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'mm/km • kN load sucker rod string. Maximum design stress for sucker rods is between 30,000 and 40,000 lb/in2 (207 and 276 MPa), depending on the metallurgy of the rod and the corrosive environment of the well. Useful data for designing sucker rod strings are shown in Table 2.

TABLE 3 Maximum rating of standard pumping units

Stroke length, Structure capacity,

TABLE 3 Maximum rating of standard pumping units

Stroke length, Structure capacity,

Torque, in • lb (N • m)

in (m)

lb (kN)

Design spm"

6,400 (8,677)

16 (0.406)

3,200 (14.23)

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