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PTFE Lined Dip Tubes, Dip Pipes, Spargers & Diverters

Ethylarmor® PTFE lined and covered armored dip tubes and spargers are designed exclusively for the rigorous demands of agitating vessels or the high stress of injection. 

The Ethylarmor® product line includes DF (double flanged) Dip Tubes, SF (single flanged) Dip Tubes, Diverter Pipes, AGI Dip Tubes, Spargers, Solid PTFE Dip Tubes and Spargers, Solid PTFE Dip Tubes and Spargers, Extended Flares and Nozzle Liners.

In highly agitated services with highly viscous materials, the load on the dip tube must be determined. Information needed to calculate the load is performed with Ethylarmor® Calculations.

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diverter valves

Product Features & Benefits

  • HIGH TEMPERATURE CORROSION RESISTANCE: Ethylarmor® Dip Tubes and Spargers combine the high temperature and near-universal corrosion resistance of PTFEwith the mechanical strength of an encapsulated Schedule 80 carbon steel pipe for tough applications such as agitated reactors.
  • DURABILITY: Ethylarmor™ Dip Tubes and Spargers pass both the ASTM F423 steam-cold water cycle test and a 10,000-volt electrostatic spark test, the industry's most rigorous testing program. This virtually eliminates the possibility of heat-seal failure and resultant damage to the reactor's fragile glass lining.
  • DESIGN: A broad range of optional features are available to meet your process requirements. These include Diverters (to direct liquid/gas flow away or towards vessel walls), Extended Flares (to eliminate additional reducing flanges), Spargers, Anti-Siphon Holes, etc.
  • EXTENDED FLARE TECHNOLOGY: eliminates costly reducing flanges by allowing oversized mounting flanges to be integrated into dip tube fabrication. Extended Flare Technology is an important factor in the reduction of fugitive emissions; fewer connections mean fewer leak points. The extended flare is subjected to the same rigorous steam-cold water and a 10,000-voltage test as other Ethylarmor® products.
  • ELIMINATE DAMAGE TO FRAGILE NOZZLES: Used in glass-lined steel reactors and vessels, Ethylarmor® Nozzle Liners eliminate damage to fragile nozzles during the insertion and operation of dip tubes, spargers, and instrumentation. Nozzle liners also reduce erosion of the glass or alloy vessel nozzles by steam or abrasive materials, preventing process contamination and expensive repairs. Solids build-up is also reduced. They are provided in lengths to meet your exact requirements.
  • UNIQUE TIGHT RADIUS BEND: The Ethylarmor® Diverter Tube provides a unique tight radius bend capability when a diverter is required to deflect liquid or gas either toward or away from a vessel wall. The curvature at the bottom of the tube simplifies the installation of the dip tube in reactors with limited overhead space. Variations of the standard diverter's geometry can be accommodated in most cases.
  • VARIETY OF SIZES: Depending on your project, a variety of diameters and length configurations are available.
  • ENDURES DEMANDING CONDITIONS: Withstand the heat, corrosion, and stress of your most demanding processes.
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Ethylarmor® Double Flanged and Single Flanged Dip Tubes

These standard dip tubes can be supplied in a variety of diameters and length configurations. Maximum recommended unsupported length for agitated service is shown in the table below (a general guide only). Ethylene will review your specific service conditions and advise a suitable dip tube construction.

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Ethylarmor® SF and DF Dip Tube Dimensions

Nominal
Size
PTFE
Wall
Connecting
Flange
Mounting
Flange
PTFE Flare A T Max.
Max.
Max.
Unsupported
Length for Agitation
'C' 'M' FC FM OD L
All Dimensions in inches
*Denotes size Mounting Flanges available on SF type dip tubes.
3/4 .090 3/4 1-1/2 1-11/16 2-7/8 5 - 1-3/8 20'-0" 3'-0"
1 .090 1 2 2 3-7/8 5 - 1-5/8 20'-0" 3'-6"
1-1/2 .125 1-1/2 3
4
6
8
2-7/8 5
6-3/16
8-1/2
10-5/8
5 - 2-1/4
2-9/16
20'-0" 5'-0"
2 .125 2 3*
4
6
8
3-5/8 5
6-3/16
8-1/2
10-5/8
5 1 2-13/16
3
20'-0" 6'-0"
3 .125 3 4*
6
8
5 6-3/16
8-1/2
10-5/8
5 1-3/16 3-15/16
4-1/8
15'-0" 8'-0"
4 .150 4 6*
8
6-3/16 8-1/2
10-5/8
6 1-1/4 4-15/16
5-1/4
15'-0" 10'-0"
6 .150 6 8 8-1/2 10-5/8 6 1-3/8 7-1/16 10'-0" 10'-0"
8 .170 8 10 10-5/8 12-3/4 6 1-9/16 9-3/16 9'-6" 9'-6"
SF dip tube

