Teledyne 701H User manual

OPERATION MANUAL

MODEL 701H

HIGH PERFORMANCE

ZERO AIR GENERATOR

9480 CARROLL PARK DRIVE

SAN DIEGO, CA 92121-5201

USA

Toll-free Phone: 800-324-5190

Phone: 858-657-9800

Fax: 858-657-9816

Email: [email protected]

Website: http://www.teledyne-api.com/

Teledyne Advanced Pollution Instrumentation 08 December 2010

06712B (DCN5875)

i

ABOUT THIS MANUAL

This M701H High Performance Zero Air Generator operation manual is comprised of multiple

documents as listed below.

Part No. Rev Name/Description

06712 B Operation Manual

04825 F

List, Spare Parts (in Appendix A) Note: due to the dynamic nature of this document,

please check our Website or with Sales for most recent version.

07346 A List, Recommended Spares Stocking Levels (RSSL) (in Appendix A)

07344 A Expendables Kit (in Appendix A)

07345 A Level 1 Spares Kit

06619 B Schematic, Controller Board (in Appendix B)

NOTE

We recommend that this manual be read in its entirety before any attempt is made

to operate the instrument.

REVISION HISTORY

M701H Manual 06712

2010 November 5, Rev B, per DCN , with the following documents

Document P/N Rev DCN Change Summary

Operation Manual 06712

B 5875

 Replaced pressure switch with pressure

sensor.

 Replaced controller with new.

 Updated hydrocarbon scrubber content.

 Added Section on Electro-static

Discharge

Schematic, Controller Board 06619 B 5874 New; replaces 04285

Spare Parts List

04825

F 5895 Updated

List, RSSL 07346 A 5895 New; replaces 06172

Level 1 Spares Kit 07345

A 5895 New; replaces 06716

Expendables Kit 07344

A 5895 New; replaces 06478

2010 January 20, Initial Release Rev A, per DCN 5630, with the following documents:

Document P/N Rev DCN Change Summary

Schematic, Controller w/DewPt 04285 C n/a current Rev for manual’s initial release

List, Spare Parts 04825 E n/a current Rev for this manual’s initial release

List, RSSL 06172 C n/a current Rev for this manual’s initial release

Level 1 Spares Kit 06716 A n/a current Rev for this manual’s initial release

Expendables Kit 06478 B n/a current Rev for this manual’s initial release

ii 06712B (DCN5875)

06712B (DCN5875) iii

SAFETY MESSAGES

Important safety messages are provided throughout this manual for the purpose of avoiding personal

injury or instrument damage. Please read these messages carefully. Each safety message is associated

with a safety alert symbol, and are placed throughout this manual and inside the instrument. The symbols

with messages are defined as follows:

CAUTION

This instrument should only be used for the purpose and in the manner described in

this manual. If you use this instrument in a manner other than that for which it was

intended, unpredictable behavior could ensue with possible hazardous

consequences.

NEVER use any gas analyzer to sample combustible gas(es)!

Note

For Technical Assistance regarding the use and maintenance of this instrument or any

other Teledyne API product, contact Teledyne API’s Customer Service Department:

Telephone: 800-324-5190

Email: [email protected]

or access any of the service options on our website at http://www.teledyne-api.com/

WARNING: Electrical Shock Hazard

HAZARD: Strong oxidizer

GENERAL WARNING/CAUTION: Read the accompanying message for specific

information.

CAUTION: Hot Surface Warning

Do Not Touch: Touching some parts of the instrument without protection or proper tools

could result in damage to the part(s) and/or the instrument.

Technician Symbol: All operations marked with this symbol are to be performed by

qualified maintenance personnel only.

Electrical Ground: This symbol inside the instrument marks the central safety grounding

point for the instrument.

iv 06712B (DCN5875)

CONSIGNES DE SÉCURITÉ

Des consignes de sécurité importantes sont fournies tout au long du présent manuel dans le but d’éviter

des blessures corporelles ou d’endommager les instruments. Veuillez lire attentivement ces consignes.

