Tiger "SS20" Corrosion Resistant Manual Chain Block

The Tiger Lifting SS20 Corrosion Resistant Hand Chain Hoist (which supersedes the SS12 XCB manual chain block) is manufactured from the highest quality steel materials precisely machined in there own factory, offering a lightweight, compact and rugged construction, producing an exceptionally strong product resistant to impact damage.

The especially low headroom allows for easy installation in the most restricted environments. The unique design features listed below give it significant safety advantages over standard chain blocks and make the SS20 chain block the ideal tool for saltwater use with low maintenance and servicing costs.

These units meet and exceed all the requirements within BS EN 13157: 2004+A1:2009, ANSI/ASME B30.16, AS1418.2* and SANS 1594. Tiger Hoists fitted with overload limiters comply fully with NORSOK R-002. * When fitted with load bearing swivel hooks, Tiger hoists comply fully with AS 1418.2

Key design features such as the patented brake pawls and deep pocket design hand wheel along with the full and comprehensive testing regime they have submitted the SS20 hoist to provide the evidence that allows us to state that these units can be safely used for “fleeting”, “drifting” and “cross-hauling” applications up to 45° from the vertical without deration.

With over 50 years of professional manufacturing experience, Tiger’s commitment to innovation and customer satisfaction mean we will continue to develop and improve our products by communicating and working with our customers. The SS20 range of chain blocks incorporates Tiger Lifting's latest developments and enhancements.

SS20 Features

• Suitable for use in multi-immersion applications.
• DNV GL Verification tested according to NORSOK R-002.
• Range from 0.5 – 20.0 Tonne.
• Patented Quad Cam Pawl System.
• Phosphor Bronze Bearings.
• Tested and certified for “fleeting”, “drifting” and “cross-hauling” applications up to 45° from the vertical without deration.
• Guaranteed 2% light load protection.
• Fully Corrosion protected body and components to ensure reliable long-term use.
• Over 1500 hours protection to ASTM B117 conditions.
• Corrosion protected load and hand chain.
• Double cover protection for brake chamber.
• Marine chain bags available on request.
• Available with slipping clutch overload protection.

Brake Efficiency

Tiger SS20 lever hoists utilise an 8 point multi-start thread pinion shaft which doubles the lead distance compared with typical 4 point threaded shafts, increasing the brake efficiency by 100%. The rotational engagement of the brake works with the direction of the load sheave creating highly efficient braking ratios. With our fine manufacturing tolerances between the pinion shaft thread and critical brake components we have engineered out a known failure mode where contamination to the threads can lead to brake failure or slippage.

Patent Protected Quad Cam Brake Pawl System

The patented Quad Cam Pawl System guarantees permanent engagement of at least one of the two reciprocating cam pawls fitted to the SS20, ensuring the pawl only just clears the ratchet wheel, with the minimum of clearance as required under BS 4898:1973. But most importantly, in the unlikely event of a pawl spring failure, this design will ensure the brake is still fully functional and the load is sustained without damage to the mechanism.

Forgings

Recessed hook yoke forgings offer full protection to the load chain anchor bolts on all our bottom hooks. Precise tolerances in the bottom hook yokes means foreign objects are restricted from entering the load sheave area.

Bonded Marine Friction Discs

The bonded marine friction discs are free of asbestos and have been developed and designed for subsea use creating a highly efficient, reliable braking surface for use in the most extreme conditions. These models are supplied with a grooved friction disc system which assist with dispersing salt water from between key surfaces therefore eliminating failure through aquaplaning (where a layer of water builds between brake surfaces leading to a loss of friction).

Chain End Stops

Will hold a load of at least 2.5 times the rated capacity when supporting the full load without restraint from other components e.g. brake or gearing as required in many international standards. This prevents accidents, by acting as a stop when the lift length of the load chain is exceeded when lowered.

Phosphor Bronze Bearings

The Tin content increases the corrosion resistance and strength of the alloy, the Phosphorus increases the wear resistance and stiffness of the alloy. Needle Bearings have been proven to be unstable and unsuitable for offshore and marine environments.

Double Cover Protection

Both the hand chain wheel cover and the ratchet brake cover are designed to offer protection to the brake chamber in the harshest environments from foreign objects.

Hoist Hooks

The hooks incorporate our latest Patent Pending “EZ Check” feature which allows operators and inspection engineers to easily check to see if the hoist has been previously overloaded or shock loaded by simply measuring between the triangle of pop marks.

Drop forged and heat treated alloy hooks are furnished with heavy duty spring latch kits that fully engage into the recessed nose of the hook safeguarding the load when side loading of the latch occurs and offering maximum load security. The swivel hooks are attached to the yoke using high grade nuts & bolts allowing for complete inspection during any statutory inspection or written scheme maintenance.

The entire hook fitting has been protected using OCP or stainless steel fixtures and fittings. Our latest latches incorporate a new wing design making them easier to operate in the operation area (e.g. wet gloved hands for offshore or subsea use).

Available with hooks that swivel under the full working load limit, to meet relevant standards i.e. AS 1418.2. Also available with spark resistant hooks.

Protection and Finish

SS20 hoists have a distinctive body and hooks to clearly define use in a marine environment.

Internal components are corrosion protected using our own unique formulation giving unprecedented long-term levels of corrosion protection. Stainless steel fittings are used throughout the hoist. These ensure the initial capital outlay of purchasing the SS20 is protected by allowing the statutory inspections and re-certifications to be easier and also help with the overall aesthetics of the hoist being maintained in an “as new” condition.

Tiger Lifting have carried out intensive internal testing on components to ensure we achieved over 1500 hours protection to ASTM B117 conditions.

