Thermal Insulation

To guarantee a correct process cycle, the condition of the media within the pipes must remain within the set limitations (e.g. temperature, viscosity, pressure, etc.). In addition to the correct isometric construction and fastening of the piping, the piping insulation also has an important function. It must ensure that the heat losses are effectively reduced and that the installation continues to operate economically and functionally on a permanent basis. This is the only way to guarantee the maximum efficiency of the process cycle throughout the design service life without losses as a result of faults.

Principially, a thermal insulation structure for piping consists of an appropriate insulating material, usually covered by sheet metal cladding. This protects the pipe and the insulation from external influences such as weather or mechanical loads.

Spacers are also essential with insulation material such as wired mats , which do not offer sufficient resistance to pressure to hold the weight of the cladding and other external loads. These spacers transfer the loads from the cladding directly onto the pipe to be insulated. in case of vertical piping, support structures are fitted to take on the loads of the insulation and the cladding. In general, support structures and spacers form thermal bridges.

HVAC Insulation - Pipes

For the HVAC (Heat Ventilation Air Condition) applications onboard a ship it is most common to use Pipe Sections or Marine Lamella Mats to insulate the pipes. The aim is to prevent heat loss in heating systems and warm water supply. It is necessary to supply heating and warm water also in the last cabin away from the source.

The benefits of correct thermal insulation for piping include:

  • Reduction of heat losses
  • Cost savings
  • Reduction of CO2 emissions
  • Frost protection
  • Process control: ensuring the stability of the process temperature
  • Noise reduction
  • Condensation prevention
  • (Personal) Protection against high temperatures
Airducts

Today many requirements are made on air ducts. Most important is that the comfort on board the vessels or platforms living quarters is considered and that no compromises are made to the demands on fire safety. In connection with ventilation of cabins and other rooms it must furthermore be ensured that no condensation is formed and that the required temperature is maintained all the time. This is obtained by using one of the ROCKWOOL SeaRox products in the correct thickness.

Product

Insulation with SeaRox Lamella Mats

SeaRox Lamella Mats consists of stone wool lamellas placed edgewise, the mayority of the fibres being perpendicular to the facing. The SeaRox Lamella Mats can be used up to max. service temperatures of 250 ºC. Facing max 80 ºC.

Due to the allignment of the ROCKWOOL fibres in SeaRox Lamella Mats, they have a right resistance to compression. They are suitable for applications where there is a requirement for:

  • Compression resistance
  • Possible mechanical impact
  • Operational vibration loads

The surface finish on the SeaRox Lamella Mats, should be taped at all joints.
The mats are secured with steel banding.

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Insulation with SeaRox Slabs

Tanks and vessels can be insulated with ROCKWOOL SeaRox Slabs min. density 45 kg/m3 if there are no requirements for high operational temperatures. The products can be used to max. service temperatures of 250 °C.

The Slabs are installed over metal strap ties. These ties are bent over the edge of the outer layer of Slabs to retain them against the tank wall.
Where the insulation extends more than 4 m in height, intermediate support profiles must be installed onto the tank wall. Special "S"-profiles can be used to ensure vertically staggered joints, while supporting the Slabs above and retaining the Slabs below.
When more than one layer of Slabs is required, all joints must be staggered and tightly butted together to avoid thermal bridges.
The SeaRox Slabs must be covered with a flat or profiled external cladding to protect them from the weather and mechanical damage.

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Cladding

Suitable cladding should be applied to protect the insulation from weather influences, mechanical loads and (potentially corrosive) pollution. Selecting the appropriate cladding depens on various factors, such as working loads, wind loads, ambient temperatures and conditions.

When selecting the appropriate cladding, take the following points into account:

  • As a general rule, galvanised steel more than aluminium is used indoors due to its mechanical strength, fire resistance and low surface temperature (in comparison to an aluminium cladding).
  • In corrosive environments like outdoors on deck where salty water leads to corrision, aluminised steel, stainless steel or glass reinforced polyester (e.g. Rocktight) is used as cladding. Stainless steel is recommended for use in environments with a fire risk.
  • The surface temperature of the cladding is influenced by the material type. The following applies as a general rule: the shinier the surface, the higher the surface temperature.
  • To exclude the risk of galvanic corrosion, only use combinations of metals that do not tend to corrode due to their electrochemical potentials.
  • For acoustic insulation, a noise absorbent material (Lead layer, polyethyten foil) is installed on the insulation or inside the cladding. To reduce the risk of fire, limit the surface temperatures of the cladding to the maximum operating temperature of the noise absorbent material.
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