Emerson FISHER T208 Series 사용 설명서 - 페이지 2

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T208 Series

Specifications

The Specifications section on this page provides the ratings and other specifications for the T208 Series. Factory

specification such as type, maximum inlet pressure, maximum temperature, maximum outlet pressure, spring

range and orifice size are stamped on the nameplate fastened on the regulator at the factory.

Product Configurations

Type T208: Tank Blanketing Vapor Recovery

regulator with control pressure range of 2 in. w.c.

to 7 psig / 5 mbar to 0.48 bar in six different spring

ranges and has internal pressure registration

requiring no control line.

Type T208M: Similar to Type T208 but has a

blocked throat and a control line connection for

external pressure registration.

Body Sizes and End Connection Styles

See Table 1

Maximum Allowable Inlet (Casing) Pressure

See Table 1

Maximum Outlet Pressure

35 psig / 2.4 bar

Maximum Emergency Inlet Pressure to Avoid

Internal Parts Damage

With Nitrile (NBR) or Fluorocarbon (FKM)

diaphragm: 35 psig / 2.4 bar

With Fluorinated Ethylene Propylene (FEP)

diaphragm: 10 psig / 0.69 bar

Control Pressure Ranges

See Table 2

Shutoff Classification per ANSI/FCI 70-3-2004

Class VI (Soft Seat)

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

2. See Table 4 for operating temperature ranges for available trim combinations.

3. Special low temperature constructions for process temperatures between -76 to 180°F / -60 to 82°C are available by request. The low temperature construction passed Emerson

laboratory testing for lockup and external leakage down to -76°F / -60°C.

Product Description

The T208 Series vapor recovery regulators are

direct-operated. They are used to sense an increase

in vessel pressure and vent excessive internal vessel

pressure to an appropriate vapor recovery disposal

or reclamation system. They may also be used as

backpressure regulators or relief valves.

Type T208—The Type T208 has internal registration

requiring no control line.

Type T208M—The Type T208M has a blocked throat

and a control line connection for external registration.

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Pressure Registration

Type T208: Internal

Type T208M: External

Material Temperature Capabilities

Elastomer Parts

Nitrile (NBR): -40 to 180°F / -40 to 82°C

Fluorinated Ethylene Propylene (FEP):

-20 to 180°F / -29 to 82°C

Fluorocarbon (FKM): 40 to 300°F / 4 to 149°C

Ethylene Propylene Diene (EPDM):

-20 to 225°F / -29 to 107°C

Perfluoroelastomer (FFKM): 0 to 300°F /

-18 to 149°C

Body Materials

Gray cast iron: -20 to 300°F / -29 to 149°C

WCC Carbon steel: -20 to 300°F / -29 to 149°C

LCC Carbon steel or CF8M/CF3M

Stainless steel: -40 to 300°F / -40 to 149°C

Spring Case Vent Connection

1/4 NPT

Diaphragm Case Control Line Connection

(Type T208M)

1/2 NPT

Approximate Weight

17.7 lbs / 8 kgs

Principle of Operation

The T208 Series vapor recovery regulators are used

to maintain a constant inlet (blanket) pressure with

the outlet flowing to a system whose pressure is

lower than that at the inlet. When vessel pressure

increases above the setpoint of the regulator due

to pumping in or thermal heating, the force of the

control spring is overcome by pressure acting on

the diaphragm. This moves the disk away from

the orifice, allowing gas to flow from the vessel to

the vapor recovery system. As vessel pressure is

reduced, the force of the back disk spring causes the

disk to move toward the orifice, decreasing the flow of

gas out of the vessel. As vessel pressure drops below

the setpoint of the regulator, the disk will seat against

the orifice, shutting off the gas flow.

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