FROSIO InsulationCladding and Weather Protection

Cladding and Weather Protection

2021-11-29•Version 0.2

Introduction

Cladding and weather protection shall protect against:

Water penetration
Weather & Wind
Mechanical protection
Fire
Personnel protection

Based on a facility that is in a corrosive environment, a corrosion resistant quality or seawater-resistant aluminium is usually used. Tape systems are also used, and new products are being developed. In Norway, the following systems have traditionally been accepted:

For Class 5 fire insulation, a corrosion resistant steel cladding shall be used (SS316)

Non-metallic cladding and aluminium can be used for all classess except class 5
Perforated metal cladding of corrosion resistant steel is used for personnel protection class 3. Applies if temperature is below -10°C or above +70°C, and in walkways and areas with vertical distance is 2,1 meters and horizontal distance is 0,8 meter
Aluzinc can be used onshore where there is a low risk of corrosive environment
Materials used must be approved by purchaser

Metal cladding

Stainless steel panels (type AISI 316, 2D finish)
Aluminium panels (type AIMn1 or with similar corrosion resistance)
Aluzinc panels (type hot dip galvanized steel with an aluminium and zinc alloy. The weight of the galvanizing shall be g/m²)

Non-metallic cladding

Jackets (mainly for valves and flanges)
Various building and ceiling panels in HVAC
Tape
Epoxy based materials
Painted or coated fiberglass cloth (not used today)
Vulcanized products

Stainless steel cladding

Shall be of ASIS 316 quality or better
Can be used for all insulation classes, inclusive class 5
Maximum surface temperature is 900 °C
At surface temperature >500 °C a colour change of the material may occur
«D» finish shall be used

Minimum thickness of cladding:

DN ≤ 250 mm = 0,5 mm
DN > 250 mm - 900 mm = 0,7 mm
DN > 900 mm = 0,9 mm

For fire insulation, the tested thicknesses shall be used.

Aluminium cladding

Maximum continuous surface temperature is 350°C
Shall not be used on class 5
At a surface temperature >150°C the material may deform
Short lifetime in areas with high humidity and high salt concentration
Minimum thickness of cladding:
- DN ≤ 450mm = 0,7mm
- DN > 450mm = 0,9 mm

Aluzinc cladding

Maximum surface temperature is 700 °C
At surface temperature >310 °C, colour change of the material may be observed
According to NORSOK M-004, minimum cladding thickness shall be:
- DN ≤ 300 mm = 0,6 mm
- DN > 300 mm = 0,8 mm

For tanks and vessels, minimum thickness shall be 1,0 mm
If NORSOK M-004 is used, it opens for use of Alu-Zinc in the following areas:
- Aluzinc can be considered for onshore facilities with low risk of corrosive environment
- Aluzinc cladding shall be of type hot dip galvanized steel with an aluminium and zinc alloy in accordance to ISO 9364 or EN 10215. The weight of the galvanizing shall be 185 g/m².

Cladding of horizontal pipes

DN ≤ 250 mm = 0,5 mm
DN > 250 mm - 900 mm = 0,7 mm
DN > 900 mm= 0,9 mm

Use of steel banding

SS316 band, ½”: Dimension < DN1500 (pipes)
SS316 band, ¾”: Dimension > DN1500 (tanks)
All weather protection shall be secured with SS316 band, 5 pieces per meter/4 per capsule.

Non-metallic cladding products

Non-metallic cladding can be used as metallic cladding except for class 5 in NORSOK M-004
Some products have been tested and approved for class 5
Use of non-flammable cladding in closed areas shall on the basis of HSE be accepted by purchaser.

PVC tape can be used as cladding in naturally ventilated areas
PVC shall not be used in arear where there is sensitive electrical equipment or in proximity to electronic switchboards due to gasses formed in case of fire
Minimum/maximum surface temperature: see technical data sheet for relevant product
Tape - or coated systems shall be approved by purchaser

I Norway, different tape systems have been used and the following requirements for non-metallic cladding must be met. All testing shall be done on approved facility.

Property	Test method	Requirement
Heat dissipation	ISO 5660-1	Values to be given
Spread of flames/surface fammability	IMO Resolution A.653 (16)	Self-extinguishing when exposed to 5 kW/m²
Smoke and toxicity	IMO Resolution MSC 41(64)	Smoke D_m= .1 Toxic gasses within limits give in IMO Res MSC41 (64)
Aging	ISO 20340 (4200 timer)	Less than 70% loss of gloss. Material must maintain 90% of its stregth and elongation properties after aging test.
Tensile strength	ISO 37	≥ 6,9 MPa
Elongation at break	ISO 37	≥ 10 %
Shear strength (overlap)	Recognized international standard	Min. 50 kPa after 24 hours degassing time
Adhesion strength (overlap)	Recognized international standard	Min. 20 N/25 mm after 24 hours degassing time
Water vapour transmission	NS_EN 12086	Min. μ 50.000
Dissolve		Material shall not dissolve in the temperature range from -20°C to +70°C .

Insulation jackets shall only be used in internal areas and only on insulation systems without vapour barrier. They shall not be used on valves and flanges with DN 400 mm.