Specifying O'let, the Schedule of both the Run and Branch
Generally the schedules of the run pipe and branch pipe are identical and thus specification of the equivalent schedule Weldolet assures the proper fitting being used.
Example..
16" Standard weight x 6" Standard weight is specified as a 6" standard weight fitting.
Where the schedule of the run is greater or less than the schedule of the branch, it is essential that both schedules be specified since (a) The Weldolet's reinforcing characteristics are a function of the run pipe wall thickness, which in turn designates the schedule of the basic Weldolet® fitting to be used;(b) The wall thickness of the outlet or branch end must match the wall thickness of the branch pipe.
Example..
16" Extra strong x 6" Standard weight
16" Standard weight x 6" Extra strong
Special care is suggested to avoid confusing schedule 40 and standard weight as being identical (above 10" schedule 40 is heavier) and schedule 80 and extra strong (above 8" schedule 80 is heavier).
Example..
8" Schedule 80 x 4" Schedule 80 fitting or extra strong fitting.18" Schedule 80 x 4" Schedule 80 is a considerably heavier fitting, because the reinforcement is for 18" schedule 80 pipe with a wall thickness of approximately 1".
The Weldolet® is available in standard code designs for all combinations of run wall thicknesses up through 3.1/2" thickness and branch wall thicknesses up through double extra strong. Designs for thicknesses greater than these can be developed on request.
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