1. SCOPE……………………………………………………………………..2. REFERENCES
3. REQUIREMENTS
3.1 General ………………………………………………………………..3.2
Cold and Hot Insulation (CH)
3.3
Cold Insulated with Sound Attenuation (CS)
3.4
Cold Insulated with Fire Protection (CF) ……………………
3.5
Covers and Windows
3.6
Polyisocyanurate (PIR)
4. MATERIALS ………………………………………………………………4.1
Insulation Materials
4.2
Accessories
4.3
Sealants ……………………………………………………………….
4.4
Cellular Glass Insulation
4.5
Polyurethane Insulation
4.6
Elastomeric Insulation …………………………………………….
5.
INSTALLATION
5.1 General
5.2
Insulation for Equipment …………………………………………
5.3
Insulation for Identification Plates
5.4
Insulation for Nozzles, Manways and Related Materials
6. VAPOR BARRIER ………………………………………………………6.1 General
6.2
Installation
7. WEATHERPROOFING ……………………………………………….7.1 General
7.2
Installation
7.3
Installation of Metal Jacket………………………………………
8. CONFLICTS AND DEVIATIONS
9. SHIPPING AND STORAGE
TABLE
I
Hot Insulation Materials ………………………………………………
II Cold Insulation Materials
1. Scope
This standard provides the minimum requirements for the design and installation of external insulation on
hot or cold surfaces of equipment.
2. References
Reference is made in this standard to the following documents. The latest issues, amendments, and
supplements to these documents shall apply unless otherwise indicated.
SABIC Engineering Standards (SES)
B02-S03 Specification for Fireproofing of Structural Steels and Vessel and Pipe Supports
N01-F01 Insulation Systems for Hot Equipment. 60-648 °C (140-1200 °F) – Potential Exposure to Water
N01-F02 Insulation Systems for Hot Equipment. 60-648 °C (140-1200 °F) – No Exposure to Water
N01-F03 Insulation Systems for Cold and Dual Temperature Equipment -73 to +121°C (-100 to +250 °F)
N01-F04 Insulation Systems for Equipment. 2-149 °C (35-300 °F) – Potential Exposure to Water
N01-F05 Insulation Systems for Equipment. 2-121 °C (35-250 °F) – No Exposure to Water
N01-S01 Index of Insulation Materials
N01-S06 Thermal Insulation Material Thickness
Q01-F23 Insulation and Fireproofing Supports
American Society for Testing and Materials (ASTM)
A 167 Stainless Steel and Heat Resisting Chromium Nickel Steel Plate, Sheet, and Strip
A 480 Standard Specification for General Requirements Flat Rolled Stainless and Heat Resistant
Steel Plate, Sheet, and Strip
B 209 Specification for Aluminum Alloy Sheets and Plates
C 195 Specification for Mineral Fiber Thermal Insulating Cement
C 240 Standard Test Methods of Testing Cellular Glass Insulation Block
C 449 Specification for Mineral Fiber Hydraulic Setting Thermal Insulation and Finishing Cement
C 450 Recommended Practice for Prefabrication and Field Fabrication of Thermal Insulating Fitting
Covers for NPS Piping, Vessel Lagging, and Dished Head Segments
C 534 Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and
Tubular Form
C 547 Mineral Fibers Preformed Pipe Insulation
C 552 Standard Specification for Cellular Glass Thermal Insulation
C 585 Practice for Inner and Outer Diameters of Rigid Thermal Insulation for Normal Size of Pipe
and Tubing (NPS) System
C 591 Specification for Unfazed Preformed Rigid Cellular Polyurethane Thermal Insulations
C 592 Specification for Mineral Fiber Blanket Insulation and Blanket-Type Pipe Insulation
(Metal-Mesh Covered)
C 612 Specification for Mineral Fiber Block and Board Thermal Insulation
C 795 Wicking Type Thermal Insulation for Use Over Austenitic Stainless Steel
C 871 Methods for Chemical Analysis of Thermal Insulation Materials for Leachable Chlorides, Fluorides,
Silicate, and Sodium Fiber
C 892 Specification for High-Temperature Fiber Blanket Thermal Insulation
E 84 Surface Burning Characteristics of Building Materials
E 96 Water Vapor Transmission of Material in Sheet Form
3. Requirements
3.1 General
3.1.1 The external surfaces of equipment and tankage shall be insulated to conserve energy by reducing
heat loss or gain and to facilitate temperature control of a process system. See SES N01-F01 to N01-F05.