SS20 hoists are completed with a two-stage finish combining electroplating as a base layer and then finished with a very hard wearing sand texture powder coating paint which offers excellent corrosion protection and high impact protection.

The lessons learned from previous models have allowed Tiger to once again raise the bar with the SS20 in giving longer life corrosion protection ideally suited for multi-immersion applications.

Multi-Fall Load Sheave Bearings

Incorporating DU® self-lubricating metal polymer bearings into the multi chain fall load sheaves. Their success lies in the unique composite bearing structure comprised of a steel backing for mechanical strength and a porous sintered bronze interlayer impregnated with PTFE and lead for high wear resistance and extremely low friction properties. This makes them ideally suited to hoists used subsea. They provide improved energy efficiency due to low friction of PTFE-enriched overlay and have an extended service life with a strong wear-resistant bronze layer. There is zero maintenance as self-lubricating bearings can operate perfectly dry but have greater reliability with lubricant to avoid potential shaft/bearing seizure under boundary conditions.

Overload Protection

The SS20 chain block can be fitted with a slipping clutch overload mechanism to protect it from overload. When the load limit is exceeded, the clutch in the chain wheel will slip, allowing the handle to be operated whilst not engaging the gear box. This prevents further lifting of the load, though lowering is still possible. The SS20 with overload protection is DNV GL Verification tested according to NORSOK R-002.

Safety Brake

The highly efficient and fully corrosion protected brake system works instantly when the operation is stopped and securely holds the load. Loads are lowered under perfect control, allowing for precise operations. The SS20 easily passes the “brake lock out test” as per BS 3243:1990 with a 2% load of the rated capacity.

Light Load Protection

The SS20 brake system guarantees a light load protection at 2% of the rated capacity.

Load Chains

Tiger only use the highest quality alloy, calibrated load chains in Grade T or VH conforming to EN818-7 and ISO 16872. These chains have been protected using OCP protection without any loss of mechanical performance. The SS20 comes as 3.0mtr HOL as standard but can be chained up to whatever length is required. Stainless steel load chain available on request for certain capacities.

High Performance Premium Grease

Using new technology, wide temperature range, high performance premium grease. It contains no heavy metals or other harmful or environmentally undesirable additives such as sulphur, phosphorus, chlorine, zinc, phenols, antimony, barium or lead. This selection achieves the correct viscosity to prevent the grease migrating from the area of application. Even when mixed with 50% high water absorption we achieve excellent adhesion and no sign of breakdown after 100,000 strokes and remains unchanged with no slump or breakdown unlike other “premium” greases. Load carrying ability, mechanical stability, corrosion protection, water resistance and increased operating temperature ranges are all improved by the using only the very best lubricant.

Lifting at Angles

The SS20 range of chain blocks fitted with the patented protected Quad Cam Brake System has undergone a full and comprehensive testing regime that was drawn up by industry specialists and Tiger’s mechanical engineers to provide evidence that these units can be safely used for “fleeting”, “drifting” and “cross-hauling” applications up to 45° from the vertical without deration. Note: All such operations should be carried out in accordance with manufacturer’s instructions and fully risk assessed by a competent person.

With a conventional twin pawl brake mechanism (teardrop design) failure can occur if the pawl spring erodes, fractures or a shock load bounces the pawls out of the ratchet gear. Without the spring these systems rely on gravity keeping the pawls engaged and are flawed when the hoist is used at angles away from the vertical.

Hand Wheel

For chain blocks to be used up to an angle of 45 degrees, it’s critical that the hand chain leaves and enters the hand wheel without twisting, snagging or jamming. Thanks to the specially designed deep-profile chain block hand wheel this is achievable as it helps to seat the chain no matter what angle or direction of pull.

Temperature Range

Operating temperature range -40°C to +50°C - far exceeding the requirements of current standards.

Mechanical Efficiency

All major components are heat treated and precisely machined to ensure long term smooth operation. High gear ratios keep physical effort to a minimum.

Adaptor Fittings

Drop forged adaptor maintaining maximum strength. 360° rotation and 180° pivot for maximum flexibility. Tested and certified to 4:1 factor of safety.

SS20 Performance

The SS20 has undergone a full test program that includes:

Type Testing

• Ultimate strength test, at least 4 times the Working Load Limit (WLL).
• Continuous cyclic testing of over 1500 cycles.
• Chain end anchorage test, passing at least 2.5 times the WLL without any restriction of the brake or gear

Test on every hoist

• Proof loading at 1.5 times the rated capacity.
• Light load testing at maximum of 2% rated capacity.

Drop forged adaptor maintaining maximum strength. 360° rotation and 180° pivot for maximum flexibility. Tested and certified to 4:1 factor of safety.

The SS19 lever hoist has undergone a full test program that includes:

Type Testing

• Ultimate strength test, at least 4 times the Working load limit (WLL).
• Chain end anchorage test, passing at least 4 times the WLL without any restriction of the brake or gears.

Test on every hoist

• Proof loading at 1.5 times the rated capacity.
• Light load testing at maximum of 2% rated capacity.

Adaptor Sling Hook

Safety Hooks

Reevable Egg Link

Hoist Clevis Shackle

After successfully completing a series of third party verification and testing programmes to beyond established international standards, the latest being a multi-immersion programme of tests over 54 days independently carried out and verified at ORE Catapult in the UK (a leading technology innovation and research centre for offshore renewable energy), Tiger Lifting can state that the SS19 range of lever hoists is suitable for use in multi-immersion applications providing the timescales, pre-use testing, maintenance and service requirements as detailed in Tiger document Multi-Immersion Instruction Manual are strictly followed.

Tiger Lifting used a subsea dock including a replica seabed

Saltwater was pumped in from the Blyth Estuary (North Sea)