©2009 Armstrong International, Inc.armstronginternational.com

COIL PIPING BEST PRACTICESCOIL PIPING BEST PRACTICES

Jim Smith – CEM

Product Mgr.AHTG

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

2“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

GENERAL GUIDELINES

1) TRAP EACH COIL SEPARATELY. NEVER MASTER TRAP.

2) AVOID MIXING HP AND LP STEAM COILS IN COMMON RETURN HEADER. DRAIN LP COILS TO RECEIVER and PUMP RETURN TO HP RETURN WITH PUMP TRAP.

3) AVOID OVERSIZING STEAM CONTROL VALVES. VERIFY RANGE OF GENERAL SERVICE CONDITIONS AND STEAM/CONDENSATE LOADS. OVERSIZING CONTROL VALVES LEADS TO “HUNTING”, POOR RESPONSE AND POOR CONTROLABILITY. USE SPLIT RANGE OR 1/3-2/3 TYPE CONTROL VALVE OPTIONS FOR WIDELY VARYING LOAD CONDITIONS.

4) DO NOT REDUCE CONDENSATE OUTLET PIPING AND AVOID ELBOWS. USE CROSSES/TEES TO HELP NON-CONDENSABLES TO KEEP MOVING.

5) INSTALL AIR VENTS AND VACUUM BREAKERS WHENEVER POSSIBLE WITH FULL PORT ISOLATION VALVES TO ALLOW FOR SERVICING WITHOUT SHUTTING DOWN COIL OPERATION.

6) EVALUATE RETURN HEADS AND BACK PRESSURES TO ALLOW FOR GRAVITY DRAINING OF COILS VS RETURNS AGAINST BACK PRESSURES. EVALUATE WATER HAMMER POTENTIAL.

7) INSURE SHUTDOWNS OR RETURN AGAINST HEADS/BACK PRESSURES. UTILIZE PUMP TRAPS, SAFETY DRAINS, GRAVITY DRAIN OPTIONS AND/OR POSI-PRESSURE CONTROLLERS.

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

3“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

Air Vent

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

4“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

NOTES:

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

5“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

Air Vent

Some Valving/Fittings Not Shown for Clarity!

MAINTAIN FULL CONDENSATE OUTLET LINE SIZE TO TRAP REDUCING “T”!

X

SUGGEST FULL PORT ISOLATION VALVE HERE! (Normally OPEN)Maintain Full Condensate Outlet Line Size to Reducer!

REFER TO ARMSTRONG PUMP TRAP GUIDELINES FOR CLOSED LOOP OPTIONS!

Secondary VB – Shutdown Only!

Primary VB

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

6“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

STEAM TRAP SELECTIONGeneral Guidelines – DO NOT MASTER TRAP!

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

7“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

Pump Trap Option draining Single Air Preheater Coil.- Still No Air Vents off Coil and Reducers in-line before trap take-off

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

8“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

Armstrong : Posi-Pressure Control System“ The SMART Vacuum Breaker”

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

9“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

SINGLE COIL CLOSED LOOP with ARMSTRONG ‘DOUBLE DUTY’ PUMP TRAP

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

10“Expect many enjoyable experiences!”

David M. Armstrong

®

GENERAL PIPING – STEAM COILSGENERAL PIPING – STEAM COILS

Full System Example

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

11“Expect many enjoyable experiences!”

David M. Armstrong

®

Armstrong’s PromiseArmstrong’s Promise

We provide intelligent system solutions that improve utility performance, lower energy consumption, and

reduce environmental emissions . . . while providing an “enjoyable experience!”

Intelligent System Solutions S T E A M • A I R • H O T W A T E R

11“Expect many enjoyable experiences!”

David M. Armstrong

®