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208   SHALE SHAKERS AND DRILLING FLUID SYSTEMS



          This classification system uses the letters "IP"    solid foreign bodies (tools, wires, etc.) from intrud-
        followed by two digits (Table 12-5). The first digit  ing into an enclosure. The second digit of the code
        of the code indicates the degree that persons are     indicates the degree of protection to the equip-
        protected against contact with moving parts, and      ment from moisture entry by various means such
        the degree that equipment is protected against        as dripping, spraying, or immersion (Figure 12-3).






                           TABLE 12-5. Scope and Protection According to IP Protection Classes

                          (If a code character is not necessary, it should be replaced by the letter "X.")
          Digit                     First Digit                                              Second Digit
        Protectk                    (Physical)                Foreign Body                     (Water)

            0                    no protection               no protection               no protection
            I                    protection against          protection against          protection against
                                 back and body               solid foreign               water-drops falling
                                 contact                     bodies, 50 mm               vertically
                                                             (2.08 in) diameter
            2                    finger contact              solid foreign               water-drops falling
                                 bodies, 12.5 mm             15° from vertical
                                                             (0.52 in.) diameter
            3                    tool contact                solid foreign               water spray at angles
                                 bodies 2.5 mm               up to 60°
                                                             (0.1 in.) diameter
            4                    wire contact                solid foreign               water spray from all
                                 bodies 1.0 mm               directions
                                                             (0.04 in.) diameter
            5                    wire contact                dust                        water jets
            6                    wire contact                dust-tight                  strong water jets
            7                                                                            intermittent immersion
                                                             in water
            8                                                                            continuous immersion
                                                                                         in water
                           First Digit (O-6)
                         Contact and Foreign    Second Digit (O-8)    Additional Letter   Supplemental Letter
        Code Letters       Body Protection       Water Protection        (optional)            (optional)
        IP                        5                     4                    C                       S
        Additional letters concern personnel protection against access to dangerous parts as follows:
               by back of hand                 "A"
               by finger                       "B"
               by tools                        "C"
               by wire                         "D"
        Supplemental letters concern equipment protection as follows:
               for high voltage equipment      "H"
               waterproof during operation     "M"
               waterproof during standstill    "S"
               weather conditions              "W"
        If more than one supplemental letter is required, they should be listed in alphabetical order.
        Example: "IP 66/IP 67 CS"
        Personnel are protected against contact with a wire. Equipment enclosure is dust-tight. The equipment is protected
        against spray from strong water jets and also intermittent immersion in water. Protection is designed for persons
        using tools 2.5 mm diameter and 100 mm long (0.2 in. x 4 in.). Water testing was performed while equipment was
        at standstill (not operating).
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