Chaque consigne de sécurité est représentée par un pictogramme d’alerte de sécurité; ces

pictogrammes se retrouvent dans ce manuel et à l’intérieur des instruments. Les symboles

correspondent aux consignes suivantes :

AVERTISSEMENT : Risque de choc électrique

DANGER : Oxydant puissant

AVERTISSEMENT GÉNÉRAL / MISE EN GARDE : Lire la consigne

complémentaire pour des renseignements spécifiques

MISE EN GARDE : Surface chaude

Ne pas toucher : Toucher à certaines parties de l’instrument sans

protection ou sans les outils appropriés pourrait entraîner des

dommages aux pièces ou à l’instrument.

Pictogramme « technicien » : Toutes les opérations portant ce

symbole doivent être effectuées uniquement par du personnel de

maintenance qualifié.

Mise à la terre : Ce symbole à l’intérieur de l’instrument détermine le

point central de la mise à la terre sécuritaire de l’instrument.

MISE EN GARDE

Cet instrument doit être utilisé aux fins décrites et de la manière décrite

dans ce manuel. Si vous utilisez cet instrument d’une autre manière que

celle pour laquelle il a été prévu, l’instrument pourrait se comporter de

façon imprévisible et entraîner des conséquences dangereuses.

NE JAMAIS utiliser un analyseur de gaz pour échantillonner des gaz

combustibles!

06712B (DCN5875) v

TABLE OF CONTENTS

ABOUT THIS MANUAL ........................................................................................................... I

REVISION HISTORY............................................................................................................... I

SAFETY MESSAGES.............................................................................................................III

1 INTRODUCTION .......................................................................................... 9

1.1

PREFACE ...................................................................................................................... 9

1.2

USING THIS MANUAL ................................................................................................... 10

2 SPECIFICATIONS AND WARRANTY.......................................................11

2.1 SPECIFICATIONS.......................................................................................................... 11

2.2 WARRANTY ................................................................................................................. 12

3 GETTING STARTED.................................................................................3-1

3.1 UNPACKING ...............................................................................................................3-1

3.2 INSTALLATION ............................................................................................................3-1

3.3 FRONT AND REAR PANELS ..........................................................................................3-3

3.4 ELECTRICAL AND PNEUMATIC CONNECTIONS................................................................3-4

3.5 POWER-UP ................................................................................................................ 3-5

3.6 SHUT DOWN, STORAGE AND TRANSPORTATION ............................................................ 3-5

3.6.1 Compressor Shut Down..................................................................................... 3-5

3.6.2 Storage or Transportation Shut Down ............................................................... 3-5

4 OPTIONAL HARDWARE AND SOFTWARE............................................4-1

4.1 CARRYING STRAP/HANDLE (OPT 29) .......................................................................... 4-1

4.2 RACK MOUNT KITS (OPT 20A, OPT 20B & OPT 21) ................................................... 4-2

4.3 EXPENDABLE KITS (OPT 42A) .................................................................................... 4-2

4.4 FLOW RESTRICTION (13 SLPM) (OPT 72B) ................................................................ 4-2

5 OPERATION .............................................................................................5-1

5.1 OVERVIEW .................................................................................................................5-1

5.2.1 Compressor

.......................................................................................................5-5

5.2.2 Cooling Coil

....................................................................................................... 5-5

5.2.3 Water Trap.........................................................................................................5-5

5.2.4 Water Drain Valve.............................................................................................. 5-5

5.2.5 Pressure Relief Valve ........................................................................................ 5-6

5.2.6 Regenerative Dryer............................................................................................ 5-6

5.2.7 Check Valve

......................................................................................................5-6

5.2.8 Storage Tank ..................................................................................................... 5-7

5.2.9 Pressure Sensor

................................................................................................5-7

5.2.10 Pressure Regulator.......................................................................................... 5-7

5.2.11 Pressure Gauge............................................................................................... 5-8

5.2.12 Hydrocarbon Scrubber

..................................................................................... 5-8

5.2.13 CO Scrubber

....................................................................................................5-9

