Groth 2000A - Manual (Page 4)

4
GENERAL SAFETY INSTRUCTIONS
This section is an overview of safety guidelines that should be followed during the installation, operation and
maintenance of Groth Pressure / Vacuum Relief Valves. To understand the context of these instructions and
warnings, it is necessary to completely read and understand the contents of this manual.
The purpose of a pressure/vacuum relief valve is to prevent excessive pressure or vacuum in a tank or process
system. The valve must be designed for the proper MAWP and flow requirements of the system. Consult API
Standard 2000 for tank protection sizing procedures. An improperly specified or functioning relief valve may result in
structural damage to the tank or system, and can cause severe personal injury or death.
SAFETY WARNINGS
THE PURPOSE OF AN EMERGENCY RELIEF VALVE (ERV) IS TO PREVENT EXCESSIVE PRESSURE IN A
TANK OR PROCESS SYSTEM UNDER EMERGENCY SITUATIONS. THE VALVE MUST BE DESIGNED FOR
THE PROPER MAWP AND FLOW REQUIREMENTS OF THE SYSTEM. CONSULT API STANDARD 2000 FOR
TANK PROTECTION SIZING PROCEDURES. AN IMPROPERLY SPECIFIED OR FUNCTIONING EMERGENCY
RELIEF VALVE MAY RESULT IN STRUCTURAL DAMAGE TO THE TANK OR SYSTEM AND SEVERE
PERSONAL INJURY OR DEATH.
THE ERV SET PRESSURE AND SET VACUUM ARE SET AT THE FACTORY PER PURCHASE ORDER
SPECIFICATIONS. THE SET PRESSURE AND NOMINAL FLOW CAPACITY ARE STAMPED ON THE VALVE
NAMEPLATE. DO NOT ATTEMPT TO READJUST THE SET PRESSURE. DO NOT CHANGE PRESSURE
RATING BY ADDING ADDITIONAL WEIGHTS TO THE PALLET ASSEMBLY WITHOUT CONSULTING
FACTORY. ADDING MORE WEIGHTS THAN RECOMMENDED WILL RESULT IN AN INCREASE IN SETTING.
DO NOT ATTEMPT TO LIFT PALLET ASSEMBLIES BY HAND. THESE ASSEMBLIES CAN WEIGHT IN EXCESS
OF 400 LBS. AND COULD CAUSE BODILY INJURY WITHOUT THE USE OF AN EXTERNAL LIFTING METHOD.
MODEL 2000A AND 2050A VALVES WILL LIKELY NOT RESEAT AFTER A SIGNIFICANT OVER-PRESSURE
CONDITION. IF THIS IS NOT ACCEPTABLE, IT IS RECOMMENDED TO USE EITHER MODEL 2400A OR 2450A.
EMERGENCY RELIEF VALVES ARE DESIGNED TO PROVIDE FULL RATED CAPACITY AT 100% OVER-
PRESSURE. IF THE VALVE IS TO BE OPERATED AT A REDUCED OVER-PRESSURE, CONSULT FACTORY
FOR ACTUAL FLOW CAPACITY UNDER SPECIFIED CONDITIONS.
DO NOT MIX PALLET ASSEMBLIES FROM DIFFERENT VALVES. FAILURES TO ENSURE THAT THE PALLET
ASSEMBLIES ARE INSTALLED IN THE ORIGINAL AND CORRECT LOCATION CAN CHANGE THE PRESSURE
OR VACUUM RELIEF SETTINGS. THIS CAN CAUSE A TANK FAILURE.
DO NOT LOOSEN HEX NUTS UNTIL ALL SPRING COMPRESSION HAS BEEN RELEASED. SPRING PRE-
LOAD IS SUBSTANTIAL AND COULD CAUSE SEVERE PERSONAL INJURY IF FASTENERS WERE REMOVED
WITH THE SPRING COMPRESSED.
DO NOT ATTEMPT TO REMOVE THE VALVE FROM THE TANK OR PROCESS VESSEL WITHOUT FIRST
BLEEDING ALL PRESSURE FROM THE SYSTEM. ALTERNATIVE MEANS OF PRESSURE RELIEF MUST BE
PROVIDED WHEN THE VALVE IS OUT OF SERVICE.
THE VALVE HAS BEEN EXPOSED TO PROCESS VAPORS WHILE IN SERVICE. OBSERVE ALL PLANT
PROCEDURES AND MATERIAL SAFETY DATA SHEETS (MSDS) FOR THE PRODUCTS IN THE SYSTEM
WHEN INSPECTING, ADJUSTING OR SERVICING THE VALVE. TAKE APPROPRIATE SAFETY
PRECAUTIONS REGARDING EYE PROTECTION, RESPIRATION AND SKIN CONTACT.
DO NOT ADD ANY WEIGHT TO THE PALLET ASSEMBLY, CHANGE THE ADJUSTMENT SCREW (CHANGING
SET PRESSURE OR VACUUM), OR CHANGE PALLET STEM WITHOUT FIRST CONSIDERING THE
ALLOWABLE TANK PRESSURE OR WITHOUT MEASURING DESIGN LIFT TO ENSURE THE LIFT IS NOT
RESTRICTED. RESTRICTING VALVE LIFT COULD “CHOKE” THE VALVE AND NOT ALLOW FOR FULL
RATED CAPACITY. CHANGING THE WEIGHT OR ADJUSTMENT OF A SPRING COULD ALSO RESTRICT THE
LIFT OF A VALVE AT A SPECIFIED OVERPRESSURE, REDUCING THE RATED CAPACITY OF THE VALVE.
UNDER THESE CONDITIONS, THE VALVE WILL NOT PROTECT THE TANK FROM RUPTURING DUE TO
CHANGES IN INTERNAL PRESSURE. TANK FAILURE CAN CAUSE MATERIAL DAMAGE AND LOSS AND
RESULT IN SEVERE PERSONAL INJURY OR DEATH.
THE ERV IS EQUIPPED WITH A GROUND STRAP TO PREVENT STATIC ELECTRIC DISCHARGE. THIS
STRAP MUST BE SECURED TO A PROPER GROUND WHILE ALLOWING VALVE OPERATION. IF THIS
STRAP IS IMPROPERLY GROUNDED, STATIC DISCHARGE COULD CAUSE TANK RUPTURE AND RESULT IN
SEVERE INJURY OR DEATH.