4.5.1 PVC j acket is not a vapor barrier; it provides som e m echanical prot ect ion t o t he

insulation and vapor barrier, aesthetics and color coding. 2.4.5.2 30 m il t hick PVC is recom m ended on pipe sect ions and fit t ings in st andard

applicat ions. A 40 m il t hickness is recom m ended in spray or wash down areas. 2.4.5.3 Joint s shall be solvent welded wit h m anufact urer recom m ended product . 2.4.5.4 PVC j acket ing for fit t ings, t ees, elbows, valves et c. should be heavy dut y fit t ing

cov er s. 2.4.5.5 Pipe sect ions t o be covered wit h PVC sect ional pieces. 2.4.5.6 Refer t o t he PVC Manufact urer for t em perat ure lim it at ions.

2.4.6

Accept able PVC Manufact urers: 2.4.6.1 PI C Plast ics 2.4.6.2 Prot o 2.4.6.3 Ceel Co

2.4.7

Met al Jacket ing for Out door Applicat ions: 2.4.7.1 Met al j acket ing is not a vapor barrier, it is designed t o prot ect t he insulat ion and vapor

barrier from physical abuse from weat her, m echanical wear or ot her dam age. The j acket ing shall be Alum inum Alloy 1100 m eet ing ASTM B209, and m ust have a polysurlyn m oisture barrier on the back side. 2.4.7.2 Mat erial recom m endat ions: 2.4.7.2.1 0.016 inch thick for pipe sections 2.4.7.2.2 0.020, 0.024 or 0.032 should be considered in high abuse areas 2.4.7.2.3 Stucco finish is recom m ended 2.4.7.2.4 Banding should be st ainless st eel T304/ T316 ? " x 0.020" wit h st ainless

steel wing seal. 2.4.7.3 Recom m ended Manufact ur ers:

2.4.7.3.1 RPR Product s 2.4.7.3.2 St andard Met al 2.4.7.3.3 I deal Met al 2.4.7.3.4 I TW I nsulat ion

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2.6 Pipe & Hanger Support Saddles: 2.6.1 Pipe support , load bearing insulat ion shall be fabricat ed in 180 degree sect ions from Dow? STYROFOAMTM for up t o 10" pipe diam et er. Saddle lengt h m ust be adj ust ed t o m inim ize loading and prevent excessive com pression of the insulation. 2.6.2 Load bearing shields shall be provided by t he cont ract or. 2.6.3 Sliding saddles are recom m ended for use on any t ype of j acket syst em . They absorb all of t he abuse from expansion and cont ract ion of t he piping syst em . The j acket will rem ain in serviceable condit ion m uch longer using a sliding saddle. Sliding saddles have enough give for expansion and cont ract ion t hat t hey don't end up on t he floor or falling from t he roof. They are less expensive than roller hangers. 2.6.4 Recom m ended Saddles: 2.6.4.1 Polyguard Alum aGlide.

2.7 Pipe Prot ect ion: 2.7.1 All piping on cold system s should have a coating to protect against corrosion. With a good vapor barrier and t ight ly closed cell XPS insulat ion, t he chances of m oist ure int rusion are reduced significant ly. Even wit h t his reduced risk, pipe prot ect ion is st ill recom m ended. These syst em s will be in service for a long t im e, and t here will be num erous opport unit ies for physical dam age to the system . I f m oisture gets trapped between the pipe and insulation, corrosion will occur. 2.7.2 React ive Gel is recom m ended for pipe corrosion prot ect ion. 2.7.2.1 React ive Gel provides a m oist ure and oxygen barrier t hat expands, cont ract s and m oves with the entire piping system . 2.7.2.2 React ive Gel " convert s" t he surface of ferrous m et als t o enhance corrosion resist ance and buffers the pH of any m oisture that penetrates into the system to m inim ize cor r osion . 2.7.2.3 Apply in 25 m il thickness as recom m ended by the m anufacturer 2.7.3 Recom m ended Product s 2.7.3.1 Polyguard RG- 2400LT ( Piping and vessels - 100? F t o 250? F) 2.7.3.2 Polyguard RG- CHW ( Piping 33? F t o 160? F) 2.7.3.3 Polyguard RG- 2400ET ( Hot lines up t o 350? F)

2.8 Miscellaneous Mat erials: 2.8.1 Fiber reinforced ( st rapping) filam ent t ape shall be a m inim um ? inches wide and shall be used to secure insulation pipe and fitting sections to the piping system . A m inim um of 3 pieces shall be wrapped circum ferent ially around t he insulat ion for each sect ion of insulat ion. Tape shall be overlapped 50 percent ont o itself. 2.8.2 Spray uret hane foam , single com ponent available in aerosol cans shall be used t o fill m inor gaps between sections of insulation. 2.8.3 Flexible closed cell elast om eric insulat ion supplied as sheet or pr eform ed pipe covering m ay be used t o form expansion / cont ract ion j oint s. Not e: Use of a non- halogenat ed elast om eric insulat ion is recom m ended when react ive gel is not used t o prot ect t he piping syst em from cor r osion .

3 .0 Execut ion 3.1 Preparat ion 3.1.1 I nsulation should not be stored or installed around welding, abrasion, or anything that would likely cause dam age to the m aterial. I nstall insulation after these j obs are com plete. 3.1.2 Surface Preparat ion 3.1.2.1 Before insulation or reactive gel ( if applicable) is installed, all pipe surfaces should be free of m oisture, dirt, oil, grease, loose scale, rust or other abnorm al m aterial. 3.1.2.2 I f loose scale or surface corrosion are present , clean using a wire brush ( SP- 2) .

3.2 Pipe Prot ect ion ( I f required by end user) 3.2.1 After preparation steps above are com plete, install reactive gel on the pipe. 3.2.2 Brush or glove apply reactive gel to the piping to approxim ately 30m il wet film thickness (wft) . 3.2.3 Use an AccuTrowel t o screed t he gel t o a 25m il finish t hickness.

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3.2.4

Apply insulation im m ediately after reactive gel application is com plete. I nsulation can be applied w it hin m inut es of gel applicat ion. For best result s apply insulat ion right behind gel applicat ion .

3.3 I nsulation I nstallation ( including vapor barrier) 3.3.1 I nspect insulation to m ake sure it is tightly butted and free of gaps and voids. 3.3.2 I nspect vapor barrier and other j acketing to m ake sure it is intact and free of dam age. 3.3.3 Apply insulation to the piping with longitudinal j oints at 3 and 9 o'clock positions and butt j oint s st aggered. For chilled service, adhesive m ay be used inst ead of j oint sealant , and st aggered but t j oint s m ay not be required. Refer t o t he end user 's specificat ion for specific requirem ent s. For cold and cryogenic service applicat ions, j oint sealant is required on t he longit udinal and but t j oint s. Also for t hese colder applications offset t he but t j oint s as well so t hat t hey do not line up. These upper and lower but t j oint s should be st aggered bet w een 6- 18 inches. Expansion and cont ract ion m at erial is recom m ended ever y 50 ft . I nst all by leaving a 1" gap between insulation sections and com pressing a 2" length of flexible insulation into the gap. Elast om eric Rubber t ype insulat ion is oft en used, and non- halogenat ed m at erial is available from several m anufacturers. 3.3.4 Use j oint sealant list ed above in sect ion 2.2 for longit udinal and but t j oint s 3.3.5 Secure each layer of insulation with tape or bands and tighten bands without deform ing insulat ion m at erials. Orient longit udinal j oint s bet ween half sect ions in 3 and 9 o'clock positions on the pipe. 3.3.6 For m axim um perform ance, a fully adhered vapor barrier film or m em brane should be applied on site for cold and cryogenic service work. 3.3.7 I nsulation for chilled service piping can have factory applied vapor barrier or the vapor barrier can be installed on site. 3.3.7.1 For I nsulat ion wit h fact ory applied j acket s wit h vapor barriers, do not st aple longitudinal tabs. I nstead secure tabs using additional adhesive or tape to strengthen SSL bond if needed. 3.3.8 All insulation shall be tightly butted and free of voids and gaps at all j oints. 3.3.9 Vapor St op Applicat ion 3.3.9.1 Apply vapor stops every 20- 30 feet of straight runs, before and after every exposed valve or fitting and at term inations both around the pipe and over the butt joint of the insulation. Vapor stops m ust be continuous and tie in to the vapor barrier to m inim ize m oist ure penet rat ion. Please see diagram 3 for furt her det ail. 3.3.9.2 Apply eit her Vapor Guard t ape or m ast ic ? fab ? m ast ic applicat ion. 3.3.10 Field Applied Vapor Barriers: 3.3.10.1.1 Field applied vapor barriers should be applied wit hout st aples or nails. Apply vapor barrier so that longitudinal j oint is facing down ward ( to shed water) at 4 o'clock position. 3.3.10.1.2 Apply film type vapor barrier with one of the recom m ended adhesives listed in sect ion 2.2 or wit h com pat ible vapor barrier t ape. Longit udinal overlap should be 2" for adequat e adhesion. Apply SSL t o firm ly close longit udinal j oint s. Rubberized asphalt vapor barriers have a peel and st ick overlap t hat is sufficient t o seal m em brane in inst allat ion t em perat ures above 50? F. For below 50? F installation tem peratures, an activator is necessary. 3.3.10.1.3 Apply tape strips at butt j oints to secure insulation sections and further hold vapor barrier in place. 3.3.10.1.4 Vapor barrier m ust be continuous on pipe sections and should be installed in a cigarette fashion. 3.3.11 I nsulat ion I nst allat ion on Pipe Flanges: 3.3.11.1 I nstall preform ed pipe insulation to outer diam eter of pipe flange. 3.3.11.2 Make widt h of insulat ion sect ion sam e as overall widt h of flange and bolt s, and m ake thickness sam e as adj acent pipe insulation, not to exceed 1.5" . 3.3.11.3 Fill voids bet ween inner circum ference of flange insulat ion and out er circum ference of adj acent straight pipe segm ents with cut sections of styrene block insulation of sam e t hickness as pipe insulation. 3.3.12 I nsulat ion I nst allat ion on Pipe Fit t ings and Elbows: I nstall preform ed insulation sections of sam e m aterial as straight segm ents of pipe insulation. Joint s should be consist ent wit h pipe sect ions if sealant is required.

