The 2.5 x 21 Inch 1200 PSI Fiberglass Seawater RO Pressure Vessel is a critical
component for small boat watermaker systems, designed to house industry-standard 2.5" x 21" seawater reverse osmosis (SWRO) membranes. Its compact size, high-pressure rating
(1,200 psi), and durable fiberglass construction make it ideal for marine environments.
When paired with the Pumptec 107SS pump (sold separately), this vessel ensures
efficient desalination with minimal energy use. For boaters with sufficient space, adding
a second vessel can significantly boost water production, reduce system run-time, and
enhance electrical efficiency, making it a smart choice for extended voyages. Proudly
made in the USA, this pressure vessel guarantees top-quality performance for your DIY
watermaker.
Key Features
This pressure vessel is engineered for marine applications, offering a blend of durability,
efficiency, and ease of use:
• Durable Fiberglass Construction: Made from high-strength fiberglass reinforced
plastic (FRP) with machined duplex stainless steel end caps, it resists corrosion in
harsh seawater environments.
• High Pressure Rating: Rated at 1,200 psi, its ideal for the demanding pressures of
seawater reverse osmosis (SWRO).
• Compact Design: Measuring 2.5" in diameter and 21" in length, it fits seamlessly
into space-constrained small boats.
• Universal Compatibility: Designed for industry-standard 2.5" x 21" SWRO membranes
from brands like Applied Membranes, Inc. (AMI) and FilmTec.
• End Port Design: Features 1/4" FNPT ports for feed, brine, and permeate, simplifying
installation and maintenance.
• Marine-Grade Durability: Built to withstand constant exposure to saltwater and
vibration, ensuring long-term reliability.
Why Choose This Pressure Vessel?
Small boat owners face unique challenges: limited space, restricted power, and the need
for reliable equipment. This pressure vessel addresses these needs with:
• Space-Saving Design: Its compact 2.5" x 21" size fits easily into tight onboard
spaces, perfect for smaller vessels.
• Reliable Performance: Ensures your RO membrane operates under optimal conditions,
maximizing fresh water production.
• Low Maintenance: Durable materials and a simple design reduce upkeep, saving
time and costs.
• Versatile Compatibility: Works with a wide range of 2.5" x 21" SWRO membranes,
offering flexibility in system design.
• Durability: Fiberglass construction and stainless steel end caps withstand harsh
marine conditions for years of reliable use.
• Made in the USA: Proudly manufactured in Vista, California, at Applied Membranes,
Inc.’s state-of-the-art facility, ensuring the highest quality and reliability with
ISO 9001:2015 and NSF certifications.
Technical Specifications
The pressure vessel is built for performance and reliability. Here are its key specifications:
Specification Details
Diameter 2.5 inches
Length 21 inches
Pressure Rating 1,200 psi
Material Fiberglass (FRP) with duplex stainless steel end caps
Ports Feed: 1/4" FNPT, Brine: 1/4" FNPT, Permeate: 1/4" FNPT
Compatibility 2.5" x 21" SWRO membranes (e.g., AMI, FilmTec)
Role in Your Watermaker System
This pressure vessel is a critical component of a watermaker system, designed to house
the reverse osmosis (RO) membrane that filters seawater into fresh water. It works by:
• Containing the Membrane: Provides a secure, leak-free environment for the RO
membrane.
• Withstanding High Pressure: Handles up to 1,200 psi to ensure efficient desalination.
• Ensuring Compatibility: Fits standard 2.5" x 21" SWRO membranes for easy integration.
When paired with a high-pressure pump like the Pumptec 107SS (sold separately on
our website), it forms a complete, efficient watermaker system tailored for small boats
Maximize Efficiency with Dual Vessels
For customers using the Pumptec 107SS pump, adding a second 2.5 x 21 Inch
1200 PSI Fiberglass Seawater RO Pressure Vessel can significantly enhance your
watermaker systems performance. By installing two vessels in parallel, you can:
• Increase Water Production: Double the daily output (e.g., from approximately
200 gallons per day to 400 gallons per day with standard membranes), meeting higher
water demands for drinking, cooking, or showering.
• Reduce Run-Time: Produce more water in less time, minimizing the systems operational
hours and extending component lifespan.
• Boost Electrical Efficiency: Shorter run-times reduce energy consumption, ideal
for small boats with limited power, especially when paired with the energy-efficient
Pumptec 107SS pump, which supports solar power via its 12V option.
If your boat has sufficient space, adding a second vessel is a cost-effective way to optimize
your desalination system, making it perfect for longer voyages or larger crews. Contact us to discuss whether dual vessels are right for your setup!
Energy-Efficient Desalination with the Pumptec
107SS
For optimal performance, pair this pressure vessel with the Pumptec 107SS pump, the
most efficient high-pressure, low-volume pump on the market. The 107SS delivers the precise pressure needed for seawater reverse osmosis while minimizing energy consumption,
making it ideal for small boats with limited power resources. Its 12V version can be
powered by solar panels, offering a sustainable, off-grid desalination solution. While the
pump is sold separately, this combination creates a powerful, energy-efficient watermaker
system that's perfect for eco-conscious boaters.
Understanding Reverse Osmosis
Reverse osmosis (RO) is a water purification process that uses a semi-permeable membrane to remove salt, impurities, and contaminants from seawater, producing fresh, drinkable water. The pressure vessel plays a vital role by:
• Housing the RO membrane securely.
• Maintaining the high pressure (up to 1,200 psi) needed to force water through the
membrane.
• Ensuring efficient water production with minimal leaks or failures.
This makes the pressure vessel an essential component for any marine watermaker system.
Installation and Maintenance Tips
To get the most out of your pressure vessel:
• Secure Mounting: Use the optional clamp brackets to prevent movement during
operation.
• Check Seals: When replacing membranes, inspect O-rings and end caps for wear to avoid leaks.
• Flush the System: After each use, flush with fresh water to prevent salt buildup.
• Follow Guidelines: Replace membranes, usually every 2-3 years, depending on usage and performance. Adhere to the membrane manufacturer's recommendations.
Why Small Boat Owners Love This Pressure Vessel
This pressure vessel is tailored for small boat owners who need a reliable, space-saving
desalination solution:• Compact Fit: Perfect for tight spaces on smaller vessels.
• Energy Efficiency: When paired with the Pumptec 107SS, it supports low-power,
solar-compatible systems.
• Durability: Built to withstand saltwater and vibration for long-term use.
• Ease of Use: Simplifies installation and maintenance, letting you focus on your
journey.
Frequently Asked Questions
• What is this pressure vessel? A fiberglass vessel that houses 2.5" x 21" SWRO
membranes for marine watermakers.
• What membranes are compatible? It fits industry-standard 2.5" x 21" SWRO
membranes from brands like AMI and FilmTec.
• What are the port sizes? All ports (feed, brine, permeate) are 1/4" FNPT for easy
connection.