DF Dip Tube

DF dip tube

SF Dip Tube

Ethylarmor® AGI Dip Tube

for Severe Agitation Service

The AGI Dip Tube is intended for use in services where the combination of length and loading prohibit the use of standard Ethylarmor® DF Dip Tubes. The larger outer diameter reinforcing pipe significantly increases the ability of the dip tube to withstand external loading. Severe agitation applications of smaller diameter Ethylarmor® dip tubes my require additional reinforcement of the dip tube. Ethylene™ can offer Schedule 120 or even Schedule 160 reinforcing pipe for special applications.

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Ethylarmor® AGI Dip Tube Dimensions

Nominal
Size
Connecting
Flange
Mounting
Flange
Reinforcing
Pipe
PTFE Flare A Max.
Max.
Entry
Length
'C' 'M' 'P' FC FM OD L
All Dimensions in inches
1 1" 4"
6"
8"
3" 2 6-3/16”
8-1/2”
10-1/2”
5" 3 15/16"
4 1/4"
4 1/4"
15'-0"
1-1/2 1-1/2" 4"
6"
8"
3" 2-7/8 6-3/16”
8-1/2”
10-1/2”
5" 3 15/16"
4 1/4"
4 1/4"
15'-0"
1-1/2 1-1/2" 6"
8"
4" 2-7/8 8-1/2”
10-1/2”
6" 4 15/16"
5 3/8"
15'-0"
2 2" 6"
8"
4" 3-5/8 8-1/2”
10-1/2”
6" 4 15/16"
5 3/8"
15'-0"
AGI Dip Tube

AGI Dip Tube

Ethylarmor® Solid PTFE Dip Tubes and Spargers

Ethylene's solid PTFE Dip Tubes and Spargers are fabricated from heavy-walled virgin PTFE tubes. All flanges are threaded onto the tube and pinned in place. Spargers are drilled to your specifications; number and diameter of holes, distance from the end of the tube and length of drilled section

Consult with our customer service team for applications involving nonstandard sizes or multiple bend configurations. The table below gives dimensions.

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Solid Dip Tube Dimensions

Nominal
Dia.
Nozzle
Size
OD ID A B R
All Dimensions in inches
1/2 1 1 1/2 1 2 4
1 1-1/2 1-3/8 7/8 1-1/2 2-7/8 6
1-1/2 2 1-7/8 1-1/8 1-3/4 3-5/8 8
2 3 2-3/4 2 2 5 10
3 4 3-1/2 2-1/2 2-3/4 6-1/4 16
4 6 4 3 3 8-1/2 20
Solid Dip Tube

Solid Dip Tubes, Diverters, and Spargers

Ethylarmor® Spargers

Ethylarmor Spargers are ideal for steam entrainment or other applications where diffusion of the process fluid is desired. The bottom section of the sparger is an integral part of the encapsulating PTFE liner. It is designed to provide a radial spray that can be tailored to your exact requirements. Spargers can be drilled to your specifications: number and diameter of holes, distance from the end of the tube, and length of drilled section can all be specified.

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Sparger Dimensions

Nominal
Size
Length Hole
Number
Hole
Diameter
Hole
Spacing
Angle
All Dimensions in inches
1 6 16 1/4" 1.02 60°
1-1/2 6 16 3/8" 1.47 60°
2 6 32 3/8" 1.25 60°
3 8 40 1/2" 1.38 60°
4 10 64 1/2" 1.77 60°
Sparger diagram

DF Sparger

Ethylarmor® Diverter Tube

A unique tight radius bend capability is ideal when a diverter is required to deflect liquid or gas either toward or away from a vessel wall. The curvature at the bottom of the tube simplifies the installation of the dip tube in reactors with limited overhead space. Variations of the standard diverter's geometry can be accommodated in most cases.