3.1.2 When equipment is released for installation of insulating material, its design thickness shall be
verified in accordance with the operating temperature and diameter, as indicated in SES N01-S06. If
thickness does not verify, vendor shall contact SABIC to resolve the conflict. The vendor shall not in any
case establish a new thickness.
3.1.3 Equipment shall be insulated under the following operating conditions:
a. Hot Insulation: A surface temperature above 60 °C (140 °F).
b. Cold Insulation: More than 10 percent of time below the atmospheric dew point.
3.1.4 Multiple layer insulation systems shall be used for operating temperatures below -50 °C (-58 °F), or
when the insulation thickness exceeds 50 mm (2 in).
3.1.5 Personnel protection shall be provided on operating equipment when the surface temperature is
greater than 60 °C (140 °F). When insulation is not required for heat conservation, the protection may be
provided by suitable metal guards, shields or railings. This requirement applies to surfaces within 600 mm
(24 in) horizontally and to a height of 2.1 m (7 ft) above any area that is routinely used as work space or
access way.
3.1.6 Structural attachments shall be insulated to a thickness based on the fluid temperature of equipment
to which they are attached.
3.1.7 Insulation thickness shall be selected to maximize the net present value considering initial
investment costs, maintenance costs, energy costs, heat transfer, project life, and the time value of money.
Design ambient conditions shall be obtained from SABIC.
3.1.8 Jacket emission values used to determine the heat transfer shall be for weathered service
conditions.
3.1.9 Acoustical insulation shall be used where required. It shall be fibrous glass 128-160 kg/m3
(8-10 Ib/ft3
) or mineral fiber 128-160 kg/m3
(8-10 lb/ft3
), unless otherwise specified.
3.1.10 On all equipment that is subject to vibration, a 25 mm thick layer of fiber glass blanket shall be
installed over the entire surface. It shall be covered with polyisocyanurate. 25 mm thick fiber glass blanket
shall be in addition to polyisocyanurate thickness from the table in SES N01-S06.
3.1.11 A minimum clearance of 50 mm shall be provided between the outer surface of insulation and
obstructions, for example structural steel, conduits, or other insulated or fireproofed surfaces.
3.1.12 Removable or flexible type insulation shall be used in areas where access for frequent maintenance
is necessary. The insulation shall be bonded to the removable cover.
3.1.13 The operating temperature shall be within the temperature limits for the selected insulation material
and accessories, as recommended by the manufacturer.
3.1.14 Insulation materials to be used with stainless steel shall be inhibited with sodium metasilicate to a
ratio of inhibitor to halogen ions not less than 10 to 1 as specified in ASTM C 871.
3.1.15 Insulation containing sodium silicate shall not be used over alloys containing molybdenum, for
example 316 stainless steel, Hastelloy-X and Inconel 625, operating at 815 °C (1500 °F) or above.
3.1.16 Contact between dissimilar materials which might cause galvanic corrosion shall be avoided.
3.1.17 Non-metallic materials shall have a flame-spread rating of not greater than 25 when tested in
accordance with ASTM E 84.
3.1.18 Fireproofing shall be in accordance with SES B02-S03 and Q01-F23.
3.1.19 Finished insulation and weatherproofing work shall be installed weathertight and shall remain
weathertight during operation.
3.2 Cold and Hot Insulation (CH)
3.2.1 Insulation for cold and hot temperature shall consist of two insulation materials with an inner layer of
glass fiber and an outer layer of cellular glass. Polyisocyanurate (PIR) shall not be used in cold and hot
insulation applications.
3.2.2 Inner layer shall be 40 mm thick glass fiber blanket and shall be secured with bands.
3.2.3 Outer layer(s) shall be cellular glass (preformed and curved block) sized to fit over the glass fiber
blanket.
