Emerson ES-950, ES-850 Instruction Manual

Instruction Manual D104632X012

February 2021

Enardo ES-850 and Enardo ES-950 Series

Enhanced Sealing Enardo ES-850 and Enardo ES-950 Series Pressure/Vacuum Relief Valve

P1854

MODEL ENARDO ES-850

P1854

MODEL ENARDO ES-950 MODEL ENARDO ES-950

Figure 1. Enardo ES-850 and Enardo ES-950 Series

Pressure/Vacuum Relief Valve

Table of Contents

Introduction ........................................................................... 2

Specifications .......................................................................2

Product Identification and Marking ....................................... 5

Principle of Operation ........................................................... 5

Installation ............................................................................8

Maintenance ....................................................................... 11

Adjustments ........................................................................ 14

Valve Repair ....................................................................... 16

MODEL ENARDO ES-850

Figure 2. Enardo ES-850 and Enardo ES-950 Series

with Smart Wireless option

WARNING

▲

Failure to follow these instructions or to properly install and maintain this equipment

could result in an explosion, re and/or

chemical contamination causing property damage and personal injury or death.

Fisher™ pressure/vacuum relief valve must be installed, operated and maintained in accordance with federal, state and local codes, rules and regulations, and Emerson Process Management Regulator Technologies Tulsa, LLC (Emerson) instructions. These units are not designed or intended for use in mobile, high vibration or high acceleration applications.

Outside North America Only

Enardo ES-850 and Enardo ES-950 Series

Specications

The Specications section on this page provides specications for the Enardo ES-850 and Enardo ES-950 Series pressure/ vacuum relief valve. Specication is stamped on the nameplate attached to the relief valve. Refer to Product Identication and

Marking section for the nameplate details.

Available Construction

See Figures 3 and 4

Inlet Connection Sizes

2 through 12 in. / 50 through 300 mm

Pressure Ranges

(1)(2)

For sizes up to 6 in. / 150 mm

0.5 to 32 oz./sq. in.

1.0 to 55 in. w.c.

2.15 to 138 mbar 22 to 1406 mm w.c.

For sizes 8 in. / 200 mm and larger

0.5 to 24 oz./sq.in.

1.0 to 41.5 in. w.c.

2.15 to 103 mbar 22 to 1055 mm w.c.

Vacuum Pressure Ranges

(1)(2)

Vacuum Pressure Ranges

For sizes 8 in. / 200 mm and larger

0.4 to 24 oz./sq. in.

1.0 to 41.5 in. w.c.

1.72 to 103 mbar

17.6 to 1055 mm w.c.

Construction Materials

Housing: Aluminum, Stainless steel or Carbon steel Seat / Pallet: 316 Stainless steel Pallet Seal: Nitrile (NBR), Fluorinated Ethylene

(3)

Propylene (FEP), Fluorocarbon (FKM) or Fluorosilicone (FVMQ)

Hardware: Zinc-plated Carbon steel or Stainless steel Weights: Zinc-plated Carbon steel, Stainless steel

or Lead Gaskets: Nitrile (NBR), FEP, Fluorocarbon (FKM) or Fluorosilicone (FVMQ)

(1)(2)

(continued)

(3)

For sizes up to 6 in. / 150 mm

0.4 to 32 oz./sq. in.

1.0 to 55 in. w.c.

1.72 to 138 mbar

17.6 to 1406 mm w.c.

1. The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.

2. Pressure or vacuum setting has an increment of 0.5 oz./sq.in., 0.5 in. w.c. or 2.2 mbar.

3. 8, 10 and 12 in. / 200, 250 and 300 mm sizes limited to a maximum pressure relief setting of 16 oz./sq.in. / 69 mbar when a vacuum relief setting of 0.4 oz./sq. in. / 1.72 mbar is used.

Failure to correct trouble could result in a

hazardous condition. Call a qualied service

person to service the unit. Installation, operation and maintenance procedures

performed by unqualied person may result

in improper adjustment and unsafe operation. Either condition may result in equipment

damage or personal injury. Only a qualied

person shall install or service the pressure/ vacuum relief valve.

Introduction

Scope of the Manual

This Instruction Manual provides instructions for installation, maintenance and parts ordering information for the

Enardo ES-850 and Enardo ES-950 Series pressure/vacuum

relief valve (PVRV).

Product Description

Enardo ES-850 and Enardo ES-950 Series

The Enardo ES-850 and Enardo ES-950 Series pressure/

vacuum relief valves provide protection against positive or vacuum overpressure and prevent air intake and evaporative

losses of product while helping to contain odorous and potentially explosive vapors.

The Enardo ES-850 Series provides pressure and vacuum relief

in applications that require hazardous vapors to be piped away

rather than released into the atmosphere.

The Enardo ES-950 Series valve provides pressure and

vacuum relief for normal venting requirements while maintaining

a safe internal working pressure to prevent the routine expulsion of waste gas to the atmosphere.

• Model Enardo ES-850: Pressure/Vacuum Relief Valve —

Pipe-Away

• Model Enardo ES-851: Top Mount Pressure or Side

Mount Vacuum Relief Valve — Pipe-Away

• Model Enardo ES-950: Pressure/Vacuum Relief Valve —

Vent-to-Atmosphere

• Model Enardo ES-951: Pressure Relief Valve —

Vent-to-Atmosphere

• Model Enardo ES-952: Top Mount Vacuum Relief

Valve — End-of-Line

• Model Enardo ES-953: Side Mount Vacuum Relief Valve

Outside North America Only

Enardo ES-850 and Enardo ES-950 Series

Model - Inlet Size x Outlet Size - Housing Material Pallet and Seat Material Pallet Seal Material Body/Seat/Lid Seal Material -

Enardo ES-850 2 to 12 in. 3 to 14 in. 1 = Aluminum

Pressure Units Pressure Setting / Vacuum Units Vacuum Setting - Weight Material - Options

z = oz./sq.in.

n = in. w.c. mm = mm w.c. mb = mbar

0.5 to 32.0 oz./sq.in.

0.86 to 55.0 in. w.c. 22 to 1406 mm w.c.

2.2 to 138 mbar

MODEL ENARDO ES-850 PRESSURE/VACUUM RELIEF VALVE MODEL NUMBER

4 = 316SST 5 = Carbon Steel

z = oz./sq.in.

n = in. w.c. mm = mm w.c. mb = mbar

2 = 316SST 1 = FEP

0.5 to 32.0 oz./sq.in.

0.86 to 55.0 in. w.c. 22 to 1406 mm w.c.

2.2 to 138 mbar

C = CS ZP S = SST L = Lead

2 = Nitrile (NBR) 3 = Fluorocarbon (FKM) 4 = Fluorosilicone (FVMQ)

0 = No Options F = Flat Face Flange (standard for Alumunim) R = Raised Face Flange (standard for CS, SS) X = Epoxy Coating W1 = Wireless Pressure and Vacuum Monitoring W2 = Wireless Pressure Monitoring Only W3 = Wireless Vacuum Monitoring Only W4 = Wired Pressure and Vacuum Monitoring W5 = Wired Pressure Monitoring Only W6 = Wired Vacuum Monitoring Only

1 = PTFE Body and FEP

Seat/Lid

2 = Nitrile (NBR) 3 = Fluorocarbon (FKM) 4 = Fluorosilicone (FVMQ)

Model - Inlet Size - Housing Material Pallet and Seat Material Pallet Seal Material Body/Seat/Lid Seal Material

Enardo ES-950 2 to 12 in. 1 = Aluminum

Pressure Units Pressure Setting / Vacuum Units Vacuum Setting - Weight Material - Options

z = oz./sq.in.

n = in. w.c. mm = mm w.c. mb = mbar

0.5 to 32.0 oz./sq.in.

0.86 to 55.0 in. w.c. 22 to 1406 mm w.c.

2.2 to 138 mbar

4 = 316SST 5 = Carbon Steel

z = oz./sq.in.

n = in. w.c. mm = mm w.c. mb = mbar

MODEL ENARDO ES-950 PRESSURE/VACUUM RELIEF VALVE MODEL NUMBER

Figure 3. Pressure/Vacuum Relief Valve Model Number

2 = 316SST 1 = FEP

0.5 to 32.0 oz./sq.in.

0.86 to 55.0 in. w.c. 22 to 1406 mm w.c.

