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OPW Engineered Systems
Scissor Style (SCI) Top Loading Arm

Scissor Style (SCI) Top Loading Arm

Vendor: OPW Engineered Systems

Coupling Type: StandardLine Loading Arms


Scissor Style (SCI) Top Loading Arm

Coupling Category:

Top Loading Arms

SCI Order Guide

Primarily used to load tank trucks where the reaches will be less than 120” (3,048 mm). This versatile arm is designed specifically for top-loading installations where a variable operating range is required. The secondary arm rotates 360 degrees in the horizontal plane, providing a spotting allowance of up to twice its length.

Features & Benefits:

  • 3" and 4" sizes
  • Ductile Iron/Aluminum Construction
  • 3000 Series Swivel Joints
    • Simple, Proven Design
    • Carbon Steel/Aluminum Construction
    • Low-Temperature Fluorocarbon Seals
    • Wide Compatibility
  • 790 EZ Adjust Counterbalance
    • Safe, Easy Spring Adjustment
    • Integral Upward, Downward Travel Stops
  • Available with Loading Valve
    • Safety Closure will automatically close if left unattended
    • Remote Control Linkage allows operator to actuate valve while on truck

Technical Features

Materials Ductile Iron/Aluminum
Seals Low-Temp Fluorocarbon
Working Pressure 80 PSI (5.5 Bar)
Test Pressure 120 PSI (8.2 Bar)
Operating Temperature -20ºF to 140ºF (-29ºC to 60ºC)
Up/Down Angular Movement 70º to -20º (from horizontal)
Typical Horizontal Spacing 24" (610 mm)
Typical Vertical Spacing 15" (381 mm)
Typical Reach (radius) 60" to 108" (1,524 mm to 2,743 mm)
Nominal Diameter 3" and 4"
Typical Flow Rates (Velocities < 15 ft/sec (7.5 m/sec)) 300-600 GPM (2,000-3,500 LPM)

Materials of Construction

Inlet Flange 4" 150 ANSI ASTM A105
Inlet Swivel Carbon Steel ASTM A105
Piping Sch 40 Aluminum ASTM B241
Apex/Drop Tube Swivel (p/n 3640FT-0402)
Aluminum ASTM B26 A356 T6

Additional Information

Weld Protection Per the ASME Boiler & Pressure Vessel Code Section IX
Radiograph/X-Ray Per OPW Standard, 5% random/factory lot
Testing All assembled Loading Arms shall be tested to 1.5X the rated design pressure.
Surface Treatments All Carbon Steel/Ductile Aluminum components to be protected with a 2-part paint process. Aluminum components to be unpainted.
Lubricant OPW 880 High-Performance Synthetic Lubricant
Gasketing KlingerSil C5400
   WARNING: Cancer and
   Reproductive Harm -