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Diverter Dimensions

Nominal
Size
B
(Nom.)
R
(Nom.)
A
(Nom.)
Max
OD
L
(Nom.)
All Dimensions in inches. See table below for connection and Mounting Flange Data.
1 4" 6" 5" 1-5/8 18"
1-1/2 5" 8" 5" 2-1/4 21"
2 6" 10" 5" 2-13/16 27"
3 6" 16" 5" 3-15/16 30"
4 8" 20" 6" 4-15/16 36"
Diverter diagram

Diverter Tube

Ethylarmor® Extended Flare Technology

Ethylene's Extended Flare Face technology eliminates costly reducing flanges by allowing oversized mounting flanges to be integrated into dip tube fabrication. This is also an important factor in the reduction of fugitive emissions; fewer connections mean fewer leak points. The extended flare is subjected to the same rigorous steam-cold water and a 10,000-voltage test as other Ethylarmor® products.

Extended Flare Technology diagram

Extended Flare Technology

Ethylarmor® Nozzle Liners

Used in glass-lined steel reactors and vessels, Ethylene® nozzle liners eliminate damage to fragile nozzles during the insertion and operation of dip tubes, Spargers and instrumentation. Nozzle liners also reduce erosion of the glass or alloy vessel nozzles by steam or abrasive materials, preventing process contamination and expensive repairs. Solids build-up is also reduced. They are provided in lengths to meet your exact requirements.

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Nozzle Liner Dimensions

Nozzle
Size
OD Flare
F
Wall
T
  Nozzle
Size
OD Flare
F
Wall
T
Diameters through 36" are available. Please consult the factory for diameters over 14" not listed. Note: Nominal dimensions shown.
1/2 1/2 1-3/8 1/16   4 3-13/16 6-3/16 1/8
3/4 3/4 1-11/16 1/16   6 5-3/4 8-1/2 1/8
1 15/16 2 1/16   8 7-3/4 10-5/8 1/8
1-1/2 1-7/16 2-7/8 1/16   10 9-3/4 12-3/4 5/32
2 1-15/16 3-5/8 1/16   12 11-3/4 15 5/32
3 2-15/16 5 1/8   14 13-3/4 16-1/4 5/32
Nozzle Liner Dimensions

Nozzle Liners

Ethylarmor® Calculations

Dip Tubes and spargers used in agitated service are subject to loads which under certain conditions can be so great that bending or complete failure of the unit can occur. Therefore, it is important that these loads be considered when designing or specifying a dip tube or sparger for use in highly agitated service with highly viscous materials. It is critical that the below Ethylarmor® Calculations are performed to calculate the load. 

To determine these loads, the following must be known:

  • V – Velocity of the process fluid past the tip of the dip tube (ft/sec)
  • D – Outside diameter of the dip tube (ft) See table
  • L – Entry Length of the dip tube (ft)
  • φ – Length of the dip tube immersed in fluid (ft)
  •  µ – Dynamic viscosity of the process fluid (lbs sec/ft2)
  • ρ – Mass density of the process fluid (slugs/ft3) [(1slug/ft3 =32.17lb/ft3)]

The total force exerted on the tube, F, can be determined from the above information. FT is the resultant of the drag and lift forces acting on the tube, FD and FL respectively. FT is given by Equation 1.

Equation 1

FT = √FD2 + FL2
The viscous drag force, FD, is defined by Equation 2.

Equation 2

when: A = φ D

FD = CD V2 ? A
            2

the lift force FL, created by alternate vortex shedding on the back surface of the immersed tube is given by Equation 3.

Equation 3

FL = CL ρ V2 A
            2

The coefficients for lift and drag, CD and CL, are based on the Reynolds number which can be calculated using Equation 4.

Equation 4

Reynolds Number,

R = ρ D V
            µ

CD can be gotten from Figure 1 shown below.