3.2.4 The thickness of cellular glass shall equal the thickness shown for operating temperatures as given
in SES N01-S06 but it shall not be less than 50 mm thick.
3.2.5 Tables I and II list recommended insulation materials (systems) with their temperature limits.
Equivalent materials conforming to other national standards require submittal of mechanical and thermal
properties and chemical analysis data for SABIC approval.
3.3 Cold Insulated with Sound Attenuation (CS)
3.3.1 Cold insulation shall be installed first as detailed in this standard. Mineral wool insulation shall be
installed over cold insulation. Mineral wool insulation shall not be installed until vapor barrier is dry to
touch.
3.3.2 The insulated surface shall be covered with lead-lined aluminum jacket.
3.3.3 Installation of mineral wool or acoustical metal jacket or both shall not damage vapor barrier either
during installation or in service.
3.4 Cold Insulated with Fire Protection (CF)
3.4.1 Equipment which requires cold insulation as well as fire protection shall be insulated with minimum
100 mm (50 mm + 50 mm) thick cellular glass. Polyisocyanurate (PIR) shall not be used where fire
protection is required.
3.4.2 Hydrocal B11 with reinforcing fabric shall be applied over inner layer(s) of insulation.
3.4.3 Outer layer of insulation shall be applied with joint sealer and vapor barrier as detailed in this
standard.
3.4.4 Metal jacketing shall be 0.6 mm thick Type 304 stainless steel.
3.5 Covers and Windows
3.5.1 Removable insulated covers shall be provided for manholes and designed in a way that their
removal shall not disturb the surrounding permanently fixed insulation.
3.5.2 Removable insulation window plugs shall be provided to permit on-stream ultrasonic inspection
when required. Plugs shall be vapor tight, ultra violet (UV) resistant, and able to be opened and reclosed.
3.5.3 Window plugs shall be 65 mm diameter.
3.5.4 On vessels, windows shall be at each platform close to manways, but clear of the reinforcing pad,
and on the head. On tanks, windows shall be provided on each course close to the stairway.
3.6 Polyisocyanurate (PIR)
Polyisocyanurate shall be used as an insulation material for Cold and Anti-Sweat service. See also 4.4.1.
4. Materials
4.1 Insulation Materials
4.1.1 The insulation products referenced in SES N01-S06 are recommended. Equivalent insulation
product shall be approved in writing by SABIC.
4.1.2 Materials, for example insulation, adhesives, sealers, jackets and fasteners shall conform to
SES N01-S01.
4.1.3 Insulation and fireproofing supports shall conform to SES Q01-F23.
4.1.4 Insulation materials shall be chemically inert, rot-proof, vermin proof and non-injurious to health.
4.1.5 Insulation materials shall be asbestos-free.
4.1.6 Detailed material specifications and manufacturer’s product data sheets for the selected materials,
together with samples of major insulation materials shall be provided for SABIC approval. Materials shall
only be purchased in strict accordance with these approved documents.
4.1.7 Only proven stress-corrosion safe insulation material shall be applied on stainless steel. Insulation
materials to be used on austenitic stainless steel shall contain less than 50 ppm leachable chlorides and
more than 20 ppm sodium silicate for each ppm of leachable chlorides and shall meet ASTM C 795 for safe
use over stainless steel.
4.1.8 Chemical analysis of insulation materials for leachable chlorides, fluorides, silicate and sodium ions
shall be in accordance with ASTM C 871.
4.1.9 Insulation materials shall be certified by the manufacturers as being suitable for use on austenitic
stainless steel.
4.2 Accessories
4.2.1 Accessories shall be certified by the manufacturers as being suitable for use on austenitic stainless
steel.
4.2.2 Components, for example jackets, bands, screws, and rivets, shall not be subject to galvanic
corrosion, and shall not be plated or clad for corrosion protection, for example by galvanizing or
zinc-plating.
4.2.3 Insulation support rings, pins, clips, studs, and accessories shall be of materials compatible with the
components to which they are attached, and if welded, shall be installed by the fabricator prior to post-weld
heat treatment unless specifically permitted otherwise by SABIC.
