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ACE97 Pad-Depad Valve

ACE97 Pad-Depad Valve

Product catalog summary

Introduction
The Type ACE97 Pad-Depad valve is a pilot-operated valve designed to maintain an inert gas blanket over stored products, protecting them from atmospheric contamination. It helps reduce combustibility, control vapor space pressure, and prevent tank collapse by maintaining minimum pressure during normal operations.

Specifications

Pad Body Sizes: NPS 1/2, 1, and 2 / DN 15, 25, and 50
Maximum Operating Inlet Pressure: 200 psig / 13.8 bar
Temperature Capabilities: Varies by material, e.g., Nitrile (NBR): -20 to 180°F / -29 to 82°C
Construction Materials: Stainless steel for body, bonnet, cage, actuator, and trim

Features and Benefits

Pilot Controlled: Ensures high accuracy and control.
Fully Balanced: Eliminates setpoint changes due to inlet pressure variations.

Principle of Operation

Pad Operation: Activates when tank pressure decreases below setpoint, allowing gas flow to maintain pressure.
Depad Operation: Activates when tank pressure exceeds setpoint, releasing excess pressure.

System Sizing
Proper sizing is crucial to maintain setpoint pressure and prevent overpressure. Sizing must consider pump rates, gas specific gravity, and tank volume.

Diagnostics
Features a diagnostic gauge for field analysis, simplifying maintenance and ensuring reliability.

Tables and Data
Includes detailed tables for flow rate conversion, correction factors, and capacity information for pad and depad valves, ensuring accurate system design and operation.

Overview
This document provides detailed specifications and capacities for various pad and depad valves used in industrial applications, focusing on nitrogen and air flow capacities. It includes tables with flow capacities under different conditions and dimensions for valve configurations.

Specifications
The document outlines the capacities of pad valves for nitrogen with a specific gravity of 0.97 and depad valves for air with a specific gravity of 1.0. It provides flow capacities in SCFh (Standard Cubic Feet per Hour) and Nm3/h (Normal Cubic Meters per Hour) for different valve sizes (NPS 1, NPS 2, NPS 3, and NPS 4) and Cv values.

Procedures
The document emphasizes the importance of using differential pressure between tank pressure and vent header pressure to calculate flow through the depad valve. It also provides a specification worksheet that requires information on operating pressures, temperatures, and specific gravity of gases.

Norms and Standards
The document refers to Bulletin 74.3:ACE97, which likely contains industry standards for these types of valves. It also specifies the use of certain materials like 316 SST for construction and various elastomers for compatibility with stored liquids and vapors.

Recommendations
Users are advised to refer to the sizing section or contact a sales office if the required valve Cv value is unknown. The document also suggests specifying measurement units (Imperial or Metric) and provides options for connections (NPT, Flanged, or other).

Key Data from Tables
The tables provide detailed flow capacities for different inlet pressures and differential pressures, with typical accuracy noted as ±0.5 inch w.c. / 1 mbar. Dimensions for valve configurations are provided in both inches and millimeters.

Critical Information
The document highlights the need for accurate pressure and temperature data to ensure proper valve sizing and operation. It also stresses the importance of material compatibility with stored liquids and vapors.

Ordering Guide Overview
This document provides a comprehensive guide for ordering pad and depad valve bodies, specifying materials, sizes, and configurations.

Valve Body Material Selection
Options include CF8M and CF3M stainless steel.

Body Size and Coefficient
Pad Valve Body sizes range from NPS 1/2 to NPS 2 with various Cv values. Depad Valve Body sizes range from NPS 1 to NPS 4 with corresponding Cv values.

Pad Inlet Connection
Available for NPS 1/2, NPS 1, and NPS 2 body sizes with options for NPT and CL150 RF threaded flange and nipple.

Tank Connection
Must match or exceed the largest valve body size, with options from NPS 1 to NPS 4, CL150 RF.

Diaphragm and Elastomer Selection
Options include Nitrile (NBR), Ethylenepropylene (EPDM), Fluorocarbon (FKM), and Perfluoroelastomer (FFKM).

Control Pressure Ranges
Various pad and depad setpoints are available, ranging from inches w.c. to psig.

S.A.M. Tank Connection
Optional single nozzle tank connection available.

Additional Options
Includes pressure gauges, sensing line purge, main line purge, pressure switches, and check valves.

