Data Sheet

ManualsBrandsEmerson ManualsOtherY692

Bulletin 74.1:Y692

November 2014

D102032X012

www.fisherregulators.com

Type Y692 Gas Blanketing Regulator System

W5930-1

Figure 1. Type Y692 Low-Pressure Gas Blanketing Regulator

Introduction

An Accu-Pressure™

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 when the liquid is being

pumped out. Also when the vessel is suddenly cooled,

causing vapors inside the vessel to contract, the

regulator system replaces the volume of contracting

vapors with a volume of blanketing gas to prevent

the internal vessel pressure from decreasing. In both

cases, a slight positive vessel pressure prevents

outside air, moisture and other contaminants from

entering the vessel and the possible collapse of the

vessel walls.

The Type Y692 (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 for units with internal

pressure registration or through a downstream control

line for units with external pressure registration.

The Type Y692 is available in NPS 1-1/2 and 2 /

DN 40 and 50 body sizes.

Features

• Ease of Inspection and Maintenance—The union

nut connection between the body and actuator

permits access to the disk and orice by only

removing the diaphragm casing assembly without

removing the body from the line.

• Accuracy of Control—Large diaphragm areas

provide more precise control even at low-pressure

settings and the pitot tube also creates a dynamic

boost that helps provide greater capacity.

• Speed of Response—The downstream pressure is

sensed directly by the diaphragm through the pitot

tube providing quick response.

• Ease of Installation—The Type Y692 is easy

to install in the pipeline because no additional

connections are required.

Summary of content (12 pages)

PAGE 1
Bulletin 74.1:Y692 November 2014 Type Y692 Gas Blanketing Regulator System W5930-1 Figure 1. Type Y692 Low-Pressure Gas Blanketing Regulator Introduction Features An Accu-Pressure™ 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 when the liquid is being pumped out.
PAGE 2
Bulletin 74.1:Y692 Specifications This section lists the specifications of theType Y692 Gas Blanketing Regulator System. Factory specification, such as spring range and orifice size are stamped on the nameplate fastened on the regulator at the factory. Available Configurations Direct-operated pressure reducing regulator with external or internal pressure registration with seven outlet (control) pressure ranges from 1 in. w.c. to 7 psig / 2 mbar to 0.48 bar.
PAGE 3
Bulletin 74.1:Y692 Table 1. Control Pressure Ranges CONTROL PRESSURE RANGE WITH CASE BARREL POINTED DOWN Light Spring Assembly Heavy spring Assembly 1 to 3 in. w.c. / 2 to 7 mbar(2)(3) 3 to 11 in. w.c. / 7 to 27 mbar(2)(4) 6.5 in. w.c. to 1.2 psig / 16 mbar to 83 mbar(5) 0.7 to 2 psig / 48 mbar to 0.14 bar 1 to 3.2 psig / 69 mbar to 0.22 bar 2 to 5.5 psig / 0.14 to 0.38 bar 4 to 10 psig / 0.28 to 0.
PAGE 4
Bulletin 74.
PAGE 5
Bulletin 74.1:Y692 Principle of Operation Installation The Type Y692 Gas Blanketing Regulator reduces a high-pressure gas to maintain a positive low-pressure of blanket gas over a stored liquid when the liquid is being pumped out of the vessel (see Figure 2). Also when the vessel (or tank) is suddenly cooled, causing vapors to contract, the regulator replaces the volume of contracting vapors with a volume of blanketing gas to prevent the internal vessel pressure from decreasing.
PAGE 6
Bulletin 74.1:Y692 API 2000 The American Petroleum Institute Standard 2000 (API 2000) sizing method accounts for liquid pump-out as well as contraction of tank vapors due to cooling. When using API methods: Qtotal = Qpump + Qthermal where, tank, product and personnel in cases of equipment failure, fire exposure or other conditions that could cause the tank pressure or vacuum to exceed operating limits. Sizing can be done by following these steps: 1.
PAGE 7
Bulletin 74.1:Y692 Capacity Information Ordering Information Table 5 gives the typical regulating capacities at selected inlet pressures and outlet (control) pressure settings. Flows are in SCFH (60°F and 14.7 psia) of 0.97 specific gravity nitrogen. For gases of other specific gravities, multiply the given capacity of nitrogen by 0.985 and divide the given capacity by the square root of the appropriate specific gravity of the gas required.
PAGE 8
Bulletin 74.1:Y692 Table 5. Blanketing Regulating Capacities in SCFH / Nm3/h of 0.97 Specific Gravity Nitrogen BODY SIZE OUTLET PRESSURE RANGE(1), ACCURACY AND SPRING COLOR OUTLET PRESSURE SETTING 1 in. w.c. / 2 mbar 1 to 3 in. w.c. / 2 to 7 mbar -1 to 2 in. w.c. / -2 to 5 mbar Brown 3 in. w.c. / 7 mbar 3 to 11 in. w.c. / 7 to 27 mbar -1 to 2 in. w.c. / -2 to 5 mbar 7 in. w.c. / 17 mbar Iridite 6.5 in. w.c to 1.2 psig / 16 to 83 mbar, Green or 0.7 to 2 psig / 48 mbar to 0.
PAGE 9
Bulletin 74.1:Y692 Table 5. Blanketing Regulating Capacities in SCFH / Nm3/h of 0.97 Specific Gravity Nitrogen (continued) BODY SIZE OUTLET PRESSURE RANGE(1), ACCURACY AND SPRING COLOR OUTLET PRESSURE SETTING SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h 0.14 0.34 0.69 1.4 2.8 4.1 5.5 6.9 8.6 10.3 320 680 1030 1580 2500 3410 3650 3650 3650 3650 8.6 18.2 27.6 42.3 67.0 91.4 97.8 97.8 97.8 97.8 930 1560 2350 3620 4420 4420 24.9 41.8 63.0 97.0 118 118 1750 2800 4210 3450 3450 46.9 75.0 113 92.
PAGE 10
Bulletin 74.1:Y692 8.94 / 227 5.88 / 149 2.94 / 75 1/4 NPT DOWNSTREAM CONTROL LINE CONNECTION 10.38 / 264 17.44 / 443 NPT DIMENSIONS 8.94 / 227 A 10.38 / 264 IN. / mm 17.44 / 443 A - CAST IRON FLANGES ARE 10 IN. / 254 mm FACE-TO-FACE; STEEL, STAINLESS STEEL AND HASTELLOY® C FLANGES ARE 14 IN. / 356 mm FACE-TO-FACE. FLANGED DIMENSIONS Figure 3. Dimensions Table 6. Orifice Sizes and Coefficients for Relief Valve Sizing BODY SIZE NPS 1-1/2 and 2 ORIFICE SIZE DN In.
PAGE 11
Bulletin 74.1:Y692 Ordering Information Carefully review the Specifications section, then specify the desired selection on the Ordering Guide. If a pilot setpoint is not requested, the regulator will be factory set at the approximate midrange.
PAGE 12
Bulletin 74:1:Y692 Ordering Guide (continued) Tank Blanketing Specification Worksheet Regulators Quick Order Guide *** ** * Readily Available for Shipment Allow Additional Time for Shipment Special Order, Constructed from Non-Stocked Parts. Consult your local Sales Office for Availability. Availability of the product being ordered is determined by the component with the longest shipping time for the requested construction.