Emerson S200 Instruction Manual

Instruction Manual Form 2216

December 2008

S203 Series Relief Monitor Regulators

S203 Series

W2109

Figure 1. Type S203 Relief Monitor Regulator

WARNING

Fisher® regulators must be installed, operated, and maintained in accordance with federal, state, and local codes, rules and regulations, and Fisher instructions.

If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition.

Call a gas service person to service

the unit. Only a qualied person must

install or service the regulator.

Introduction

Scope of Manual

This instruction manual provides instructions and a parts list for the S203 Series relief monitor regulators.

Description

The S203 Series allows single-unit overpressure protection. The regulators also minimize the venting of large volumes of gas to the atmosphere.

Type S203—Spring-loaded regulator with open throat construction that gives internal registration of downstream pressure. Outlet pressure is from 2 to

30-inches w.c. (5 to 75 mbar) in ve ranges.

Type S203H—Same as Type S203 but with outlet pressure from 1 to 3.25 psig (0,07 to 0,22 bar) in two ranges.

Type S203P-1—Spring loaded regulator with blocked throat and blocked pitot tube construction for use with a downstream control line.

Type S203P-2—Same as Type S203P-1 but with stem seal O-ring for positive seal.

Type S203P-3—Same as Type S203P-1 but with stem seal O-ring and wiper ring for dirty gas applications.

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D400010X012

S203 Series

Specications

Body Sizes and End Connection Style

1-1/2, 1-1/2 x 2, or 2-inch body with NPT connections

Maximum Allowable Inlet Pressure (Body Rating)

See Table 3

Maximum Allowable Casing Pressure

15 psig (1,0 bar) casing pressure

Maximum Operating Outlet Pressure to Avoid Internal Part Damage

Light Diaphragm Plate: 2 psi (0,14 bar) above

outlet pressure setting Heavy Diaphragm Plate: 3 psi (0,21 bar) above outlet pressure setting

Point Where Relief/Monitor Functions

Approximately 7-inches w.c. to 1 psig (17 mbar to 0,07 bar) over outlet setting

1. The pressure/temperature limits in this instruction manual or any applicable standard limitation should not be exceeded.

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Specications

The Specications section list the specications for the

S203 Series. The following information is stamped on the regulator at the factory: type number, date of manufacture, outlet pressure range, port (seat ring) size, monitor spring part number, and monitor spring range.

Principle of Operation

The following describes operation through internal registration as shown in Figure 3. A unit with a downstream control line operates the same except that the throat and pitot tube are blocked, and a downstream control line is tapped into the lower casing and the monitor spring case.

Downstream pressure registers under the main regulator diaphragm through the turbo-booster tube in the throat and on the monitor diaphragm assembly through the pitot tube. Inlet pressure registers on both sides of the monitor piston through a registration hole in the center resulting in balanced operation. Thus, under

normal conditions, as downstream pressure uctuates

due to load changes the main regulator disk and monitor piston both move toward or away from the seat ring.

If the downstream pressure reaches overpressure conditions (7-inches w.c. to 1 psig (17 mbar to 0,07 bar)) above the outlet pressure setting — depending on the main regulator spring), the internal relief valve opens. At the same time, downstream pressure on the monitor diaphragm moves the monitor piston closer to the seat ring restricting the port. This minimizes or prevents

Outlet Pressure Ranges

2-inches w.c. to 3.25 psig (5 mbar to 0,22 bar)

Seat Ring Port Diameters

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1/4, 3/8, 1/2, 3/4, 1, and 1-3/16-inches (6,4; 9,5; 13; 19; 25; and 30 mm)

Temperature Capabilities

–20° to 170°F (–29° to 77°C)

Pressure Registration

Types S203 and S203H: internal Type S203P: downstream control line

Approximate Weight

27 pounds (12 kg)

further ow through the port, enabling the relief valve to

relieve the downstream overpressure conditions.

The combination of the restriction in the relief valve (key 94, Figure 4) and the positioning of the monitor piston near the inlet side of the seat ring limits the

maximum downstream pressure and the related ow

through the relief valve to the values indicated in Table 1. As downstream pressure drops back to normal, the relief valve closes and the monitor piston moves away from the seat ring automatically restoring normal operation.

