ISO 15749-1:2004

Overview

ISO 15749-1:2004 - Ships and marine technology: Sanitary drainage‑system design provides requirements and guidance for planning and designing sanitary drainage systems that evacuate wastewater from accommodation and commissary areas on ships and marine structures. Used together with ISO 15749‑2 to ISO 15749‑4, it covers gravity and vacuum drain piping, sewage disposal pipes and interfaces with treatment systems. The standard aligns with IMO/MARPOL environmental rules and excludes pipe systems carrying oily or chemically contaminated wastewater that could form flammable mixtures.

Key topics and requirements

• Scope and classification: Definitions for wastewater types (sewage vs grey water) and classification by origin to determine routing and treatment needs.
• Planning and system structure: Limits on number of sanitary units per line to ensure availability; guidance on gravity and vacuum system layouts, risers, manifolds and main sewers.
• Hydraulic and capacity data: Recommended minimum wastewater volumes per person/day (examples provided for passenger and non‑passenger ships) to size systems and treatment plants.
• Hygiene and environment: Mandatory separation of sewage and grey water lines for hygienic reasons; recommendations for mixing/equalization tanks ahead of treatment plants and measures to prevent discharges that contravene MARPOL Annex IV.
• Components and tanks: Requirements and roles for collector tanks, intermediate tanks, holding tanks, sludge storage and sewage treatment plants.
• Ventilation, odour and noise control: Design provisions to minimize odour nuisance and noise transmission (including ventilation and acoustic insulation).
• Testing and operation: System testing, commissioning and operation/maintenance considerations to maintain availability.
• Graphical symbols & documentation: Standardized symbols and simplified representations for ship drawings and piping diagrams.

Practical applications and users

ISO 15749‑1 is essential for:

• Shipbuilders, marine architects and naval engineers designing accommodation drainage
• Marine plumbing and HVAC designers specifying gravity or vacuum sanitary piping
• Shipyards and outfitting teams implementing collector tanks and sewage treatment interfaces
• Classification societies and regulatory authorities assessing compliance with MARPOL/IMO rules
• Operators specifying maintenance plans, testing and ventilation/odour control measures

Practical benefits include compliant sewage handling, reduced odour/noise complaints, predictable sizing of treatment and holding systems, and better operational availability.

Related standards

• ISO 15749‑2 to ISO 15749‑5 (gravity/vacuum piping, sewage disposal, deck and cargo drainage)
• IMO/MARPOL Annex IV and related MEPC/MSC guidance
• ISO 4067 (graphical symbols), ISO 14617 (diagram symbols) and other referenced ISO/IMO documents

Keywords: ISO 15749-1, sanitary drainage, ships, marine structures, drainage systems, sewage treatment, collector tank, vacuum system, gravity system, MARPOL.