Advantages of Fabric Composite Air Duct in Medical Pallet Warehouse

For the new modern medical logistics warehouse, the building space is large, the air conditioning covers a wide area, and the roof bearing capacity is small. The point air supply mode of traditional iron sheet air duct system will lead to uneven air volume in the process of air supply, and can not accurately control the humidity in each area of the warehouse; moreover, the weight of the traditional air duct is a great burden for the modern medical logistics warehouse.

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For the reconstruction project, due to the long service life of most air ducts, condensation water, dust accumulation and bacteria breeding often occur in the ventilation ducts, which greatly affect the quality of drug storage.

With our joint efforts, the fabric composite air duct has been used in the newly-built or reconstructed medical warehouses. The accurate air supply and large coverage area realize a good air distribution in the warehouse. At the same time, the fabric duct installation is convenient. The air filters through the duct wall with no condensation water.

The application advantages of fabric composite air duct in medical pallet warehouse:

1. There is no dead corner and stagnant area of air supply, which can realize the uniform air supply and keep the same temperature.

2. The air filters through the surface of the infiltration mode fabric composite air duct slowly. Due to the effect of the wind pressure, the hot and humid air outside the duct can not contact the duct wall, so the condensation will not occur on the surface of the air duct.

3. The weight of the fabric composite air duct is 1/40 of that of traditional air duct, which can greatly reduce the bearing capacity of pallet warehouse structure. When finished products arrive at the site, they can be hung using the matched steel wire or slide rail, which is simple and fast. The installation time is 1/10 of that of the traditional air duct or even shorter, which greatly shortens the construction period and saves manpower.

4. The layout is simple, and the circle shape provides more visual aesthetic feeling and affinity. There are various colors for your choice, which can keep in harmony with the indoor style.

Fabric Expansion Joints utilize a composite fabric material as the flexible component of the joint. They are primarily used in low-pressure ducting systems to accommodate misalignment, vibration, and thermal expansion. These joints can be engineered with composite fabric that includes integral insulating layers or separate insulation pillows, enabling them to withstand temperatures exceeding ˚F.

Fabric Expansion Joints are effective in addressing thermal expansion in ducting and misalignment without the spring forces typically found in metal expansion joints. They are also capable of absorbing significant lateral movements or misalignments. Depending on the specific application and service requirements, additional features such as flow liners, insulation blankets, and accumulation barriers may be incorporated into the fabric expansion joint.

UIP offers a complete line of non-metallic “fabric” duct expansion joints.  Options include belt type, integrally flanged fully molded type, duct expansion joints for lower pressure gaseous service, as well as high temperature flue gas.

Fabric Expansion Joints for High Temperature Flue Ducts

Fabric Expansion Joints are non-metallic, highly flexible connections that provide stress relief for piping and ducting systems by absorbing thermal growth and shock, isolating mechanical vibration, and allowing for misalignment.  They provide significant flexibility when installed in large ducting and piping systems.  Fabric joints can be manufactured from a variety of special woven, coated or laminated fabric materials.  They offer extreme flexibility and can absorb movements simultaneously from several directions. Fabric joints are easily customized and require little space. They are also easy to transport and install.  UIP fabric expansion joints offer excellent operational performance and reliability.

UIP Flue duct expansion joints are custom-engineered to handle low pressure (±3 psig) applications.  Standard profiles include U-type, flat belt type, square, rectangular, and round.  These expansion joints are precision-engineered and specialized for your application, available in eight standard profiles from -110°F up to 2,000°F.

Service Features of Fabric Expansion Joints

• Stress relief for piping and ducting systems
• Excellent corrosion and chemical resistance
• Absorbs thermal growth and shock
• Negligible spring rates and loads
• Easily repairable and installable
• High cycle life
• Vibration dampening and sound attenuation
• More movement in shorter face-to-face
• Less force to flex than metal expansion joints
• Temperature capability range -110°F up to 2,000°F
• Variety of flexible belt materials available:
  • Single-layer and composite belts
  • Elastomers have excellent abrasion resistance
  • Custom designed for each specific application

Design Considerations

• Media: Internal and External Environment
• Temperature: Constant operating and maximum excursion
• Pressure: Normal positive or negative
• Movements: Axial and lateral, simultaneously or independently
• Installation: Existing equipment and duct flanges
• Assembly: Factory-assembled or field-spliced

Baffles

Baffles are usually not necessary with elastomeric expansion joints due to the tube resistance to most abrasive particular matter. However, baffles must be used with fabric composite joints to protect the inner surface from particulates in the gas stream. UIP International, Inc. can supply baffles fabricated from carbon steel, stainless steel, or other materials as required.

Retaining Rings

Standard construction calls for 2″ wide, 3/8″ thick bars with slotted holes for easy installation. Retaining rings can be made from carbon or stainless steel.

Availability

• U-type
• Belt type
• Square
• Rectangular or round
• No size restriction
• Choice of FF dimension, depending on movements
• Associated Metal Work: Backup bars, frames, flanges and baffles

Our products incorporate the latest recommendations of the Expansion Joint Manufacturers Association.

A. Gas Seal Membrane

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The gas seal membrane is designed to withstand system pressure and provide resistance to chemical attack from the interior and the exterior. The gas seal needs to have the flexibility to absorb thermal movements. Depending on system temperature, it may require additional thermal protection.

B. Insulating Layers

The insulating layers provide a thermal barrier to ensure that the inside surface temperature of the gas seal membrane does not exceed its maximum service temperature. The insulating layer can also reduce condensation that would be caused by the gas stream if it were to come in contact with the cool surface of an uninsulated gas seal membrane.

C. Insulating Retainer Layer

This layer keeps the insulating layers in place and maintains thermal integrity. The retaining layer must be able to withstand gas stream temperatures and must be chemically compatible with system media.

D. Back up Bars

Back up bars, positioned at the belt frame attachment, use clamping pressure to create the fabric-to-frame seal and restrain the fabric when it is subjected to the system pressure. The thickness and width of the back up bars should be sufficient to perform this function with the bolt spacing being used. The edges of the back up bars will have a radius to preclude cutting of the fabric.

E. Metal Liner or Baffle or Pillow

A liner is designed to protect the gas seal membrane and insulating layers of the flexible element from abrasive particles which may be present in the gas stream. A liner is also used to reduce flutter of the fabric element caused by turbulence, to help control the accumulation of dust or ash in the expansion joint cavity, and to reduce the temperature of the flexible element.

F. Expansion Joint Frame

An accumulation bag is intended to deter fly ash from building up in the expansion joint cavity. It is typically used, in conjunction with a liner, in duct runs from boilers to air clean-up equipment such as precipitators, scrubbers and bag houses, or whenever high amounts of dust or ash are present in the gas. A fly ash barrier must be capable of retaining its strength and flexibility while being exposed to maximum system temperatures and media.

G. Fabric Expansion Joint Frame

The expansion joint frame design controls the effectiveness of the connection of the flexible element to the ductwork. In some designs they can be attached directly to the duct work and thus eliminate the necessity for an adjoining duct flange. Frames can be designed with a “landing bar” duct attachment which allows some installation misalignment without affecting the flexible element. The frames establish the stand off height of the fabric, which is necessary to achieve thermal integrity during all movement conditions. The edges of the flanges in contact with the gas seal membrane should also have a radius to prevent damage.

H. Gasket

Single-ply fluoroplastic and fluoro-elastoplastic belt designs such as Ultrachem materials require flexible chemically inert gaskets. Cuff tape can also be applied in this area to protect the belt from conducted frame heat and movement abrasion.

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