ROPE
INFORMATION
ROPE DIAMETER REFERENCE GUIDE
9 MM (23/64”) Expedition Caving, Personal Escape, Fixed Lines. Excellent strength/weight ratio.
10 MM (25/64”) Caving, Rope Access, Single Person Use. Preferred by experienced professionals.
11 MM (7/16”) Rigging, Caving, Rope Access, and Rescue. A practical
multi-purpose rope.
12.5 MM (1/2”) Fire-Rescue, Rigging in harsh environments. A reliable staple on any fire truck.
16 MM (5/8”) An extra heavy duty work horse that is easy to grip.
ROPE DIAMETER Just as no single type of rope will be appropriate for every life safety application, no one size will fit all conditions. A philosophy of “bigger is better” leads to problems in handling and compatibility with other equipment, while a philosophy of “lighter is righter” may result in a rope too small.
Consider that a larger size rope will weigh more; affecting how well a person can carry it. Even when rigged, the extra weight of a larger rope can make it more difficult to handle and manipulate. In fact, this extra weight could be critically unwieldy to a free-hanging user.
A larger rope may also not fit certain pieces of hardware. More and more high technical descenders and belay device are very rope diameter specific for proper operation. Always ensure compatibility between components in your system.
Rope elongation is partially a function of diameter. For the same type of rope construction and a given load, elongation will be less on a larger rope.
LIFE SAFETY ROPES Static or Low Stretch ropes intended for life safety applications are always clearly noted as being for that purpose, and should be labeled in accordance with appropriate life safety equipment standards. In the U.S., test methods for static and low stretch ropes are set by the Cordage Institute. Look for ropes tested to Cordage Institute standard number CI1801.
Commodity ropes, such as clothesline, tie downs, or hardware store rope should not be used for life safety.
ID TAPE Inside every PMI Life Safety rope is a marker tape that tells the story of that rope. From it, you can learn where, when, and by whom the rope was made. The marker tape runs the entire length of your PMI rope, repeating its key information every few feet.
MIDDLE MARK Every PMI Dynamic™ rope has a middle mark so you can find the middle of the rope with ease. If the black mark wears, you can easily reapply with the PMI®
Tec marker (page 20).
ROPE LENGTH When you buy a given length of PMI rope, we want to be sure you get what you pay for so we always add at least 2% more than the stated length on the label. Keep in mind, though... the fibers that rope is made of will shrink and stretch with weather changes and use. That’s why your rope might be longer on one day than the next!
ROPE ELONGATION Life Safety Rope is usually referred to in terms of elongation. Three common types of Life Safety Rope are Dynamic (high elongation for force absorption), Low Stretch (6-10% elongation @ 10% MBS), and Static (less than 6% elongation @ 10% MBS). These terms are merely descriptions by which ropes are ‘typed’ or categorized. The difference between Low Stretch and Static rope is relatively small. However, it is important to distinguish between these two when it comes to practical application.
!
High angle rope techniques are inherently dangerous. Please take the time to read and understand this catalog and all instructions that come with the equipment you purchase. The information in this catalog is provided for making purchasing decisions only and is NOT a substitute for competent instruction and training in safety techniques. It is the responsibility of the user of this equipment to obtain competent instruction and to take adequate precautions for safety when using this equipment. The equipment described in this catalog is designed and tested for use in rope access, rescue, confined space, climbing, mountaineering, and caving. Use in any other application is at the discretion of the user.
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PMIROPE.COM t 1-800-282-ROPE
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