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Tank Blanketing: A Versatile Tool for Tank Protection This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed.

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Presentation on theme: "Tank Blanketing: A Versatile Tool for Tank Protection This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed."— Presentation transcript:

1 Tank Blanketing: A Versatile Tool for Tank Protection This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

2 Tank Blanketing is the process of applying an inert gas to the vapor space of a storage tank, vessel or container. Tank blanketing is also referred to as tank padding. To protect the product in the tank from oxidation (limits degradation or spoiling of the product) Protect the inside of the tank from oxidizing / rusting Limit product evaporation Reduce the possibility of an explosive vapor in the tank Effectively control volatile organic compounds (VOCs) emitted to the atmosphere. WHY USE TANK BLANKETING? This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

3 HOW DOES A BLANKETING VALVE WORK? HOW IS THIS DONE? By preventing air, moisture and other contaminants from getting in the tank The Blanketing Valve works by delivering an inert gas into the tank during tank in-breathing. This gas is also called a make-up gas. The inert gas is delivered into the tank only during tank inbreathing cycles. In-breathing occurs when liquid is being pumped from the tank, and/or when vapors condense in the tank due to a decrease in temperature causing a vacuum in the tank. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

4 HOW DOES A BLANKETING VALVE WORK? THE MOST COMMON INERT GASES USED IN BLANKETING ARE: Nitrogen Carbon Dioxide Other gases which are also used: Natural Gas Argon This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

5 Depending upon the specific application, the selection of the inerting gas is often based upon one or more of the following characteristics: NON-FLAMMABILITY NON-CONTAMINATING CHEMICALLY COMPATIBLE NON-TOXIC COST AVAILABILITY HOW DOES A BLANKETING VALVE WORK? This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

6 WHAT ARE THE BENEFITS OF TANK BLANKETING? -Protect the product in the tank from oxidizing Limits product sp oilage & Ensures quality feedstock for production process -Limit product evaporation from the tank Increases profitability Eliminates air in the tank and therefore reduces the possibility of a fire -Reduce the possibility of an explosive vapor in the tank -Effectively control volatile organic compounds (VOCs) emitted to the atmosphere Gets EPA of your back -Protect the inside of the tank from oxidizing / rusting Do not have to replace the tank This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

7 Tank blanketing valves are used in wide variety of liquid processing and storage tank applications which include: Petroleum Refineries Chemical Process Facilities Vapor Recovery Systems Bulk Liquid Storage Terminals Food / Pharmaceutical Plants Digester Systems Semiconductor Industry This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

8 Blanketing Valve A device that senses the pressure in the vapor space of a storage tank and controls the flow of an inert gas (usually Nitrogen) into the vapor space so that the tank pressure can be maintained within an acceptable range. Deadband The total pressure difference between the blanketing valve opening pressure (or set point) and resealing pressure. This applies to the main valve. Some minor leakage through the pilot will occur above the main valve resealing pressure. Dome Pressure In a pilot operated blanketing valve, the pressure in the dome volume. Dome Volume In a pilot operated blanketing valve, the chamber between the poppet in the pilot valve and the piston in the main valve. Flow Plug A small cylinder which may be installed in the valve to partially block the flow of inert gas through the valve. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

9 Main Valve The portion of the valve through which the supply gas flows into the storage tank. Pilot Valve In a pilot operated valve, the portion of the valve that senses tank pressure and controls the opening and closing of the main valve. Poppet The component in the valve which moves in response to changes in pressure in the sensing diaphragm chamber and which, when unseated, allows flow through the device. Pressure Balanced Poppet A poppet designed so that the supply pressure will not have an effect on its opening or closing characteristics. All Protectoseal blanketing vales have pressure balanced poppets. Sense Chamber The space below the diaphragm chamber to which the sense line pressure, from the tank, is directed. The pressure in the sense chamber controls the opening and closing of the poppet. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

10 Sense Diaphragm A thin, non-metallic disc in the diaphragm chamber which flexes in response to changes in the sense line pressure Sense Line A tube running from the tanks vapor space to the sense port of the blanketing valve. This tube transmits tank pressure to the sense chamber. Set Point The pressure at which the main valve opens and flows. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

11 PROTECTOSEAL MANUFACTURES TWO TYPES OF BLANKETING VALVES F20T Pilot Operated, 1 inch F30B Direct Acting, 1/2 inch This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

12 SERIES 20 Designed specifically for tank blanketing Accommodates inlet gas pressures from 20 PSIG to 200 PSIG Pilot operated design provides very tight operating band 1 NPT inlet and outlet standard Compact, light-weight design Optional inlet and outlet connections available Set points from –0.5 WC to 69.2 WC Optional flow plugs to meet specific flow requirements Fully field serviceable Delivers up to 83,108 SCFH of N2 This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