  • CL is as follows:
    • CL = 0.8
    • CL = 2.4 – 0.4Log10R
    • CL = 0.4
  • when:
    • (R < 105)
    • (105 < R < 106)
    • (R > 106)
graph of equation 4 for reynolds number

Equation 5

Equation 1 can be rewritten as:

FT = ρ V2 A√CD2 + CL2
            2

The value obtained by Equation 5 must be less than or equal to the maximum allowable load recommended by Ethylene Corporation for the selected unit. The maximum load, Sm, for dip tube or sparger is given by Equation 6.

Equation 6

Sm =WD
12(L -0.5φ)

where WD is the factor given in table If FT < Sm, the unit is sufficiently strong for the intended service. However, a check for resonance should be made.

If the natural frequency of the dip tube is too close to the wake frequency, resonance can occur in the dip tube causing stresses much greater than expected. The natural and wake frequency must be calculated and the ratio of these frequencies must be greater than v2 or less than 0.5.

The natural frequency of the dip tube can be calculated using Equation 7 where the value of factor H is taken from table.

Equation 7

Wn = 135 √H/L4

The wake frequency, W, is calculated using Equation 8.

Equation 8

W = 0.22 V
                D    

The ratio W/Wn should be less than 0.5 or greater than √2

  • Example 1: Dip Tube is Adequate

V, fluid velocity

= 15 (ft/sec)

Dip tube size

= 3” or 0.312 (ft) from the table

L, entry length

= 80” or 6.67 (ft)

φ, immersed length

= 65” or 5.52 (ft)

µ, dynamic viscosity

= 1.10 centipoise or 2.298x10-5 1lbs sec/ft2

ρ, fluid mass density

= 2.10 slugs/ft3

  • Step 1:

Determine Reynolds number,
R = (2.10• 0.312• 15)/2.298x10-5 =4.277x105

  • Step 2:

Determine CD and CL
CD = 0.90(Fig.1), CL = 2.4 – 0.4Log10R (4.277x105)=0.148

  • Step 3:

Calculate Force FT using Equation 5,
FT = 0.5• 2.10• 152• (.312• 5.42) x √0.92• 0.1482 = 364lbs

  • Step 4:

Calculate allowable force, Sm using Equation 6,
Sm = 48,970/(12•6.67-0.5•5.41)) = 1,030 lbs
Since 364 < 1,030 a 3” dip tube would be adequate for this application.

  • Step 5:

Determine the natural frequency, Wn, of the dip tube from Equation 7,
Wn = 135v147.024/6.674 = 36.8 Hz

  • Step 6:

Determine wake frequency, W, using Equation 8,
WD = 0.22• 15 / 0.312 = 10.6 Hz

  • Step 7:

Test ratio of W / Wn = 10.6 / 36.8 = 0.29
Since 0.29 < 0.5, the dip tube passes the test

 

Example 2: Dip Tube is Inadequate

V, fluid velocity

= 15 (ft/sec)

Dip tube size

= 1-1/2 or 0.179 (ft) from table

L, entry length

= 80” or 6.67 (ft)

φ, immersed length

= 65” or 5.42 (ft)

µ, dynamic viscosity

= 1.10 centipoise or 2.298x10-5 sec/ft2

ρ, fluid mass density

= 2.10 slugs/ft3

  • Step 1:

Determine Reynolds number,
R=(2.10• 0.179• 15)/2.298x10-5=2.454x105

  • Step 2:

Determine CD and CL
CD =0.90 (Fig.1), CL = 2.4-log10 (2.454x105) = 0.244

  • Step 3:

Calculate force FT using Equation 5,
FT = 0.5• 2.10• 152• (.179• 5.42) x √0.92• 0.2442 = 214 lbs

  • Step 4:

Calculate allowable force, Sm using Equation 6,
Sm= 9064/(12•(6.67-0.5•5.41)) = 191 lbs
Since 214 < 191 a 1-1/2” dip tube would NOT be suitable for this application.

  • Step 5:

Determine the natural frequency, Wn, of the dip tube from Equation 7,
Wn = 135√41.62/6.674 = 24.8 Hz

  • Step 6:

Determine wake frequency, W, using Equation 8,
WD = 0.22• 15 / 0.179 = 15.1 Hz

  • Step 7:

Test ratio of W / Wn = 15.1 / 24.8 = 0.61
Since 0.5 < 0.61 < √2, the dip tube fails the test

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