Long Reach Type Top Loading Arm B32F, B32RF
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      This popular OPW top loading arm is specifically designed for those applications where smooth handling and wide working range is required. Especially useful for top loading of railcars or multi-compartment tank trucks.
      The boom, supported by a high quality pillow block, allows for maximum flexibility and smooth operation combined with a significant longer reach.
      Both boom and arm can be folded back against the gantry for convenient, compact storage away from the traffic flow.
      Commonly used to handle high flow rates and withstand rough usage in railcar and tank-truck loading applications. A stable construction is guaranteed by the supported boom which allows optional Accessories to be mounted.
  • Features/Benefits
  • Accessories/Options
  • Loader Library
  • Loader Tech
  • Spare parts
  • Downloads

Features and Benefits

• Ideal for applications where a wide working envelope is required
• Easy to handle, smooth operation
• Compact storage when not in use
• All flanged construction for ease of maintenance
• Swivels equipped with grease nipple
• Durable construction
• Available in 2” / dn50, 3” / dn80 , 4” / dn100 and 6” / dn150 with ASA 150lbs RF or DIN PN10/16 inlet flange
• B32RF with inboard loading valve and remote control handle, B32F without valve
• Inverted intermediate swivel and/or inlet orientation, model B33RF or B33F, to assist self draining capability available
• Boom arm can be made with upwards or downwards slope
• Design allows for optional vapour recovery cone
• Adaptable to tight-fill or closed-system loading with optionally supplied swivels and couplers
• Alternative materials of construction Carbon Steel or 316/316L Stainless Steel
• Wide range of swivel seal material available
• Pre-balanced at the factory to minimise installation and commissioning time

Accessories / Options

Hi-Level Alarm- An effective means to prevent overfilling of tank is always suggested. In many cases both a primary (metering, scale/weight) and secondary (Hi-Level Alarm on Loading Arm) may be in place.
♦ For Clear, Light Non-Viscous Materials 

♦ For Dark, Viscous Materials
   A variety of probe styles, manufacturers can be adapted to fit on your OPW Loading Arm. We have experience with most major overfill brands.

Vapor Recovery- Concern for the environment and your employees is of utmost concern. Several options are available to help retain and recover harmful vapors and avoid excessive splashing, each customized to fit your application. For more information on Vapor Recovery Solutions: Loading Systems Catalog

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

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. 

Loading Arm Insulation Spec’s:
• Removable & Reusable
• Safer – Heated arms can pose a potential burn hazard to operators. OPW Insulation Packages ensures that the loading arm is properly insulated to protect your personnel.
• Superior Heat Retention 
• Durable 
• Construction Details:     - Inner Jacketing – 17 oz/sq. yd Teflon® Impregnated Fiberglass Cloth
    - Outer Jacketing - 17 oz/sq. yd Teflon® Impregnated Fiberglass Cloth
    - Insulation – 2” THK, low-density Fiberglass
    - Thread - Teflon®-coated Fiberglass Thread 
    - Attachments - Teflon® Cloth Belts with stainless-steel double-D rings; drawstring flaps with Nomex Cord
    - I.D. Tags – Stainless-steel embossed

Grounding/Bonding – Suggested for many top/splash loading applications. Available as an option on all Loading Arm designs. 
The electronic grounding unit MT30 allows safe loading and unloading of mobile tanks (mounted on trucks, wagons or trolleys and also big bags) in which flammable substances are poured at high speed generating electrostatic charges that can cause sparks and explosions.

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.  

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. 

Vacuum Breaker
OPW Engineered Systems Vacuum Breakers permit quick, positive evacuation of the arm after the loading operation is complete. Suggested for any top load/submerged fill application. 
• Model 476SA – Aluminum with stainless steel internals, fluorocarbon seal, ½ MNPT , OPW Model 476SA-0150
•Model 489 – 316 Stainless Steel construction, metal seat, MNPT, available in ½” (OPW Model 489-0050) and 1” (OPW model 489-0060)

Lockdown- available to help insure that your loading arm stays securely in vehicle during loading operation. Several options available depending on your application. 

Deflectors – Loading arm drop tube can be provided with deflector to help minimize the risk of staic build-up and/or product foaming. Can also be used to redirect the upward pressure in order to keep the arm from attempting to rise out of tank during loading. 
463 Deflector (Cone) 
- Aluminum Construction 
- 3” & 4”, FNPT 

464 Deflector (Tee) 
- Aluminum Construction 
- 3” & 4”, FNPT 

Strainers- Loading arm drop tube can be provided with a cast aluminum suction strainer when unloading tank cars. Helps prevent scale and other foreign objects from being sucked into line.
341 Suction Strainer 
- Cast Aluminum 
- Galvanized steel screen 
- 3” & 4” FNPT 

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)

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

Loader 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” Top Unloading Arm
       Ductile Iron/Carbon Steel/ Aluminum Construction
       Aluminum Load Valve
       77” x 77” x 43” Drop
With remote (B32RF-3)

Same as above in 4” (B32F-4)
       With remote (B32RF-4)

• Same as above in 6” (B32F-6)
       With remote (B32RF-6)

• 3” Top loading Arm
       Stainless Steel/PTFE Construction
       78” x 90” x 66” Drop
       60”x 60” x 60” Drop

Loader Tech

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.

Loading Arm Configurations

Spare Parts

Part number
2”/dn50 swivel Seal Replacement Kit [Tab], Viton® GFLT
3”/dn80 swivel Seal Replacement Kit [Tab], Viton® GFLT
4”/dn100 swivel Seal Replacement Kit [Tab], Viton® GFLT
6”/dn150 swivel Seal Replacement Kit [Tab], Viton® GFLT
2”/dn50 loading valve repair kit, Viton®
3”/dn80 loading valve repair kit, Viton®
4”/dn100 loading valve repair kit, Viton®