Emerson FISHER Enardo Rim Vent Instruction Manual

Instruction Manual
D103826X012
December 2021
Enardo Rim Vent Pressure Relief Valve
Table of Contents

Introduction ............................................................................1

Specifications ........................................................................2

Principle of Operation ............................................................1

Product Identification And Marking ........................................3
Installation .............................................................................3
Ppe Warning .........................................................................3
Maintenance ..........................................................................4
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WARNING
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion, fire and/or
chemical contamination causing property
damage and personal injury or death.
Fisher™ rim vents must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations, and Emerson Process
Management Regulator Technologies Tulsa,
LLC instructions.
Failure to correct trouble could result in a
hazardous condition. Call a qualified service
person to service the unit. Installation,
operation and maintenance procedures
performed by unqualified person may
result in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury. Only
a qualified person must install or service the
pressure relief valve.
Introduction
Scope of the Manual
This Instruction Manual provides instructions for installation
and maintenance for the enardo rim vent pressure relief valve.
Enardo Rim Vent
Figure 1. Enardo Rim Vent Pressure Relief Valve
Product Description
Rim vents (top mount) prevent the loss of vapors in a closed
storage system and relieve pressure in atmospheric and
low pressure storage tanks and floating roof tanks such as
those defined in API 12F, API 12B, API 650 and EN 14015.
Rim vents can also be used for emergency venting on small
atmospheric and low pressure tanks.
The enardo rim vent is a pressure-only relief vent that can be
installed on a mating CL150 flat faced flange. A 6 in. CL150
flange has a bolting circle with 8 - 0.88 in. bolt holes on a
9 - 1/2 in. bolt hole diameter.
Principle of Operation
Rim vents are installed on floating roofs or cone roofs of
storage tanks with direct communication to the vapor space. In
floating roof tanks, rim vents provide pressure relief to the roof
and seals when the tank is empty, the roof is landed and the
tank is being filled.
Pressure relief to the seals can be achieved when the roof is
floating and if product evaporation occurs. As the pressure in
the vapor space increases above the set point, the weight-
loaded pallet lifts vertically to relieve pressure. As the pressure
in the vapor space drops back below the rim vent set point, the
pallet lowers and closes. The rim vent set point is adjustable by
adding to or removing weights from the pallet.