2.2 to 138 mbar

2 = Nitrile (NBR) 3 = Fluorocarbon (FKM) 4 = Fluorosilicone (FVMQ)

C = CS ZP S = SST L = Lead

1 = PTFE Body and FEP Seat/Lid

2 = Nitrile (NBR) 3 = Fluorocarbon (FKM) 4 = Fluorosilicone (FVMQ)

Outside North America Only

MODEL ENARDO ES-850 MODEL ENARDO ES-851 MODEL ENARDO ES-950

MODEL ENARDO ES-951 MODEL ENARDO ES-952 MODEL ENARDO ES-953

Figure 4. Enardo ES-850 and Enardo ES-950 Series Pressure/Vacuum Relief Valve Available Models

Enardo ES-850 and Enardo ES-950 Series

Table 1. Model Enardo ES-850 Weights

INLET CONNECTION OUTLET CONNECTION

In. mm In. mm Lb kg Lb kg Lb kg Lb kg

2 50 3 80 29 13 80 36 0.9 0.3 0.5 0.2

3 80 3 80 31 14 85 39 0.9 0.3 0.5 0.2

3 80 4 100 33 15 90 41 0.9 0.3 0.5 0.2

4 100 6 150 57 26 144 65 2.3 1.0 1.3 0.6

6 150 6 150 62 28 155 70 2.3 1.0 1.3 0.6

6 150 8 200 70 32 178 81 2.3 1.0 1.3 0.6

8 200 10 250 161 73 485 220 7.8 3.5 4.5 2.0

10 250 10 250 166 75 503 228 7.8 3.5 4.5 2.0

10 250 12 300 172 78 525 238 7.8 3.5 4.5 2.0

12 300 12 300 175 79 532 241 7.8 3.5 4.5 2.0

12 300 14 350 208 94 622 282 7.8 3.5 4.5 2.0

1. Unit weights indicate Net Weight of valve in pounds and kilograms at standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum). It does not include shipping crate or box.

2. Multiply the relief setting by the value shown to determine the weight of the calibration weights used to achieve the desired relief setting.

3. Values shown for calibration weights are for reference purposes only. They are not intended to be used for determination of valve relief setting.

WEIGHT

(ALUMINUM)

WEIGHT

(STAINLESS STEEL OR

CARBON STEEL)

Table 2. Model Enardo ES-950 Weights

INLET CONNECTION

In. mm Lb kg Lb kg Lb kg Lb kg

2 50 21 10 54 24 0.9 0.3 0.5 0.2

3 80 23 10 58 26 0.9 0.3 0.5 0.2

4 100 41 19 110 50 2.3 1.0 1.3 0.6

6 150 45 20 123 56 2.3 1.0 1.3 0.6

8 200 123 56 362 164 7.8 3.5 4.5 2.0

10 250 129 59 383 174 7.8 3.5 4.5 2.0

12 300 144 65 405 184 7.8 3.5 4.5 2.0

1. Unit weights indicate Net Weight of valve in pounds and kilograms at standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum). It does not include shipping crate or box.

2. Multiply the relief setting by the value shown to determine the weight of the calibration weights used to achieve the desired relief setting.

3. Values shown for calibration weights are for reference purposes only. They are not intended to be used for determination of valve relief setting.

WEIGHT

(ALUMINUM)

WEIGHT

(STAINLESS STEEL OR

CARBON STEEL)

(1)

WEIGHT OF CALIBRATION WEIGHTS REQUIRED TO

ACHIEVE DESIRED RELIEF SETTING

Weight per oz/sq. in. Weight per in. w. c.

(1)

WEIGHT OF CALIBRATION WEIGHTS REQUIRED TO ACHIEVE

Weight per oz/sq. in. Weight per in. w. c.

DESIRED RELIEF SETTING

(2)(3)

Smart Wireless Monitoring Option

WARNING

▲

The surface resistivity of the antenna assembly when the optional transmitter

is installed is greater than 1 GΩ. To avoid

electrostatic charge build up, it must not be rubbed or cleaned with solvents or dry cloth.

