Constant Demand DSI Liquid Heater

Pick Constant Flow Heater

The Pick Constant Flow Heater is used wherever a relatively constant flow of heated liquid at a precisely controlled temperature is required.

 

It is ideal when the flow rate is fixed or varies over a narrow span (3:1), or where variations in flow are gradual and rapid on/off cycling does not occur.

 

Typical Applications Include:


 

Why Choose a Pick Constant Flow Heater?


 

 

No Steam Hammer

Eliminates harmful vibration and steam hammer which can lead to product and equipment damage.

Exceptional Temperature Control

Precise, accurate temperature control +/- 1°C

Energy Efficient

100% heat transfer - cuts fuel costs as much as 28% compared with indirect heat exchangers

Low Liquid Pressure Drop

Pressure drop does not exceed 2 PSI (0.14 BAR) under design flow rates 

How the Pick "Constant Flow" Heater Works:


 

  1. Water (or water-miscible liquid) enters mixing chamber here.
  2. Set controller to desired outlet temperature.
  3. Modulating steam control valve is activated by the temperature controller.
  4. Steam and liquid mix instantly and thoroughly within the heater body.
  5. Heated liquid outlet.

Sizing Formula:


 

Steam demand

(lb/hr)= 0.43 x flow(GPM) x ∆ T (ºF)

or

(kg/hr) = 0.092 x flow(LPM) x ∆ T (ºC)

 

Example: 200 GPM x 50ºF temperature rise x 0.43 = 4,300 lb/hr of steam. You would require a 6X50-3 which has a maximum rated steam capacity of 5,000 lb/hr, and a maximum water flow rate of 230 GPM with threaded connections (500 GPM with welded flanged connections).

 

Drawing of 6X7-3 Constant Flow Direct Steam Injection Heater

 

Drawing of 6X10-3 thru 6X500-3 Constant Flow Direct Steam Injection Heater

Constant Flow Heater Technical Specifications


Model No.  

6X7-3

6X10-3

6X25-3

6X50-3

6X75-3

6X100-3

6X150-3

6X200-3

6X350-3

6X500-3

Steam Capacity
Lb/hr
Kg/hr
700
320
1,250
565
2,500
1,130
5,000
2,260
7,500
3,390
10,000
4,250
15,000
6,780
20,000
9,040
35,000
15,820
50,000
22,600

Liquid Pipe Size Range (inches)

Threaded
Flanged
0.5 - 1.5
0.75 - 2
1 - 2
1 - 3
1.25-2.5
1.5-4
1.5 - 3
2 - 4
2 - 4
2 - 6
2.5 - 4
2.5 - 6
3
3 - 8
--
4 - 10
--
4 - 10
--
6 - 12
Approximate Dimensions (inches)
A
B
44
32
48
38
54
44
60
50
66
65
74
68
80
82
110
94
120
105
130
122
Shipping Weight (lbs)   275 300 350 440 600 825 950 1,800 2,400 3,000

 

 

Liquid Pipe Selection Table


Choose best pipe size based on water flow rate in GPM

Pipe Size 1 1 - 0.25 1 - 0.5 2 2 - 0.5 3 4 6 8 10
Max. GPM 15 30 45 90 140 230 500 1000 1800 3000

Heaters are readily available with cast iron, carbon steel, or 316SS.  Other alloys/materials available upon request. Water and steam piping is available in threaded or flanged construction.

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