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T205B Balanced Tank Blanketing Regulator

T205B Balanced Tank Blanketing Regulator

Product catalog summary

Introduction
Tank blanketing is a process where a gas, usually nitrogen, covers the surface of a liquid in a storage vessel to maintain a slightly positive pressure. This helps prevent vaporization, reduces combustibility, and avoids oxidation or contamination. The Type T205B regulator is specifically designed to maintain this pressure with a fully balanced plug design and a large diaphragm for precise control.

Specifications
The Type T205B regulator includes specifications such as maximum temperature, inlet and outlet pressures, spring range, and orifice size. It is available in materials like gray cast iron, carbon steel, and stainless steel, and is capable of handling various pressure ranges with specific material temperature capabilities.

Features
- Fully Balanced Plug Design: Ensures stable flow and greater regulating capacity.
- Large Diaphragm: Sensitive to pressure changes, available in various materials.
- Low-Pressure Setting and Fast Response: Suitable for low-pressure settings, reacts quickly to changes.
- Accurate Control and Small Lockup Pressure: Provides precise control with minimal lockup pressure.
- Sour Gas Service Capability: Meets NACE MR0175-2002 standards.

Principle of Operation
The regulator maintains vapor space pressure over stored liquid by adjusting gas flow based on pressure changes in the tank, ensuring balanced pressure unaffected by inlet pressure variations.

Installation
The regulator can be installed in any orientation, with recommendations for optimal performance. Proper installation ensures complete actuator casing drainage and prevents vent blockage.

Overpressure Protection
Downstream overpressure protection is necessary if inlet pressure exceeds outlet pressure ratings. The regulator complies with NACE standards for sour gas applications.

Capacity Information
Capacity tables are based on air with a specific gravity of 1.0, with correction factors for other gases. The regulator's capacity is influenced by factors such as spring range and inlet pressure.

Ordering Information
Guides are provided to ensure correct specification and configuration of the regulator.

Overview
This document is a technical publication from Emerson Process Management, focusing on their Regulator Technologies. It includes contact information for global offices and a disclaimer regarding the accuracy and applicability of the information.

Disclaimer
The document states that the information is for informational purposes only and should not be considered warranties or guarantees. Emerson Process Management reserves the right to modify product designs or specifications without notice.

Contact Information
Contact details for Emerson Process Management's headquarters and regional offices across the USA, Asia-Pacific, Europe, and the Middle East and Africa are provided.

Product Identification
The distinctive diamond shape on the spring case identifies the regulator as part of the Fisher® brand, ensuring high-quality engineering and support.

Specification Worksheet
This section provides a worksheet for specifying application requirements, including line size, fluid type, temperature, pressure requirements, and performance accuracy, as well as inquiries about overpressure protection and equipment selection assistance.

Regulators Quick Order Guide
The guide categorizes products based on their availability for shipment, indicating whether they are readily available, require additional time, or are special orders constructed from non-stocked parts.

Catalog excerpts

T205B Balanced Tank Blanketing Regulator-1

Type T205B Balanced Tank Blanketing Regulator Figure 1. Type T205B Balanced Tank Blanketing Regulator • Fully Balanced Plug Design • Large Diaphragm • Low-Pressure Setting and Fast Speed of Response • Accurate Control and Small Lockup Pressure • Sour Gas Service Capability

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T205B Balanced Tank Blanketing Regulator-2

Bulletin 74.1:T205B Specifications This section lists the specifications of the Type T205B Balanced Tank Blanketing Regulator. Factory specification, such as maximum temperature, maximum inlet and outlet pressures, spring range and seat or orifice size are stamped on the nameplate fastened on the regulator at the factory. Body Sizes and End Connection Styles See Table 1 Maximum Allowable Inlet Pressure(1) See Table 1 Flow Capacities See Table 9 Maximum Operating Inlet Pressure(1) Gray cast iron: 150 psig / 10.3 bar WCC Carbon steel or CF8M/CF3M Stainless steel: 200 psig / 13.8 bar Material Temperature...

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T205B Balanced Tank Blanketing Regulator-3

Bulletin 74.1:T205B BALANCED TRIM ASSEMBLY PUSHER POST INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE PRESSURE REGISTRATION VALVE DISK CONTROL SPRING INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE Figure 2. Type T205B Operational Schematic Type T205B Tank Blanketing Regulator Fully Balanced Plug Design — Eliminates setpoint changes caused by varying inlet pressure. This design provides smooth opening of the plug for stable flow and greater regulating flow capacity. Large Diaphragm — Highly sensitive to changes in tank pressure. Available in various materials to suit...

