OPW Engineered Systems
Scissor Style (SCI) Top Loading Arm

SCI Dimensions

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