Installation

Personal injury or system damage may result if this regulator is installed, without appropriate overpressure protection, where service conditions could exceed the limits given in the

Specications section. Regulator

installations should be adequately protected from physical damage.

All vents should be kept open to permit

free ow of gas to the atmosphere.

Protect openings against entrance of rain, snow, insects, or any other foreign material that may plug the vent or vent line. On outdoor installations, point the spring case and monitor casing vent downward to allow condensate to

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WARNING

TYPE NUMBER

S203, S203P

S203H/

S203P

S203 Series

Table 1. Maximum Downstream Pressure Build-up and Relief Valve Flow

RELIEF MONITOR

SPRING PART

NUMBER

(COLOR CODE)

1L255727132

(Green)

1L255827132

(Red)

1L255927132

(Blue)

1V224227012 0.5 to 1.0 psig (0,03 to 0,07 bar) 3.0 (0,21) 0 2200 (59)

1V224227012

(Silver)

OUTLET PRESSURE RANGE,

INCHES W.C. (mbar)

Up to 5 (Up to 12) 0.8 (0,05) 0 950 (26)

4 to 9.5 (10 to 24) 1.0 (0,07) 1 1000 (27)

8 to 14 (20 to 35) 1.25 (0,09) 2 1200 (32)

8 to 12 (20 to 30) 1.4 (0,10) 0 1350 (36)

10 to 20 (25 to 50) 1.8 (0,12) 1 1600 (43)

14 to 28 (35 to 70) 2.8 (0,19) 2 1900 (51)

11 to 21 (27 to 52) 2.2 (0,15) 0 1800 (48)

18 to 33 (45 to 82) 3.0 (0,21) 1 2000 (54)

28 to 45 (70 to 112) 3.8 (0,26) 2 2200 (59)

0.75 to 1.6 psig (0,05 to 0,11 bar) 4.0 (0,28) 1 2500 (67)

1.25 to 2.25 psig (0,09 to 0,16 bar) 5.0 (0,35) 2 3000 (80)

1.25 to 3.25 psig (0,09 to 0,22 bar) 6.0 (0,41) 3 3000 (80)

MAXIMUM

DOWNSTREAM

PRESSURE BUILD-UP,

PSIG (bar)

NUMBER

OF LOWER

SPRING SEATS

REQUIRED

MAXIMUM FLOW

THROUGH RELIEF

VALVE, SCFH (Nm3/h) OF

0.6 SPECIFIC GRAVITY NATURAL GAS

Table 2. Main Spring Pressure Ranges

TYPE

NUMBER

S203,

S203P

S203H/

S203P

SPRING RANGE,

INCHES W.C. (mbar)

2 to 4.5

3.5 to 6.5 5 to 9

8.5 to 18 14 to 30

1 to 2 psig

1.5 to 3.25 psig

(5 to 11) (9 to 16) (12 to 22) (21 to 45) (35 to 75)

(0,07 to 0,14 bar) (0,10 to 0,22 bar)

SPRING PART

NUMBER

1D892527022 1D892627022 1D892727012 1D893227032 1D893327032

1H975827032 1H975927032

COLOR

CODE

Brown

Red

Silver

Grey

Dark Green

Dark Blue

Orange

Table 3. Inlet Pressures

SEAT RING DIAMETER,

INCHES (mm)

1/4

(6,35)

3/8

(9,53)

1/2

(12,7)

3/4

(19,1)

(25,4)

1-3/16

(30,2)

Table 4. Maximum Outlet Pressure Setting

TYPE NUMBER MAXIMUM OUTLET PRESSURE

S203 or S203P 30-inches w.c. (75 mbar)

S203H/S203P 3.25 psig (0,22 bar)

1. Maximum emergency outlet (casing) pressure for S203 Series is 15 psig (1,03 bar).

MAXIMUM INLET PRESSURE, PSIG (bar)

Types S203, S203P Type S203H

125 125 100

60 25 13

(8,6) (8,6) (6,9)

(4,1) (1,7) (0,90)

125 125 100

60 30 14

(8,6) (8,6) (6,9)

(4,1) (2,1) (0,97)

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drain (see Figure 2). This minimizes the possibility of freezing and of water or other foreign materials entering the vent and interfering with proper operation.

Under enclosed conditions or indoors, escaping gas may accumulate and be an explosion hazard. In these cases, the vents should be piped away from the regulator to the outdoors.

