ROPE
Rope is the foundation of any vertical system. That is why the PMI product design team puts so much effort into engineering maximum function, durability, and quality into our ropes. PMI ropes are built and independently certifi ed to applicable national and internationally recognized standards, and as added confi dence our own quality assurance program is registered to ISO 9001 Quality Registration. Our in-house laboratory is built to the same specifi cations as independent laboratories, and works twice as hard.
Made in the USA since 1977
PMI ROPE DESIGN AND INNOVATION Creating the High Angle Technician’s favorite rope is part science, part art. PMI’s 30-year reputation for creat- ing the toughest, most abrasion resistant, and most reliable life safety rope available comes from a refi ned blending of technology and passion. PMI helps drive research and testing in products, systems, and applications to make our products better so that your world can be safer. On the next few pages, you will fi nd information that we hope helps you come to know the PMI line you use and trust.
PMI has an entire team of dedicated professionals standing by, ready to help you with your gear needs. If you have questions regarding PMI rope, and products, please call 1-800-282-7673 or e-mail us at
custserv@pmirope.com.
WHAT’S IN A BRAID? PMI Classic ropes are characterized, at least in part, by their “16-carrier” sheath design. The term “16-carrier” refers to the number of yarn bundles used to create the braid that makes up the sheath of the rope.
One of PMI’s innovations, the PMI Navigator.
While PMI also offers 32 and 48-carrier braid designs, one advantage of PMI’s classic 16 carrier sheath de- sign is the dramatic increase it lends to the life and durability of the rope. For any given diameter rope, sheath yarns have to be thinner for more carriers and thicker for fewer carriers. Using 16 braid bundles for the sheath of PMI Classic allows us to use a thicker, more durable sheath yarn, resulting in a tougher, more durable rope. Sheath braid design is a fi ne balance between yarn denier, tension, number of carriers, and the amount of yarn used.
ROPE DIAMETER Just as no single type of rope will be appropriate for every life safety application, no one size will fi t all conditions. A philosophy of “larger 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 diffi cult to handle and manipulate. In fact, this extra weight could be critically unwieldy to a free-hanging user.
A larger rope may also not fi t certain pieces of hardware. Many conventional rope components, such as pulleys and ascenders, are designed for ropes with a diameter of 13 mm or less. 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.
16 CARRIERS A 16 carrier sheath provides the most longevity for your rope. Essentially, there are larger bundles, so there is more yarn to wear through before reach- ing the core. All of PMI Classic Static ropes have a 16 carrier sheath design.
32 CARRIERS It is common for low stretch ropes to be built with a 32 carrier sheath. This provides a fl exible hand, but of course the compromise of a more fl exible hand is always durability. PMI's Access Pro is an example of a 32 carrier rope that combines a fl exible hand with the best abrasion resistance possible.
48 CARRIERS Many of the dynamic ropes on the market are made with a 48 carrier sheath. The 48-carrier sheath is thinner than it's 16 and 32 carrier counterparts, but offers a soft hand for situ- ations where suppleness and elongation are of greater concern than abrasion, such as in recreational climbing.
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