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ISO-HT Installation Guidelines
Rev 1009
SCOPE: This Installation Guide Provides Recommended Materials and Installation Practices for ISO-HT Insulation Manufactured by Dyplast Products in the following applications:
- piping
- vessels and other equipment
For Specifications in accordance with 3-part Construction Specification Institute (CSI) format, view www.dyplastproducts.com/index_specs.htm.
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Physical Characteristics of ISO-HT Rigid Foam Polyisocyanurate Insulation:
- A complete list of physical properties can be found by viewing www.dyplastproducts.com/index_physical_prop.htm.
- ISO-HT products can insulate systems up to 400F
- ISO products are free of CFC and HCFC blowing agents
- Excellent moisture vapor resistance, >90% closed cell (2 perm inches/ASTM C209).
- ISO-HT is manufactured as bunstock and can fabricated to virtually any size and configuration
- ISO-HT meets or exceeds the requirements according to ASTM C591.
- ISO-HT initial thermal resistance is R=6.67 at 1 inch thick per ASTM C518 (k=0.15); with the product conditioned for 6 months at 70-75F and 45-55% RH prior to testing the R=5.7 (k=0.176).
- ISO-HT has high compressive strength, is light weight and easy to install.
Limitations and Disclaimer of Warranties and Liabilities
Important: The statements expressed on these pages are the general recommendations for the application of the products as outlined, and written for the interpretation and application by an experienced contractor. Any deviation from these recommended procedures shall be at the sole risk of the installers. Failure to follow these instructions may result in serious damage to the application and life of this roofing product, resulting in the termination of any warranty, expressed or implied. Characteristics, properties, performance of materials, and application specifications herein described are based on data obtained under controlled conditions.
Information is supplied upon the condition that the persons receiving same will make their own determination as to its suitability for their purposes and the reasonableness of the recommendations under the actual installation circumstances. Dyplast Products makes no implied warranties of any type, including without limitation, any warrant of merchantability or fitness of purpose. In no event will Dyplast Products be responsible for damages of any nature whatsoever resulting from the use of or reliance upon this information or the product to which information refers. No agent, sales representative, or employee is empowered to change, alter, or amend this provision, unless approved in writing by a duly authorized officer of Dyplast Products.
1.0 SCOPE
1.1 Applicability
1.2 Dyplast References
1.3 No Warranty
2.0 GENERAL
2.1 Clean Piping
2.2 Shipping/Storage
2.3 Testing
2.4 Thickness
3.0 MATERIALS OF CONSTRUCTION
3.1 Insulation Materials for Piping, Fittings, and Valves
3.2 Fabrication of Insulation
3.3 Adhesives, Joint Sealers and Mastics
3.4 Vapor Retarder
3.5 Contraction/Expansion Joints
3.6 Protective Jacketing Material
4.0 APPLICATION
4.1 Piping – General
4.2 Outdoor Piping
4.3 Tank, Vessel, and Equipment Insulation
5.0 APPENDICES
5.1 APPENDIX A: CORROSION RESISTANT METAL COATINGS..
5.2 APPENDIX B: DETAILS
5.3 APPENDIX C: THICKNESS TABLE
SCOPE
Applicability
This guideline covers the installation of ISO-HT Polyisocyanurate Insulation on low pressure steam and other high-temperature piping systems plus tanks, vessels and equipment. Due to the variations in service conditions and use, this guideline may not be pertinent for every application. A design or specifying engineer can create specifications tailored to particular applications or owner’s needs. Such a design or specification engineering service may be more familiar with local conditions, budgets, environment, and desired service life of the system allowing them to generate a precise specification. While supplemental insulation products may be referenced in this guideline, Dyplast recommends consulting the manufacturers of these products for proper fitness-for-duty, installation and handling.
Dyplast References
Product data sheets and other Dyplast literature are referenced throughout this guideline. Visit www.DyplastProducts.com for the latest version of these documents. This guideline is subject to revision without notice. Visit www.DyplastProducts.com for the latest version of this document.
No Warranty
This guideline is offered as a guide for the purpose described herein. No warranty of procedures, either expressed or implied is intended. All other express or implied warranties of merchantability or fitness for a particular purpose are disclaimed.
GENERAL
Clean Piping
All piping shall be free of foreign substances and free of surface moisture or frost prior to the application of insulation.
