Silverback Slings

HHIperLift Spectra Slings

One of the most successful and popular offerings by Holloway Houston, HHIPerLift Spectra Slings are lightweight synthetic slings made to withstand large loads. Designed to offer exceptional performance under grueling conditions, they are capable of lifting loads anywhere from 8 tons to 600 tons at 5:1 ratio.

From hard items to fragile ones, you can use HHIPerLift Spectra Slings to lift any load. Resistant to physical and chemical abrasions, and exhaustion, these slings have become an industry standard. However, keeping with its tradition to provide the users with products made using the latest technology and performance specifications, Holloway Houston has relaunched HHIPerLift Spectra Slings as Silverback Slings.

Made with Honeywell Spectra® fibers, Silverback Slings are better and enhanced series of new-generation lifting slings made from space-age materials and high-tech design processes.

High Specific Modulus – Excellent for lifting and mooring in ultra-deep water, highly cut-resistant
Saltwater Resistance – 100% proof-tested for resistance to prolonged saltwater immersion at ultra-deep levels

PDF Download

General and Technical Data

High-Contact Rigging Efficiency (HCRE)

Most conventional roundslings, wire ropes, and braided ropes generally require reasonably large and fixed diameters in relation to the lifting potential. However, Silverback Slings offer superior rigging efficiency compared to their traditional counterparts.

Unlike braided ropes or helically-laid stranded yarns, Silverback Slings use a unique oversized triple cover with a parallel laid yarn inside. It allows you to reshape the slings, making them fit perfectly on the load-bearing surfaces.

You can use a smaller shackle as Silverback Slings increase the contact of lifting fibers with the pin. The reduced thickness of the fiber bundle in touch with the lifting area helps maintain the required 3:1 D/d ratio.

Silverback Slings have a design factor of 5:1 (ultimate = 5 times rated load). These slings are rated in tons. Users are advised to not exceed the rated capacity to avoid potential accidents.

Cross-Sectional Area

Measured in square inches, the cross-sectional area is the space occupied by the Silverback load-bearing wraps at rated capacity when pulled around a pin. Using the HH-75T-SP 75-ton as an example, the cross-sectional area is an exceptional 4.40 inches compared to other sling materials having a fixed cross-sectional area.

D/d Ratios

To achieve the loads it was designed for, the Silverback Sling System needs to have a minimum of a 3:1 D/d ratio. In other words, the size of the pin around which the slings goes must have at least three times the diameter of the sling at the bearing point.

Ratings & Design Factors

Sling ratings are based on a standard wide-body shackle (or equivalent bearing surface) of equal or greater capacity.

Ratings & Design Factors

Stronger: Silverback Slings have up to 40% higher specific strength compared to aramid fibers (Technora, Kevlar), along with excellent toughness and durability.
Lightweight: Silverback Slings are remarkably light; a vertical 15′ 75-ton sling weighs less than 75 pounds. As a result, you can manipulate them without the use of special equipment or work-rated ROVs.
Reduced Elongation: They have a maximum of 3.8% at breaking load.
Floatation Properties: They are lightweight with 0.97-g/cc density. So, they tend to remain relatively stable in the deep water.
Prolonged Saltwater Immersion Tolerance: The Honeywell Spectra® testing showed no reduction in lifting capacity after six months of saltwater immersion. It showed only 1% to 2% loss after 12 months of immersion.
They have excellent fatigue resistance.

Superior damping characteristics (vibration, shock, and impact): Silverback Slings can withstand high-load strain rate velocities.
High Specific Modulus: Excellent for lifting and mooring in ultra-deep water.
Exceptional high-pressure resistance.
High chemical resistance.
Good UV resistance.
Highly cut-resistant.
Made in America: All Honeywell Spectra® fibers and cover materials are manufactured in the U.S. Sling fabrication and load testing are performed at HHI’s Houston facility.
API-Q1 standards of design, calculation, and large sample testing, as well as other proven methods are used in the development of Silverback Roundslings.

HHIperlift High Performance Roundslings (HH-SP & HH-SPE)

HHI Part Number Endless Roundslings	HHI Part Number Eye and Eye Roundslings	Vertical WLL in M Ton	Choker Hitch WLL in M Ton	Vertical Basket WLL in M Ton	Approx. Wgt/Ft Length (lbs.)	Recomm. Wide Body Shackles	Body Dia
HH-18T-SP	HH-18T-SPE	18t	14.4t	36t	.81	18t	1.43
HH-25T-SP	HH-25T-SPE	25t	20t	50t	1.13	30t	1.75
HH-50T-SP	HH-50T-SPE	50t	40t	100t	2.26	55t	2.38
HH-75T-SP	HH-75T-SPE	75t	60t	150t	3.39	75t	2.86
HH-100T-SP	HH-100T-SPE	100t	80t	200t	4.52	125t	3.5
HH-125T-SP	HH-125T-SPE	125t	100t	250t	5.65	125t	3.89
HH-150T-SP	HH-150T-SPE	150t	120t	300t	6.78	150t	4.29
HH-175T-SP	HH-175T-SPE	175t	140t	350t	7.91	200t	4.77
HH-200T-SP	HH-200T-SPE	200t	160t	400t	9.04	200t	4.93
HH-225T-SP	HH-225T-SPE	225t	180t	450t	10.17	250t	5.57
HH-250T-SP	HH-250T-SPE	250t	200t	500t	11.30	250t	5.89
HH-275T-SP	HH-275T-SPE	275t	220t	550t	12.43	300t	6.21
HH-300T-SP	HH-300T-SPE	300t	240t	600t	13.56	300t	6.52
HH-350T-SP	HH-350T-SPE	350t	280t	700t	15.83	400t	7.16
HH-400T-SP	HH-400T-SPE	400t	320t	800t	18.09	400t	7.48
HH-450T-SP	HH-450T-SPE	450t	360t	900t	20.35	500t	8.43
HH-500T-SP	HH-500T-SPE	500t	400t	1,000t	22.61	500t	8.91

*Larger Capacities Available upon Request.