ENVIRONMENTAL CONTROL PL ANS

www.chestertonrotating.comForm. EN23873 03/15

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Environmental Control Plans

PLAN 2Cooling Jacketn Use with single seal or dual seal

to control seal chamber temperature

n Maintains or elevates box temperature to prevent product solidification with polymers, resins, tars

n Lowers seal chamber temperature in hot environments

n Common heat transfer fluids: – Water – Thermal oils – Steam

n Close tolerance throat bushing is required for optimum efficiency

PLAN 11Discharge Recirculationn Use with single seal or dual seal

n Increases circulation

n Increases pressure in seal chamber

n Clean fluids only – Solids can erode seal

n An orifice can be used to reduce flow and pressure

n Close tolerance throat bushing is required for optimum efficiency, but is optional in slurry applications

Environmental Control Plans

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PLAN 12Discharge Recirculation with Strainern Use with single seal

n Cools seal

n Increases pressure in seal chamber – Throat bushing optional

n Clean fluids only – Solids can erode seal – Solids can clog seal when

bushing is used

n An orifice can be used to reduce flow and pressure

PLAN 13Suction Recirculationn Vents air and prevents dry run

n Prevents clogging

n Lowers pressure in seal chamber

n Cools seal

n Reduces seal-generated heat

n Use caution with low vapor pressure liquids

PLAN 14Suction and Discharge Recirculation (Vertical)n Vents air and prevents dry run

n Use with single seal or dual seal

n Prevents clogging

n Cools seal

n Promotes flow

n Reduces seal-generated heat

n Use caution with low vapor pressure liquids

PLAN 21Cooled Discharge Recirculationn Use with a single seal

n Cools hot, volatile fluids

n Cools seal

n Increases seal chamber pressure

n An orifice can be used to control flow and reduce pressure

n Use with close tolerance throat/restric-tion bushing

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Environmental Control Plans

PLAN 23Cooled Seal Recirculationn Use with a single seal and pump

mechanism

n Minimizes heat exchanger size and cool-ant water usage

n Cools seal while pumping hot and/or volatile fluids

n Use with close tolerance throat/restriction bushing

n Venting is important

PLAN 31Discharge Recirculation with Cyclone Separatorn Use with a single seal where fluid

contains some abrasives

n Cools seal

n Increases seal chamber pressure

n Density of solids must be significantly greater than fluid

n Use caution with high viscosity fluids

n Requires pressure differential

n Will not remove micron-size particles

CCW ROTATION

CW ROTATION

Environmental Control Plans

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PLAN 32Clean Flushn Use with a single seal

n Provides clean fluid to seal

n Prevents clogging

n Acceptable flush fluids – Clean, compatible fluid – Water, if compatible – Clean product – Downstream additive – Carrier solvent

PLAN 33HSpiralTrac™ Version D Type In Use with a single seal

n Removes solids

n Seal runs in clean fluid

n Prevents clogging

n Removes vapor from seal chamber

n Prevents dry running

n No flush required

SpiralTrac is a trademark of EnviroSeal Engineering Products Limited.

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Environmental Control Plans

SpiralTrac is a trademark of EnviroSeal Engineering Products Limited.

PLAN 33SSpiralTrac™ Version F Type Sn Use with a single seal

n Removes solids

n Seal runs in clean fluid

n Prevents clogging

n Prevents dry running

PLAN 41Cooled Discharge Recirculation with Cyclone Separatorn Use with a single seal where fluid

contains some abrasives

n Cools seal

n Increases seal chamber pressure

n Supplies cleaner fluid

n Reduces clogging potential

n Density of solids must be significantly greater than fluid

n Use caution with high viscosity fluids

n Requires pressure differential

n Will not remove micron-size particles

Environmental Control Plans

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PLAN 52Circulation with External Buffer Fluid Tankn Use with a dual seal

n Low pressure buffer fluid, 0,7 bar g (10 psig) minimum

n Buffer fluid should be clean, compatible and lubricating

n Buffer fluid pressure lower than seal chamber pressure

n Seal venting is important

n Use long sweeps in tubing bends

PLAN 53ACirculation with Pressurized External Barrier Fluid Tankn Use with a dual seal

n Pressurize barrier fluid 1 - 2 bar g (15 - 30 psig) over maximum seal chamber pressure

n Barrier fluid should be clean, compatible and lubricating

n Provides clean fluid to the inboard seal faces

n Use long sweeps in tubing bends

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Environmental Control Plans

PLAN 53BClosed Loop with Heat Exchanger and Accumulatorn Use with dual seals

n Optional thermocouple

n No foaming

n Heat is removed by an air-cooled or water-cooled heat exchanger

n Accumulator sizing crucial

n Maintains constant pressure on the circulation system

PLAN 53CHeat Exchanger and Piston Accumulatorn Optional thermocouple

n No foaming

n Heat is removed by an air-cooled or water-cooled heat exchanger

n Tracks product pressure in seal chamber

n Maintains constant pressure on the circulation system

Environmental Control Plans

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PLAN 53PCirculation with Pressurized External Barrier Fluid Tankn Maintains constant pressure and liquid

supply to the dual seal

n External water pressure is set at 2 bar g (30 psig) over maximum seal chamber pressure

n Initial tank level is set through the external water pressure line

n Pressurize tank to 1,7 bar g (25 psig) over maximum seal chamber pressure with a regulated gas pad, then isolate gas pressure

n Tank is then charged with regulated external water pressure

n System operates with a constant exter-nal water pressure

PLAN 54DMCirculation with Pressurized External Barrier Fluid Source and Flow Guardian™ DP50n Use with a dual seal

n Pressurize barrier fluid 15 - 30 psig (1 - 2 bar g) over maximum seal chamber pressure

n DP50 provides inboard seal leak detection, pressure regulation and flow control

n Barrier fluid should be clean, compatible and lubricating

n Provides clean fluid to inboard seal faces

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Environmental Control Plans

PLAN 62Quenchn Use with a single seal

n Prevents coking, crystallization

n Use low pressure only

n Cleans atmospheric side of seal faces

n Common quench fluids: – steam – water – nitrogen

PLAN 74Externally Supplied Barrier Gasn Use with a non-volatile gas

n Provide gas at 1,7 bar g (25 psig) above seal chamber pressure

n Venting of the seal chamber may be required prior to start-up

n Use nitrogen, carbon dioxide or compressed air

n Zero emissions and leakage to atmosphere

Environmental Control Plans

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