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

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...

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...

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...

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...

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...

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...

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

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

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

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

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

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

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

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

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