Shipping/Storage
All insulation material shall be delivered to the project site in original, unbroken factory packaging labeled with product designation and thickness. The shipping package should not be air-tight. Shipment of materials from the manufacturer to the installation location shall be in weather-tight transportation. Insulation materials delivered to the job-site shall be stored so as to protect the materials from moisture and weather during storage and installation. Insulation material shall be protected from sunlight to avoid exposure to UV light from the sun.
Testing
All testing of piping systems shall be completed prior to the installation of the insulation system.
Thickness
Refer to insulation thickness charts in Appendix C for recommended insulation thickness based on specific design criteria. For additional insulation thickness calculations utilize the 3E Plus program available at http://www.pipeinsulation.org.
Where insulation thickness required is greater than 2 1/2”, employ a double layer system. Stagger all longitudinal joints between the inner and outer layers. Install the inner and outer layer longitudinal joints 90° to each other with the inner layer joints in the 12 and 6 o’clock positions and the outer layer joints in the 3 and 9 o’clock positions. All butt joints between the inner and outer layers shall be staggered between 6 and 18 inches. Refer to Figure 3 in Appendix B.
MATERIALS OF CONSTRUCTION
Insulation Materials for Piping, Fittings, and Valves
Insulation shall be ISO-HT Polyisocyanurate Insulation manufactured by Dyplast Products, except ISO-C1 shall be used where higher densities are required for saddles in valve hangars.
Insulation shall have a maximum aged thermal conductivity of 0.176 BTU-in/hr-ft2-°F (0.025 W/m-°C) at 75°F mean.
Applications of 2.5 lb/ft3 density polyiso requiring Class 1 (ISO-C1/2.0) ratings per ASTM E84 and shall have been tested in compliance with ASTM C 591and audited by an independent laboratory.
Fabrication of Insulation
Insulation shall be fabricated in required shapes from bun stock in accordance with ASTM C-450 “Standard Practice for Prefabrication and Field Fabrication of Thermal Insulating Fitting Covers for NPS Piping, Vessel Lagging, and Dished Head Segments” and C-585 “Standard Practice for Inner and Outer Diameters of Rigid Thermal Insulation for Nominal Sizes of Pipe and Tubing (NPS System)”. Insulation shall be factory fabricated by a qualified fabricator from bun stock.
Dyplast recommends fittings, such as valves, valve stations, flanges, 90° and 45° elbows, and tees shall be two piece flycut or routed as the preferred fabrication method. For diameters too large for flycutting or routing, the pieces shall be fabricated in two halves with each half made up of mitered sections. Both methods shall be in accordance with ASTM C-450 and ASTM C-585. Refer to applications sections 4.1.6 and 4.1.7 for related additional information.
Store the bun stock at normal shop (indoor) conditions for at least 24 hours before fabrication. This will allow the ISO-HT bun stock to equilibrate to the shop conditions. For best fabrication quality, it is recommended that ISO-HT buns be fabricated into pipe shells in the 36 inch bun length direction to maximize flatness. Fabricated pipe shells with factory-applied vapor retarder shall be aged for 24 hours before vapor retarder attachment. Similarly after fabrication of the fittings/elbows/tees, allow the cut pieces to age for 24 hours before factory application of the vapor retarder to the fabricated pieces. After application of vapor retarder, fabricated pipe shells shall not be stored for more than one month either in the warehouse or at a job site.
Adhesives, Joint Sealers and Mastics
Solvent based adhesives, joint sealers and mastics may be used in contact with ISO-HT insulation. Mastics shall remain flexible at the highest expected ambient temperature.
Joint sealers for sealing joints of insulation shall be vapor retarder type, moisture and water resistant, non hardening, and flexible with a service temperature to 400°F.
A vapor retarder type joint sealer or mastic shall be applied on insulation longitudinal joints and butt joints to prevent moisture and moisture vapor infiltration. Typical joint sealers from Childers include:
-
Chil-Perm CP-30
- Chil-Perm CP-35
- AK-CRYL CP 9
- V1-CRYL-CP-10
Please consult joint sealer manufacturer for recommended products.
Solvent or water adhesives may be used to attach the vapor barrier to the outer surface of the ISO-HT. Refer to the vapor barrier installation guidelines. Consult adhesive manufacturer's literature for instructions on handling adhesives including required operating temperatures.
Potential adhesives for use in this application include:
- Childers CP 88 adhesive (solvent based)
- Foster 81-05 adhesive (solvent based)
- Foster 85-50 adhesive (water based)
- Foster 85-60 adhesive (water based)
Vapor Retarder
In constant operating conditions of 300 to 400 degrees F moisture should not be present and a vapor retarder need not be used, however, in temperature cycling systems and where water intrusion is possible from steam wash down or the environment a vapor retarder is recommended.