13 F20T PILOT OPERATED BLANKETING VALVES Consists of two separate valves operating in tandem, the pilot valve and the main valve. The pilot valve senses the tank pressure which causes the pilot valve to open and to close which then controls the opening and closing of the main valve. When the main valve opens it allows the flow of the blanketing gas through the valve from the supply source into the tank. The pilot valve will open and close gradually (movement is small). Series 20 in open position The pilot valve movement is controlled by a flexible diaphragm which is spring loaded on one side and the tank pressure on the other. The main valve will open and close quickly responding to changes in dome pressure which is controlled by the pilot valve. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

14 Pilot Operated Design Pressure Sense Chamber (C) Controls the opening and closing of the valve Vertical Moving Poppet (D) Movement causes valve to open and close Piston (E) Movement controls the inert gas flow This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

15 Blanketing Valve Operating Ranges Emergency Vent Full Open Emergency Vent Set Point Pressure Vent Fully Open Pressure Vent Set Point Blanketing Valve Closed Blanketing Valve Open Vacuum Vent Set Point Vacuum Vent Fully Open Blanketing Valve Set Point Deadband This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

16 BLANKETING VALVE OPERATING CYCLE Pilot Valve Seals Pilot Valve Cracks Main Valve Seals Main Valve Opens TANK PRESSURE DEADBAND This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

17 SERIES 30 Designed specifically for tank blanketing Set points from -0.1 WC to 69.2 WC Compact, light-weight design Optional flanged or threaded connections available 1/2 NPT inlet and outlet standard Accommodates inlet gas pressures from 10 PSIG to 200 PSIG Optional flow plugs to meet specific flow requirements Fully field serviceable Delivers up to 2,170 SCFH of N2 This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

18 F30B DIRECT ACTING BLANKETING VALVES A valve assembly connected to a flexible diaphragm, similar to a pilot valve, moves up and down gradually responding to tank pressure. As the valve moves away from its seated position, flow through from the blanketing gas supply source begins. Direct acting valves tend to have considerable more droop than pilot operated valves. Droop is defined as the amount of pressure drop below the set point required to cause the gas blanketing valve to open. Series 30 in open position This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

19 Direct Acting Design Pressure Sense Chamber (D) Controls the opening and closing of the valve Vertical Moving Poppet (B) Movement causes valve to open and close This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

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21 A TYPICAL TANK BLANKETING INSTALLATION Make sure that the setting of the vents is between 2 WC and 8 WC higher than the blanketing system set point. This insures that the vents do not end up being held open by the blanketing systems operation. Vacuum Vent set point should be 0.5 WC below the blanketing system for the F20T and 1.5 WC below for the F30B. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

22 Inert Gas Supply Line Feeds the tanks voided vapor space Sensing Line Senses any changes in internal tank pressure and tells the main valve to either open or close It is important that the sense line and the blanketing valves outlet pipe are far enough apart to ensure the static pressure in the tank is sensed. These lines are usually 2 to 10 feet apart This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

23 INSTALLATION: The blanketing valve is connected to the top of the tank and the inert gas is piped from a supply source to the inlet connection of the valve. A sensing line from a remote location on the tank is connected to the sensing port of the valve. The sense line connection to the tank should not exceed ten feet in length from the blanketing valve connection. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

24 A filter upstream of the blanketing valve is suggested to guarantee a clean supply of gas to the valve. Use of plumbers tape to connect the gas supply line to the blanketing valve is recommended. Do not use pipe dope. Pipe dope can become loose in the pipe and find its way into the blanketing valve and cause the valve to fail open. If a filter is utilized the flow through the filter must be greater than the required vacuum flow. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

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26 Vacuum relief requirements are based on two factors: Maximum Liquid Movement out of the tank or the emptying or pump-out rate Thermal effect or atmospheric cooling This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

27 EXAMPLE – Blanketing Valve* 1.Tank Capacity………………………………………. 2.Flash Point………………………………………….. 3.Maximum Tank Design Pressure…………………. 4.Maximum Tank Design Vacuum……………… Pumping In Rate……………………………………. 6.Pumping Out Rate…………………………………. 7.Tank Type…………………………………………… 8.Tank Diameter…………………………………… Tank Height…………………………………………. 10.Set Point of the Blanketing Valve…………………. 11.Minimum Recommended Pressure Set Point…… 12.Minimum Recommended Vacuum Set Point……. 13.Emergency Set Point………………………………. = 42,000 Gallons = <100° F = 6.0WC = 1.0WC = 100 GPM = 615 GPM = Vertical = 12 Feet = 20 Feet = 0.5 WC = 2.5 WC = WC = 4.0 WC *Sizing based on API 2000 Version 6, Annex A This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