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Spiral wrap vapor ret arder t ape wit h ? " overlap t o secure elbow or fit ting tight ness and seal up joint. 3.3.13 I nsulat ion I nst allat ion on Valve and Pipe Specialt ies I nstall preform ed section of polystyrene insulation to valve body. Arrange insulation to perm it access to packing and allow valve operation without disturbing in su lat ion . I nst all insulation t o flanges as specified for flange insulation applicat ion.

3.4 Preparat ion For Double Layered Syst em s, Cold or Cryogenic syst em s wit h m ore t han 2.5" of insulat ion. 3.4.1 I nsulation should not be installed around welding, abrasion, or anything that would likely cause dam age to the m aterial. I nstall insulation after these j obs are com plete. 3.4.2 Surface Preparat ion 3.4.2.1 Before insulat ion or anti corrosion gel ( if applicable) is inst alled, all pipe surfaces should be free of dirt, oil, loose scale rust or other abnorm al m aterial.

3.5 Pipe Prot ect ion ( I f required by end- user) 3.5.1 After preparations steps above are com plete, install pipe protective gel. 3.5.2 Check piping again for loose scale corrosion. I f present wire brush ( SP- 2) exist ing corrosion 3.5.3 Brush or glove apply gel product to the piping at approxim ately 30m il wft. 3.5.4 Use t he AccuTrowel t o screed t he react ive gel applicat ion t o a 25m il finish t hickness. 3.5.5 Apply insulation im m ediately after reactive gel application is com plete. I nsulation can be inst alled wit hin m inut es of react ive gel applicat ion. For best result s apply insulat ion right behind react ive gel applicat ion.

