S

The symbol used to indicate seale construction in an FSWR.

S TWIST

See ‘left hand lay’

SF

The symbol used to indicate seale filler wire in the construction of an FSWR.

SW

The symbol used to indicate seale warrington construction in an FSWR.

SWL

Safe working load.

SAFE WORKING LOAD

The maximum load which may be applied to a crane, hoist, rope, chain or sling for particular conditions of use.

SAFETY HARNESS

A body harness to which a lanyard or inertia reel can be attached to protect a person from falling or arrest a fall.

SAFETY HOOK

A hook provided with a safety latch across its throat intended to prevent a sling being accidentally dislodged.

SAFETY LINE

A horizontal rope or webbing anchored to two or more points of a building or structure and tensioned to provide an anchorage for a person wearing a safety harness to attach a lanyard or inertia reel.

SAG ROD

A stiffening member fixed between purlins or girts, generally at their mid span.

SEALE

A multi-layered strand construction method in FSWR where equal sized wires in one layer are laid over an equal number of smaller equal sized wires in the next layer.

SEALE WARRINGTON

A multi-layered strand construction method in FSWR where a seale laid layer is laid over a warrington laid centre.

SCAFFOLD

A temporary structure specifically erected to support access platforms or working platforms.

SCAFFOLDING HOIST

A serial hoist used with a suspension rope to raise and lower a cradle or boatswain’s chair during normal operation.

SCISSOR HOIST

An elevating work platform where the platform is raised and lowered using a scissor mechanism.

SECONDARY ROPE

A rope sometimes used on a suspended scaffold which does not normally support the cradle but which is rigged for use with a protective device.

SEIZING

A lashing for holding two ropes, or two parts of a rope together. Common types include round, square, flat, racking, throat and end seizings.

SENHOUSE SLIP

A tongued quick release device for chains or ropes. Often used to secure the anchor of a vessel.

SERVING

Winding marline, twine or annealed wire tightly around a rope, usually to protect a splice from damage and to protect the user’s hands from cuts.

SHEAVE

A grooved wheel or roller over which a rope or chain passes.

SHEERLEGS

A derrick like appliance consisting of two legs in an ‘A’ formation, with a sheave block fixed to its apex and the framework stabilised with guys.

SHORT SPLICE

A method of joining two ends of fibre rope. It is used where the spliced section does not have to travel over a sheave.

SHROUD LAID

A method of constructing a fibre rope using four strands layed around a core.

SIMPLY SUPPORTED BEAM

A beam which is fixed at each end.

SINGLE LADDER

A non-self supporting portable ladder whose length cannot be adjusted.

SINGLE WHIP

A fibre rope tackle where both the upper and lower blocks have single sheaves (two single blocks).

SISAL

Vegetable fibre obtained from the sisal plant. Sometimes used to construct natural fibre ropes.

SLEWING

The rotation of a crane’s boom or jib in the horizontal plane.

SLEWING CRANE

A crane with a boom or jib which has slewing capability.

SLEWING MOBILE CRANE

A powered mobile slewing crane. It does not refer to a front-end loader, backhoe, excavator or similar equipment when configured for crane operation.

SLING

Detachable lifting gear made from FSWR, natural fibre, chain, or synthetic fibre.

SNATCH BLOCK

A sheave block with a drop side to permit the bight of a rope to be placed or removed without reeving it through.

SNATCH LOADING

The sudden application of power to lift a load, causing large impact forces on the load and the running gear.

SNIGGING

Dragging a sling or dragging a load.

SNOTTER

A fibre rope sling.

SPANISH WINDLASS

A dangerous method of twitching tight the parts of a rope by placing a bar between them and taking several turns.

SPREADER BAR

A rigid member used to connect two trolleys from which a scaffold is suspended. It keeps the suspension points aligned when the cradle or working platform is traversed.

SPREADER BEAM

A beam with a central lifting attachment and with slinging points at each end. Used to reduce the angle of slings or to sling loads with large surface areas or to reduce the strain on a load.

SPECIAL DUTY WORKING PLATFORM

A platform on a scaffold designed for live loads greater than 675kg per bay.

SOCK

See ‘cable pulling stocking’.

SOFT EYE

See ‘bald eye’.

STANDING GEAR

Ropes such as guys and stays which do not run or work over sheaves or drums, and the gear used with such ropes.

STATIC LINE

See ‘safety line’.

STEP LADDER

A self-supporting portable ladder of fixed length having flat steps or treads and hinged back legs.

STIFF-LEG DERRICK

A derrick crane stabilised by rigid backstays and sleepers.

STOCKING

See ‘cable pulling stocking’.

STRAND

A number of wires or fibres layed in a spiral which are then layed up with other strands to form a rope.v

STRETCHING SCREW

See ‘turnbuckle’.

STRONGBACK

A temporary member fixed to a load to strengthen or stiffen it during lifting.

STROP

An endless sling.

Chain constructed with a stud across the centre of each link. Commonly used for marine purposes, the stud prevents the chain from jamming when it comes out of ships’ lockers. Unsuitable for general lifting purposes.

SUPER DUTY HOIST

A materials tower hoist with a WLL greater than one tonne. It is sometimes constructed as a dual tower with a materials platform in one tower and a concrete bucket in the other.

SUSPENDED SCAFFOLD

A scaffold incorporating a suspended platform which can be raised and lowered in normal use, including a boatswain’s chair.

SUSPENSION RIG

The portion of a suspended scaffold (including a trolley track) which is mounted at a higher level than the cradle and which supports and positions the cradle. Sometimes called a ‘roof rig’.

SUSPENSION ROPE

A rope used in a suspended scaffold to support a cradle.

SWAGED FITTING

A metallic fitting attached to FSWR using radial pressure to form an eye.

SWING STAGE

A suspended scaffold with a single row of suspension ropes.

SWIVEL

A rotating item of lifting gear which can rotate without spinning the rope, hook or load.

SYNTHETIC FIBRE

Manufactured fibre used in the construction of fibre ropes and slings, such as polyamide (nylon), polyester, polyethylene, polypropylene, etc.