PB Heat 211A Multiple Boiler Installations, Boiler Header End Risers, Equalizers, Model Size

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PIPE THE BOILER

Figure 5.3: Supply and Return Piping – Counterflow Gravity Systems

2.On pumped return systems, install a boiler cock after the pump to allow throttling of the pump discharge. The pressure after the boiler cock should be no more than 5 psig (35 kPa) above the boiler operating pressure. Pumping the water into the boiler too fast will cause collapse of the water level and level control problems.

3.Size the equalizer per Table 5.1.

4.Pipe the Hartford loop tee so the inside top of the close nipple is 2 to 4 inches (51 to 102 mm) below the boiler water line.

5.If the pump discharge is looped overhead, above the boiler water line, install spring-loaded check valves at both the pump discharge and the connection to the boiler return.

Figure 5.4: Left Hand Piping Arrangement – Typical

D.MULTIPLE BOILER INSTALLATIONS

1.Figure 5.5 shows typical piping for multiple boiler Gravity Return systems. Figure 5.6 shows typical piping for multiple boiler Pumped Return systems.

2.Provide separate feed lines for multiple boiler pumped return systems. Use either separate feed pumps or solenoid valves to isolate feeding of the boilers. This is needed to provide reliable level control and avoid nuisance performance problems.

3.Condensate return units are not effective for multiple boiler installations since they do not respond to the needs of the boilers. Always use Boiler feed units.

a.Install a Float and Thermostatic trap at the boiler water level on each of the multiple boilers on a pumped return system. This prevents flooding of idle boilers due to condensation of steam.

Table 5.1: Header, Risers & Equalizer Sizing

Boiler

Header

End Risers

Interm. Risers

Equalizers

Model

Size

No.

Size

No.

Size

No.

Size

211A-04

4"

1

4"

-

-

1

2-1/2"

211A-05

5"

1

5"

-

-

1

2-1/2"

211A-06

5"

1

5"

-

-

1

2-1/2"

211A-07

5"

1

5"

-

-

1

2-1/2"

211A-08

6"

2

5"

-

-

1

2-1/2"

211A-09

6"

2

5"

-

-

1

2-1/2"

211A-10

6"

2

5"

-

-

1

3"

211A-11

6"

2

5"

-

-

1

3"

211A-12

8"

2

5"

-

-

1

3"

211A-13

8"

2

5"

-

-

1

3"

211A-14

8"

2

5"

-

-

1

3"

211A-15

8"

2

6"

-

-

1

3"

211A-16

8"

2

6"

-

-

2

4"

211A-17

8"

2

6"

-

-

2

4"

211A-18

8"

2

6"

1

3"

2

4"

211A-19

8"

2

6"

1

3"

2

4"

211A-20

8"

2

6"

1

3"

2

4"

211A-21

8"

2

6"

1

3"

2

4"

211A-22

8"

2

6"

2

3"

2

4"

211A-23

8"

2

6"

2

3"

2

4"

211A-24

10"

2

6"

2

3"

2

4"

211A-25

10"

2

6"

3

3"

2

4"

211A-26

10"

2

6"

3

3"

2

4"

211A-27

10"

2

6"

4

3"

2

4"

211A-28

10"

2

6"

4

3"

2

5"

211A-29

10"

2

6"

5

3"

2

5"

211A-30

10"

2

6"

5

3"

2

5"

211A-31

10"

2

6"

6

3"

2

5"

211A-32

10"

2

6"

6

3"

2

5"

211A-33

10"

2

6"

7

3"

2

5"

211A-34

10"

2

6"

7

3"

2

5"

211A-35

10"

2

6"

7

3"

2

5"

211A-36

10"

2

6"

8

3"

2

5"

211A-37

10"

2

6"

8

3"

2

5"

211A-38

10"

2

6"

8

3"

2

5"

211A-39

10"

2

6"

9

3"

2

5"

211A-40

10"

2

6"

9

3"

2

5"

211A-41

10"

2

6"

10

3"

2

5"

211A-42

10"

2

6"

10

3"

2

5"

211A-43

10"

2

6"

11

3"

2

5"

211A-44

12"

2

6"

11

3"

2

5"

211A-45

12"

2

6"

12

3"

2

5"

211A-46

12"

2

6"

12

3"

2

5"

 

 

 

 

 

 

 

 

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Contents Series 211A Table of Contents Special Attention Boxes Using this ManualFollow the Piping Guidelines ControlsAIR for Combustion and Ventilation PreinstallationAccessibility Clearances Combustible Construction Clearances21 ft Required Volume other =Required Volume fan = 15 ft Input for all appliances in the space. See Btu/hr 22 cm 2 per 2000 W of total ratedCombustion Air Ducts Chimney or VentWhere Mechanical Combustion Air SupplyCombined vent breeching Exterior VentsVent Sizing Water Quality and MAKE-UP Boiler SettingInstallation Survey Boiler Foundation Layout Crate Items Base AssemblyAssemble the Base For 211A-04 through 211A-08 Only Install the Pilot BurnersModel Overall Length Base Front and Back Panel CratesTypical Gas Manifold and Pilot Line Assembly Burners Total Natural Gas Only Propane Gas Only Model NumberPilots Placing the Sections Place the Boiler SectionsPreparation Assembling Sections on Base Align Sections Vertically Hydrostatic Test the BoilerDo not tighten yet Install the Flue CollectorBoiler Position Return Piping Pipe the BoilerSupply Piping Pipe the Boiler Model Size Multiple Boiler InstallationsBoiler Header End Risers EqualizersPiping Multiple Boilers, Typical, Gravity Return Systems Apply Jacket END Assemblies Install the Jacket & Draft HoodApply Cleanout Cover Plates Prepare the PartsApply Plates and Labels Apply Lower END PanelsApply Jacket TOP Panels Top Panel GG-6024 Carton Contents Sub-Assembly Part Number Quantity Jacket Assembly Sequence Carton Numbers and Locations 13C Connect Pilot GAS Tubing Install GAS TrainInstall Vent and Bleed Piping Connect GAS PipingTest GAS Supply Piping Install GAS Supply PipingSpecific Gravity Multiply Capacity by Pipe Length 4 Pipe 2 PipeInstall Pressure Controls Install Controls and TrimInstall Safety Valves Install LOW Water CUT-OFFS Install Blowdown ValvesPressure Control Piping Fittings Included with Boiler Standard Float Type COntrol, Model 67PE2 Optional Float Type Pump Control/Low Water Cut-Off, Model Application of 51 Feeders Prepare Remaining Controls Wire the BoilerConnect Supply Wiring Install Control WiringTypical Wiring Standard Controls Low Voltage Gas Valves Typical Wiring Standard Controls 120-Volt Gas Valves Starting the Boiler Meter reading. Rate, Btu/Hr = F x H x Clean the BoilerCheck Boiler Controls Pilot Flame Failure Lighting Instructions TypicalTo Light the Boiler To Shut Down the Boiler Operation & Maintenance Pilot and Burner Flames Placing Boiler in OperationDaily Maintenance Monthly MaintenanceAnnual Maintenance Weekly MaintenanceProblem Possible Cause Suggested Remedy Troubleshooting Service TipsCorrect Piping Boiler Rating Information Boiler Ratings & DimensionsBoiler Ratings & Dimensions Series 211A Steam Boiler Dimensions Chart continues onSeries 211A Steam Boiler Dimensions Description Part Selection Information Stock Code Repair Parts Series 211ABase Front Panel Cover Plate 26 660 mm Wide Base Panel Boiler Assembly Base Assembly Page Series 211A