Heat exchange assembly for ultra-pure water
US4461347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1981 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jan 27, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S138/03
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A heat exchange assembly for raising a process fluid, such as ultra-pure, de-ionized water, to an elevated temperature without adversely affecting the quality thereof includes coaxially-arranged inner and outer pipes, the annular space therebetween defining a flow passage for the fluid to be heated. The inner pipe is formed of high-strength metal of good thermal conductivity and encloses a heat source, such as steam, circulating heated fluid or an electric heater. The inner pipe is ensheathed by an extruded heat-shrinkable plastic tube of non-reactive material, such as PTFE or polypropylene not exceeding 7 mils in thickness, which is shrunk-fit thereon to form one wall of the flow passage. The opposing wall of the passage is formed by the interior surface of the outer pipe which is also constituted by non-reactive plastic material such as PTFE or polypropylene. Terminations comprising all-plastic unions are provided at the ends of the inner and outer pipes to couple the passageway to inlet and outlet fitting for the process fluid. The outer pipe may be reinforced by a braided outer sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.