5.2.14 NO Scrubber

....................................................................................................5-9

 
vi  06712B (DCN5875)   
2.15 Charcoal Scrubber........................................................................................... 5-9 
2.16 Final Filter........................................................................................................ 5-9 
2.17 Controller .........................................................................................................5-9 
2.18 Dew Point Sensor .......................................................................................... 5-12 
MAINTENANCE ........................................................................................6-1 
1 SCHEDULE.................................................................................................................6-1 
2 CLEANING..................................................................................................................6-2 
3 CHECKING THE TUBING...............................................................................................6-2 
4 REPLACING THE CHARCOAL SCRUBBER ....................................................................... 6-3 
5 REPLACING THE NO - NO
2
 SCRUBBER ........................................................................ 6-3 
6 REPLACING THE CO SCRUBBER ..................................................................................6-4 
7 REPLACING THE HYDROCARBON (HC) SCRUBBER ........................................................ 6-5 
8 SERVICING THE REGENERATIVE DRYER .......................................................................6-6 
9 CHANGING THE 4-WAY VALVE  (IN THE REGENERATIVE DRYER)..................................... 6-9 
10
 REPLACING THE SHUTTLE VALVE  (IN THE REGENERATIVE DRYER)............................... 6-9 
11
 LEAK CHECK ............................................................................................................ 6-9 
12 PARTICULATE FILTER ELEMENT REPLACEMENT......................................................... 6-10 
TROUBLESHOOTING ..............................................................................7-1 
A PRIMER ON ELECTRO-STATIC DISCHARGE ....................................8-1 
1 HOW STATIC CHARGES ARE CREATED ......................................................................... 8-1 
2 HOW ELECTRO-STATIC CHARGES CAUSE DAMAGE ....................................................... 8-2 
3 COMMON MYTHS ABOUT ESD DAMAGE ....................................................................... 8-3 
4 BASIC PRINCIPLES OF STATIC CONTROL....................................................................... 8-4 
4.1 General Rules.................................................................................................... 8-4 
5 BASIC ANTI-ESD PROCEDURES FOR ANALYZER REPAIR AND MAINTENANCE ................... 8-5 
5.1 Working at the Instrument Rack ........................................................................8-5 
5.2 Working at an Anti-ESD Work Bench ................................................................ 8-6 
5.3 Transferring Components from
 Rack to Bench and Back.................................. 8-6 
5.4 Opening Shipments from Teledyne API’s Customer Service............................. 8-7 
5.5 Packing Components for Return to Teledyne API’s Customer Service .............8-7 
APPENDIX A - SPARE PARTS............................................................................................. 1 
 
APPENDIX A – Spare Parts  A-1 
APPENDIX B – Schematics  B-1 

 
06712B (DCN5875)  vii 
LIST OF FIGURES 
FIGURE 3-1:  INSTRUMENT LAYOUT............................................................................................. 3-2 
FIGURE 3-2:  FRONT PANEL ....................................................................................................... 3-3 
FIGURE 3-3:  REAR PANEL ......................................................................................................... 3-3 
FIGURE 4-1:  CARRYING STRAP.................................................................................................. 4-1 
FIGURE 5-1:  PNEUMATIC DIAGRAM ............................................................................................ 5-3 
FIGURE 5-2:  PLAN VIEW ........................................................................................................... 5-4 
FIGURE 5-3:  CONTROL BOARD LAYOUT.................................................................................... 5-11 
FIGURE 6-1:  REGENERATIVE DRYER .......................................................................................... 6-8 
F
IGURE 8-1:  TRIBOELECTRIC CHARGING .................................................................................... 8-1 
FIGURE 8-2:  BASIC ANTI-ESD WORK STATION........................................................................... 8-4 
 
 
 
LIST OF TABLES 
TABLE 2-1: SPECIFICATIONS .................................................................................................................... 11 
TABLE 6-1:  MAINTENANCE SCHEDULE ................................................................................................... 6-1 
TABLE 7-1:  TROUBLESHOOTING ............................................................................................................. 7-1 
TABLE 8-1:  STATIC GENERATION VOLTAGES FOR TYPICAL ACTIVITIES ................................................ 8-2 
TABLE 8-2:  SENSITIVITY OF ELECTRONIC DEVICES TO DAMAGE BY ESD............................................. 8-2 
 

viii 06712B (DCN5875)

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06712B (DCN5875)

9

1 INTRODUCTION

1.1 Preface

Teledyne API is pleased that you have purchased the Model 701H Zero Air System.

The M701H is an excellent source of clean, dry air for dilution calibrators. It also may be

used as a source of purge air for permeation tube ovens or burner air for FID analyzers.

The regenerative, heatless dryer removes water and produces gas with a dew point of

less than -40°C (up to 30 SLPM flow rate) independent of the inlet dew point and assists

in the removal of other gases, greatly increasing the life of the chemical scrubbers.

