Pipe strengths should be specified, as indicated in table below, to reduce the number of bid items and to simplify the administration of the project.

Recommended RCP Strength Specifications (Metric)

For D-loads (lb./ft./ft.) from...	...use	...or Equivalent Class
0 to 80	800	I
801 to 1,000	1,000	II
1001 to 1,350	1,350	III
1,351 to 2,000	2,000	IV
2001 to 3,000	3,000	V

Recommended RCP Strength Specifications (Metric)

For D-loads (N/m/mm) from…	…use	…or Equivalent Class
0 to 40	40.0	I
40.1 to 50.0	50.0	II
50.1 to 65.0	65.0	III
65.1 to 100.0	100.0	IV
100.1 to 140.0.	140.0	V

For some projects, it may be justified to indicate the actual computed D-load for bidding purposes without adhering to the suggested increments above. Generally, deviate from the suggested specification increments only when sufficient quantity of a pipe size warrants the special manufacturer of a specific D-load. Manufacturing conditions vary from company to company. Therefore, potential manufacturers should be contacted to confirm any suspected advantage.