Contact Information
Emerson Process Management provides contact details for various regions including the USA, Asia-Pacific, Europe, and the Middle East.

Disclaimer
The document emphasizes that the information is for informational purposes only and does not constitute a warranty or guarantee.

Catalog excerpts

type aCe97 Pad-Depad valve • Bubble Tight Shutoff • Frictionless Pilot Valve • Pilot Controlled • Maximum Vapor Space Control • Stainless Steel Figure 1. Type ACE97 Pad-Depad Valve

Open the catalog to page 1

Bulletin 74.3:ACE97 Specifications Pad Specifications General Type ACE97 Specifications Pressure Registration External Maximum Operating Inlet Pressure(1) 200 psig / 13.8 bar Temperature Capabilities Nitrile (NBR): -20 to 180°F / -29 to 82°C Fluorocarbon (FKM): 0 to 212°F / -18 to 100°C Ethylenepropylene (EPDM - FDA): -20 to 212°F / -29 to 100°C Perfluoroelastomer (FFKM): -20 to 212°F / -29 to 100°C Maximum Main Valve Inlet Pressure(1) 200 psig 13.8 bar Control Pressure Ranges(1) See Table 1 Maximum and Minimum Differential Pressures(1) Minimum: 25 psig / 1.7 bar Maximum: 200 psig / 13.8 bar...

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depad pilot valve Depad main valve vent actuator inlet filter Figure 2. Type ACE97 Pad-Depad Valve Parts Single Array Manifold (SAM): Provides sense line connection and main valve connection through a single tank nozzle. Purge Meters: Prevents corrosive tank vapors from damaging upstream equipment. Principle of Operation Pad (Figure 3) NPS 1 and 2 / DN 25 and 50 Pad Valves (Figure 3) When tank pressure decreases below the pad setpoint (due to pump out operations or thermal cooling), the actuator diaphragm moves downward pushing open the pad pilot. This creates flow from the pad loading chamber...

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Bulletin 74.3:ACE97 loading pressure exhausted back to tank on/off diagnostic gauge depad pilot adjustable deadband poppet cage controlled pressure range spring depad main valve o-ring seat inlet inlet bleed rolling diaphragm sensing connection open pilot diagnostic port main valve spring INLET PRESSURE ATMOSPHERIC PRESSURE TANK PRESSURE PILOT LOADING PRESSURE VENT HEADER PRESSURE tank connection INLET BLEED PRESSURE Figure 3. Type ACE97 Pad On / Depad Off loading pressure exhausted back to tank depad pilot controlled pressure range spring depad main valve o-ring seat on/off diagnostic gauge...

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Bulletin 74.3:ACE97 Table 1. Control Pressure Ranges Controlled Pressure RANGEs Pad Setpoint Depad Setpoint (Above Pad) SPRING FREE LENGTH SPRING WIRE DIAMETER 1. Two nested springs are used. System Sizing Tank Blanketing systems must be properly sized to have capacity to supply enough blanketing gas to maintain the setpoint pressure, yet large enough to vent excess gas without having tank vapor space pressure rise above allowable limits. Pad valves must not be so large that they cause overpressure. Sizing must also take into account applicable codes and standards as they apply to the installation....

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Bulletin 74.3:ACE97 Table 2. Flow Rate Conversion multiply maximum pump rate U.S. GPM U.S. GPH m3/hr Barrels/hr Barrels/day to obtaiN: SCFH SCFH Nm3/h SCFH SCFH Table 3. Correction Factors (For Converting Nitrogen Flow Rates to Other Gas Flow Rates) SPECIFIC GRAVITY 0.60 1.00 1.52 Correction Factor = Table 4. Correction Factors (For Converting Air Flow Rates to Other Gas Flow Rates) Table 5. Flow Rate Requirements for Liquid Pump-In Pump-Out per API 2000 Pump-Out (Inbreathing) Pump-In (Outbreathing) Flashpoint > 100°F / 38°C or Normal Boiling Point > 300°F / 149°C 5.6 SCFH / 0.15 Nm3/h of air...