The M701H includes an oil-free and diaphragm-free pump plus scrubbers to remove

SO

2

, NO, NO

2

, O

3

, H

2

S, CO, and Hydrocarbons.

Inlet air is pulled into the pump and routed through a pre-cooler and water trap to

remove moisture. The air then passes through the Regenerative Dryer for final drying

and then to the storage tank.

Tank pressure is monitored and maintained at a preset level by cycling the pump

automatically as needed, thereby extending both the pump and scrubber life. Outlet air

then passes through a filter to assure a clean, dry, analytical zero air supply.

A microcontroller cycles the regenerative dryer and water trap valves to prevent the

pump from starting against full head pressure. The M701H is an ideal accessory to the

Model 700E Mass Flow Calibrator or Model 702 Single Point Calibrator as a zero air

source for analyzers.

M701H Features:

 Standard two year warranty

 Regenerative, heatless dryer for maintenance-free water removal

independent of inlet dewpoint

 Long life scrubbers for SO

2

, NO, NO

2

, O

3

, H

2

S, CO, and Hydrocarbon.

 Automatic water drain

 Automatic pump control based on flow demand

 May be used to provide combustion air for FID

 Source of purge air for permeation tube ovens

 Zero air for Ozone Generators

Introduction Teledyne API M701H High Performance Zero Air Generator

10 06712B (DCN5875)

1.2 Using This Manual

This manual has the following data structures:

TABLE OF CONTENTS

Outlines the contents of the manual in the order the information is presented. This is a

good overview of the topics covered in the manual. There is also a list of tables, a list of

figures and a list of appendices. In the electronic version of the manual, clicking on any

of these table entries automatically views that section.

1.0 INTRODUCTION

A brief description of the M701H architecture, as well as a description of the layout of

the manual and what information is located in its various sections and chapters.

2.0 SPECIFICATIONS AND WARRANTY

This section contains a list of the monitor’s performance specifications, a description of

the conditions and configuration under which Teledyne API’s warranty statement

applies.

3.0 GETTING STARTED

A concise set of instructions for setting up, installing and starting your monitor for the

first time. This includes unpacking; mechanical installation; attaching all pneumatic lines;

attaching all electrical and electronic connections.

4.0 OPTIONAL HARDWARE & SOFTWARE

A description of optional equipment to add functionality to your instrument.

5.0 OPERATION INSTRUCTIONS

Instructions for operating the instrument and using its basic features and functions.

6.0 MAINTENANCE

Description of certain preventative maintenance procedures that should be regularly

performed on your instrument to keep it in good operating condition.

7.0 TROUBLESHOOTING

This section includes pointers and instructions for diagnosing problems with the

instrument, as well as instructions on performing repairs or replacing components on

the instrument.

06712B (DCN5875)

11

2 SPECIFICATIONS AND WARRANTY

2.1 Specifications

Table 2-1: Specifications

Parameter Specification

Output 30 SLPM at 30 psig

Max delivery pressure 35 psig

(For calibrators that have special features that include restricted

output, maximum delivery pressure is 50 psig)

Dewpoint

< 30 SLPM

< -40C

Dryer Regenerative heatless dryer with lifetime of greater than 5 years

SO

2

<0.5 ppb

NO <0.5 ppb

NO

2

<0.5 ppb

O

3

<0.5 ppb

CO< 0.025 ppm

Output Concentration

HC< 0.02 ppm

Purge air As required by the calibrator

Compressor Dual-cylinder, internal long-life, oil-less piston pump

Mounting Bench type (standard)

Rack mount (optional)

Dimensions 8.75” H x 17”W x 28”D

(22.2 cm x 43.2 cm x 71.12 cm)

Weight 55 lbs. (25 Kg)

Operating Temp

5-40C

Power 115 V, 60 Hz, 3.5 A

230 V, 50 Hz, 1.8 A

240 V, 50 Hz, 1.6 A

Environmental

Conditions

Installation Category

(Over Voltage Category ) II

Pollution Degree 2

Approvals CE

Specifications and Warranty Teledyne API M701H High Performance Zero Air Generator

12 06712B (DCN5875)

2.2 Warranty

WARRANTY POLICY (02024D) (DCN 4473)

Prior to shipment, Teledyne API equipment is thoroughly inspected and tested. Should equipment failure

occur, Teledyne API assures its customers that prompt service and support will be available.

