Variable Demand DSI Water Heater

The Pick Variable Flow Direct Steam Injection Heater is designed to deliver instantaneous hot water at a precisely controlled temperature over a wide range of water flows.   

 

The Pick Variable Flow Heater can quickly respond to rapid process changes.

 

The Pick Variable Flow Heater is ideal as an instantaneous central utility heating system for multiple use points such as wash-down stations, and plant sanitation.

 

Typical Applications Include:


 

Why Choose a Pick Variable Flow Heater?


 

 

We're the Only One

Pick is the only Direct Steam Injection company to offer a true Instantaneous Variable Flow central system for multiple hose use points and on/off applications

Precise Temperature Control

Accurate temperature control +/- 3°F (1.6°C)

Energy Efficient

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

Wide Operating Range

Widest operating range of any steam injection heater; up to 100:1 turndown with optional dual control valves

How the Pick "Variable Flow" Heater Works:


 

  1. Water (or water-miscible liquid) to be heated enters mixing chamber here.
  2. Set controller to desired set point.
  3. Pump circulates water within the system to prevent stratification of water during low-flow conditions or intermittent use.
  4. Modulating steam control valve is activated by the temperature controller.
  5. Steam and liquid mix instantly and thoroughly within the heater body.
  6. During idle mode (no demand) the relief valve discharges a minimal amount of added condensate as steam is admitted to maintain set point temperature.
  7. Heated liquid outlet

DSI Variable Flow Heater

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).

 

Variable Flow Heaters are normally used on water service and are offered with cast iron housings as standard. Piping, fittings, and valves are iron, bronze, and steel. Alternate alloys/materials are available upon request. Water piping 3" dia. and smaller is threaded. 4" dia. and larger provided with 125# FF companion flanges and fittings.

 

Drawing of 6X7 Variable Flow Direct Steam Injection Heater

 

Drawing of 6X10 thru 6X350 Variable Flow Direct Steam Injection Heater

Variable Flow Heater Technical Specifications


Model No.   6X7 6X10 6X25 6X50 6X75 6X100 6X150 6X200 6X350
Steam Capacity
Lb/hr
Kg/hr
700
320
1,250
565
2,500
1,130
5,000
2,265
7,500
3,400
10,00
4,535
15,00
6,800
20,000
9,070
35,000
15,875
Liquid Pipe Size Range (inches) 
Threaded
Flanged Class 125
0.75 - 1.5
--
1 - 2
--
1.25 - 2.5
--
1.5 - 3
--
2 - 3
4
2.5 - 3
4
3
4 - 6
--
4 - 8
--
4 - 8
Approximate Dimensions (inches)
A
B
44
44
48
48
52
52
58
56
66
66
76
70
90
85
100
94
112
104
Shipping Weight (lbs)   320 375 440 650 900 1,100 2,200 2,500 3,000

 

 

Water Pipe Selection Chart


Choose best pipe size based on water flow rate in GPM

Max. GPM 8 15 30 45 90 140 230 500 1,000 1,800 3,000
Pipe Size (inches) 0.75 1 1.25 1.5 2 2.5 3 4 6 8 10

 

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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