The Smart Wireless Monitoring Option is available with PVRV Models Enardo ES-850 (Pipe-away) and Enardo ES-950 (Vent-to-atmosphere). This option allows the

remote sensing and “OPEN/CLOSED” value transmission

of the open or closed status of the pressure vent, the vacuum vent or both. Use Option Code WP for pressure vent monitoring, Option Code WV for vacuum vent monitoring or WPV for the monitoring of both at the end of the model string. Knowing whether a PVRV is open or closed can enable immediate response to prevent problems related to

safety, emissions and quality of the tank contents.

The following are a few specic examples of how this added

visibility can help prevent problems:

Example #1 – Redundant PVRV’s

Redundant PVRV’s are commonly used for added safety. If the primary PVRV fails closed or partially-closed, then the backup PVRV automatically takes over. This is achieved by establishing a pressure set point that is slightly higher for the backup device. In this way, if the primary PVRV fails, the tank remains protected. But redundancy is lost and should be addressed as soon as possible. But how will you know

if this has occurred? Monitoring the open/closed position of the backup PVRV can provide quick identication of this

issue, for either the pressure or vacuum side. Under normal conditions, the backup PVRV remains closed. If the backup PVRV is open, this points to either the primary PVRV not functioning as expected or a separate pressure control problem in the tank system that is causing both PVRV’s to be open. Ideally, the wireless monitoring of both primary and backup devices is preferred in order to gain the most insight.

Outside North America Only

Enardo ES-850 and Enardo ES-950 Series

PRESSURE FLOW

Figure 5. Pressure and Vacuum Flow

Further troubleshooting can then be performed and the problem can be detected and addressed.

Example #2 – Tank Blanketing

Tank blanketing is sometimes used in order to inert the vapor space in a tank for added safety. A tank blanketing regulator

controls the inow of nitrogen or another blanketing gas

by responding to a low pressure set point. In this scenario, a PVRV (vacuum side) generally acts as a backup to the blanketing regulator. If the blanketing system fails for some reason, the PVRV automatically takes over, as its set point is slightly higher than that of the regulator. But once again, how is one to know that this has occurred? A wireless-monitored PVRV would indicate that the vacuum side is open. Under normal operation, it should be closed.

Example #3 – Emergency Vent

A storage tank’s emergency vent should remain closed, except in abnormal conditions. If an emergency vent is also remotely monitored, and found to be open, then there may be a pressure control issue somewhere in the system. In this scenario, the PVRV should also be open. If it is not, it could be part of the issue. Again, a wireless-monitored PVRV can readily provide this information.

Product Identication and Marking

CAUTION

△

VACUUM FLOW

Hazardous Locations

Fisher™ pressure/vacuum relief valves are available with

outer housings of carbon steel, stainless steel or aluminum, as indicated in Figure 5.

Nameplate

A nameplate is attached to the valve and contains the following information:

• Model Number – Ex. VALVE, Enardo ES-950-4-1211

• Conn. Flange Size and Rating – Ex. 4 in.

• Serial Number

• Tag Number (Optional)

• Year – Ex. 08

Principle of Operation

Enardo ES-850 and Enardo ES-950 Series

The Enardo ES-850 and Enardo ES-950 Series pressure/

vacuum relief valves maintain a tight seal until system pressure or vacuum exceeds the set pressure of the valve. Set pressure is determined by stacking a series of weights onto the valve pallet unless the pressure and vacuum set

points have been specied for the minimum settings. When

overpressure occurs, the weighted pallet lifts, breaking the seal between the seat and pallet. This allows vapors to pass

through the valve orice and relieve pressure buildup. The

valve reseals upon relief and remains sealed.

Outside North America Only

As part of the legacy Model Enardo 850/

Enardo 950 ATEX certication, an

ignition risk analysis was performed. Grounding of the unit is not deemed to be necessary because all conducting parts of the equipment are arranged such that

a dangerous potential di󰀨erence cannot

exist between them. However, grounding or bonding allowances can be made at user request if internal, local or national codes or standards require.

It is important to know that relieving vapors near the set pressure in a continuous manner may cause the pallet to

utter or oscillate inside the valve chamber. This is common to products of this type. Operating the valve with utter or

oscillation may cause premature valve damage or wear over

time. Fisher pressure/vacuum relief valve ow charts and sizing program results designate the “utter zone” to assist with correct valve sizing. Contact your local Sales O󰀩ce with any questions or additional assistance.

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