Permeance of vapor retarders will vary greatly. Low Permeance Vapor retarders should be in compliance with ASTM C 1136. Numerous variations are available;
- Synthetic Rubber Laminates
- Foil Scrim Craft
- Multi-Ply Laminates of foil and polymer backing with and without pressure sensitive adhesive
Underground Vapor Retarder shall be puncture and water resistant materials such as Polyguard Insulwrap or Venture X with nominal 24 mil thick self adhesive bitumen membrane. Underground vapor retarders shall be continuous around the pipe and have chemical resistance to expected ground water contaminants.
Insulation shall be secured with fiber reinforced tape prior to installation of the vapor retarder material when vapor retarder is field applied
On factory applied Vapor Retarder Film, lap joint to be sealed with SSL tape. All vapor retarder surfaces should be cleaned and free of dust/ grease/ oil/etc before application of the SSL tape to ensure good adhesion between the tape and vapor retarder. Refer Figure 13 in Appendix B. to Apply the Vapor Retarder Tape around the butt joint with a 25% circumference overlap (refer to Figure 14 in appendix B). For other types of factory applied vapor retarders, consult manufacturer’s recommendations on installation
Elbows and fittings shall be wrapped with Vapor Retarder Tape or covered with a mastic type vapor retarder product. Tape is to be wrapped in a spiral configuration. Where permeance less than 0.02 perms is required, tape shall be spiral wrapped with a minimum 50% overlap. If using mastic type vapor retarder at fittings and elbows, form mastic so that fitting covers can be applied true and tight. Contractor may not install PVC jacket with polyurethane foam fill in lieu of vapor retarder at fittings and elbows without special approval by Owner.
In applications where a vapor retarder is required, Dyplast recommends that the vapor retarder be factory applied by an authorized fabricator to the outer surface of the pipe insulation.
Vapor retarder shall have a maximum permeance of 0.01 perm and shall be equivalent to Venture Wrap or Venture Clad products or Insulwrap 50 Laminated Vapor Retarder for Pipe Insulation. Refer to ASTM standards C-755 and C-1136 for information on selection and specification of vapor retarders. Refer to product literature and installation guidelines from the vapor retarder manufacturer for recommended application instructions.
Elbows and fittings shall be wrapped with vapor retarder tape with a 50% overlap.
For other laminated membrane type vapor retarders, consult manufacturer’s literature and installation guidelines.
Dyplast recommends that the vapor retarder be factory applied by an authorized fabricator.
For tanks, vessels, and equipment, use similar Vapor Retarder Films or approved equal.
Contraction/Expansion Joints
Contraction/expansion joints in single layer service shall be installed as the first layer is illustrated in Figure 5, or use an approved alternate design. The appropriate designer or engineer must specify the spacing of contraction/expansion joints separately for each system.
The location of contraction/expansion joints should be determined considering the expected pipe movements.
Contraction/expansion joints in double layer systems should be installed in the inner insulations layers of the horizontal piping and equipment.
The joints should be installed at maximum intervals of 17 feet. Consult with the appropriate engineer to determine the proper spacing of the contraction/expansion joints for each system.
Contraction/expansion joints should be filled with a resilient mineral fiber or approve alternate with fibers oriented parallel to the direction of the pipe. The contraction/expansion joint filler should be twice the thickness of the contraction/expansion joint (compressed as tight as possible). Consult with the appropriate engineer to determine the proper contraction/expansion filler material.
Protective Jacketing Material
Metal Jackets should be specified with a moisture retarder on the inside to provide 100% coverage and resist galvanic corrosion, common materials are 3 mil polysurlyn or 1-3 mil polycraft moisture retarders.
ISO-HT must have a PVC or metal jacket that is band secured before turning on the heat/steam. Banding for jacketing shall be 0.02" thick by 1/2" wide stainless steel on 9 inch centers.
For outdoor applications Jacketing shall be one of the following:
ALUMINUM
Jacketing shall be aluminum alloys 3003, 1100 or 3105, H-14 temper, meeting ASTM B-209. Use white painted aluminum jacketing for all outdoor applications. Consult jacketing manufacturer for recommended thicknesses. For outdoor applications aluminum jacketing should have a .024 inch thickness
Aluminum jacketing for all fittings, tees, elbows, valves, caps, etc. shall be sectional, factory contoured, or field-fabricated to fit closely around insulation.
Banding for jacketing shall be 0.02" thick by 1/2" wide stainless steel on 9 inch centers.
