Groth 1800A Manuel d'utilisateur télécharger pdf (Page 2)

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TABLE OF CONTENTS

I. INTRODUCTION 3

II. DESIGN AND FUNCTION 4

1. FIGURE 1 – TYPICAL TANK INSTALLATION 4

2. FIGURE 2 – PRESSURE RELIEF 4

3. FIGURE 3 – VACUUM RELIEF 4

III. SAFETY WARNINGS 5

IV. INSPECTION AND STORAGE 5

V. INSTALLATION 6

1. TABLE 1 – BOLT TORQUE AND STUD SPECIFICATIONS 6

2. TABLE 2 – VALVE WEIGHTS AT MAXIMUM SETTINGS 6

VI. MAINTENANCE 7

1. FIGURE 4 – VALVE CROSS SECTION 7

2. FIGURE 5 – PALLET DETAIL 7

3. TABLE 3 – STEM LENGTH 8

4. FIGURE 6 – SEAT INSERT DETAIL 8

VII. VALVE TESTING PROCEDURE 9

1. TABLE 4 – SEAT LEAKAGE TEST CRITERIA 9

VIII. MODEL IDENTIFICATION 10

IX. PRODUCT LIMITED WARRANTY 11

X. APPENDIX A – MODEL 1800A PRESSURE/VACUUM RELIEF VALVE 12

XI. APPENDIX B – MODEL 1810A VACUUM RELIEF VALVE 13

XII. APPENDIX C – MODEL 1820A PRESSURE/VACUUM RELIEF VALVE 14

XIII. APPENDIX D – MODEL 1830A PRESSURE RELIEF VALVE 15

XIV. APPENDIX E – MODEL 1860A PRESSURE RELIEF VALVE 16

XV. APPENDIX F – MODEL 1870A VACUUM RELIEF VALVE 17

I. INTRODUCTION

Pressure and/or vacuum relief valves are used on liquid storage tanks and other process vessels

or systems to prevent structural damage due to excess internal pressure or vacuum.

Storage tanks are pressurized when liquid is pumped in, compressing the existing vapor or when

rising temperatures cause increased evaporation or expansion of existing vapor. Conversely, a

vacuum condition may be created when pumping out or due to falling temperature. To prevent

tank damage, vapor must be allowed into or out of the tank at specified pressure/vacuum

conditions. The volume rate of venting depends upon the tank size, volatility of the tank contents,

the pumping rates and the temperature. Refer to API Standard 2000, ISO 28300, or local

regulations for the procedures to determine venting requirements.

A relief valve must be carefully maintained by a qualified valve technician. It should only be

assembled under clean conditions, preferably in a service shop environment. Carefully read and

understand this manual before installing or attempting to repair a valve.

For information not contained in this manual, please contact:

Groth Corporation

13650 N. Promenade Blvd.

Stafford, TX, 77477 USA

Phone: 281-295-6800

Fax: 281-295-6999

www.grothcorp.com

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Groth 1800A Manuel d'utilisateur Page 2

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