SeaGuardian® Iodine Hydrotest Solution
A marine-safe, long-duration preservation blend formulated for hydrotesting and lay-up protection of subsea and topside piping systems.
Product Overview
SeaGuardian® Iodine Hydrotest Solution is a marine-safe, long-duration preservation blend formulated for hydrotesting and lay-up protection of subsea and topside piping systems. It combines a slow-release iodine biocide, a high-efficiency oxygen scavenger, and a robust corrosion inhibitor to deliver stable protection over extended durations. The inclusion of a fluorescent dye assists with leak detection and visual tracking. When dosed at 500 ppm, SeaGuardian® Iodine Hydrotest Solution provides effective microbial, oxidation, and corrosion control for up to 24 months in clean, closed hydrotest systems.
This formulation is specifically engineered to take advantage of iodine’s biocidal properties while ensuring superior subsea environmental compatibility. Unlike commonly used alternatives, the iodine complex in this product is stabilized and released in a controlled manner, significantly reducing environmental impact upon dilution and discharge into the marine environment.
Environmental Comparison to Quaternary Ammonium Biocides
Compared to typical quaternary ammonium biocides (QACs) currently used for long-term hydrotest preservation, SeaGuardian® Iodine Hydrotest offers significantly reduced environmental toxicity.
QACs exhibit LC50 values in the range of 0.01–0.1 mg/L for sensitive aquatic species (algae, invertebrates), with high persistence and bioaccumulation potential.
SeaGuardian® iodine-based system (PVP-Iodine) has LC50 values typically >1 mg/L and degrades rapidly to iodide/iodate forms naturally present in seawater.
Iodine systems show low environmental persistence and minimal impact on marine microbial and planktonic populations.
Estimated Environmental Impact Reduction
SeaGuardian® Iodine Hydrotest is expected to reduce marine aquatic toxicity by 90+% compared to equivalent QAC-based biocides over the same comparative chemical strength preservation period. This profile supports improved compliance with CEFAS, CHARM, and MARPOL discharge regulations and reduces long-term ecological burden during subsea discharge of hydrotest fluids.
Applications
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Subsea pipeline hydrotesting
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Topside piping lay-up and preservation
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Long-term equipment storage
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Leak detection during pressure testing
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Offshore and environmentally sensitive locations
Features & Benefits
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Effective at low dose (250–500 ppm)
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Long-term protection – up to 2 years at 500 ppm
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Marine discharge compliant – biodegradable, non-toxic
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Three-part protection system:
- Iodine Biocide: Slow-release antimicrobial action effective against bacteria and fungi
- Oxygen Scavenger: Rapid removal of dissolved oxygen to <10 ppb
- Corrosion Inhibitor: Multi-metal film-forming inhibitor suitable for CS, SS and coated lines
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Includes fluorescent tracer dye for leak and coverage verification
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Compatible with most elastomers, gaskets, and coatings
Recommended Dilution & Use
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Typical Dose: 250–500 ppm (0.25–0.5 L per 1000 L of system volume)
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Add directly to fill water and circulate or mix before filling
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Verify concentration via iodine or dye tracer as required
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For preservation periods beyond 12 months, 500 ppm is recommended
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Maintain system integrity to minimize oxygen ingress and external contamination
Physical Properties
Appearance: Amber liquid
Odour: Mild / iodine
pH (1% solution): 6.5–7.5
Specific Gravity: 1.03–1.05
Solubility: Completely soluble in water
Flash Point: Non-flammable
Regulatory & Environmental
Readily biodegradable under OECD 301 - Non-toxic to marine organisms at recommended use concentrations - Designed for MARPOL and offshore discharge compliance - Non-volatile, non-flammable, and safe for transport - Suitable for use in environmentally sensitive areas
Storage & Handling
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Store in cool, shaded conditions below 40°C
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Avoid contact with strong oxidizers and acids
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Shelf life: 18 months in sealed original packaging
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Use standard PPE when handling concentrate