Data Sheet

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Bulletin 74.1:Y690A

January 2010

D102591X012

www.sherregulators.com

Y690A Series Gas Blanketing Regulators

W7293

Figure 1. Y690A Series Direct-Operated Gas Blanketing Regulators

Introduction

The Y690A Series Gas Blanketing Regulator System

reduces a high-pressure gas, such as nitrogen,

to maintain a protective environment above any

liquid stored in a tank or vessel. The regulator

system replaces the volume of vapors with a

volume of blanketing gas to prevent the internal

vessel pressure from decreasing, when liquid is

being pumped out or when the vessel is suddenly

cooled, causing vapors to contract. In both cases

a slight positive vessel pressure prevents outside

air, moisture and other contaminants from entering

the vessel. Type Y690A (Figure 1) is a direct-operated

regulator used for accurate pressure control on very

low-pressure blanketing systems. Downstream

pressure is sensed through a pitot tube installed in

the lower casing of the regulator, thus no external

control line is required. Type Y690AM uses a

control line to more accurately control the pressure

if the regulator is mounted away from the tank.

Features

• Easy Conversion Between Constructions—

Converts easily from Type Y690A to Type Y690AM

with two O-rings and one machine screw.

• Sour Gas Service Capability—For sour gas

applications, the Y690A Series regulators are

available in materials that comply with National

Association of Corrosion Engineers (NACE)

Standards MR0175 and MR0103.

• Inlet Pressure Equals Outlet Pressure—Full

inlet pressure capability on the downstream side

of the regulator.

• Corrosion Resistance—Multiple regulator

constructions are available in a variety of materials

for compatibility with corrosive process gases.

• Multiple Applications—Y690A Series can be used

for a wide variety of gases including air, nitrogen,

natural gas, sour gas, butane, and propane.

Summary of content (16 pages)

