PLUMBING SERVICES
Plumbing Calculations
Fixture unit, pipe sizing, and demand calculation support that gives your engineers a reliable foundation for every
plumbing system.
Our Founding and Mission
Introduction
Accurate plumbing calculations underpin every system covered elsewhere in our plumbing service offering — domestic water pipe sizing, sanitary and vent sizing, storm drainage capacity, and gas pipe sizing all depend on calculation work performed correctly and documented clearly. NexMEP Global LLC provides plumbing calculation support to U.S. MEP consulting firms, preparing fixture unit compilations, pipe sizing worksheets, and demand calculations using the fixture counts, code basis, and design parameters your engineering team provides.
Our role is to produce complete, well-documented calculation packages that your engineers review and approve before they become the basis for pipe sizing shown on the drawings. We do not select design parameters independently; every fixture unit value, demand factor, and sizing assumption we use is sourced from your team’s design documentation or the applicable code table your engineer directs us to apply.
DESIGN ACCURACY & COMPLIANCE
Why This Service Matters
Plumbing calculations determine pipe sizes throughout a building, and an error at this stage propagates into every downstream drawing and schedule that references it. Because plumbing code sizing methodology involves multiple lookup tables, demand factors, and system-specific adjustments, this calculation work is detail-intensive and benefits from a dedicated, consistent approach applied uniformly across every system on a project.
Centralizing plumbing calculation production allows your engineers to review a single, well-organized calculation package for the entire plumbing scope rather than assembling and cross-checking calculations prepared inconsistently across different systems or team members, and keeps calculation methodology consistent as a project moves from schematic design through construction documents.
Our Capabilities
Fixture Unit Compilations
Detailed WSFU and DFU compilations for domestic water, sanitary, and vent systems.
Pipe Sizing Worksheets
Standardized pipe sizing calculation reports adhering strictly to applicable plumbing codes.
Gas Load Calculations
Natural gas connected appliance demand tabulations and distribution pipe sizing.
Storm Drainage Sizing
Hydraulic capacity and leader sizing calculations based on design rainfall intensity.
Comparative Trade Studies
Comparative calculations evaluating alternate pipe materials, sizing paths, and fixture layouts.
Phase-Based Calculations
Scalable calculation support spanning schematic estimation through final CD packages.
Calculations
Engineering Calculations
Calculation methodology built for accurate, traceable HVAC equipment sizing.
Sizing Methodology & Code Alignment
Jurisdiction-specific plumbing code sizing calculations for water, drainage, vent, gas, and storm systems.
System Cross-Referencing & Backup
System-by-system calculation packages with summary tables cross-referenced to risers and schedules.
Calculations
Systems We Support
Ventilation-related calculation support includes outdoor air rate compilation.
Domestic Water Distribution
WSFU demand calculations, pipe velocity checks, and pressure losses.
Sanitary & Vent Piping
DFU load aggregations and code-compliant vent stack sizing.
Storm Drainage Networks
Rainfall intensity capacity studies for primary and secondary systems.
Natural Gas Piping
Fuel gas appliance demand, length factors, and distribution pipe sizing.
Specialty Medical Gas
Diversified demand calculations for healthcare and clinical systems.
Local Code Adaptations
Jurisdiction-specific methodology adjusted for state and local amendments.
Our calculation capabilities encompass all core plumbing scopes, guaranteeing methodologically sound, code-compliant data for every system type.
Calculations
Software, Workflow & Coordination
Rigorous backup calculations formatted directly for permit submission and QA/QC documentation.
Software & Production Workflow
Calculations are prepared using industry-standard tools and software compatible with your firm's standards. We coordinate directly with project fixture counts and schedules, proactively flagging data gaps prior to finalization.
Revit & AutoCAD Coordination
When BIM is utilized, fixture counts are extracted directly from Revit models to eliminate discrepancies between calculations and drawings. Any design changes trigger instant calculation re-runs, with resulting pipe size updates flagged for engineering review.
Calculations
Systems We Support
Expertise across diverse equipment lines, hybrid configurations, and complex Electrical setups.
Fixture Unit Reports
Pipe Sizing Worksheets
Gas & Storm Backup
Input Assumption Sheets
Need Reliable Plumbing Calculation Support?
Partner with NexMEP Global LLC for transparent, code-accurate pipe sizing and fixture unit packages.
Our Core Philosophy
Typical Project Types
Commercial & Office
Corporate offices, commercial developments, and tenant improvements.
Multi-Family Residential
Multi-family complexes with representative unit prototype structures.
Education & Healthcare
K-12 facilities, higher education campuses, hospitals, and outpatient clinics.
Hospitality & Industrial
Hotels, retail centers, restaurants, and light industrial developments.
Calculations
QA/QC Process
A rigorous, multi-tiered review structure ensuring accurate, clear, and error-free submittals.
Input Data Audits
Verifying calculation inputs against source fixture counts and equipment schedules.
Code Application Reviews
Auditing worksheet logic and pipe sizes against code lookup tables and riser plans.
Independent Spot-Checks
Secondary reviewers performing independent mathematical spot-checks before release.
Why NexMEP Global LLC?
NexMEP Global LLC brings a dedicated production team with practical experience across standard and specialty ventilation systems, a consistent U.S. code and standards focus, and a multi-level QA/QC process that reduces rework during your engineer’s review cycle.