4.3 Sealants
Sealants shall; contain 90 percent or greater solids; be butyl or silicone rubber based; remain flexible
without cracking or shrinkage at specified environmental conditions; be resistant to solar radiation; have a
water vapor permeability of 0.03 perm-in or less as specified in ASTM E 96, Procedure E; and have a
flame spread classification of 25 or less as defined in ASTM E 84.
4.4 Cellular Glass Insulation
4.4.1 Cellular glass is an option that shall be considered for Cold and Anti-Sweat services. Cellular glass
with glass fiber inner blanket shall be used for hot and cold temperature services. Cellular glass shall be
used for inside and outside of the skirt and shall be fireproofed. Cellular glass shall be used on skirts from
top of concrete fireproofing ring to point of attachment on equipment insulated with polyisocyanurate.
4.4.2 Cellular glass insulation shall be coated on the inside surface of the skirt with a bedding compound,
for example Hydrocal B-11, in severe vibration or cyclic service.
4.4.3 Elastomeric coatings are required over cellular glass, even when metal jackets are provided.
4.4.4 Cellular glass systems shall conform to 4.5.3.
4.4.5 Layers of cellular glass insulation in cold service shall be sealed at all joints.
4.4.6 Contraction joints are required to accommodate design conditions.
4.4.7 Cellular glass insulation shall be tested in accordance with ASTM C 240.
4.5 Polyurethane Insulation
4.5.1 Polyurethane foam, foam-in-place or spray applications shall be approved by SABIC. Installers shall
have previous commercial experience and shall supply references to SABIC prior to being granted
authorization to work.
4.5.2 Elastomeric coatings shall be used on polyurethane, and other foams, where there is a requirement
for metal jackets.
4.5.3 The vapor barrier type for foamed-in-place urethane shall be reviewed and approved in writing by
SABIC prior to use. The vapor barrier shall have a water vapor transmission rating less than 1.6 metric perms (0.02 perms) in accordance with ASTM E 96 when tested at 23 °C (73 °F). Fabric reinforcement of
elastomeric coatings shall be required. A metal jacket does not qualify as a vapor barrier.
4.5.4 Polyurethane insulation shall have a flame spread classification of 25 or less as defined in
ASTM E 84.
4.5.5 Test procedures shall be established to verify dimensional stability. The procedures are subject to
SABIC review and approval.
4.6 Elastomeric Insulation
Elastomeric insulation used outdoors shall be resistant to ultra violet exposure, or coated according to the
insulation manufacturer’s instructions.
5. Installation
5.1 General
5.1.1 Insulation shall not be applied to vessels or other stationary equipment until they have been
inspected, tested, approved, and released for the application of insulation by SABIC. In cases where it is
necessary to insulate before completing this work, prior written approval shall be obtained from SABIC.
5.1.2 Material installation procedures including detailed installation drawings shall be provided for SABIC
approval. The drawings shall indicate the exact position and use of the approved materials. Materials shall
be installed in accordance with these approved documents.
5.1.3 Unless otherwise specified, manufacturer’s recommendations shall be adhered to in application and
handling of the materials.
5.1.4 Insulation shall not be installed prior to testing and inspection of equipment and vessels.
5.1.5 Welding of studs or nuts for insulation on equipment is prohibited without prior written approval of
SABIC.
5.1.6 No field welding will be permitted on lined vessels, coated vessels and equipment which has been
pressure tested.
5.1.7 Insulation shall not be installed over field welds and other surfaces which require painting but have
not been leak tested and painted.
5.1.8 Nameplates shall be attached with extended brackets to give adequate clearance for full insulation
thickness, and insulated as detailed in 5.3.
5.1.9 Surfaces to be insulated shall be dry, free from frost and condensation and hand-cleaned by the
insulation applicator to the extent of removing loose rust, loose paint film, salt, dirt, grease, oil, moisture, or
other foreign matter prior to application of insulation materials. Stainless steel items shall be brushed with
stainless steel brushes only.
5.1.10 Damaged painting shall be repaired according to applicable specification prior to application of
insulation material.
5.1.11 Metallic protrusions through the insulation shall be fitted with minimum gap between metal and
insulation and shall be sealed tight by applying joint sealer between protrusion and insulation.
