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Bulletin 74.1:Y693

December 2014

D102026X012

www.fisherregulators.com

Type Y693 Gas Blanketing Regulator

Introduction

An Accu-Pressure™ Gas Blanketing Regulator

reduces a high pressure gas, such as nitrogen, to

maintain a protective environment above any liquid

stored in a vessel or tank 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 Y693 (Figure 1) is a direct-operated

regulator used for accurate pressure control on low

pressure blanketing systems. Downstream pressure

is sensed through an external control line in the lower

casing of the regulator. The Type Y693 is available in

NPS 1-1/2 and 2 / DN 40 and 50 body sizes.

Features

• Ease of Inspection and Maintenance—The union

nut and/or hex head bolt 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

pipeline (see Figure 2).

• Accuracy of Control—Balanced trim and large

diaphragm area reduces hysteresis to as little

as +/- 0.50 in. w.c. / 1 mbar deviation from setpoint.

• Inlet Pressure Sensitivity—Less than

0.25 in. w.c. / 0.6 mbar setpoint shift over the

entire inlet pressure range.

• Speed of Response—A change in vessel pressure

registers directly under the diaphragm resulting in

the fastest possible speed of response.

• Variety of Materials—Regulator body, trim

and valve disk are available in various material

combinationsforprocessuidcompatibility.

• Outlet Pressure Stability—4 to 1 lever ratio reduces

regulatorsensitivitytoinletpressureuctuation.

• Tight Shutoff Capability—Aat-faceddisk

of Nitrile (NBR), Fluorocarbon (FKM) or

Polytetrauoroethylene(PTFE)providesexcellent

shutoff capability.

Figure 1. Type Y693 Gas Blanketing Regulator

W6200

Summary of content (12 pages)

PAGE 1
Bulletin 74.1:Y693 December 2014 Type Y693 Gas Blanketing Regulator W6200 Figure 1. Type Y693 Gas Blanketing Regulator Introduction An Accu-Pressure™ Gas Blanketing Regulator reduces a high pressure gas, such as nitrogen, to maintain a protective environment above any liquid stored in a vessel or tank when the liquid is being pumped out.
PAGE 2
Bulletin 74.1:Y693 Specifications This section lists the specifications for the Type Y693 gas blanketing regulators. Factory specification are stamped on the nameplate fastened on the regulator at the factory. Available Configurations Direct-operated pressure reducing regulator with external registration requiring a downstream control line. Ten outlet pressure ranges from 0.5 in. w.c. to 10 psig / 1 mbar to 0.69 bar. Available in NPS 1-1/2 and 2 / DN 40 and 50 body sizes.
PAGE 3
Bulletin 74.1:Y693 closing cap adjusting screw control spring vent spring case diaphragm orifice soft disk lower casing W6240-1 ALUMINUM LOWER CASING VERSION closing cap adjusting screw control spring vent spring case diaphragm orifice soft disk lower casing W6239-1 STEEL OR STAINLESS STEEL LOWER CASING VERSION Figure 2.
PAGE 4
Bulletin 74.1:Y693 Principle of Operation The Type Y693 Gas Blanketing Regulator reduces a higher-pressure gas to maintain a positive low pressure of blanket gas over a stored liquid (see Figure 3). 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 5
Bulletin 74.1:Y693 Table 2.
PAGE 6
Bulletin 74.1:Y693 Table 3.
PAGE 7
Bulletin 74.1:Y693 Table 4. Flow Rate Conversion (Gas flow required to replace or displace Blanketing Gas with Pump-Out or Pump-In of Liquid) MULTIPLY MAXIMUM PUMP RATE IN: BY TO OBTAIN: U.S. GPM U.S. GPH Barrels/hour Barrels/day 8.021 0.1337 5.615 0.2340 SCFH air required SCFH air required SCFH air required SCFH air required Table 5.
PAGE 8
Bulletin 74.1:Y693 Table 6. Typical Type Y693 Blanketing Regulator Capacities in Scfh / Nm3/h of 0.97 Specific Gravity Nitrogen SPRING RANGE, PART NUMBER AND COLOR control PRESSURE SETTING Deviation from Setpoint ±0.5 In. w.c. / ±1 mbar In. w.c. 0.5 to 2 in. w.c. / 1 to 5 mbar 1D892527022 INLET PRESSURE CAPACITIES IN SCFH / Nm3/h OF 0.97 SPECIFIC GRAVITY NITROGEN FOR 1-1/2 AND 2 in. / DN 40 AND 50 BODIES WITH A 1/2 in. / 13 mm ORIFICE 0.5(1) -0.5 to 1 In. w.c. / -1 to 2 mbar -0.5 to 2 In. w.c.
PAGE 9
Bulletin 74.1:Y693 Table 6. Typical Type Y693 Blanketing Regulator Capacities in Scfh / Nm3/h of 0.97 Specific Gravity Nitrogen (continued) SPRING RANGE, PART NUMBER AND COLOR control PRESSURE SETTING Deviation from Setpoint ±1 In. w.c. / ±2 mbar In. w.c. 8 to 18 in. w.c. / 20 to 45 mbar 1D893227032 INLET PRESSURE CAPACITIES IN SCFH / Nm3/h OF 0.97 SPECIFIC GRAVITY NITROGEN FOR 1-1/2 AND 2 in. / DN 40 AND 50 BODIES WITH A 1/2 in. / 13 mm ORIFICE 11 ±2 In. w.c.
PAGE 10
Bulletin 74.1:Y693 Table 6. Typical Type Y693 Blanketing Regulator Capacities in Scfh / Nm3/h of 0.97 Specific Gravity Nitrogen (continued) SPRING RANGE, PART NUMBER AND COLOR control PRESSURE SETTING Deviation from Setpoint ±0.5 In. w.c. / ±1 mbar psig 2 to 5 psig / 138 mbar to 0.3 bar 1P615427142 INLET PRESSURE CAPACITIES IN SCFH / Nm3/h OF 0.97 SPECIFIC GRAVITY NITROGEN FOR 1-1/2 AND 2 in. / DN 40 AND 50 BODIES WITH A 1/2 in. / 13 mm ORIFICE 3 ±1 In. w.c.
PAGE 11
Bulletin 74.1:Y693 3/4 npt VENT CONNECTION 11.88 / 302 14.00 / 356 5.88 / 149 2.94 / 75 1/2 NPT DOWNSTREAM CONTROL CONNection 10.38 / 264 1-1/2 AND 2 NPT 17.44 / 443 14B0812-A 7.06 / 179 STEEL OR STAINLESS STEEL LOWER CASING VERSION 3/4 NPT Vent connection 12.25 / 311 14.00 / 356 6.12 / 155 3.19 / 81 2.19 / 56 14B0813-A 1-1/2 AND 2 NPT 3/4 NPT downstream control connection 10.62 / 270 17.69 / 449 aLUMINUM LOWER CASING VERSION WITH A STEEL BODY IN. / mm Figure 4.
PAGE 12
Bulletin 74.1:Y693 3/4 NPT Vent connection 2.06 / 52 12.25 / 311 6.12 / 155 3.19 / 81 10.62 / 270 1-1/2 AND 2 NPT 3/4 NPT downstream control connection 17.69 / 449 IN. / mm 14B0814-A B2438 aLUMINUM LOWER CASING VERSION WITH A CAST IRON BODY Figure 4. Type Y693 Dimensions (continued) Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc.