Constant Demand Direct Steam Injection Liquid Heater

Pick Constant Flow Heater

What is a "Constant Flow" Steam Injection Heater?

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

 

The Constant Flow Steam Injector mixes medium-to-high pressure steam with cold water and delivers instant hot water.  It is ideal when the water flow is fixed or varies over a narrow span (3:1).  


The Pick Heater is delivered as a complete, compact system and can be easily customized with additional controls, valves, and instrumentation to meet your plant specifications.  Save space, energy and maintenance costs using a Pick Constant Flow Heating System. 

 

For water flow turndown beyond 3:1 or rapid start-stop cycling applications, please refer to our Variable Flow design.

 

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 exits through the outlet.

Pick Constant Demand Steam Injection Heater

The Pick Heater is an engineered product and heater selection is primarily based on Steam Demand.


For preliminary heater selection use the following Sizing Formula. Next match the liquid flow rate to the appropriate pipe size. The selection should be verified by your local Pick Heater Rep or a Factory Sales Engineer.

 

Please contact us with questions.

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).

Pick DSI Constant Demand Heater

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

Pick DSI Constant Demand 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 manufactured in Cast Iron, Carbon Steel, or 316SS.  Other alloys/materials available upon request. Liquid and steam piping is available in NPT Threaded or ANSI/DN Flanged construction.

Custom Systems


 

Pick Pre-Packaged Hot Water sets are custom designed to meet process industry needs effectively and efficiently.
  • Pre-engineered skids, wall mounts or floor mounts available to meet your specific requirements.
  • Compact design can fit most customer space constraints.
  • Fully assembled and ready for operation (includes circulation pump, complete valving, controls and instrumentation in a skid-mounted package).
  • Pilot Scale and Production Systems.

DSI Constant Demand System

DSI Constant Demand System

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