Aluminum protective jacketing shall not be considered a vapor retarder. See section 3.4 for vapor retarder recommendations.
No fastener capable of penetrating the underlying vapor retarder shall be used to secure the aluminum jacket.
STAINLESS STEEL
The material shall be of a quality meeting the requirements of ASTM A167 Type 304. Use white painted stainless steel jacketing for all outdoor applications. Consult jacketing manufacturer for recommended thicknesses. Typical minimal thickness for outdoor applications is 0.016 inches
Banding for jacketing shall be 0.02" thick by 1/2" wide stainless steel on 9 inch centers.
Stainless steel protective jacketing shall not be considered a vapor retarder. See section 3.4 for vapor retarder recommendations.
No fastener capable of penetrating the underlying vapor retarder shall be used to secure the stainless steel jacket.
Approved Suppliers include:
-
Standard Metal Industries, LLC (at www.smimetal.com)
- RPR Products, Inc. (at www.rprhouston.com)
For Indoor Applications
The minimal thickness recommended for aluminum jacketing installed indoors is 0.016 inches and for stainless steel 0.010 inches.
Jacketing shall be PVC material where frequent wash-downs are expected. Consult jacketing manufacturer for thickness recommendations. Typical thickness is 0.010 to 0.030 inch. Jacketing shall be tough and capable of enduring frequent wash downs with hot water and cleaning agents. All PVC jacket joints shall be solvent welded.
Solvent welds eliminate the need for banding over PVC jacketing.
PVC jackets are covered by ASTM C 921 and PVC jacketing temperature should be kept below 150 degrees F
Supply preformed PVC covers for all fittings, tees, elbows, valves, caps etc at the same thickness as PVC on straight pipe sections.
APPLICATION
Piping – General
Bottom insulation sections in hanger saddles shall be ISO-C1/3.0, 4.0, 6.0, or 10 Insulation for resistance to compression on pipe diameters 4” and greater. Depending on the saddle length and span chosen for a specific job, lower density insulation such as ISO-C1/2.0 insulation may be sufficient to be used as saddle insulation. Consult manufacturer for your specific scenario. Saddles shall wrap the insulation in an arc between 120° and 180° depending upon the load.
Single layer insulation shall be applied to piping with all joints sealed full depth with joint sealant and spread to uniform thickness so that joints appear tight and uniform. Refer to Figure 1 in Appendix B. In double layer insulation system, inner layer shall not be installed with sealants. In double layer systems inner and outer layer shall remain independent of each other so as to allow movement between the layers.
Insulation shall be secured with fiber reinforced tape prior to installation of the vapor retarder material when vapor retarder is field applied. A pipe coating system may be recommended to minimize the likelihood of pipe corrosion. Consult Appendix A for conditions where pipe coating systems are suggested.
ISO-HT should be applied on room temperature pipe and immediately secured with 2 wraps of ¾ inch filament tape on 9 inch centers!
Most high temperature systems require only one layer of ISO-HT insulation, yet the specifier/engineer may require more than one layer.
Stagger all longitudinal joints between the inner and outer layers. Install the inner and outer layer longitudinal joints 90° to each other with the inner layer joints in the 12 and 6 o’clock positions and the outer layer joints in the 3 and 9 o’clock positions. All butt joints between the inner and outer layers shall be staggered between 6 and 18 inches. Refer to Figure 1 in Appendix B.
Install pre-fabricated insulation fittings on elbows, tees, and valves. Insulation shall be the same thickness as pipe sections and fabricated with shiplap ends and shiplap or tongue and groove longitudinal joints. Refer to Figure 3 in Appendix B.
If a double layer system is required, all fittings shall be double layered. Fittings may be cut to full thickness in lieu of double layered if they are fabricated with shiplap butt ends. Depth of the shiplap shall be cut to the thickness of the inner layer to allow the outer layer to overlap creating a staggered joint.
In double layer insulation system, inner layer shall not be installed with sealants. In double layer systems the inner and outer layer shall remain independent of each other to allow movement between the layers. Refer to Figure 1 in Appendix B.
Insulation shall be secured with fiber reinforced tape on single-later systems, and on both inner and outer layers of a multi layered systems except as noted below. See Figure 4 in Appendix B.
Contraction/Expansion Joints shall be installed as described in section 3.5 and illustrated in Figure 5 in Appendix B or approved alternate design. The appropriate designer or engineer must specify the spacing of contraction/expansion joints separately for each system.
