ISO 15859-10:2004

Overview

ISO 15859-10:2004 - Space systems - Fluid characteristics, sampling and test methods - Part 10: Water - defines composition limits, sampling and test requirements for potable (Type P) and high‑purity demineralized/deionized water (Type HP) used in spacecraft and launch‑site operations. The standard applies to water used for cooling and servicing flight hardware and ground support equipment and sets verification rules to ensure water delivered at the flight‑vehicle interface meets agreed purity limits.

Key topics and requirements

• Scope and applicability: Covers only Type HP (high purity) and Type P (potable) influents within the specified limits; not applicable to other water types.
• Composition limits: Specifies limits for total solids, total organic carbon (TOC), ionic species and trace metals, sterility and organoleptic properties. Example limits included in the standard: total solids (Type HP 10 mg/L; Type P 100 mg/L) and TOC (Type P 1 mg/L). pH and other properties are specified for verification at 25 °C.
• Analytical parameters: Lists trace contaminants and ions to be monitored (cadmium, chromium(VI), copper, iron, lead, manganese, mercury, nickel, potassium, selenium, silver, zinc, iodine, chloride, etc.) and references accepted ISO test methods for each analyte.
• Sampling & test methods: Sampling must follow the ISO 5667 series (design, techniques, preservation and drinking‑water sampling). A sampling plan must define sampling points, procedures, frequency, sample size/number, test methods and responsibilities.
• Verification & rejection: Suppliers are typically responsible for sampling and verification. Non‑conforming samples require rejection and customer‑directed disposal.
• Referenced methods: The standard points to many established ISO test methods (e.g., ISO 7888 for conductivity, ISO 10523 for pH, ISO 7027 for turbidity, ISO 8245 for TOC, and several trace‑metal analysis standards).

Applications and who uses it

• Space agencies, launch providers and prime contractors for verifying water quality at the interface to launch vehicles and spacecraft.
• Ground support equipment and test facility operators responsible for cooling, servicing and potable water delivery to flight hardware.
• Environmental, quality and laboratory teams performing acceptance testing, incoming inspection and supplier qualification for fluids used in space systems.

Related standards

• Other parts of ISO 15859 (Parts 1–13) cover oxygen, hydrogen, nitrogen, propellants and breathing air.
• ISO 5667 series (water sampling) and multiple ISO methods for chemical and microbiological analysis cited within ISO 15859-10.

Keywords: ISO 15859-10, space systems water quality, potable water, high-purity water, water sampling, test methods, fluid composition limits, launch vehicle servicing.