Every business in the preparation of their products or product specification when the sample selection, has its own unique way. Therefore, users in the selection, selection of samples or should carefully read the instructions, on the basis of understanding coupled with a choice, otherwise the selected model may not reach the requirements, the proposed requirements are too high or indirectly raises the cost of the product. 1. The design pressure, design temperature, nominal Spiral Wrapping tube heat exchangers, shell pressure can be any combination, given the pressure tube type and shell refers to the nominal pressure, determine the maximum allowable working in Pressure should be 6-13 lookup table, or have a maximum allowable working pressure, draw the design temperature of the selected nominal according to Table 6-13. The design pressure is usually not less than the maximum allowable working pressure. For example: Model WBH600-2.5 / 1.6-39 ~ QX, on behalf of the tube, shell PN are 2.5MPa and 1.6MPa, if its tube design temperature of 150 ℃, shell design temperature of 250 ℃, the tube Cheng maximum allowable working pressure of 2.45MPa, shell maximum allowable working pressure 2.23MPa, this time desirable tube design pressure 2.5MPa, shell design pressure of 2.4MPa. 2. takeover flange Currently, standard pipe flanges take over many, such as JB standard mechanical part, the national standard GB, Ministry of Chemical Industry construction standards HGJ series. Therefore, the choice should be the standard used in series with the user consistent pipeline, including pressure levels, to take over the nominal diameter, the use of temperature. Generally, water - water heat exchanger, using the corresponding nominal flange to take over where the tube or shell nominal pressure rating; for steam - water heat exchanger, using the ratio of nominal flange take over where the tube or shell nominal pressure rating high level of pressure rating; heat of flammable, explosive, corrosive media, the flange nominal high than to take over where the tube or shell secondary nominal rating pressure rating. Spiral Pipe Heat Exchanger is a comprehensive selection process, not only the selected Spiral Wrapping heat exchanger to achieve the required heat transfer area, but also consider the pressure drop, flow rate, installation location, as long as the full consideration before they can choose a suitable spiral winding pipe heat exchanger. This article Source: http: //www.zbhanzun.com