Unsupported Boom Bottom Loader

Designed to provide flexible long-range operation, the heavy-duty unsupported boom type bottom loader configuration is both reliable and easy to use. A minimum of five swivel planes of rotation offer complete flexibility in making tight connections for loading and unloading rail cars and tank trucks. The outboard swivel and arm adjusts for any changes in elevation or tilting that may result as the vehicle is loaded or unloaded. The unsupported boom type loader is extremely versatile and many variations are possible. It can be equipped with dry disconnect coupler, union, quick coupling, or other customer specified end fitting to make connections on the side, at the rear, or underneath the vehicle. The intermediate swivel is often 2” – 6” sizes available  inverted to achieve the low profile and clearances needed to connect to the underside of a rail car. 

Typically installed at or near ground level, arms of varying lengths can be mounted on staggered risers to achieve crossover and neat compact storage of multiple arms in a confined space.

  • 2” – 6” sizes available
  • Carbon Steel, Stainless Steel and Aluminum options 
  • Ideal for Railcar Unloading applications 
  • Fully customizable

Features/Benefits

  • Easy to operate/maneuver 
  • Eliminates cumbersome hose 
  • Low Profile with long reach, ideal for railcar unloading 
  • Accommodates changes in elevation 
  • Can be safely stored to provide for safe clearance of vehicles 
  • Easy to connect under the vehicle 
  • Very flexible to compensate for vehicle misplacement 
  • Scissor-back storage means no wasted space 
  • Compact storage, can be stored in ‘jack-knife’ position

Accessories

Heating – Loading Arms can be fully or partially jacketed for efficient handling of asphalt, molten sulfur, waxes, resins and other products that are highly viscous or tend to solidify at ambient temperatures. Click here for more information on OPW Heated Loading Solutions. 

Loading Arm Insulation – OPW can provide a Custom Insulation Package designed specifically for your loading arm. Unlike field-applied insulation, these packages are completely removable and reusable, making them the ideal solution for loading arm use. Click here to view Loading Arm Insulation Specifications.

Grounding/Bonding – Suggested for many top/splash loading applications. Available as an option on all Loading Arm designs. 

Electronic Ground Verification 
The Civacon model 8030 Ground Verification Monitor is compatible with today’s transport ground systems. The monitor is equipped to provide a permissive signal to allow load rack operation and, if ground is lost, to indicate a non-permissive signal and shut down the loading operation.

 
Safety Breakaway Coupling  
Protects your equipment, piping and personnel in the event of an unintended pull-away. A consideration whenever you are making a tight connection to a truck or railcar.

Quick & Dry Disconnect Couplings
With OPW, you have many options at your disposal for your loading arm termination connections. From the original quick-disconnect Kamlok® coupling to our Epsilon™ dry disconnect coupling, we have a coupling to meet your needs. 
 
API Bottom Loading Couplers
Commonly used for loading Petroleum products, OPW provides several options for loading your Petroleum transports.

Loading Valves

  • 6400 Series Horizontal Valve – OPW Loading Valves are designed to shut off flow without causing shock in the pipeline. 
    • Adjustable closure rate 
    • 3” & 4” sizes, Aluminum Construction 
    • TTMA Flanged connections 
    • Ball Valves (per application/specification)

Pneumatic Counterbalancing – An alternative to conventional spring balanced loading arm, pneumatics provide the ultimate in loading arm design.

Library

All OPW Loading Arms can be customized to fit your specific application requirements. We do offer a series of Standard/ optimized solutions that are commonly specified. These optimized selections can be expedited to meet faster delivery requirements.

3” Bottom loading Arm
    Ductile Iron/Carbon Steel/ Aluminum Construction
    42” x 66” 
    G32FNV-3  
Same as above in 4” (G32FNV-4)

Technical

Click on the title below to view the technical information.

Loading Arm Velocities What size pipe do I need?

Velocity in ft/sec.

 

Velocity in m/sec.

GPM

2"

3"

4"

6"

L/min.

2"

3"

4"

6"

100

9.6

     

400

3.1

     

125

12

     

600

4.6

2.1

   

150

14.3

     

800

6.1

2.8

   

175

16.8

     

1000

7.7

3.5

2

 

200

19.1

8.7

   

1250

9.6

4.4

2.5

 

225

21.5

9.8

   

1500

 

5.2

3

 

250

23.9

10.8

   

1750

 

6.1

3.5

 

300

 

13

7.5

 

2000

 

7

4

 

350

 

15.2

8.8

 

2250

 

7.9

4.5

2

400

 

17.4

10.1

 

2500

 

8.7

5.1

2.2

450

 

19.6

11.4

 

2750

   

5.6

2.4

500

 

21.7

12.6

5.6

3000

   

6.1

2.6

550

 

23.9

13.8

6.1

3250

   

6.6

2.9

600

   

15.1

6.6

3500

   

7.1

3.1

650

   

16.4

7.2

3750

   

7.6

3.3

700

   

17.6

7.8

4000

   

8.1

3.6

750

   

18.9

8.3

4500

   

9.1

4

800

   

20.2

8.9

5000

     

4.5

900

   

22.7

10

5500

     

4.9

1000

     

11.1

6000

     

5.3

1200

     

13.3

6500

     

5.8

1300

     

14.4

7000

     

6.2

1400

     

15.6

         

1500

     

16.7

         

1600

     

17.8

         

1700

     

18.9

         

1800

     

20

         

Velocities above 15 ft./sec. (4.6 m/sec.) are generally not recommended - Bold are recommended.

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