5.1.12 The insulation shall be protected from moisture and weather before and during application. Special
precaution may be necessary during rainy weather installations.
5.1.13 After the field installation of equipment, any damaged insulation shall be repaired before installing
insulation at the tie-ins.
5.1.14 Insulation sections shall be trimmed and tightly butted to eliminate voids, gaps, or open joints. Joint
sealer shall not be used to fill these imperfections. The insulation shall be refitted to achieve tight fit.
5.1.15 Tapes and bands shall be tightened enough to ensure complete closure and sealing of joints.
Stainless steel bands shall be used where tapes cannot achieve tight sealed joints.
5.1.16 The tightening of bands or tapes shall not crush or crack the insulation. Cracked or broken
insulation shall be replaced.
5.1.17 Materials applied in one day shall have the vapor barrier applied as soon as practical the same day.
Exposed insulation shall be temporarily protected with a combination moisture and UV barrier, for example
black polyethylene film to keep out sun, moisture, and rain water. The film shall be sealed to equipment
with chloride-free adhesive tape.
5.1.18 Multiple layers of insulation shall be installed in a way that the circumferential and longitudinal joints
of one layer do not coincide with those of any other layer. Minimum overlap for joint stagger shall be
150 mm.
5.1.19 Layers of insulation shall not be bonded to each other.
5.1.20 A vapor sealing joint sealer shall be applied to all joints of outer layer in multi-layer installations and
to all joints of single layer insulation. Joint sealer shall cover entire thickness of butt joints of insulation.
5.1.21 Vapor stops shall be utilized for all equipment insulation. Vapor stops shall be located at all
protrusions through the insulation system. Vapor stops shall be applied with reinforcing membrane.
5.1.22 Excessive sealer in the joints shall be avoided during application. Do not feather edge.
5.1.23 Mastics shall not be applied within 24 hours of ambient air temperature falling below 4.4 °C.
5.2 Insulation for Equipment
5.2.1 For equipment requiring a shipping saddle, the insulation shall be terminated at least two feet away
from the saddle, and vapor stop shall be installed.
5.2.3 Curved insulation blocks with minimum number of field joints and conforming to the curvatures of the
surfaces shall be fitted to the equipment surface. Cutting of insulation block in the field shall be minimized.
5.2.4 Joint sealer shall be applied between attachment and protrusions of the vessels and insulation.
5.2.5 Curved segment insulation shall be applied with length of segment parallel to greatest length of
surface to be insulated.
5.2.6 Curved segment insulation shall be applied in a way that all successive end joints are staggered.
5.2.7 Segments applied to curved surfaces shall be sized to eliminate gaps between surfaces and
segments.
5.2.8 Curved segment insulation shall be applied in multiple layer construction, when required.
5.2.9 Joints in second layer shall be staggered with those of first layer by at least half a block.
5.2.10 Layers shall be secured with bands before the succeeding layer is applied.
5.2.11 Inner layers of insulation shall be fastened with 13 mm wide stainless steel bands and seals spaced
on 300 mm centers.
5.2.12 The outer layer or single layer insulation shall be fastened with the use of the following bands on
300 mm centers.
a. T-304 bands 13 mm x 0.5 mm for shells 760 mm and smaller in diameter
b. T-304 bands 19 mm x 0.5 mm for shells exceeding 760 mm in diameter
5.2.13 Insulation joints shall be fitted tight. Ends of insulation shall be rubbed against each other prior to
application of joint sealer.
5.2.14 Contracting joints on vertical equipment shall be installed at every support ring, while for horizontal
equipment, it shall be installed midway between saddles and on 9 m centers thereafter.
5.2.15 The contraction space below the underside of the ring and the insulation shall be packed with
fiberglass insulation.
5.2.16 Contraction joints at insulation supports, shall be filled with fiberglass insulation of 16 kg/m3
density
which shall be composed of 75 mm of uncompacted fiberglass insulation compacted to 25 mm.
5.2.17 A strip of butyl rubber 45 mil thick, 125 mm wide shall be installed and fastened over the
contraction joint with two stainless steel 19 mm bands. The rubber strip shall be installed after application
of vapor barrier, and overlap shall be sealed with butyl rubber adhesive. Additional reinforced vapor barrier
mastic shall be carried over the ends of butyl rubber.