All insulation shall be tightly butted and free of voids and gaps at all joints. Vapor retarder must be continuous. All fasteners and bands shall be neatly aligned and overall work must be of high quality appearance and workmanship.
Vapor stops shall be used on either side of valves frequently removed for servicing, valve stations left exposed, or odd fittings, elbows, tees, etc. where the chance of moisture infiltration is high. Install per detail in Figure 6 in Appendix B or an approved alternate design.
Vapor Retarder Film should be cut to length longitudinally and wrapped around the circumference of the pipe with lap joint and installed facing downward avoiding the placement of the joint at the top or bottom of the pipe. Lap joint to be sealed using liquid adhesive. Butt joints shall be covered with Vapor Retarder Tape. Spiral wrap configuration can be used in lieu of the above installation. Spiral wrapping will require adhesive placed on one edge of the vapor retarder as it is wrapped over the previous layer.
Elbows and fittings shall be wrapped with Vapor Retarder Tape or covered with a mastic type vapor retarder product. Vapor Retarder Tape is to be wrapped in a spiral configuration. If using mastic type vapor retarder at fittings and elbows, form mastic so that fitting covers can be applied true and tight.
On factory applied Vapor Retarder Film, lap joint to be sealed with SSL tape. All vapor retarder surfaces should be cleaned and free of dust, grease, oil, etc before application of the SSL tape to ensure good adhesion between the tape and vapor retarder. Refer to Figure 7 in Appendix. For other types of factory applied vapor retarders, consult manufacturer’s recommendations on installation.
Before PVC or metal jacketing can be installed on a portion of the piping, the vapor retarder system on that portion must be complete and continuous.
It is good engineering practice to coat the pipes to prevent Corrosion under Insulation. Consult Appendix A for conditions where pipe coating systems are suggested.
Outdoor Piping
This section covers outdoor areas including, but not limited to, process areas, rooftops and rooftop equipment.
ISO-HT Insulation shall be protected from prolonged exposure to UV light and weather upon installation.
Outdoors, insulation materials with vapor retarders shall be covered with a jacketing material within two weeks of installation to eliminate long-term exposure to UV light.
Refer to section 3.6 for material specification on outdoor jacketing.
Outdoor jacketing overlap shall be a minimum of 2" at butt joints and a minimum of 2” at longitudinal joints. Jacketing shall be caulked before closing and banding and positioned in an orientation to avoid water infiltration.
Straight sections of jacketing shall be neatly secured with bands and seals with a maximum spacing of 9" on center. End joints shall be secured with bands and seals centered directly over joint. Do not use screws, staples or other fasteners on lines containing a vapor retarder system.
Tank, Vessel, and Equipment Insulation
All insulation materials shall be the same as those used on the pipe associated with the tank, vessel, or equipment.
Tank and vessel head segments shall be curved cut to fit in single piece or segments per ASTM C-450. Head segments shall be cut so as to eliminate voids at the head section and in a minimum number of pieces so as to eliminate through joints.
Curved segments shall be fabricated to fit the contour of the surface in equal size pieces to go around the vessel with a minimum number of through joints. Cutting in the field shall be minimized. All sections shall be tightly butted and free of voids and gaps.
Vertical vessels greater than 4 feet in diameter require an insulation support ring welded or bolted around the bottom of the tank to prevent the shell insulation from sliding down.
Seal all outer layer and single layer butt joints with joint sealer. Refer to section 3.3.
In multi-layer applications, the horizontal and vertical joints of the inner and outer layer curved segments shall be staggered (see Figure 8 in Appendix B).
The top of the outer layer of wall insulation in a multi layer system shall be held below the inner layer top a minimum of the insulation thickness. The tank head insulation layers shall be cut so as to meet the staggered joint.
Secure the shell insulation with stainless steel bands on 12 inch centers.
Dyplast recommends in cycling systems or where moisture can be present to use a factory applied vapor retarder installed by an authorized fabricator. If this is not possible, install Vapor Retarder Film. Tightly wrap the vessel or equipment insulation circumferentially with vapor retarder film. Overlap the seams by a minimum of 2 inches. Seal the overlapped seams with vapor retarder tape. On vertical vessels apply the vapor retarder film starting with the bottom course and work upwards. Each course should overlap on top of the one below it thus providing a joint that will naturally shed water.
The vapor retarder on curved head sections shall be mastic/fab/mastic or approved alternate. Flat head sections can be covered with vapor retarder film. Lap joints shall be covered with Vapor Retarder Tape.