3.6 I nsulation I nstallation ( including j acket and vapor barrier) 3.6.1 I nspect insulation to m ake sure it is tightly butted and free of gaps and voids. 3.6.2 I nspect vapor barrier and outer j acketing to m ake sure it is intact and free of dam age. 3.6.3 Apply inner layer of insulation to the piping with longitudinal j oints at 12 and 6 o'clock posit ions. Do not apply j oint sealant t o inner layer unless required by t he end user. For cold and cryogenic service applicat ions, j oint sealant is required on t he longit udinal and but t j oint s. St agger t he but t j oint s so t hat t hey do not line up. These upper and lower but t j oint s should be staggered between 6- 18 inches. 3.6.4 Secure each layer of insulation with strapping tape or bands and tighten bands without deform ing insulat ion m aterials. 3.6.5 Stagger the second insulation layer so that butts and longitudinal j oints do not line up with the first layer. Orient second or out er layer of insulat ion bet ween half sect ions in 3 and 9 o'clock posit ions on t he pipe. Expansion and cont ract ion j oint m at erial is recom m ended every 50 ft , filling a 1" gap wit h 2" of a flexible insulat ion m at erial such as elast om eric insulat ion. 3.6.6 Apply j oint sealant t o second ( out er) layer only unless ot herwise specified. Use j oint sealant listed above in section 2.2 3.6.7 Vapor barrier film or m em brane should be applied on site for cold and cryogenic service work. 3.6.8 All insulation shall be tightly butted and free of voids and gaps at all j oints. 3.6.9 Vapor St op Applicat ion: 3.6.9.1 Apply vapor stops every 20- 30 feet on straight runs, before and after every exposed valve or fitting and at term inations both around the pipe and over the butt joint of the insulat ion. Please see diagram 3 for furt her det ails. 3.6.9.2 Apply eit her Vapor Guard t ape or m ast ic ? fab ? m ast ic applicat ion 3.6.10 Field Applied Vapor Barriers: 3.6.10.1 Field applied vapor barriers should be applied wit hout st aples or nails. Apply vapor barrier so that longitudinal j oint is facing downward ( to shed water) at the 4 o'clock posit ion . 3.6.10.2 Apply film t ype vapor barrier wit h one of recom m ended adhesives list ed in sect ion 2.2 or a com pat ible vapor barrier t ape. Longit udinal overlap should be 2" for adequat e adhesion. 3.6.10.3 Apply SSL t o firm ly close longit udinal j oint s. Rubberized asphalt vapor barriers have a peel and st ick overlap t hat is sufficient t o seal m em brane in inst allat ion t em perat ur es above 50? F. For below 50? F inst allat ion t em perat ures, an act ivat or is n ecessar y .

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3.6.10.4 Apply tape strips at butt j oints to secure insulation sections and further hold vapor barrier in place. Vapor barrier m ust be continuous on pipe sections and should be installed in a cigarette fashion.

3.6.11 I nsulat ion I nst allat ion on Pipe Flanges: 3.6.11.1 I nstall preform ed pipe insulation to outer diam eter of pipe flange. 3.6.11.2 Make widt h of insulation sect ion sam e as overall widt h of flange and bolt s, and m ake thickness sam e as adj acent pipe insulation, not to exceed 1.5" 3.6.11.3 Fill voids bet ween inner circum ference of flange insulat ion and out er circum ference of adj acent straight pipe segm ents with cut sections of styrene block insulation of sam e t hickness as pipe insulation.

3.6.12 I nsulat ion I nst allat ion on Pipe Fit t ings and Elbows: 3.6.12.1 I nstall preform ed insulation sections of sam e m aterial as straight segm ents of pipe in su lat ion . 3.6.12.2 Joint s should be consist ent wit h pipe sect ions if sealant is required. 3.6.12.3 Spiral wrap vapor ret arder t ape wit h ? " overlap t o secure elbow or fit ting tight ness and seal up j oint.

3.6.13 I nsulat ion I nst allat ion on Valve and Pipe Specialt ies: 3.6.13.1 I nstall preform ed section of polystyrene insulation to valve body. 3.6.13.2 Arrange insulation to perm it access to packing and allow valve operation without disturbing insulation. 3.6.13.3 I nst all insulation t o flanges as specified for flange insulation applicat ion.

3.7 Tank & Vessel I nsulat ion I nst allat ion: 3.7.1 Vessel Walls: 3.7.1.1 Walls of vessels shall be insulated with double layered insulation, unless insulation thickness is less than 3" . 3.7.1.2 Double layered insulation system s should be staggered by 50% overlap so that no j oints allow for full m oisture penetration all the way through to the vessel. 3.7.1.3 Curved wall segm ent s shall be beveled t o fit around t he t ank or vessel sm oot hly, segm ents should be the sam e size. 3.7.1.4 Vessels with diam eters larger than 4 ft. should have additional insulation to support tops and sidewalls. 3.7.1.5 Joint sealant from sect ion 2.2 should be used t o seal all j oint s. 3.7.1.6 ? banding is required on 12" centers. 3.7.1.7 Vapor barrier shall cover entire insulation section on walls before protective j acket is in st alled. 3.7.2 Vessel Heads: 3.7.2.1 Vessel heads should have j oint s consistent wit h t he longit udinal sect ions and walls. 3.7.2.2 For syst em s requiring m ore t han 4" t hickness, vessel heads shall be double layered and j oints should be staggered. 3.7.2.3 Joint sealant from sect ion 2.2 shall be used on all j oint s. 3.7.2.4 Vapor barrier to cover tank head is im portant on cold or cryogenic system s and shall tie into the vapor barrier on the vessel body to create a continuous vapor barrier. 3.7.2.5 Dish type vessel head is preferred. I f flat vessel heads are used, j oints with the vessel body insulation shall be staggered, and all cavities shall be filled with spray urethane in su lat ion . 3.7.2.6 Cont oured vessel heads m ay be direct ly adhered t o t he vessel if react ive gel is not required. I f reactive gel is used, tem porary m echanical attachm ent m ay be required. Fully adhered vapor barrier is recom m ended on all vessels.