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Table 8. NPS 1 / DN 25 Pad Valve Capacities of 0.97 Specific Gravity Nitrogen INLET PRESSURE

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Bulletin 74.3:ACE97 Table 10. NPS 1 / DN 25 Depad Valve Capacities of 1.0 Specific Gravity Air flow capacity in scfh / Nm3/h of 1.0 specific gravity air 1.0 psig 1.1 psig 1.2 psig 1.3 psig 1.4 psig 1.5 psig 1.6 psig 1.7 psig 1.8 psig 1.9 psig 2.0 psig 2.1 psig 2.2 psig 2.3 psig 2.4 psig 2.5 psig 2.6 psig 2.7 psig 2.8 psig 1. Always use the differential pressure between tank pressure (depad setpoint) and vent header (vapor recovery) pressure to calculate flow through the depad valve.

Open the catalog to page 8

Bulletin 74.3:ACE97 Table 11. NPS 2 / DN 50 Depad Valve Capacities of 1.0 Specific Gravity Air flow capacity in scfh / Nm3/h of 1.0 specific gravity air 1.0 psig 1.1 psig 1.2 psig 1.3 psig 1.4 psig 1.5 psig 1.6 psig 1.7 psig 1.8 psig 1.9 psig 2.0 psig 2.1 psig 2.2 psig 2.3 psig 2.4 psig 2.5 psig 2.6 psig 2.7 psig 2.8 psig 1. Always use the differential pressure between tank pressure (depad setpoint) and vent header (vapor recovery) pressure to calculate flow through the depad valve.

Open the catalog to page 9

Bulletin 74.3:ACE97 Table 12. NPS 3 / DN 80 Depad Valve Capacities of 1.0 Specific Gravity Air flow capacity in scfh / Nm3/h of 1.0 specific gravity air 1.0 psig 1.1 psig 1.2 psig 1.3 psig 1.4 psig 1.5 psig 1.6 psig 1.7 psig 1.8 psig 1.9 psig 2.0 psig 2.1 psig 2.2 psig 2.3 psig 2.4 psig 2.5 psig 2.6 psig 2.7 psig 2.8 psig 1. Always use the differential pressure between tank pressure (depad setpoint) and vent header (vapor recovery) pressure to calculate flow through the depad valve.

Open the catalog to page 10

Bulletin 74.3:ACE97 Table 13. NPS 4 / DN 100 Depad Valve Capacities of 1.0 Specific Gravity Air flow capacity in scfh / Nm3/h of 1.0 specific gravity air 1.0 psig 1.1 psig 1.2 psig 1.3 psig 1.4 psig 1.5 psig 1.6 psig 1.7 psig 1.8 psig 1.9 psig 2.0 psig 2.1 psig 2.2 psig 2.3 psig 2.4 psig 2.5 psig 2.6 psig 2.7 psig 2.8 psig 1. Always use the differential pressure between tank pressure (depad setpoint) and vent header (vapor recovery) pressure to calculate flow through the depad valve.

Open the catalog to page 11

1/2 NPT SENSING CONNECTION NPS 1 / DN 25, CL150 RF VAPOR RECOVERY CONNECTION 12.3 / 312 VAPOR RECOVERY CONNECTION 1/2 NPT SENSING CONNECTION TANK CONNECTION Figure 5. Type ACE97 Pad/Depad Valve Dimensions Table 14. Type ACE97 Pad/Depad Valve Dimensions DIMENSIONS IN INCH / mm FOR NPS 1 x 1 x 1 OR 2 / DN 25 x 25 x 25 OR 50 BODy WITH OPTIONS A DIMENSIONS IN INCH / mm FOR NPS 1 x 3 x 3 or 4 / DN 25 x 80 x 80 OR 100 BODy WITH OPTIONS A

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VAPOR RECOVERY CONNECTION 1/2 NPT SENSING CONNECTION C NPS 1 or 2 / DN 25 or 50, CL150 RF VAPOR RECOVERY CONNECTION TANK CONNECTION NPS 1/2 x 1 x 2 / DN 15 x 25 x 50 WITH SINGLE ARRAY MANIFOLD Figure 5. Type ACE97 Pad/Depad Valve Dimensions (continued) Table 14. Type ACE97 Pad/Depad Valve Dimensions (continued) DIMENSIONS IN INCH / mm FOR NPS 1/2 x 1 x 1 OR 2 / DN 15 x 25 x 25 OR 50 BODy WITH OPTIONS A DIMENSIONS IN INCH / mm FOR NPS 1/2 x 1 x 2 / DN 15 x 25 x 50 BODY WITH SINGLE ARRAY MANIFOLD A

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ACE97 Pad-Depad Valve

ACE97 Pad-Depad Valve

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