1. Heat Exchanger Stall

2. Condensate Return Hotter boiler feed water temperatures
Minimizes the amount of chemicals required to treat boiler feed water
Eliminates environmental concerns
Minimizes water usage which is critical in some areas
Condensate is a tangible item which can be measured in the form of a savings analysis
Effective return can lower overall costs which can impact profitability
Let’s take a look at a savings analysis...

3. A. Condensate Load A= 2000 lb/hr
B. Annual hours of operation B= 5000 hrs
C. Total Water Cost = (C1+C2)
C1. Untreated water and sewage $/gal
C2. Water treatment chemicals $/gal
C= .005 $/gal
D. Make-up water preheating requirements
D1. Condensate return temperature °F
D2. Make-up water temperature °F
D = (D1-D2) x 1.0 BTU/lb / °F D= BTU/ lb
E. Steam cost E= $/1000 lb
F. Savings in water costs
(A) x 2000 x (B) 5000 x (C) .005
8.34 lb/gal F= 5,995 $/yr
G. Savings for preheating make-up water
*(BTU/lb from direct steam injection)
(A) 2000 x (B) 5000 x (D) 140 x (E) 5.00
*1000 x G= 7,000 $/yr
H. Cost of steam to run Armstrong Pump Trap
3 x (A) 2000 x (B) 5000 x (E) 5.00
*1000 x H= $/yr
I. Total annual savings = (F+G+H)
F. Savings in water costs ,995 $/yr
G. Savings for preheating make-up water ,000 $/yr
H. Cost of steam to run Armstrong Pump Trap $/yr
I= 12,845 $/yr
J. Payback of pump purchase
Payback = $5,063 (cost of pump package)
12,845 J= yrs

4. 25 psig Steam Main
Modulating Control Valve 0 – 25 psig

5. Effects of “Stall” Inadequate condensate drainage Water hammer
Frozen coils
Corrosion due to Carbonic Acid formation
Poor temperature control
Control valve hunting (system cycling)
Reduction of heat transfer capacity

6. Factors Contributing to Stall
Oversized equipment
Conservative fouling factors
Excessive safety factors
Large operating ranges
Back pressure at steam trap discharge
Changes in system parameters

7. 25 psig Steam Main
Modulating Control Valve 0 – 25 psig

8. What is the “Stall” Solution?
Use a bigger steam trap ?
Use a vacuum breaker ?
Implement a safety drain ?
Install a Positive-Pressure system ?
Use an electric pump?

9. Finding “Stall” Modulating Control Where does Stall occur?
Air heating coils
Shell & tube heat exchangers
Plate & frame heat exchangers
Absorption chillers
Kettles
Any type of heat transfer equipment that has
Modulating Control

12. Product Range Single pump capacities from 350 lb/hr to 73,000 lb/hr
Flash recovery vessels
Electric condensate pumps

13. Rescue Cap™ Fits Spirax Sarco PPC/PPF pumps Watson McDaniel Spence
Hoffman PCS
Gestra FPS23
Johnson
Clark Reliance

14. Armstrong Stainless Steel Sump Ejector
Replaces standard electric sump pumps (must have high pressure steam available
For steam pits, tunnels and enclosed spaces where ground or rain water can accumulate and requires pumping
Can be used in any application where the water temperature will not exceed 140°F
Great for locations that run underground steam lines where the drip traps are in tunnels or manholes

15. Armstrong AFT Vertical Flash Vessels
Excellent for providing low velocity flash steam with no water carryover
ASME Sec. VIII U stamped to 150 PSI (other pressures upon request)

16. Closed-loop Low-Boy Receiver Package
Packaged Solutions
Standard Packages
Custom Fabrications
ASME Packages
Low Boy Solutions
Vented Systems
Closed-loop Systems
Process Water Packages
and more…
Closed-loop Low-Boy Receiver Package

17. Common Industry Applications
Jacketed Kettles
Process Air Heating
Tank Heaters
Shell & Tube Exchangers
Process Media (water, oil, food etc.)
Any steam consuming process heat exchanger utilizing…
Modulating Control