Tube bundle header type

 A tube bundle is an assembly of tubes, headers, side frames, and tube supports as shown in figure below. Usually the tube surface exposed to the passage of air has extended surface in the form of fins to compensate for the low heat transfer rate of air at atmospheric pressure and at a low enough velocity for reasonable fan power consumption.

 The box header consists of tube sheet, top, bottom, and end plates, and a cover plate that may be welded or bolted on. If the cover is welded on, holes must be drilled and threaded opposite each tube for maintenance of the tubes. A plug is screwed into each hole, and the cover is called the plug sheet. Bolted removable cover plates are used for improved access to headers in severe fouling services. Partitions are welded in the headers to establish the tube-side flow pattern, which generates suitable velocities in as near countercurrent flow as possible for maximum mean temperature difference. Partitions and stiffeners (partitions with flow openings) also act as structural stays. Horizontally split headers may be required to accommodate differential tube expansion in services having high fluid temperature differences per pass. The figure below illustrates common head types.

Plug type
This is the best suited for a high pressure application up to 3,300 psig (230kg/cm2G). the individual tube is accessible for cleaning and tube plugging

(Removable) Cover plate type
This is best suited for the fluid of hghly foulding tendency because of easy access to all tubes. This is applicable for a moderately high pressure up to 500 psig (35kg/cm2G)

Bonnet type
This type is suited for a high-vaccum operation. The bonnet type eliminates welding joints of the box type.

Manifold type
This type is a vacuum steam condensers of a power plant application. The large manifold ensures the low pressure drop so that the flow rates become equal to every tube.

            
Cooling Water Module for GE Power System

This special 'Cooling Water Module' is a system for the water cooling and pumping unit for the circulating cooling water system of a GE Frame gas turbine w/H2 cooled Generator. All components of the Cooling Water Module have been mounted, piped and wired in our factory. The Design Standards has been incorporated with ASME, AWS, ASTM, AISC, NEMA, OSHA, ICBO, TEMA, SSPC, NFPA.

[Home][about KHE][Product][Facilities][Engineering][Quality][Experience][Contacts][Agent]
 Copyright(c) 2002 Korea Heat Exchanger Ind. Co., Ltd. All rights reserved.
khe01@khei.com