PAGE 1
Bulletin 74.1:Y690A January 2010 Y690A Series Gas Blanketing Regulators W7293 Figure 1. Y690A Series Direct-Operated Gas Blanketing Regulators Features Introduction • Easy Conversion Between Constructions— Converts easily from Type Y690A to Type Y690AM with two O-rings and one machine screw. The Y690A Series Gas Blanketing Regulator System reduces a high-pressure gas, such as nitrogen, to maintain a protective environment above any liquid stored in a tank or vessel.
PAGE 2
Bulletin 74.1:Y690A Specifications Available Configurations Type Y690A: Direct-operated pressure reducing regulator for outlet pressures up to 7-inches w.c. (17 mbar) equipped with a pitot tube for greater regulated capacities. Type Y690AH: Direct-operated pressure reducing regulator for outlet pressures up to 7 psig (0,48 bar) equipped with a pitot tube for greater regulated capacities.
PAGE 3
Bulletin 74.1:Y690A Table 1. End Connection Styles END CONNECTION STYLE BODY SIZE, NPS (DN) 3/4 or 1 (20 or 25) Ductile Iron Stainless Steel NPT NPT, SWE, CL150 RF, CL300 RF, or PN 16/25/40 Table 2. Orifice Sizes and Flow and Sizing Coefficients WIDE-OPEN FOR RELIEF VALVE SIZING ORIFICE SIZE, INCHES (mm) 1/8 1/4 3/8 1/2 9/16 (3,2) (6,4) (9,5) (13) (14) Cg CV 12.3 50 110 200 250 0.35 1.43 3.14 5.71 7.14 IEC SIZING COEFFICIENTS C1 35 XT FD FL 0.78 0.50 0.89 Table 3.
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Bulletin 74.1:Y690A VALVE DISK DOWNSTREAM CONTROL LINE FOR TYPES Y690AM AND Y690AHM LEVER PITOT TUBE FOR TYPES Y690A AND Y690AH VALVE STEM SLIDING PUSHER POST INLET PRESSURE OUTLET PRESSURE OVERPRESSURE SPRING ATMOSPHERIC PRESSURE B2625 Figure 2. Y690A Series Operational Schematic Principle of Operation With Internal Registration (Refer to Figure 3) Types Y690A and Y690AH are direct-operated regulators with internal registration (see Figures 2 and 3).
PAGE 5
Bulletin 74.1:Y690A VENT VALVE BLOCK VALVE SUPPLY PRESSURE VENT VALVE BLOCK VALVE GAS BLANKETING PRESSURE INLET PRESSURE GAS BLANKETING PRESSURE VESSEL/TANK ATMOSPHERIC PRESSURE Figure 3. Type Y690A or Y690AH with Internal Registration Operational Schematic VENT VALVE VENT VALVE BLOCK VALVE BLOCK VALVE VENT VALVE BLOCK VALVE INLET PRESSURE GAS BLANKETING PRESSURE VENT POINTED DOWN GAS BLANKETING PRESSURE ATMOSPHERIC PRESSURE VESSEL/TANK Figure 4.
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Bulletin 74.1:Y690A Table 6. Vessel Capacity Table 7.
PAGE 7
Bulletin 74.1:Y690A 3. Add the requirements of 1 and 2 and select regulator size, based on total capacity required from Table 9 or 10. Sample sizing problem for blanketing applications: Vessel Capacity . . . . . . . . . . . . 12 500 gallons (47 318 l) Pump In/Out Capacity . . . . . . . . . 120 GPM (454 l/min) Inlet Pressure Source . . . . . . . 60 psig (4,1 bar) Nitrogen Desired Blanket Setpoint . . . . . . 3.0-inches w.c. (7 mbar) 1.
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Bulletin 74.1:Y690A Table 9. Types Y690A and Y690AM Capacities BODY SIZE, NPS (DN) OUTLET PRESSURE RANGE, PART NUMBER, AND COLOR OUTLET PRESSURE SETTING 1-inch w.c. (2 mbar) 1 to 2.5-inches w.c. (2 to 6 mbar) 1B558527052 Orange 2.5-inches w.c. (6 mbar) 2.5-inches w.c. (6 mbar) 3/4 (20) 2.5 to 7-inches w.c. (6 to 17 mbar) 3-inches w.c. (7 mbar) 1B653827052 Red 7-inches w.c.
PAGE 9
Bulletin 74.1:Y690A Table 9. Types Y690A and Y690AM Capacities (continued) BODY SIZE, NPS (DN) OUTLET PRESSURE RANGE, PART NUMBER, AND COLOR OUTLET PRESSURE SETTING 1-inch w.c. (2 mbar) 1 to 2.5-inches w.c. (2 to 6 mbar) 1B558527052 Orange 2.5-inches w.c. (6 mbar) 2.5-inches w.c. (6 mbar) 1 (25) 2.5 to 7-inches w.c. (6 to 17 mbar) 3-inches w.c. (7 mbar) 1B653827052 Red 7-inches w.c.
PAGE 10
Bulletin 74.1:Y690A Table 10. Types Y690AH and Y690AHM Capacities OUTLET PRESSURE RANGE, CONTROL SPRING PART NUMBER, AND COLOR NPS 3/4 (DN 20) BODY SIZE OFFSET FROM SETPOINT OUTLET PRESSURE SETTING 1 (69 mbar) 5 to 10-inches w.c. (12 to 25 mbar) 1B653827052 Red 1-inch w.c. (2 mbar) 7-inches w.c. (17 mbar) 1B653927022 Unpainted 15-inches w.c. (37 mbar) 15-inches w.c. to 1.2 psig (37 mbar to 83 mbar) 5.5-inches w.c. (14 mbar) 1B537027052 Yellow 1.
PAGE 11
Bulletin 74.1:Y690A Table 10. Types Y690AH and Y690AHM Capacities (continued) OUTLET PRESSURE RANGE, CONTROL SPRING PART NUMBER, AND COLOR 1.2 to 2.5 psig (83 mbar to 0,17 bar) NPS 3/4 (DN 20) BODY SIZE OFFSET FROM SETPOINT OUTLET PRESSURE SETTING 1.2 psig (83 mbar) 0.2 psig (14 mbar) 1B537127022 Light green 2.5 psig (0,17 bar) 2.5 psig (0,17 bar) 2.5 to 4.5 psig (0,17 to 0,31 bar) 1B537227022 Light blue 0.3 psig (21 mbar) 4.5 psig (0,31 bar) 4.5 psig (0,31 bar) 4.
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Bulletin 74.1:Y690A Table 10. Types Y690AH and Y690AHM Capacities (continued) OUTLET PRESSURE RANGE, CONTROL SPRING PART NUMBER, AND COLOR NPS 1 (DN 25) BODY SIZE OFFSET FROM SETPOINT OUTLET PRESSURE SETTING 1B653827052 Red 1-inch w.c. (2 mbar) 7-inches w.c. (17 mbar) 1B653927022 Unpainted 1-inch w.c. (2 mbar) 11-inches w.c. (27 mbar) 15-inches w.c. (37 mbar) 15-inches w.c to 1.2 psig (37 to 83 mbar) 1B537027052 Yellow 5.5-inches w.c. (14 mbar) 1.
PAGE 13
Bulletin 74.1:Y690A Table 10. Types Y690AH and Y690AHM Capacities (continued) OUTLET PRESSURE RANGE, CONTROL SPRING PART NUMBER, AND COLOR 1.2 to 2.5 psig (83 mbar to 0,17 bar) NPS 1 (DN 25) BODY SIZE OFFSET FROM SETPOINT OUTLET PRESSURE SETTING 1.2 psig (83 mbar) 0.2 psig (14 mbar) 2.5 psig (0,17 bar) 2.5 psig (0,17 bar) 1B537227022 Light blue 0.3 psig (21 mbar) 4.5 psig (0,31 bar) 4.5 psig (0,31 bar) 4.
PAGE 14
Bulletin 74.1:Y690A G F D 8.38 (213) 1/2 NPT CONTROL LINE CONNECTION B 14 (356) A NPT OR SWE 5.56 (141) 1/4 NPT VENT FLANGED INCHES (mm) A BODY SIZE, NPS (DN) 3/4, 1 (20, 25) B D F G Ductile Iron Stainless Steel Ductile Iron Stainless Steel Ductile Iron Stainless Steel Ductile Iron Stainless Steel Ductile Iron Stainless Steel 4.0 (102) 4.12 (105) 2.12 (54) 2.25 (57) 6.19 (157) 6.19 (157) 10.12 (257) 10.12 (257) 1.53 (39) 1.53 (39) Figure 5.
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Bulletin 74.
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Bulletin 74.1:Y690A Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation USA - Headquarters McKinney, Texas 75069-1872 USA Tel: 1-800-558-5853 Outside U.S. 1-972-548-3574 USA - Headquarters McKinney, Texas 75069-1872 USA Tel: 1-800-558-5853 Outside U.S.