Legs and appendages attached directly to the shell shall be insulated out from the vessel head or wall four times the insulation thickness and the insulation termination sealed with a vapor stop.
On outdoor equipment use aluminum jacketing per section 3.5. Rivets and screws shall not be used to attach jacketing on systems using a vapor retarder.
APPENDICES
APPENDIX A: CORROSION RESISTANT METAL COATINGS
GENERAL NOTE: Corrosion of metal pipe, vessels, and equipment under insulation, while not typically caused by the insulation, is still a significant issue that must be considered during the design of any mechanical insulation system. The propensity for corrosion is dependent on many factors including the ambient environment and the operating temperature of the metal. The recommendations below represent the general practice in the industry but are not meant to take the place of proper system design and specification by a qualified design engineer familiar with this type of construction. We recommend that the owner consult such an engineer and have them work closely with the fabricator, the contractor, and Dyplast to help insure a properly designed, installed, and long-lasting insulation system free of corrosion.
SPECIFIC RECOMMENDATIONS:
5.1.2.1 Stainless Steel All 300 series stainless steel shall be coated with an epoxy primer at 5 mil thickness and an epoxy finish coat at 5 mil thickness if operating in a temperature range between 140°F and 300°F or if in a cycling temperature service where the service temperature is between 140° and 300°F for more than 20% of the time. Consult a coating manufacturer for appropriate coating materials and application methods based on the operating temperature range of the equipment.
5.1.2.2 Carbon Steel All carbon steel operating at a service temperature between 32°F and 300°F or in cycling temperature service where the service temperature is between 32°F and 300°F for more than 20% of the time shall be at a minimum primer coated with an epoxy coating. Consult a coating manufacturer for appropriate coating materials and application methods for the operating temperature range of the equipment.
APPENDIX B: DETAILS
The following details are referenced in the text of this guideline by their Figure numbers. The diagrams included in this section are representative of details used within the industry. However, they are not intended to display the only accepted method of installation but to serve as an example of commonly used and acceptable practices.
Figure 1: DOUBLE LAYERED INSULATION SYSTEM
Notes:
• Inner Layer longitudinal joints at 12 and 6 O’clock. Outer layer joints at 3 and 9 O’clock.
• Stagger half round segments on each layer and between the two layers as shown above.
• Use thin coat of sealant over whole joint depth. Butter excess down the face of the joint. Use sealant on outer layer only.
Figure 2: FULL THICKNESS SHIPLAP ELBOW FITTING
Notes:
• Shiplap end cut to thickness “X” to accommodate double layer pipe insulation.
• Use in lieu of double layered fittings.
• Wrap elbow with Vapor Retarder Tape.
Figure 3: TAPING PATTERN
Notes:
• Use two wraps of tape to insure adequate bond.
• Use nylon or glass filament type tape 3/4” wide.
Figure 4: DOUBLE LAYER EXPANSION/CONTRACTION JOINT DETAIL
Notes:
• Allow sealant beads to cure prior to installation of outer layer.
• Position outer layer packed glass fiber between sealant dams on inner layer as shown above.
• After glass fiber in contraction joint is installed, insulation sections on either side of contraction joint shall be forced together as tightly as possible.
Figure 5: VAPOR STOP DETAILS
Notes:
• Mastic should be selected based on the service temperature of the system.
• Mastic shall be sealed to the pipe face and lapped back over the top of the vapor retarder if fitting is left exposed.
Figure 6: DETAIL OF FACTORY APPLIED VAPOR RETARDER
Notes:
• Vapor Barrier can be installed using SSL tape as shown above or using liquid adhesives.
• Butt joints to be covered a minimum of 1.5” on each side of joint by vapor retarder tape or butt strip.
Figure 7: TANK HEAD INSULATION DETAIL
Notes:
• In multiple layer systems, each layer shall be installed so that the horizontal and vertical joints in that layer are staggered from the corresponding joints in the preceding layer by half the height or width of a full section.
• At joint between wall and head section, the outer layer shall be staggered below the inner layer by the thickness of a single layer.
• Where mastics or sealants are required to bond the insulation sections to the tank head consult the manufacturer’s recommendations on service and application temperatures.
APPENDIX C: THICKNESS TABLE
We recommend you consult a qualified engineer and have them work closely with the contractor, and Dyplast to help insure a properly designed, installed, and long-lasting insulation system. Thickness calculations are performed using the 3E Plus software program that uses heat flow algorithms based on ASTM C680-95. The required insulation thicknesses do not include a safety factor. Actual operating conditions can vary. Consult a design engineer for an appropriate safety factor.
