Michell Instruments Promet EExd Manual de instrucciones

PROMET EExd

Process Moisture Analyzer Sampling

Systems

Installation, Operation &

Maintenance Manual

97095 Issue 03, August 2009

Welcome

Thank you for choosing your Michell

Instruments dew-point instrument

from The Dew Point Specialists. All

Michell‟s products are designed and

manufactured to meet Michell‟s

rigorous specifications and world-

class quality standards. During

development, our laboratory testing

team took your instrument through

a rigorous testing process to ensure

that it will deliver outstanding

performance time and time again.

We are confident that the dew-point

instrument you have purchased

from Michell Instruments will meet

your own exacting standards.

Michell Instruments Ltd,

Lancaster Way Business

Park

Ely, Cambridgeshire

CB6 3NW

United Kingdom

Tel: +44 (0)1353 658000

______________________________________________________________________

www.michell.com

CONTENTS

CONTENTS............................................................................................................................................................... 3

1. OVERVIEW.......................................................................................................................................................... 4

1.1 Manufacturing Quality .............................................................................................................................. 8

2. INSTALLATION................................................................................................................................................... 9

2.1 Gas Connections...................................................................................................................................... 11

2.2 Power Supply Connection ...................................................................................................................... 11

2.3 Output Wiring Connections.................................................................................................................... 12

3. OPERATION...................................................................................................................................................... 14

3.1 Start-Up Procedure ................................................................................................................................. 15

3.2 Shut-Down Procedure ............................................................................................................................ 15

4. OPTIONS........................................................................................................................................................... 16

4.1 Enclosure Heater Temperature Control ............................................................................................... 16

4.2 Trace Heated Sample Line..................................................................................................................... 17

4.3 Enclosure Cooling.................................................................................................................................... 17

5. MAINTENANCE................................................................................................................................................. 18

5.1 Membrane Filter Element Replacement............................................................................................... 18

5.2 Glycol Absorption Cartridge Replacement ........................................................................................... 18

5.3 Particulate Filter Element Replacement............................................................................................... 19

6. TECHNICAL SPECIFICATION.......................................................................................................................... 21

APPENDIX A CONTACT DETAILS .................................................................................................................... 22

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

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1. OVERVIEW

The PROMET EExd Sampling Systems are designed for continuous on-line measurement

and monitoring of the moisture content of a hydrocarbon gas. The sampling systems can

be located close to the process gas sample take-off point in a potentially explosive

environment designated zone 1 hazardous area.

PROMET Process Moisture Analyzer Sampling Systems are specifically designed for the

measurement of moisture content in Natural Gas. The systems are configured with the

necessary filtration, pressure letdown and flow control required for measurements at

pressure before finally venting to an atmospheric or a low pressure flare line system. A

fast-loop bypass flow arrangement is included to reduce sample flow response time lag

and enabling the filter to be drained automatically of any potential hydrocarbon liquids

and hydrates formed.

Two separate series of sampling systems are available; one designed for the

requirements of Trace Moisture applications such as molecular sieve drying at LPG

plants and one for the more general moisture measurements in Natural Gas from

processing through pipeline transmission. Each of these systems can also be supplied

as either 1 or 2 channel systems. The more general Natural Gas systems are supplied

with triple filtration consisting of particulate and membrane filter and glycol absorption.

For systems intended to measure Trace Moisture levels, single filtration is provided that

consists of a stainless steel mesh particulate filter.

The sampling systems gas handling components are supplied mounted on a chassis

panel that can be fitted within a stainless steel insulated enclosure. The enclosure

provides environmental protection to IP66 and fitted with mounting brackets suitable

for wall mounting.

Sampling systems fitted within enclosures are temperature controlled to maintain a

constant temperature environment of at least 10 oC above the highest envisaged dew

point temperature independent of surrounding temperature variations. The temperature

control system consists of a heater controlled by a fixed preset thermostat to provide

internal ambient air temperature control of >15 oC. For higher temperature control,

systems can be supplied with a heater controlled by an adjustable setpoint thermostat

to achieve internal ambient air temperature control up to 60 oC for maintaining more

stable measurement conditions for installations in adverse climates.

All sample gas wetted metallic parts in AISI 316L stainless steel with Viton soft parts

that comply with the NACE standard MR-01-75 (latest edition). Tube fittings are twin

ferrule compression type. All gas and cable entries are located in the base of the

enclosure.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

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Sampling systems can be supplied in various configurations/options:

Indoor (chassis panel mounted)

Outdoor (304/316 stainless steel enclosure)

1 or 2 channels

Standard operating pressure (69 barg (1000 psig))

High operating pressure (138 barg, (2000 psig))

Enclosure heating (fixed/adjustable control)

Enclosure cooling (adjustable control)

Trace heated sample line

Sample System gas handling components comprise of the following:

Gas Inlet Isolation Valve(s)

(BV1 for 1 channel):

(BV4 for 2 channel): Allows user to manually isolate the system from

the process sample gas supply line for

maintenance or servicing.

