Cryogenic Supports
Dannenbaum LLC is a supplier of Cryogenic Pipe Supports in three main categories:
1) High-Density Polyurethane Foam (HD PUF)
2) Glass Reinforced Polyester Composite
3) Hardwood. Densified Wood Blocks
The selection of one of the above forms of Pipe Support depends on many factors: load-carrying capacity, ease of installation, piping contractor’s requirements, etc.
Therefore, this section includes specific details of all three types of Cryogenic Support.
However, due to the numerous individual requirements in the marketplace, we welcome all inquiries in connection with the support of Cryogenic piping, and our experienced engineers can offer guidance as to the benefits of all three systems.
Cryogenic Insulated Pipe Supports
Dannenbaum LLC is a supplier of Cold Insulated Pipe Supports consisting of a steel cradle containing High-Density Polyurethane Foam inserts.
“Thermafoam” is specifically formulated and molded-in single or multi-layer 180° segments with high-density skins. The design make-up of the insulated pipe support can be categorized as follows:-
i) “HD PUF monolithically molded, or cut from bun stock, segments either single or multilayer.
ii) Aluminum foil vapor barrier to prevent ingress of moisture.
iii) Aluminized metal thin gauge protective jacket to prevent damage to the vapor barrier.
iv) Mechanically strong carbon steel support cradle, which contains the insulation element and allows pipe loading to be transferred safely to supporting structures.
The two essential design parameters for Cryogenic Pipe Supports are compressive strength and thermal conductivity.
Polyurethane Foam has superior insulation properties to prevent heat loss and maintain cold process pipelines to avoid freezing.
Polyurethane Foam can be efficient over an extensive range of temperatures, typically -196ºC to +120ºC.
The density of the foam, which determines the compressive strength, is generally between 160 kg/m3 and 320 kg/m3.
With these load-bearing properties, it is evident why PUF is such a suitable insulation material for Cryogenic Support Applications.
Polyurethane Foam is made by mixing two liquids and a blowing agent.
We use the latest molding machine technology to utilize CFC free-blowing agents to produce monolithically molded components with a shallow isocyanate index.
Finally, steps are machined to ensure alignment with the parent pipe insulation system.
With the steelwork manufacture and the PUF insulation undertaken side by side in our works, we provide complete control of production progress.
Cryogenic Insulated Pipe Supports
Our Engineering Department has experienced designers who can give practical advice and assistance in the design of Cryogenic Pipe Supports.
Upon receipt of all relevant information, our engineers can calculate and design the cryogenic supports needed for each project, from simple shoes to complex anchors.
Fully dimensioned detail drawings for each support are produced for customer approval before manufacture commences.
Molding tools are made on a project-specific basis.
Also, they can be made in pipe sizes ranging up to 900NB with insulation thickness of up to 250mm.
Independent testing is done to determine the thermal conductivity, density, and compressive strength of the HD PUF materials. Our testing, calculation, and design criteria are all based on:
i) Shell DEP No 30.46.00.31 – Gen document
ii) ASTM D-1621: Compressive strengths of HD PUF
iii) ASTM C-177: Thermal conductivity testing Our Quality Systems are regularly audited by third parties and have been fully endorsed by achieving certification following BS EN ISO 9001.
Resin Bonded Insulation Blocks
We can offer cryogenic supports manufactured from a Resin Based compound capable of withstanding greater loads than polyurethane
foam.
This material has a proven track record in Oil, Gas, and Process Industries and offers an excellent combination of Mechanical, Thermal, and Fire Resistant properties.
Compressive strength of 140 mph is typical for these supports, together with a standard working temperature range of between -190˚C to +160˚C.
As this material will accept inserts, individual blocks can be machined, bored, or tapped, and it is particularly suited for use in supports that incorporate steel sections.
Hardwood Blocks/Densified Wood
Close-grained hardwood such as oak, iroko, or obeche can be used as a load-bearing insulator on low-temperature services.
The woods are kiln dried to ensure an acceptable moisture content and then machined in segments according to pipe diameters.
An alternative to hardwood blocks is a unique material manufactured from selected beech veneers, impregnated under vacuum with thermosetting synthetic resin, and then densified under heat and pressure.
The main benefit of both the above products is their high compressive strengths coupled with their apparent machining versatility.
There are numerous applications for both woodblock designs, and inquiries are welcome.