28 STEP #1: Flow Required from Pump Out Rate Maximum Emptying Rate = 400 GPM 615 GPM x 8.0 (Table 1) = ………………………………………………………..…. 4,920 SCFH Add for thermal flow requirement (Table 2) 42,000 Gallons = …………………..……………………………………...…..……. 1,000 SCFH TOTAL VACUUM REQUIREMENT = …….……………………….…….……….…. 5,920 SCFH* From Pages 4 & 5 in Sales Brochure STEP #2: Flow Required from Thermal Cooling Determine Blanketing Gas Supply Pressure (Example = 90 psig) STEP #3: Size the Blanketing Valve: Check Maximum Flows against Supply Pressure, Page 5 Final Step – Build Model Number From Page 8 of Sales Brochure after Determining the Available Options. Determine flow at 90 psig with a 100% Flowport =39,855 SCFH Air Choose a flow plug, if needed, to reduce the flow to near the requirement =20%flow port 20% flow port delivers= 7,971 SCFH air (8,105 SCFH N2) which is near the 4,200 SCFH requirement This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

29 Material for valve body and components Materials for seals and gaskets Setting range Filter type – 40 Micron Flow capacity reduction plugs Pressure gages Integral purge Check valves Field test setup This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

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31 SERIES 20 FIELD TEST SET-UP Higher Pressure Set Point (2.1 to 69.2 WC) Field Test Kit w/ Outlet Line 3-Way Valve & Sense Line Shut-Off Valve This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

32 STEP #1: Flow Required from Pump Out Rate Maximum Emptying Rate = 615 GPM 615 GPM x 8.0 (Table 1) = ………………………………………………………..…. 4,920 SCFH Add for thermal flow requirement from Table 2 42,000 Gallons = …………………..……………………………………...…..……. 1,000 SCFH TOTAL VACUUM REQUIREMENT = …….……………………….…….……….…. 5,920 SCFH From Pages 4 & 5 in Sales Brochure STEP #2: Flow Required from Thermal Cooling Determine Blanketing Gas Supply Pressure (Example = 90 psig) Determine if flow plug is needed – To reduce flow to near flow requirement 90 psig = 39,855 SCFH. (40,528 N ) is too high Use 20% flow plug to choke down to 7,971 SCFH (air) which is near the 5,920 SCFH required STEP #3: Check Maximum Flows against Supply Pressure Final Step – Build Model Number From Page 8 of Sales Brochure after Determining the Available Options. This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

33 Specifications require 316 stainless steel, pilot-operated Tank Blanketing Valve, with 1 inch FNPT connections (supply and outlet), set at 0.1 in wc *, with Buna-N Seals and gaskets, 20% flow plug and an aluminum/zinc pilot filter. *Notes: 1.) See Table at the bottom of pg. 7. A 2 in WC separation between the TBV Set Point and the pressure setting on the PVRV vent is suggested. 2.) Protectoseals Set Point for our tank blanketing valves is the point at which the TBV opens. It closes at approximately 1.5 in WC higher than the set point. From Page 8 of Sales Brochure 1)Material 2 – 3) Set Point 4)Revision Level 5)Connections 6)Set Point Range 7)Seals and Gaskets 8)Flow Plug/Flowport 9)Pilot Filter Option 10)Check Valve Option 11)Pressure Gauge Option 12)Integral Purge Option 13)Field Test Option This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

34 Specifications require 316 stainless steel, pilot-operated Tank Blanketing Valve, with 1 inch FNPT connections (supply and outlet), set at 0.1 in wc *, with Buna-N Seals and gaskets, 20% flow plug and an aluminum/zinc pilot filter. *Notes: 1.) See Table at the bottom of pg. 7. A 2 in WC separation between the TBV Set Point and the pressure setting on the PVRV vent is suggested. 2.) Protectoseals Set Point for our tank blanketing valves is the point at which the TBV opens. It closes at approximately 1.5 in WC higher than the set point. From Page 8 of Sales Brochure 1)Material 2 – 3) Set Point 4)Revision Level 5)Connections 6)Set Point Range 7)Seals and Gaskets 8)Flow Plug/Flowport 9)Pilot Filter Option 10)Check Valve Option 11)Pressure Gauge Option 12)Integral Purge Option 13)Field Test Option F20AETA0AA000 This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

35 SINGLE PORT OR DIP TUBE SENSING This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.

36 TOTAL TANK PROTECTION CAPABILITIES Blanketing ValvesEnd-of-Line Breather Vents Pipe-Away Breather Vents Vacuum Vents Emergency VentsIn-Line Flame Arresters Combination Vent w/ Flame Arrester Detonation Arresters This information is proprietary to the Protectoseal Co., and is not to be duplicated or distributed without prior written consent.


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