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Product Selection
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Quality,
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There are several criteria that should be reviewed before making the proper selection: The proper swivel capacity should always be selected on the basis of the machine it will be used on. The swivel capacity should always equal or exceed the machine's capacity. This will ensure there is always a safety margin, no matter what is being pulled back. A swivel that is selected to suit pullback being done today will be insufficient for a pullback to be done tomorrow. If it is chosen based on the machine's capacity, it will always be sufficient for any job the machine can do. DCD offers two types of Pullback Swivels: The DUB-Swivel (00508 Series) is available in sizes from 2-1/2 Tons (5,000 lb.) to 80 Tons (160,000 lbs.) with a 5:1 Safety Factor, and from 110 Tons (220,000 lb.) to 700 Tons (1,400,000 lb.) with a 3:1 safety factor. They have a 3 stage sealing system and typically uses Spherical Roller or Tapered Roller bearings. They are available with a Clevis at both ends or, in sizes 30 Ton and larger, with an API Box end if preferred. Also available are several pin connections and also built-in models. The DUB-Lite swivel (00503 Series) is available in capacities from 8,500 lbs. to 45,000 lbs., is designed with a 3:1 Safety Factor, has a 3 stage sealing system and typically uses Angular Contact bearings. These swivels are available with Clevis ends, built-in features or with several special pin connections. The Box end configuration places a much higher side load on the swivel components and they are therefore more susceptible to damage. Often a contractor will prefer the Box end because it allows easier pushback if necessary. In our experience, about 75% of repairs are to Box end swivels and that illustrates the extra loading they must handle. The cost of the Box end type is also much greater since the Box end and the main shaft are machined from a single piece of steel. This explains the much higher cost. In some cases, the reamers being used already have a certain size or type of connection. This may dictate the swivel selection. Clevis width and pin diameters may be a consideration. In certain cases, a pullback may be made without the aid of a reamer. The duct being installed may be equal or smaller than the drilled hole. In these cases, the swivel outside diameter may be a consideration. For these applications, a DUB-Lite swivel is often the best selection. For quick recognition of a DCD Part Number the following is an explanation:
For all sizes and part numbers available, consult catalog or appropriate selection of the web site.
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