Division 33 Utilities
Performance Specification Gap in Division 33 Utilities submittals
Short answer
A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires. Default grade in Division 33 Utilities: Blocker.
A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires. This guide covers how it shows up specifically in Division 33 Utilities submittals.
What to look for in Division 33 Utilities
Key performance parameters in utility submittals:
- Water pipe pressure class and material:
- Ductile iron pipe (DIP): Class 52 is minimum for most water mains; verify class vs working pressure + surge; AWWA C151
- PVC pressure pipe: C900 (4-12") or C905 (14"+), pressure class 150, 200, or 235; lower class than spec is a blocker
- HDPE water main: DR (dimension ratio) rating determines pressure rating; DR 11 = 160 psi, DR 13.5 = 128 psi
- Sewer pipe SDR (standard dimension ratio):
- PVC gravity sewer: SDR 26 (pipe stiffness 115 psi per ASTM D2412) or SDR 35 (pipe stiffness 46 psi); SDR 35 is weaker and only acceptable at shallower depths
- Specify which SDR is required and verify submitted product matches
- Reinforced concrete pipe (RCP) class:
- Classes III, IV, and V correspond to increasing wall thickness and 3-edge bearing strength
- Class III is minimum for most culverts; higher traffic or deeper burial requires Class IV or V
- Storm HDPE pipe corrugation profile - affects ring stiffness (ADS N-12 SB vs HP Storm); spec may require smooth interior for hydraulic capacity
- Manhole wall thickness and reinforcing per ASTM C478 for 48" diameter; custom sizes require engineered drawings
- Trench backfill compaction requirement (% of ASTM D1557 Proctor) - typically 95% in paved areas, 90% in unpaved; lower compaction causes pavement settlement
- Pipe bedding gradation (Class B, C, or D per ASTM D2321) - affects pipe deflection under load
- Hydraulic capacity - Manning's n coefficient and pipe internal diameter must match hydraulic design; smooth interior HDPE has n = 0.012, corrugated has n = 0.024
- Fire hydrant rated working pressure and flow test GPM - must match fire flow design
- Gate valve Cv (flow coefficient) and operating pressure rating vs system design
How severe is it?
Default grade: Blocker. Always a Blocker when the gap touches life-safety or structural performance.
Deviation Check assigns a default per category and escalates or de-escalates based on the spec, always showing its reasoning. See the Division 33 severity rules.
What the PM should do
Treat this as a hold. Do not approve the submittal until the sub resolves it, either by providing the specified product and documentation or by routing an approved substitution or or-equal request. Return the relevant spec passage to the sub as a redline.
Other deviation categories in Division 33
Frequently asked questions
What pressure class and standard should a ductile iron pipe submittal reference for a Division 33 Utilities water main?
Class 52 is the minimum for most water mains under AWWA C151. The review must confirm the submitted class covers working pressure plus surge, not just static pressure. A lower class - even Class 51 - is a blocker because the wall thickness calculation must account for surge loading, and that verification cannot happen without the correct class on record.
Why does an SDR 35 PVC gravity sewer pipe submittal sometimes fail the performance check in Division 33 Utilities?
SDR 35 has a pipe stiffness of only 46 psi per ASTM D2412, versus 115 psi for SDR 26. At deeper burial depths or under heavy surcharge loads, SDR 35 deflects more than the allowable limit. If the spec requires SDR 26 and the submittal shows SDR 35, it is a blocker - the weaker wall is only acceptable at shallower depths where the spec explicitly allows it.
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