scope:

This supplement contains changes to explain differences between rod percentages used in this bulletin and rod percentages shown in Table 4.1 of the third edition of RP11L: Recommended Practice for Design Calculations for Sucker Rod Pumping Systems, January 1977. Errata sheets issued November, 1973 remain in effect.

Page iii, Par. 6. Replace Par. 5 with the following:

9Rod and Pump Sizes. Rod and pump combinations listed in Table 1 were taken from Table 4.1 of the second edition of RP 11L, dated March 1972. Rod and pump combinations listed in Table 2 were not included in Table 4.1 of the second edition of RP 11L. Some of the larger size rods are not considered for shallow depth, low volume. Rod Nos. 88 and 99 were not considered in the computer program because it was assumed that untapered rods of 1 inch and larger would not normally be run.