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T205B Balanced Tank Blanketing Regulator-4

Bulletin 74.1:T205B HORIZONTAL PIPELINE VENT POINTED DOWN DOWNSTREAM CONTROL LINE INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE Figure 3. Type T205B Actuator Casing Drainage Table 1. Body Sizes, End Connection Styles, and Maximum Allowable Inlet Pressures Inch BODY SIZE BODY MATERIAL MAXIMUM ALLOWABLE INLET PRESSURE psig bar Gray cast iron 3/4 or 1 WCC Carbon steel CF8M/CF3M Stainless steel(2) 1. All flanges are welded. Weld-on flange dimension is 14 inches / 356 mm face-to-face. 2. Pipe nipples and flanges are 316 Stainless steel for flanged body assemblies. Overpressure...

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T205B Balanced Tank Blanketing Regulator-5

Bulletin 74.1:T205B Table 2. Outlet (Control) Pressure Ranges and Spring Information OUTLET (CONTROL) PRESSURE RANGE Inches w.c. SPRING WIRE DIAMETER SPRING COLOR SPRING FREE LENGTH Orange Red Unpainted Yellow Green Light Blue Black 1. Do not use Fluorocarbon (FKM) diaphragm with this spring at diaphragm temperatures lower than 60°F / 16°C. 2. To achieve the published outlet pressure range the spring case must be installed pointing down. Table 3. Available Construction and Trim Materials AVAILABLE CONSTRUCTION MATERIALS Body and Casing Guide Insert Diaphragm Head AVAILABLE TRIM OPTIONS Lever...

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T205B Balanced Tank Blanketing Regulator-6

Table 6. Flow Rate Required due to Thermal Cooling Sizing Blanketing Systems When sizing a gas blanketing regulator system for a low-pressure blanketing application, consider the replacement of blanketing gas required for the liquid loss during pump out of the vessel plus the condensation/contraction of vessel vapors during atmospheric thermal cooling. Using the established procedures from American Petroleum Institute Standard 2000 (API 2000), determine the flow rate of ^total ^pump ^thermal Qtotal: Required Flow Rate. Qpump: Required Flow Rate to replace pumped Qtnermal: Required Flow Rate due...

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T205B Balanced Tank Blanketing Regulator-7

Bulletin 74.1:T205B Capacity Information Capacity tables are based on 1.0 specific gravity air. If other blanketing gas is used, convert the tabular values as follows. For blanketing (pad) gases other than air, multiply the given air flow rate by the correction factors in Table 6. For gases of other specific gravities, divide the given air flow rate by the square root of the appropriate specific gravity. Table 8. Type T205B Cv Coefficient SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE Cv COEFFICIENT 1 Inch / DN 25 Body Size 1.0 to 2.5 inches w.c. / 2.5 to 6.2...

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T205B Balanced Tank Blanketing Regulator-8

Bulletin 74.1:T205B Table 8. Type T205B Cv Coefficient (continued) SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE 1 Inch / DN 25 Body Size 3/4 Inch / DN 20 Body Size

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T205B Balanced Tank Blanketing Regulator-9

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T205B Balanced Tank Blanketing Regulator-10

Bulletin 74.1:T205B Table 8. Type T205B Cv Coefficient (continued) SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE 1 Inch / DN 25 Body Size 0.5 to 1.2 psig / 34 to 83 mbar Yellow 3/4 Inch / DN 20 Body Size

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T205B Balanced Tank Blanketing Regulator-11

Bulletin 74.1:T205B Table 8. Type T205B Cv Coefficient (continued) SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE 1 Inch / DN 25 Body Size 1.2 psig to 2.5 psig / 83 to 172 mbar Green 3/4 Inch / DN 20 Body Size

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T205B Balanced Tank Blanketing Regulator-12

Bulletin 74.1:T205B Table 8. Type T205B Cv Coefficient (continued) SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE 1 Inch / DN 25 Body Size 2.5 to 4.5 psig / 0.17 to 0.31 bar Light Blue 3/4 Inch / DN 20 Body Size

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T205B Balanced Tank Blanketing Regulator-13

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T205B Balanced Tank Blanketing Regulator-14

Bulletin 74.1:T205B Table 9. Type T205B Flow Capacities SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE CAPACITIES IN SCFH / Nm3h OF AIR 3/4 Inch / DN 20 Body Size 1 Inch / DN 25 Body Size 1.0 to 2.5 inches w.c. / 2.5 to 6.2 mbar Orange

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T205B Balanced Tank Blanketing Regulator-15

Bulletin 74.1:T205B Table 9. Type T205B Flow Capacities (continued) SPRING RANGE AND COLOR OUTLET PRESSURE SETTING OFFSET FROM SETPOINT INLET PRESSURE CAPACITIES IN SCFH / Nm3h OF AIR 3/4 Inch / DN 20 Body Size 1 Inch / DN 25 Body Size Nm3h

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