OPW Engineered Systems
Gas Strut Hose (GSH) Bottom Loading Arm

GSH Dimensions

GSH Order Guide

The GSH provides effortless bottom loading in petroleum-distribution terminals through the use of a unique operational capability known as the Velvet Touch.

The ability of 360-degree rotation in the horizontal plane allows the GSH to easily move from a parked to a loading position, and to service vehicles on either side of the loading bay. Additionally, the vertical-plane swivel allows users to position the coupler at different heights within the API envelope.

Features & Benefits:

• Velvet Touch Gas Struts provide smooth operation over the entire stroke of the loading arm
• Exceptional durability and minimal service requirements
• Any unit can be easily configured for left-hand, right-hand, upward and downward configurations on-site
• Enhanced strength and ease of adjustment through a heavy-duty adjustment mechanism
• Adjustable up/down stop that can be set with minimal effort
• Long reach capabilities, ideal for five-, six- and seven-arm bays

Technical Features

Materials	Carbon Steel/Aluminum
Seals	Low-Temp Flurocarbon
Working Pressure	80 PSI (5.5 Bar)
Test Pressure	120 PSI (8.2 Bar)
Operating Temperature	-20ºF to 140ºF (-29ºC tp 60ºC)
Up/Down Angular Movement	-15º to 15º (from horizontal)
Typical Horizontal Spacing	18" (457 mm)
Typical Vertical Spacing	18" (457 mm)
Typical Reach (radius)	60" to 90" (1,524 mm to 2,286 mm)
Nominal Diameter	4"
Typical Flow Rates (Velocities < 15 ft/sec (7.5 m/sec))	300-600 GPM (2000-3000 LPM)
Weight	~275 lbs*

Materials of Construction

Inlet Flange	4" 150 ANSI ASTM A105
Inlet Swivel	Investment Cast 4130 Steel
Primary Arm Piping	Sch 40 Aluminum ASTM B241
Apex Swivel (p/n 3640FT-0402)	Aluminum (Heat Treated)
Drop Hoses	(L19080) Braided Stainless Steel, TTMA Ends (L19081) Rackmaster Composite, TTMA Ends
Coupler Swivel (p/n VNI-A4VG)	Aluminum(Heat Treated)
Isolation Valve (LBV450VGL)	Cast Aluminum/Flurocarbon
Spacer Spool (p/nVSS4)	Cast Aluminum AA601
API Coupler (p/n 1004D3, Lynx852VG)	Aluminum/Flurocarbon, Low-Temp Flurocarbon

Additional Information

Weld Procedure	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 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

Recommended Spare Parts List**

Part #	Description	Where Used	Qty/Arm
3000RK-0402	3000 Series Swivel Seal Kit, 4" Flurocarbon	All Swivels (Counterbalance, Apex, Coupler Swivels)	4
1004D3SRK-0402	Coupler Seal Repair Kit, 4" Flurocarbon	1004D3-0402 (API Coupler)	1
API850VGSK	Coupler Seal Repair Kit, 4" Flurocarbon	Lynx852VG (API Coupler)	1