VENT

POINT VENT DOWN

A4196

VENT

Figure 2. Various Vent Positions

CAUTION

Like most regulators, S203 Series regulators have an outlet pressure rating lower than their inlet pressure rating. Overpressuring any portion of the regulators beyond the limits in Tables 3 and 4 may cause leakage, damage to regulator parts, or personal injury due to bursting of pressure-containing parts.

If the regulator is exposed to an overpressure condition, it should be inspected for any damage that may have occurred. Regulator operation below these limits does not preclude the possibility of damage from external sources or from debris in the pipeline.

S203 Series

Before installing the regulator, check for damage which might have occurred in shipment. Also check for dirt or foreign matter which may have accumulated in the regulator body or in the pipeline. Apply pipe compound to the male threads of the pipeline and install the

regulator so that ow is in the direction of the arrow cast

on the body. The diaphragm casing assembly can be rotated to any position relative to the body. Loosen the two cap screws holding the union ring (key 18, Figure 4) in order to rotate the diaphragm casing assembly.

Do not install the regulator in a location where there can be excessive water accumulation, such as directly beneath a downspout.

The regulator vent is 1-inch FNPT and the monitor vent is 1/4-inch FNPT. The vent openings are screened to prevent insects from entering. On outdoor installations, the vent opening must be pointing down, see Figure 2, for protection against the elements and to allow condensate to drain.

Indoor installations require a separate vent line be run from each vent to a safe outdoor location. The vent lines should be of as large diameter pipe as practical with a minimum number of bends. Remove the vent screen when attaching the piping to the vent. A weather resistant vent assembly, such as Fisher® Type Y602, should be installed at the end of each vent piping with the vent assembly opening pointing down. The vent assembly should be in a protected location as explained above for regulators installed outdoors.

A program of regular inspection of the vent opening should be established to see that it has not become plugged by foreign material. On some installations, such as in areas of heavy snowfall, it may be necessary to install the regulator beneath a protective hood. If other protection is provided from the elements,

the vent should be pointing or sloping down sufciently

to allow any condensate to drain.

It is advisable that the downstream piping be the same size as the regulator outlet for a minimum distance of 18-inches (457 mm) or to the meter inlet. Replace the regulator if water gets into the spring case or the lower casing to the regulator.

Downstream Control Line

The Types S203P-1, -2, and -3 units must be installed with an external downstream control line. Install the control line before putting the regulator into operation or the regulator will remain wide-open. The downstream control line should be pipe of at least 1/2-inch (13 mm) diameter and connected to a straight section of outlet piping 5 to 10 pipe diameters downstream of the regulator. A hand valve should be installed in this

section of the control line. This hand valve can be throttled down to dampen out pulsations which may cause instability or cycling of the regulator. However, the control line hand valve must never be closed completely during operation. Since the throat is blocked to isolate the main diaphragm and a sealing screw (key 99, Figure 5) in the pitot tube isolates the monitor diaphragm, install a tee in the control line between the regulator and the hand valve. Then run one line from the tee to the connection in the lower casing assembly which is tapped in the S203P Series and another line from the tee to the tapped connection (key 46, Figure 4) in the monitor spring case.

Startup

CAUTION

Pressure gauges should always be used to monitor downstream or control line pressures during startup. Downstream or control line pressure must never exceed the setpoint (dictated by the spring setting) by more than 2 psi (0,14 bar) (light diaphragm plate) or 3 psi (0,21 bar) (heavy plate). If it does, the valve seat and/or diaphragm plate may be damaged. Procedures used in putting the regulator into operation must be planned accordingly if the downstream system is pressurized by another regulator or by a manual bypass.

If the downstream system is not pressurized by another regulator or manual bypass valve, use the following procedure:

1. Open the hand valve in the control line (Type S203P-1, -2, or -3).

2. Slowly open the upstream shutoff valve.

3. Slowly open the downstream shutoff valve.

4. If the regulator (with a downstream control line) has a tendency to pulsate, throttle down the hand valve in the control line, but never close it completely while the regulator is in operation.

5. Check all connections for leaks.

6. Light the appliance pilots.

Adjustment

To increase the outlet pressure setting of the regulator, compress the main spring (key 2, Figure 4) by removing the closing cap (key 4, Figure 4) and turning the adjusting

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