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Variable Demand Direct Steam Injection Water Heater

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Variable Flow Steam Injection Heater

Pick Variable Flow System

 

Pick Large Capacity Variable Flow Heater in Carbon Steel

VF Steam Injection System

 

Pick Variable Flow Heater with all 316 SS Wetted Parts

VF Steam Injection System

Pick Model 6X50 Variable Flow Heater

VF Steam Injection System

Pick Carbon Steel Flanged Variable Flow Heater

VF Steam Injection System

Pick Variable Flow Heater with all 316 SS Wetted Parts on 304 SS Frame

VF Steam Injection System

Pick Large Capacity Variable Flow Heater with Dual Steam Control Valves

VF Steam Injection System

Pick Model 6X10 Variable Flow Heater on Wall Mount Frame

VF Steam Injection System

Variable Flow Steam Injection Heater

Pick Variable Flow System

 

Pick Large Capacity Variable Flow Heater in Carbon Steel

VF Steam Injection System

 

Pick Variable Flow Heater with all 316 SS Wetted Parts

VF Steam Injection System

Pick Model 6X50 Variable Flow Heater

VF Steam Injection System

Pick Carbon Steel Flanged Variable Flow Heater

VF Steam Injection System

Pick Variable Flow Heater with all 316 SS Wetted Parts on 304 SS Frame

VF Steam Injection System

Pick Large Capacity Variable Flow Heater with Dual Steam Control Valves

VF Steam Injection System

Pick Model 6X10 Variable Flow Heater on Wall Mount Frame

VF Steam Injection System

What is a "Variable Flow" Steam Injection Heater?

The Pick Variable Flow Steam Injector mixes medium-to-high pressure steam with cold water and delivers instantaneous hot water at a precisely controlled temperature over a wide range of water flows. 

 

It is used to accommodate wide variations in demand and frequent start-stop applications and is ideally suited as a central heating system for multiple use points such as hose wash-down stations or plant sanitation.  Standard systems can handle 12:1 water flow turndown or designed with dual control valves for up to 100:1 water flow turndown.
 

The Variable Flow system is ideal for replacing inefficient heat exchanges, storage tanks, steam spargers, and problematic individual steam/water mixing stations.

 

Learn about our Constant Demand Direct Steam Injection Water Heater

Application Data Forms & Brochure Downloads

Need a quote for a Pick Steam Injection Heater?  Save time by submitting an application data sheet.  Just looking for additional information on our products?  Download our product specific brochures. 

Submit Application Data Sheet

Download Pick Variable Flow Brochure

Download Pick Steam Injection Heater Brochure

Need a Replacement Part or Manual?

Request Replacement Parts

Contact us to order the parts you need to keep your Pick Heater up and running.

Replacement Parts Request

 

Request a Manual

Contact us to request a copy of the Service and Installation Manual for your Pick Heater.  

Manual Request

Read a Related Blog Post or Article

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Getting Into Hot Water–Indirectly

 

 

Typical Applications Include:

 

Have a Question or Need More Information?

 

We’re committed to providing the best customer support before and after the sale with a team of factory sales engineers that are recognized experts in the industry. They’re ready to put that expertise to work for you.

 

Contact Us

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

Say “Yes” to Pick Heaters

 
Pick Heaters
Mixing Tees
Automatic Temperature Control Yes No
No Steam with Loss of Water Yes Yes
Responds Automatically to Varying Pressure Yes No
100% Heat Transfer Efficient Yes Yes
Can Be Used On Water Pressure Less than 50 PSI Yes Varies By Manufacturer
Eliminates Need for Operator Adjustments Yes No

 

 

 

Variable Flow DSI Heater for Hose Station Service

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 by-pass relief valve discharges a minimal amount of added condensate as steam is admitted to maintain set point temperature.
  7. Heated liquid exits through the outlet.

DSI Variable Flow 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).

 

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.

Pick DSI Variable Demand Heater

Drawing of 6X7 Variable Flow Direct Steam Injection Heater

Pick DSI Variable Demand 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
10,000
4,535
15,000
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 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 Variable Demand System

DSI Variable Demand Wall Mount System

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