Groth 2000A User Manual
Page 2
2
TABLE OF CONTENTS:
INTRODUCTION:
2
DESIGN, FUNCTION & OPERATION
3
GENERAL SAFETY INSTRUCTIONS
4
SAFETY WARNINGS
4
INSPECTION AND INSTALLATION
5
PREVENTIVE MAINTENANCE
6
MODEL 2000A DISASSEMBLY & ASSEMBLY
7
MODEL 2000A DISASSEMBLY & ASSEMBLY
7
MODEL 2050A DISASSEMBLY & ASSEMBLY
8
MODEL 2400A DISASSEMBLY & ASSEMBLY 12
MODEL 2450A DISASSEMBLY & ASSEMBLY 13
TESTING AND SETTING PROCEDURE
17
MODEL INFORMATION
13
PRODUCT LIMITED WARRANTY
13
INTRODUCTION:
Groth’s Emergency Relief Valve (ERV) is designed to provide emergency relief capacity beyond that furnished by
the normal operating pressure relief valve on the tank. They are used on liquid storage tanks and other process
vessels or systems to prevent structural damage due to excess internal pressure or vacuum that could result under
emergency situations due to fire exposure or failure of the inert gas blanketing system.
Storage tanks are pressurized when liquid is pumped in, compressing the existing vapor or when increasing
temperature causes increased evaporation or expansion of existing vapor. Conversely, vacuum may be created
when pumping out or due to decreasing temperature. To prevent damage, vapor must be allowed to escape or enter
the tank at a specified pressure or vacuum condition. The volume rate of venting depends upon the tank size,
volatility of the contents, the pumping rate and the temperature. See API Standard 2000 for the procedures to
determine venting requirements.
The valves are designed to be self closing under normal operation. As excessive pressure builds up, the valve
relieves and then reseats when over pressure has been dissipated. Some models have a restraining cable to
connect the head and flanges and also serve as a grounding cable.
The pallets include Groth's special "cushioned air" seating. FEP seating diaphragms are standard; they minimize
sticking caused by resinous vapors and atmospheric moisture. Diaphragms are also available in Buna-N, FKM and
other elastomers. Peripheral guides insure proper alignment and integrity of the seating.
The ERVs are preset at the factory in accordance with the purchase order's instructions. These settings are printed
on the stainless steel name tag.
The valve must be maintained by a knowledgeable valve technician. It should only be assembled under clean
conditions preferably in a shop environment. Carefully read and understand this Manual before installing or repairing
this valve.
For information not contained in this manual, please contact:
Groth Corporation
13650 N. Promenade Blvd
Stafford, TX 77477
281-295-6800 (Phone)
281-295-6995 (Fax)