5.2.18 Vessel head insulation shall be curved block in both directions to fit contour of the vessel head
(double contoured prefabricated head).
5.2.19 For top head of vertical equipment, and both heads of horizontal equipment, the insulation shall be
secured using a floating ring fabricated from 10 mm carbon steel rod or 16-gage T-304 stainless steel wire
consisting of six wires twisted together. The floating ring shall be laid over the insulation and positioned in
the center of the head so as not to touch nozzles or other metal.
5.2.20 19 mm wide hold-down bands shall be installed and shall be spaced on 300 mm centers measured
around the circumference of the equipment.
5.2.21 One end of a band shall be fastened to the floating ring and the other end shall be anchored to a
band(s) or ring welded around the cylindrical section of the equipment close to the head.
5.2.22 The insulation on bottom head of vertical equipment shall be secured by 19 mm wide bands on
maximum 300 mm centers measured around the equipment’s circumference.
5.2.23 On vertical vessels which are skirt supported, the bands on the bottom head shall be attached to
the inside skirt support angle or blank nuts.
5.2.24 Insulation on the outside and inside of skirts shall be the same as the shell insulation thickness. For
fireproofed skirt, cellular glass insulation shall be installed in lieu of polyisocyanurate from point of
attachment to bottom insulation support ring.
5.2.25 Skirts shall be insulated from the point of attachment to a distance of at least four times the
insulation thickness.
5.2.26 Exposed insulation at the skirt shall be sealed and flashed to prevent the intrusion of moisture.
5.2.27 The insulation resting on bottom support ring shall be sealed with joint sealer through the full
thickness of insulation.
5.2.28 The insulation supports shall be furnished and installed by the equipment supplier.
5.3 Insulation for Identification Plates
Identification, for example code inspection plates, stampings, nameplates, and data plates, on equipment
shall be covered with removable vapor sealed insulation plugs. If duplicate plate is provided, it shall be
installed outside the jacketing without damaging the vapor barrier.
5.4 Insulation for Nozzles, Manways and Related Materials
5.4.1 Manways, clean out holes, handholes, and inspection holes shall be insulated in the same manner
as valves and flanges.
5.4.2 Contact surfaces of removable insulation covers shall be sealed with joint sealer through entire
thickness of the contact surface and the external surfaces shall be sealed with continuous vapor barrier.
5.4.3 The accessible opening shall have removable metal boxes.
5.4.4 The removable feature shall not disturb equipment insulation or vapor barrier and shall cause
minimum damage to insulation.
5.4.5 Thickness of insulation on attachments and projections without high density insulation block shall be
the same as the adjoining insulation and shall extend along the projection a minimum of two times the
insulation thickness for lines and equipment operating above 0 °C, and four times the insulation thickness,
for lines and equipment operating at 0 °C and below.
5.4.6 Extent of insulation on attachments with high density polyurethane block shall be up to and including
the polyurethane blocks. The vapor barrier shall be extended over to uninsulated parts of steel.
5.4.7 Vapor barrier on attachments shall be extended additional 150 mm over uninsulated surface.
5.4.8 For attachments which have high density polyurethane blocks, for example vessel clips, ladder
supports, platform supports, and dummy legs, vessel insulation shall be extended up to the insulation
block, and the reinforced vapor barrier shall be extended over the insulation block onto the metal plate.
5.4.9 A metal box shall be built around these attachments to protect vapor barrier.
6. Vapor Barrier
6.1 General
6.1.1 Where metal jackets are not required, the vapor barrier shall be capable of providing weatherproof
protection.
6.1.2 Plastic coatings shall be used on insulating cement finishes to prevent the ingress of water on
non-fireproofed systems.
6.1.3 A vapor barrier mastic with a water vapor transmission rating not exceeding 1 perm shall be used to
coat insulating cement.
6.2 Installation
6.2.1 Insulation shall be dry and free from moisture prior to application of vapor barrier.
6.2.2 Metal bands or wires shall not be used over non-metallic vapor barrier.
6.2.3 The entire outer surface of cold insulation shall be vapor sealed with reinforced vapor retardant
mastic. The mastic shall only be applied on surfaces that are thoroughly dry, regular, even, and without
major voids, crevices or indentations.