3.8 I ndoor Jacket ing I nst allat ion: 3.8.1 PVC j acket t o be inst alled direct ly over t he insulat ion and vapor barrier. 3.8.1.1 Longit udinal PVC slip t o overlap 2- 3 inches past t he insulat ion longit udinal j oint . 3.8.1.2 PVC but t lap slip overlap should be 2- 3 inches in t o t he following sect ion, t elescope for m at . 3.8.1.3 PVC over lap and bond t o be at approxim at ely 4 o'clock. 3.8.1.4 PVC lap t o be solvent welded wit h sealant recom m ended by m anufact urer.

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3.8.2

3.8.1.5 Valves, fittings, tees, elbows and other specialty item s to be pre m olded or fabricated by a skilled contractor or fabricator.

3.8.1.6 See m anufact urer's guidelines on PVC inst allat ion. I f I ndoor cladding is desired Alum aguard Lit e Whit e is a good choice in low t raffic areas not subj ect to wash downs. 3.8.2.1 Alum aguard Lit e can be applied in place of a vapor barrier and PVC j acket . 3.8.2.2 Spiral wrap elbows and fittings in sim ilar fashion as listed in above vapor barrier

guideline. 3.8.2.3 Overlap longit udinal j oint s by 6 inches and but t j oint s by 3 inches, secure wit h peel

and stick overlap. 3.8.2.4 Connect out er layer insulat ion sect ions wit h Alum aguard Lit e t ape at t he but t j oint s. 3.8.2.5 I n som e cases for m ild tem peratures in the chilled service category, this j acket can

com e factory applied.

3.9 Out door Jack et ing I nst allat ion 3.9.1 Met al j acket t o be inst alled direct ly over t he insulat ion and vapor barrier. 3.9.1.1 Longit udinal m et al slip t o overlap 2- 3 inches past t he insulat ion longit udinal j oint . 3.9.1.2 Met al overlap t o be at approxim at ely 4 o'clock on horizont al piping. 3.9.1.3 Met al lap t o be sealed wit h sealant recom m ended by m anufact urer t o lim it m oist ure int rusion under t he j acket . 3.9.1.4 Valves, fittings, tees, elbows and other specialty item s to be preform ed up to 12" . Where preform ed is not available, m et al gores fabricat ion by a skilled cont ract or or fabricator shall be used. 3.9.1.5 St ainless st eel st rapping bands shall be used t o secure m et al j acket on pipe sect ionals circum ferences on 12" centers. No screws or sharp obj ects that could puncture the vapor barrier are perm itted. 3.9.1.6 See m anufacturer's guidelines on m etal installation and banding pattern.

3.9.2

I f outdoor cladding is desired Alum aguard or Alum aguard All Weather is a good choice. 3.9.2.1 Alum aguard can be applied in place of a vapor barrier and m etal j acket. 3.9.2.2 Spiral wrap elbows and fittings in sim ilar fashion as listed in above vapor barrier

guideline. 3.9.2.3 Overlap longit udinal j oint s by 6 inches and but t j oint s by 3 inches, secure wit h peel

and stick overlap. 3.9.2.4 I n som e cases for m ild tem peratures in the chilled service category, this j acket can

com e factory applied. 3.9.2.5 Stainless steel banding m ust be used every 18" on center of the insulation section.

Banding shall not crim p or cut the cladding.

3.10 Underground Burial 3.10.1 Polyguard I - 50 Vapor Barrier t o be inst alled direct ly over t he insulat ion. 3.10.2 Longit udinal overlap t o be 2- 3 inches past t he insulat ion longit udinal j oint 3.10.3 Overlap longit udinal j oint at approxim at ely 4 o'clock 3.10.4 Overlap but t j oint 3 inches 3.10.5 Secure longitudinal and butt j oints with peel and stick overlap 3.10.6 Spiral wrap fittings with I - 50 tape to cover valve or fitting com pletely

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