Roberts Gorden CRV-B-9 service manual Tailpipe Design Method, Rule of Thumb Unshared Calculations

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CRV-SERIES DESIGN MANUAL

EXAMPLE 3: B-10 Radiant Tube vs. Tailpipe Length

For a B-10 burner system of 200 flow units and an average of 40' radiant tube length per burner, See Page 17, Table 4 for the tailpipe lengths per flow unit that can be used and the corresponding operating characteristic.

From Table 4, we can use between 1.2' per flow unit and 2.5' per flow unit when the average radiant length per B-10 burner is 40'. By multiplying the number of flow units in the system (200 flow units) by the mini- mum tailpipe length from the chart (1.2' per flow unit), we see that we will need a minimum of 240' of tailpipe for this system. Likewise, by multiplying the number of flow units in the system (200 flow units) by the maxi- mum tailpipe length from the chart (2.5' per flow unit), we see that maximum system, tailpipe length is 500'.

Tailpipe length range for a B-10 burner system with 200 flow units and an average radiant tube length of 40’ is 240'-500'. The length of the tailpipe will determine whether the system is condensing or non-condensing. Given a certain radiant tube length and tailpipe length, the operating characteristic can be determined using Table 5.

Table 5: Operating Characteristics; Condensing or Non-Condensing

 

 

Tailpipe Length per Flow Unit

 

 

 

 

 

 

 

 

 

Minimum

 

Recommended

1.7 ft/flow unit

 

Maximum

 

 

 

 

 

 

 

Radiant Tube Length (average distance between burners)

 

 

 

 

 

 

 

 

 

 

 

 

 

Minimum

N/A

 

NC

Borderline

 

C

 

 

 

 

 

 

 

Recommended

NC

 

Borderline

C

 

C

 

 

 

 

 

 

 

Maximum

Borderline

 

C

C

 

C

 

 

 

 

 

 

 

N/A=Not Allowed NC=Non Condensing C=Condensing

6.5 Tailpipe Design Method

Given the overall length of tailpipe for the system, the following section provides the method for ensuring the design will function correctly.

Total tailpipe

 

' (includes 1 elbow / 50').

6.5.1 Rule of Thumb Unshared Calculations

Total tailpipe - 10'

= Optimum unshared

Number of branches

tailpipe per branch

the section of tailpipe.

If flow units entering a shared tailpipe system exceed 90% of pump capacity, the length of 4" diameter tail- pipe must not exceed 20'.

System with EP-300 Series Pump

For shared tailpipe up to 115 flow units, 4" diameter tailpipe can be used. See Page 14, Figure 15 for max- imum permissible length of tailpipe for the number of flow units entering the section of tailpipe.

Select a pump discharge location and plan the route of the tailpipe. For example system layouts See Page 21, Figure 18 through Page 25, Figure 26 for different pump and system efficiency requirements. If these lay- outs are not suitable, it is necessary to customize the layout for the CRV-Series system to the individual building requirements.

For multiple branch systems, always plan to connect the unshared tailpipe together as close to the pump as possible for better system efficiency.

6.5.2 Shared Tailpipe Calculation

System with EP-100 or EP-200 Series Pump

Shared tailpipe greater than 115 flow units use 6" diameter tube. Note that all tailpipe lengths for the pur- poses of calculation are expressed in terms of 4" diameter tube.

Effective length: 10' (3 m) of 6" (15 cm) diameter tube = 13' (4 m) of 4" diameter tube.

6.5.3 To Calculate the Total System Tailpipe

Total unshared tailpipe + shared 4" branch tailpipe + effective length of shared 6".

6.5.4 To Check Performance Criteria

Total system tailpipe

= Tailpipe ft/flow unit

Total flow units

 

See Page 14, Figure 15 for maximum permissible

length of tailpipe for the number of flow units entering Compare the results to Page 17, Table 4 and Page 18,

18

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Contents Design Manual Page Roberts-Gordon LLC Page Table of Figures Page Concept Safety CRV-SERIES SystemZero Regulator Assembly Overview Two Branch System Shown Fuel Savings and Comfort Clearances to combustibles at all times for safety Standard Reflector ONE Side ReflectorUniversal SHIELD, Position Foot Deco Grille Radiant Adjustment to Heat Loss Radiant Height Adjustment FactorSizing and Design Considerations ExampleSelecting the Burners Radiant DistributionRadiant Distribution Average Coverage Radiant Distribution Increased Coverage= mounting height Flow Loading Radiant Branch FlowBurner Flow Units Pump Capacity Tailpipe FlowPump Exhaust Length Requirements Radiant Tube and Tailpipe Radiant Tube LengthMinimum Radiant Tube Length Maximum Radiant Tube LengthDesign Parameters Pump Model Series Maximum LoadingCRV-Series Design Methods Flow Units Per BranchAfter Each Burner Allowable Tailpipe Lengths Burner ModelTailpipe Design Method Rule of Thumb Unshared CalculationsSystem with EP-300 Series Pump To Calculate the Total System TailpipeDamper Couplings Possible Damper Coupling Locations Example CRV-SERIES System Layouts Example System Layout Option12 m 10 3 m 20 6 m 12 m Tailpipe 10 3 m 100 30 m Example System Layout Option 7, 8 Control Methods Roberts Gordon System ControlRoberts Gordon Ultravac Corayvac Modulating ControlsAnalog Signal Modulating Thermostat MS/TP WiringPressure Switch Spst Transformer Relay Kit P/N 90417600KAIR Supply System PressurizedNon-Pressurized Pressurized SystemsPipe sizing Duct Design RulesBlower P/N 90707501K Performance 112 Flow Units Sample Layout for Pressurized Outside Air Systems Roberts Gordon Ultravac Design Requirements CRV-SERIES Equipment Specifications
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CRV-B-9 specifications

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