1. The theme content and scope of application

 

China's industry standard JB/T4723-92 rules for carbon steel and stainless acid-resistant steel not detachable spiral plate change

 

Heat exchanger type nominal pressure, nominal diameter, calculation of basic parameters such as heat transfer area. This standard applies to the nominal pressure is greater than 1.6 mpa, nominal diameter is not more than 1600 mm, nominal heat exchange area of not more than 120 m2 not detachable spiral plate heat exchanger. But with the progress of technology, large-scale not detachable spiral plate heat exchanger has been widely used in national economy, detachable spiral plate heat exchanger at the same time also has the very big development, it exposes certain limitation standard. This appendix only provide some useful reference.

 

2. The symbols that

 

PN, nominal pressure, mpa

 

DN, nominal diameter, mm

 

FN - nominal heat exchange area, the m2;

 

F - calculate heat transfer area, the m2;

 

B - channel spacing, mm;

 

The delta - thickness, mm

 

H - plate width, mm

 

V - flow rate, rate of 1 m/h in the m3 / h

 

Lt - screw channel length, m;

 

F - screw channel area, m2;

 

Dn - to take over the nominal diameter, mm;

 

D - center pipe diameter, mm

 

3. The type of

 

Not detachable spiral plate heat exchanger of structured see chapter 3 1.3.1

 

4. The basic parameters

 

4.1 nominal pressure

 

Nominal pressure refers to the channel can withstand the maximum working pressure.

 

PN: 0.6, 1.0, 1.6 MPA

 

4.2 nominal diameter

 

: carbon steel, 500600700800900100, 0120, 0140, 0160 mm;

 

Acid-proof stainless steel: 300400500600700800900100 0120 0140 300400500600700800900100.

 

4.3 nominal heat exchange area

 

Carbon steel: 6,8,10,15,20,25,30,40,50,60,80,100,1200 m2;

 

Acid-proof stainless steel: 1,2,4,6,8,10,15,20,25,30,40,50,60,80,100 m2.

 

5. Main parameters not detachable spiral plate heat exchanger