In the industry there is a misconception that portable outrigger beams and parapet clamps being used with powered suspended access equipment can be tied back using fibre rope, and often times it is old vertical lifeline rope that is used for this application.  However, using rope in this application is an incorrect practice.

Under the national CSA Safety Code For Suspended Platforms, the tieback cables for portable outriggers and parapet clamps must be of equal strength as the primary suspension rope.  Since most powered climbers use a 5/16” or 8.4mm diameter wire rope that has a breaking strength of 10,000+lbs, the use of 5/8” polysteel lifeline (which has a breaking strength of only 9,000 lbs when new) is not adequate.  In addition to that, ropes are usually terminated at the anchors with knots, and ANY knot will reduce the strength of rope by at least 25%.  While ropes of the proper strength and construction (and when terminated with the proper approved knots) can be used with rope access systems and manual bosun’s chairs, they should never be used with any powered suspended equipment that has wire rope as the primary suspension line.

At Northern Strands, we will always supply the proper tieback cables and wire rope clips for this connection, and provide complete instruction on proper rigging of tieback cables as part of our Suspended Access Equipment Training course.

The picture below shows an example of a correct outrigger tieback with wire rope

For more information visit http://www.northernstrands.com/suspended-access-systems.aspx

"Northern Strands is proudly Saskatoon, Saskatchewan owned and operated."

In order to fully understand the importance of the regular application for wire rope lubrication during the working life of stranded or full locked coil hoisting ropes, it is first necessary to analyze the function of any such lubricant.

a) Each wire in any wire rope construction must remain as free as possible from adjacent wires so it can move to accommodate its allocated share of the varying rope tension it has to endure.  This is especially important when the rope is performing at high speed and/or under the high wire contact stresses encountered during hoisting.  Rope design is intended to minimize inter wire frictional contact but only by good lubricating practices can this effect be fully accomplished.

b) The majority of hoist ropes utilized in shafts are subject to corrosion from one cause or another. Shaft water containing a high salt content, chemical fumes, and upcast shafts producing condensation, are among the more notable causes.  Regardless of the cause, it is essential to guard against or retard the certainty of corrosive attack on the steel.  Experience has shown that the application of galvanized wire is only partially successful because the finish soon wears off. Therefore, it is clear that in-service lubricants must possess the following qualities:

a) Penetrate easily into the rope.
b) Displace moisture from the internal and external surfaces.
c) Provide good corrosion protection both internally and externally.
d) Be resistant to emulsification.
e) Possess good rope adhesive properties.
f) Resist removal by mechanical forces.
g) Possess good anti-wear properties.
h) Be compatible with the lubricant already employed during rope manufacture. 

It should be pointed out that in the case of full locked coil and many plastic enhanced hoisting ropes, in-service lubricant is confined solely to the outside wire. This is because the inner rope is already sealed off with adequate lubrication. 

Without lubrication during the working life, wire ropes may suffer from premature withdrawal from service:

1) Premature wire breaks occurring in the ropes and caused by internal and/or external corrosion.

2) Premature wire breaks occurring at the strand interstices due to lack of proper inter strand movement.

3) Strand displacement, loose wires, and rope waving, leading to loss of cross section stability. Additionally, the correct lubricant is of key importance during rope manufacture.  Through a German study (see chart below), it is proven that the proper lay-up lubricant can have a great effect on rope life. 

The chart depicts:

• Wire rope un-lubricated
• Wire rope lubricated, but with general lubricant not designed for wire ropes
• Standard lubricant designed for wire rope wires
• Wire rope application-specific lubricant Plastic enhanced

Northern Strands is an official supplier of Kirpatrick Lubricants in Canada.

Northern Strands is proudly Saskatoon, Saskatchewan owned and operated.

The Northern Strands Safety Division has developed a multitude of Safety Training Courses to meet industry needs.  We now offer the following Safety courses; Fall Arrest training, Tugger / Winch training, Wirelock Socketing training, Crosby Rigging training, First Aid / CPR and Swing Stage training.  All of our safety courses meet and exceed Saskatchewan Occupational Health and Safety standards.  Northern Strands Safety Training Division is now an industry leader in construction safety training in Saskatoon and Saskatchewan.

Link to Training Division webpage: http://www.northernstrands.com/training.aspx