6.2.4 Reinforced vapor retardant mastic shall be applied to a minimum total dry (cured) film thickness of
1.2 mm.
6.2.5 Wing seals shall be covered by either tape or joint sealer to smooth out the projections.
6.2.6 An initial coat of gray color mastic shall be applied by trowel or glove to a minimum wet film thickness
of 0.8 mm. The first coat shall completely fill minor voids, depressions at joints, and other such
imperfections.
6.2.7 A layer of reinforcing membrane shall be embedded into initial coat while coat is still wet. The
membrane be laid smooth to eliminate wrinkles and lapped at all seams by at least 100 mm.
6.2.8 Before the first coat of vapor retardant mastic has dried to the touch, a second uniform coat of white
color mastic shall be applied to provide a minimum wet film thickness of 1.6 mm. The embedded
membrane shall be completely coated and shall show minimum profile.
6.2.9 After the first two coats have set, the finish coat of gray color mastic shall be applied to a minimum
wet thickness of 1.2 mm. Trowelling to a uniform surface finish shall be carried out before solvent
evaporation causes the surface to skin.
6.2.10 Vapor retardant mastic shall be carried from outer surface of insulation to the uninsulated metal
parts of vessel as detailed in 5.4.7 to provide vapor seals at all terminations, projections, nozzles and caps.
6.2.11 The reinforcing membrane shall be fully covered with mastic and there shall be no cracks, holes,
thin spots, or open joints in the vapor barrier.
6.2.12 The vapor retardant mastic shall be allowed to dry according to manufacturer’s recommendations
before application of metal jacketing.
6.2.13 Finished vapor barrier shall be inspected for thickness, thin spots and pinholes, cracks, and other
imperfections. Unsatisfactory areas shall be repaired.
7. Weatherproofing
7.1 General
7.1.1 Metal jacketing shall be installed over all insulated surfaces.
7.1.2 Jackets for insulation systems that require fireproofing shall be stainless steel.
7.1.3 Metal jackets shall be used in non-fire hazardous areas if within process plant battery limits.
7.1.4 Non-metallic or metal jackets may be used outside process plant battery limits, for example offsites
where fireproofing is not required.
7.1.5 Non-metallic jackets shall have a flame spread classification of not greater than 25 as determined by
ASTM E 84, have a proven resistance to solar radiation and be compatible with the insulation system.
7.1.6 Elastomeric coatings shall be used for weatherproofing on plastic foam and cellular glass when
there is no requirement for metal jackets.
7.1.7 Aluminum jacketing shall not be used over insulation on; equipment whose maximum, normal, or
short term operating temperature exceeds 593 °C; equipment insulated for fireproofing; and over stainless
steel equipment in hot service. Stainless steel jacketing without moisture barrier shall be used above
593 °C. Stainless steel jacketing materials shall conform to ASTM A 167 and A 480.
7.2 Installation
7.2.1 Openings in the jacket for, for example nozzles, brackets, and protrusions shall be cut as close
possible to achieve a tight fit. Silicone based caulking compound shall be used to seal all the projections.
7.2.2 Penetration of the metal jacketing shall be flashed and sealed to prevent the entrance of moisture.
7.2.3 The equipment shall be at either four o’clock or eight o’clock position to shed rain water.
7.3 Installation of Metal Jacket
7.3.1 Aluminum smooth sheet 0.6 mm thick (ASTM B 209) shall be used for:
a. All horizontal equipment, vessel heads, manways, nozzles, and flashing.
b. Vertical equipment below 760 mm in diameter.
c. All vertical equipment 760 mm and above. Aluminum sheet shall be 30 mm corrugated.
7.3.2 Stainless steel jacketing 0.5 mm thick by 30 mm corrugated shall be used over insulated portion of
vessel skirt and shall extend 300 mm above point of attachment.
7.3.3 Jacketing for horizontal and vertical cylindrical surfaces shall be applied with 75 mm circumferential
and longitudinal laps, except 30 mm corrugated jacketing shall be lapped a minimum of two corrugations.
