EMERSON Enardo ES-665 Series Spring-Loaded Thief Hatch Instruction Manual, Fisher-EN
Summary
The Enardo ES-665 Series is a high-precision spring-loaded thief hatch engineered for industrial storage tanks. It maintains ultra-tight pressure or vacuum seals, effectively regulating tank contents to minimize evaporation losses and guard against overpressure build-up. This manual provides qualified professionals with comprehensive instructions covering installation, operation, routine maintenance schedules, specifications, and parts ordering necessary for safe performance in demanding environments.
Page 1 Text Content
Instruction Manual
Enardo ES-665 Series
D104127X012 July 2021
Enardo ES-665 Series Spring-Loaded Thief Hatch Table of Contents Introduction ..................................................................1 Specifications ..............................................................2 Principle of Operation ..................................................2 Tagging Information......................................................2 Installation ...................................................................2 Maintenance ................................................................4 Parts Ordering .............................................................5 Parts List......................................................................5
MODEL ENARDO ES-665
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™ spring-loaded hatch must be installed, operated and maintained in accordance with federal,
MODEL ENARDO ES-665-L
state and local codes, rules and regulations and Emerson Process Management Regulator Technologies Figure 1. Enardo ES-665 and Enardo ES-665-L Series
Tulsa, LLC instructions. Spring-loaded Thief Hatch
Failure to correct trouble could result in a hazardous condition. Call a qualified
service person to service the unit. Introduction
Installation, operation and maintenance procedures performed by unqualified
ut Scope of the Manual si de or th er ic nl
person may result in improper adjustment and unsafe operation. Either This Instruction Manual provides instructions for condition may result in equipment installation, startup, maintenance and parts ordering damage or personal injury. Only a information for the Enardo ES-665 Series qualified person shall install or service spring-loaded hatch. the spring-loaded hatch.
Page Summary Contents For EMERSON Enardo ES-665 Series Spring-Loaded Thief Hatch Instruction Manual, Fisher-EN
Manual Details
| Brand | Emerson |
|---|---|
| Pages | 8 |
| File Size | 1.56 MB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What types of gaskets are available?
Gaskets include HNBR (standard), Performance® Fluorosilicone, Viton, Ethylene Propylene (EPDM) for pressure, and Fluorosilicone (standard), Viton, and EPDM for vacuum.
Who should install or service the Enardo ES-665?
Only a qualified person shall install or service the spring-loaded hatch to prevent unsafe operation and personal injury.
What is the temperature range of the ES-665 Series?
The standard temperature range is -4 to 140°F / -20 to 60°C, but Fluorosilicone gaskets should be used for lower temperatures down to -40°F / -40°C.
How does the ES-665 Series control pressure excess?
The hatch is designed using a center assembly that opens when internal pressure exceeds the setpoint, relieving excess pressure and reseating when pressure dissipates.