Tank blanketing valves

Tank blanketing, also referred to as tank padding or make up, is the process of applying blanket of an inert gas (nitrogen) in the vapour space above the liquid in a closed storage tank. The inert gas is supplied at a required pressure during pump off or thermal contraction events to prevent air and moisture from entering the tank and thus reduce oxygen content in the vapour space. Other common names for N2 Blanketing valves are inert gas blanketing valves and low pressure reducing valves.

Ramén Valves offers high-quality tank blanketing valves from the American manufacturer Cashco Inc. Feel free to contact us today and we will help you develop an optimal solution for your needs. You can also book a meeting with one of our technical specialists.

The purpose of using tank blanketing valves

The purpose of tank blanketing is to maintain a specific atmosphere or pressure inside the tank to ensure safety, stability or prevent unwanted chemical reactions. The inert gas counteracts the negative effects that oxygen has on the contents of the tank. For example, food in a tank can be oxidized and contaminated by oxygen.

The presence of oxygen in a tank can also, when handling certain flammable substances, create very dangerous situations. Tank blanketing then helps to better control and prevent fires by diluting the oxygen content in the vapor space within the flammable area. Using tank blanketing also limits product evaporation in the tank space, which makes it a cost-saving and environmentally smart solution. Tank blanketing valves are sometimes also called low pressure reducing valves.


These are some of the most important benefits of using tank blanketing valves.

  • Protect life by protecting tank.

  • Control and prevent fire by diluting oxygen content of the vapour space below the flammable range.

  • Provide corrosion protection (product integrity) by reducing oxygen content in the vapour space.

  • Protect food from oxidation, contamination by preventing air and moisture from entering the tank.

  • Limit product evaporation (environmentally friendly) by maintaining the proper atmosphere and pressure on the product stored in a tank.

  • Work as primary vacuum relief for the storage tank by supplying gas to the vapour space when pressure decreases below the valves set point.

Areas of usage

Tank blanketing is an important technique to ensure the safety and stability of various industrial processes and applications by controlling the atmosphere in tanks and containers. Some common uses for tank blanketing are mentioned below.

Fire protection: By keeping a container or tank filled with an inert gas, you reduce the risk of oxygen exposure, which in turn reduces the risk of fire and explosion. The gas space in a flammable material storage tank contains a mixture of air and vapor from the flammable material. This mixture can ignite if it is within the flammability limits of the solvent. An blanketing system reduces the likelihood of combustion of flammable materials stored in a confined space, particularly a fuel tank.

Chemical processes: In the chemical industry, tank blanketing is used to control the atmosphere in reactors and storage tanks. It helps prevent unwanted chemical reactions or breakdown of chemical compounds.

The food and beverage industry: In the food and beverage industry, tank blanketing is used to extend the shelf life of products by reducing oxidation and thereby preserving the quality of the products.

Oil and gas industry: Prevents the formation of explosive mixtures in oil and gas storage tanks by replacing oxygen with an inert gas.

Transport of hazardous substances: Tank blanketing is also used during the transport of hazardous substances to reduce the risk of accidents by maintaining a stable atmosphere in transport containers.

How storage tanks can be made inert 

Storage tanks can be made inert by: 

  • Reducing the oxygen content of the vapour space i.e. limiting oxygen concentration below which combustion is not possible, independent of the concentration of fuel.

  • Reducing the fuel concentration (lower explosive limit ‐ LEL – too lean to burn)

  • Increasing fuel concentration (upper explosive limit UEL – too rich to burn)

Codes and standards

Storage tank blanketing are recognized by the following government regulations and industrial standards:

  • API Standard 2000 (Venting Atmospheric and Low‐pressure Storage Tanks)

  • ISO 28300 (Petroleum, petrochemical and natural gas industries)

  • EPA (Environmental Protection Agency)

  • NFPA 69 (Standard on Explosion Prevention)

  • OSHA Part 1910.110 (Storage and Handling of Liquefied Petroleum Gases)

Our tank blanketing valves

Some of our tank blanketing valves from Cashco Inc. are described below. Feel free to contact us for more information or a quote. We help you find a solution that suits your process.

Tank inerting valve 1078

The Model 1078 Vacu-Gard is a pilot-operated valve, specifically designed to reduce blanketing gas losses on low pressure storage tanks. It opens and closes automatically as required, due to emptying of tank and thermal inbreathing, to maintain a closely controlled gas blanket pressure allowing tank pressures to be controlled at much tighter tolerances than with standard regulator. It is intended for installation on top of the medium or large storage tanks. The simple design increases reliability and lowers maintenance cost. With multiple body materials, soft good seals and the performance that is unmatched in the industry, the Model 1078 is the clear choice.

Read more in the product data sheet.
Read more inte the product IOM.

Tank inerting valve 1088

The Model 1088 from Cashco is a compact valve specially designed for applications with smaller tanks. The valve opens and closes automatically to maintain a carefully controlled pressure of the nitrogen blanket. The Model 1088 can be set from vacuum tight to 14 psig/1barg, making it a versatile product suitable for most applications. At the set pressure, the valve is bubble-tight, which prevents leakage of the added nitrogen gas. Service and membrane replacement can be carried out without disassembling the valve from the tank. Even in the standard version, the valve material provides added corrosion resistance at no additional cost, which extends the life of the valve. The simple design increases reliability and lowers maintenance cost.

Read more in the product data sheet.
Read more inte the product IOM.

Flanged connection pipe for tank blanketing valves - model 2049

Model 2049 from Cashco is an accessory for tank blanketing valves that allows the installation of multiple components even though only one connection point is available.

Read more in the product data sheet.
Read more inte the product IOM.

Tank blanketing valves
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