7.3.4 Metal jacketing for vessel heads shall be one piece dish, or conical sections fitted to the insulation,
or a single flat sheet bent at the edges for small diameter vessels. Head covers shall overlap the shell
jackets by 100 mm. Removable covers shall be provided for the flanges of removable heads.
7.3.5 Head jacketing shall be fastened by means of 19 mm x 0.5 mm stainless steel band, one for every
gore.
7.3.6 Metal jacketing on horizontal and vertical vessels up to 760 mm diameter shall be secured with
13 mm wide by 0.5 mm stainless steel T-304 bands spaced on 300 mm centers, and shall conform to
ASTM A 167.
7.3.7 Metal jacketing on horizontal and vertical vessels above 760 mm diameter shall be secured with
19 mm wide by 0.5 mm thick stainless steel T-304 bands spaced on 300 mm centers.
7.3.8 Pop rivets shall be used for securing metal jacket where necessary, for example on vessel heads.
75 mm wide by 0.6 mm thick aluminum strip shall be installed as a liner under jacket where pop rivets shall
be used. The liner is not required under 30 mm corrugated metal if holes are on the ridge of corrugations.
If rivets are used for jacketing securement, rivet holes shall be predrilled on the ground.
7.3.9 Metal jacketing on vertical equipment shall be supported by ‘S’ clips on 300 mm centers.
7.3.10 Circumferential lap shall have one band on overlap and intermediate bands shall be installed on
300 mm centers.
7.3.11 When metal band length exceeds 7.6 m between securement points, one breather (expansion)
spring shall be used for every 7.6 m of band length.
7.3.12 Bands on vertical jacketing shall be held in place by ‘U’ clips. ‘U’ clips shall be on 1200 mm centers.
The ‘U’ clips shall be secured with rivets installed at the ridge of corrugations.
7.3.13 Projections through the insulation jacket, for example nozzles, manways, supporting brackets,
sample connections, thermowells, and miscellaneous fittings, shall be sealed using silicone base caulking
compound. A bead of sealing material shall also be installed at each metal gore seam on vessel head and
gored elbow.
7.3.14 Weatherproofing shall be inspected for specified band spacing, overlaps, caulking, U and S clips.
7.3.15 One additional coat of vapor barrier mastic as weather barrier mastic shall be applied to irregular
surfaces and other surfaces where application of metal is not practical.
7.3.16 Weather barrier mastic shall cover all exposed vapor barrier mastic and shall extend a minimum of
100 mm under adjacent metal jacketing.
7.3.17 Weather barrier mastic shall be applied to a minimum dry cured thickness of 0.4 mm (1.2 mm wet
film thickness).
7.3.18 There shall be no cracks, holes, thin spots or open joints in the weather barrier.
8. Conflicts and Deviations
8.1 Any conflict(s) between this standard, SES and industry standards, engineering drawings, and contract
documents shall be resolved at the discretion of SABIC.
8.2 Deviations providing less than the minimum requirements of the standard require written approval from
SABIC.
8.3 All substitutions shall be described in sufficient detail with reason for change. Cost impact and data
sheet shall accompany substitution request.
9. Shipping and Storage
9.1 When polyisocyanurate (PIR) materials in the form of bun-stock or preformed shape are transported by
ship, protection against salt spray and weathering shall be provided by wrapping buns in black
polyethylene. Preformed PIR shapes shall be shipped in cardboard containers.
9.2 Insulation blocks, mastics, adhesives and weatherproofing shall be delivered to jobsite in
factory-sealed cartons, containers, and packages. Materials shall be new.
9.3 Materials shall be kept dry and protected from rain while in storage and during application, according to
manufacturer’s recommendations. Damaged material shall be replaced by insulation vendor at no cost to
SABIC.
9.4 Adhesives and mastics shall be stored in the shade and when possible or required by manufacturer, in
an air-conditioned storehouse. Container covers shall be immediately replaced when usage is interrupted.
Covers shall be replaced securely to prevent air leakage.
TABLE I
Hot Insulation Materials
TABLE II
Cold Insulation Materials
