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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).