Filter(s)

Natural Gas systems

(F1 for 1 channel):

(F4 for 2 channel): Provides protection from contamination of

particulate matter down to 60 microns using a

stainless steel sinter filtration.

Natural Gas systems

(F1 for 1 channel):

(F5 for 2 channel): Provides protection from contamination of

liquid carry-over of hydrocarbon mist particles

using membrane filtration.

Natural Gas systems

(F3 for 1 channel):

(F6 for 2 channel): Provides protection from contamination of

glycol vapour using a “Glysorb” ™ absorption

cartridge.

Trace Moisture systems

(F1 for 1 channel):

(F2 for 2 channel): Provides protection from contamination of

particulate matter down to 5 microns using a

stainless steel mesh filtration.

Line Pressure Gauge(s)

(PG1 for 1 channel):

(PG2 for 2 channel): Indicates the sample gas line pressure.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

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Process Moisture Analyzer:

(PROMET EExd): Provides measurement and output of moisture

content of the sample gas (1 or 2 channels).

Sample Flow Letdown

Pressure Regulator(s)

Natural Gas systems

(PR1/PR2 for 1 channel):

(PR5/PR6 for 2 channel): Provides pressure letdown from line pressure to

a lower vent pressure. Standard version has 1

stage of pressure letdown. High pressure

version has 2 stages of pressure letdown.

Trace Moisture systems

(PR1/PR2 for 1 channel):

(PR3/PR4 for 2 channel): Provides pressure letdown from line pressure to

a lower vent pressure. Standard version has 1

stage of pressure letdown. High pressure

version has 2 stages of pressure letdown.

Non Return Valve(s)

Natural Gas systems

(NRV1 for 1 channel):

(NRV3 for 2 channel): Provides protection for the system from

backpressure of vent gas when sample gas is

not flowing.

Trace Moisture systems

(NRV1 for 1 channel):

(NRV2 for 2 channel): Provides protection for the system from

backpressure of vent gas when sample gas is

not flowing.

Sample Flowmeter & Valve(s)

Natural Gas systems

(FM1 for 1 channel):

(FM3 for 2 channel): Allows the user to manually set and indicate

the sample gas flowrate across the moisture

analyzer dew point sensor.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

____________________________________________________________

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Trace Moisture systems

(FM1 for 1 channel):

(FM2 for 2 channel): Allows the user to manually set and indicate

the sample gas flowrate across the moisture

analyzer dew point sensor.

Gas Outlet Isolation Valve(s)

(BV2 for 1 channel):

(BV5 for 2 channel): Allows the user to manually isolate the system

from the gas vent line for maintenance or

servicing.

Gas Letdown Vent Isolation Valve(s)

(BV3 for 1 channel):

(BV6 for 2 channel): Allows the user to manually letdown any

sample gas pressure within the system

(depressurise to atmosphere) for maintenance

or servicing.

Bypass flow gas handling components (Natural Gas systems only) comprise of the

following:

Bypass Flow Letdown

Pressure Regulator(s)

(PR3/PR4 for 1 channel):

(PR7/PR8 for 2 channel): Provides pressure letdown from line pressure to

a lower vent pressure. Standard version has 1

stage of pressure letdown. High pressure

version has 2 stages of pressure letdown.

Non Return Valve(s)

(NRV2 for 1 channel):

(NRV4 for 2 channel): Provides protection for the system from

backpressure of vent gas when sample gas is

not flowing.

Bypass Flowmeter & Valve(s)

(FM2 for 1 channel):

(FM4 for 2 channel): Allows the user to manually set and indicate

the bypass gas flowrate across the membrane

filter.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

____________________________________________________________

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1.1 Manufacturing Quality

Your sampling system should reach you in perfect working condition. Michell

Instruments are registered with the British Standards Institute for Quality Assurance to

BS EN ISO 9001: 2000.

We have rigorous procedures at every stage of production to ensure that the materials

of construction, manufacturing, calibration and final test procedures meet the

requirements laid down by our Quality System which is approved by BSI.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

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2. INSTALLATION

Sampling Systems are assembled onto a panel for indoor installations or in a stainless

steel enclosure for outdoor installations. All are suitable for wall mounting.

When an outdoor system is supplied the internal insulation and temperature control

circuits allow the sampling system to be positioned outside at a point as close to the

sample gas take-off point as possible so minimising sample line response time lag in a

designated zone 1 hazardous area.

The enclosures provide environmental ingress protection to IP66 and should be

mounted vertically and free of any appreciable vibration in a permanently shaded

position to prevent heating effects through sun radiation.

PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide

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M8 MOUNTING

HOLES

735

695

715

770

1 CHANNEL PANEL

3mm DOUBLE

BIT LOCKS

1 CHANNEL ENCLOSURE

M10 MOUNTING

HOLES

760

800

850

800

M8 MOUNTING

HOLES

919

869

894

963

2 CHANNEL P ANEL

3mm DOUBLE

BIT LOCKS

2 CHANNEL ENCLOSURE

M10 MOUNTING

HOLES

950

100 0

1050

1000

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