Lois P. Sicking, Mechanical Engineer
SEMIRIGID RUBBER-BRAIDED WIRE-REINFORCED SUCTION HOSE
Figure 1—DRAFTEX®, REELTEX®, and semirigid rubber-braided, wire-reinforced draft hose.
Table 1—Semirigid rubber-braided, wire-reinforced suction hose sizes and weights.
DRAFTEX® WOVEN FABRIC SUCTION HOSE
Table 2—DRAFTEX® performance.
REELTEX® WOVEN FABRIC SUCTION HOSE
REELTEX® is only available in lengths of 50 ft, necessitating recoupling for use in drafting operations of 8- or 10-ft lengths. Recoupling is time consuming and impractical, as the field does not have easy access to a manual expander or the preferred hydraulic expander. Consequently, it is impractical for the field to buy REELTEX® for use as a draft hose. See the San Dimas Technology and Development Center publication Hardline Hose Comparison Study Tech Tip regarding an evaluation of REELTEX® as a hardline hose for a w-in and 1-in reel hose application.
Table 3—REELTEX® performance.
All suction hose in this study was capable of holding a vacuum of 25 in of mercury, without any signs of collapse or other failures. All draft hose was capable of withstanding a minimum 200 psig hydrostatic proof pressure with no leaks from the threaded connection, cracks, breaks, permanent deformation, mechanical damage, or structural failure.
The bend radius test showed no indication of collapse or failure in the construction of the draft hose. Each hose was flexed five times through a 180-degree arc, starting at one end of the hose. The radius of the arc was six times the inside diameter of the hose.
All draft hose rubber or plastic components were evenly, fully formed; uniformly thick; and circular throughout. There were no blisters, pinholes, pits, sink marks, crazing, wrinkles, voids, foreign material, or cracks. The surface of the material was tack free. The fabric or wire-reinforcement did not protrude through the outer or inner surfaces but was completely embedded in the rubber or plastic material.
Abrasion resistance testing was conducted using the Factory Mutual (FM) abrasion test machine and test method (figure 2).
Abrasion testing was held after 40,000 cycles without failure, as was noted with the DRAFTEX® hose (figure 3).
Performance data for semirigid rubber-braided, wire-reinforced; DRAFTEX®; and REELTEX® draft hose is shown in table 4.
Table 4—Draft hose performance data comparison study.
Note: Manufacturer states that DRAFTEX® is capable of withstanding a minimum of 65,000 cycles on the FM abrasion test stand.
Table 5 —Draft hose cost comparison table.
REELTEX® draft hose is less than one-third the weight of semirigid rubber-braided, wire-reinforced draft hose. However, recoupling the hose in the field is impractical and makes it the most expensive draft hose in this study. Consequently, it is not recommended for use as a draft hose. Semirigid rubber-braided, wire-reinforced draft hose has 80 percent better abrasion resistance than REELTEX® and provides good support in drafting operations.
DRAFTEX¨ is available through Wildfire, a subsidiary of Tyco. For product inquiries contact Wildfire at 800–426–5207 or through http://www.wildfire-equipment.com. Wildfire is in the process of adding DRAFTEX® to the GSA Federal Supply Schedule 42, under GSA Contract Number GS-07F-5128A. The manufacturer of DRAFTEX®, Niedner Fire Hose, can be contacted at http://www.niedner.com.
For further information, please contact the SDTDC fire program leader at 909–599–1267.
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