EMERSON Manuals Rim Vent Pressure Relief Valve Instruction Manual, Enardo-EN

Instruction Manual

Rim Vent

D103825X012 December 2021

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

WARNING

Figure 1. Rim Vent Pressure Relief Valve

Failure to follow these instructions or to properly install and maintain this equipment

Product Description

could result in an explosion, fire and/or chemical contamination causing property Rim vents (top mount) prevent the loss of vapors in a closed damage and personal injury or death. storage system and relieve pressure in atmospheric and

low pressure storage tanks and floating roof tanks such as

Enardo rim vents must be installed,

those defined in API 12F, API 12B, API 650 and EN 14015.

operated and maintained in accordance

Rim vents can also be used for emergency venting on small

with federal, state and local codes, rules

atmospheric and low pressure tanks.

and regulations, and Emerson Process Management Regulator Technologies Tulsa, The rim vent is a pressure-only relief vent that can be LLC instructions. 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

Failure to correct trouble could result in a

9 - 1/2 in. bolt hole diameter.

hazardous condition. Call a qualified service person to service the unit. Installation, operation and maintenance procedures

performed by unqualified person may Principle of Operation

result in improper adjustment and unsafe

Rim vents are installed on floating roofs or cone roofs of

operation. Either condition may result in

storage tanks with direct communication to the vapor space. In

equipment damage or personal injury. Only

floating roof tanks, rim vents provide pressure relief to the roof

a qualified person must install or service the

and seals when the tank is empty, the roof is landed and the

pressure relief valve.

tank is being filled. or th er ic nl Pressure relief to the seals can be achieved when the roof is

Introduction

floating and if product evaporation occurs. As the pressure in the vapor space increases above the set point, the weight-

Scope of the Manual

loaded pallet lifts vertically to relieve pressure. As the pressure in the vapor space drops back below the rim vent set point, the

This Instruction Manual provides instructions for installation

pallet lowers and closes. The rim vent set point is adjustable by

and maintenance for the rim vent pressure relief valve.

adding to or removing weights from the pallet.