John, it's interesting that the URL that you provide as backing up your use of schedule 40 rigid PVC specifically recommends against using it. They say that if any rigid PVC is used it should be schedule 80. But they do not recommend any rigid PVC for sewage systems.
Quote:
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We recommend against the use of hard pipe altogether, but If you must--use only schedule 80 or ABS, and "soft-couple" (use hose) all connections to installed devices to reduce stress and shock that can result not only in cracked pipe, but damaged fittings and equipment.
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I just reread your last post and see that you are using sched 80. Better but still not recommended.
Deep