COVERAGE

After the warranty period and throughout the equipment lifetime, Teledyne API stands ready to provide

on-site or in-plant service at reasonable rates similar to those of other manufacturers in the industry. All

maintenance and the first level of field troubleshooting are to be performed by the customer.

NON-TELEDYNE API MANUFACTURED EQUIPMENT

Equipment provided but not manufactured by Teledyne API is warranted and will be repaired to the extent

and according to the current terms and conditions of the respective equipment manufacturer’s warranty.

GENERAL

During the warranty period, T-API warrants each Product manufactured by T-API to be free from defects

in material and workmanship under normal use and service. Expendable parts are excluded.

If a Product fails to conform to its specifications within the warranty period, Teledyne API shall correct

such defect by, at Teledyne API's discretion, repairing or replacing such defective Product or refunding

the purchase price of such Product.

The warranties set forth in this section shall be of no force or effect with respect to any Product: (i) that

has been altered or subjected to misuse, negligence or accident, or (ii) that has been used in any manner

other than in accordance with the instruction provided by Teledyne API or (iii) not properly maintained.

THE WARRANTIES SET FORTH IN THIS SECTION AND THE REMEDIES THEREFORE ARE

EXCLUSIVE AND IN LIEU OF ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR

PARTICULAR PURPOSE OR OTHER WARRANTY OF QUALITY, WHETHER EXPRESSED OR

IMPLIED. THE REMEDIES SET FORTH IN THIS SECTION ARE THE EXCLUSIVE REMEDIES FOR

BREACH OF ANY WARRANTY CONTAINED HEREIN. TELEDYNE API SHALL NOT BE LIABLE FOR

ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR RELATED TO THIS

AGREEMENT OF TELEDYNE API'S PERFORMANCE HEREUNDER, WHETHER FOR BREACH OF

WARRANTY OR OTHERWISE.

TERMS AND CONDITIONS

All units or components returned to Teledyne API should be properly packed for handling and returned

freight prepaid to the nearest designated Service Center. After the repair, the equipment will be returned,

freight prepaid.

CAUTION – Avoid Warranty Invalidation

Failure to comply with proper anti-Electro-Static Discharge (ESD) handling and

packing instructions and Return Merchandise Authorization (RMA) procedures when

returning parts for repair or calibration may void your warranty. For anti-ESD handling

and packing instructions please refer to “Packing Components for Return to Teledyne

API’s Customer Service” in the Primer on Electro-Static Discharge section of this

manual, and for RMA procedures please refer to our Website at http://www.teledyne-

api.com under Customer Support > Return Authorization.

06712B (DCN5875)

3-1

3 GETTING STARTED

This section provides instructions on the proper installation and power up of the M701H.

Refer to Figure 3-1 for the instrument layout and Table 2-1 for the specifications.

3.1 Unpacking

CAUTION

TO AVOID PERSONAL INJURY, ALWAYS USE TWO PERSONS TO

LIFT AND CARRY THE M701H.

1. Verify that there is no shipping damage. If there are signs of damage, immediately

advise the shipper, then Teledyne API.

2. Remove the M701H from its shipping carton.

3. Remove the cover and check for damage inside.

4. Remove the four red shipping screws that secure the compressor base to the bottom

of the chassis. Refer to Figure 5-2 for the location of the screws.

5. Check the line voltage and frequency label on the rear panel to ensure that it

matches the local power source.

3.2 Installation

The basic M701H has rubber feet for counter-top use. Optionally, the M701H is supplied

with slides and angles for mounting in a standard 19” RETMA rack.

In order to ensure safe operation of the M701H, the following steps must be taken prior

to installation:

1. At least 6” (150 mm) clearance at the back for proper fan operation.

2. At least 3” (75 mm) at each side for proper venting.

3. Adequate support for the weight; 55 lb. (25 kg.).

4. Access at the rear for making the pneumatic and electrical connections.

5. Access at the front for occasional scrubber replacement.

6. Operate the M701H with the cover on.

Getting Started Teledyne API M701H High Performance Zero Air Generator

3-2 06712B (DCN5875)

Figure 3-1: Instrument Layout

Teledyne API M701H High Performance Zero Air Generator Getting Started

06712B (DCN5875) 3-3

3.3 Front and Rear Panels

Figure 3-2 and Figure 3-3 illustrate the Model 701H front and rear panels.

Figure 3-2: Front Panel

Figure 3-3: Rear Panel

Getting Started Teledyne API M701H High Performance Zero Air Generator

3-4 06712B (DCN5875)

3.4 Electrical And Pneumatic Connections

All connections, electric and pneumatic, are made at the rear panel (Figure 3-3).

NOTE

To maintain compliance with EMC standards, it is required that the cable length be

no greater than 3 meters for all I/O connections, which include Analog In, Analog

Out, Status Out, Control In, Ethernet/LAN, USB, RS-232, and RS-485.

Make the following pneumatic connections:

1. “AIR IN” (1/4” female pipe thread)

a. Screw the inlet filter into the “AIR IN” port. Hand-tight is OK.

NOTE

Operation without the filter will cause premature pump wear.

2. “DRAIN” (1/4” swage-type bulkhead union)

a. Connect a 1/4” diameter tubing to the water out fitting (refer to Figure 5-2) to

avoid the occasional spurts of water on the instrument rack. Connect the other

end of the tubing to a drain or, alternatively, the water can be collected in a tray or

bucket and dispersed by normal evaporation.

3. ““ZERO AIR OUT” (1/4” swage-type bulkhead union)

a. Connect the AIR OUT port of the M701H to the INLET fitting of the Model 700

Calibrator with clean 1/4” TFE tubing. The pressure in this line will normally be 30

psig, but could be as high as 80 psig –see following cautionary note.

NOTE:

A pressure reading above 35 psig, with the exception of some specials set

to 50 psig, is a FAULT condition. Call Customer Service immediately.

b. Keep this line as short as possible to minimize pressure drops.

c. POWER. Connect the power cord to the proper power source.

At 115 VAC, 60 Hz, the M701H draws 12.7 Amps upon start-up.

At 230 VAC, 50 Hz, the M701H draws 6.5 Amps upon start-up.

Refer to Table 2-1 for additional power specifications.

CAUTION

ENSURE THAT THE POWER CORD IS PROPERLY GROUNDED .

Teledyne API M701H High Performance Zero Air Generator Getting Started

06712B (DCN5875) 3-5

5. “COOLING FAN”

The rear panel cooling fan draws air IN and requires at least 6” (150 mm) of

clearance for proper operation.

3.5 Power-Up

1. Turn on the front panel POWER SWITCH (Figure 3-2).

2. The front panel POWER light should come on.

3. The cooling fan should start immediately.

4. The compressor should start after a few seconds delay. The delay is to allow the

control board to measure the local line frequency.

5. After 30 to 60 seconds, the front panel pressure gauge should read 30 psig.

6. The M701H is now producing clean dry air.

NOTE

If the M701H has been unused for several days, it may take 30-60

minutes to achieve final purity and dryness.

NOTE

The M701H zero air has A 30 liter/minute output restriction. It must be

connected to a Model 700 or similar calibrator, to restrict the zero air

flow for lesser flow rates.

3.6 Shut Down, Storage and Transportation

3.6.1 Compressor Shut Down

Remember that the M701H supplies air on demand.

If the application is not requiring zero air, the compressor will increase the pressure in

the storage tank until the “cut-out” pressure switch trips and turns off the compressor.

The pressure in the storage tank will slowly subside as air is used by the Regenerative

Dryer until the “cut-in” pressure switch turns the compressor on again.

3.6.2 Storage or Transportation Shut Down

The following procedure provides instructions on the proper shut down of the M701H if it

will not be used for an extended period of time or required to be transported:

1. Turn off the M701H.

Getting Started Teledyne API M701H High Performance Zero Air Generator

3-6 06712B (DCN5875)

2. Wait approximately 1 minute.

3. Turn on the M701H. The water drain valve will switch into the open position and vent

any accumulated water through the water drain. (Standing H

2

0 will cause corrosion)

4. Turn the M701H off.

This shut down process will vent any water that has accumulated in the coalescing filter.

It will prevent this water from passing into the M701H in the event that the instrument is

inverted during storage or shipment.

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