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Model ES-660-HF
Specifications
The Specifications table lists the specifications for the Model ES-660-HF spring-loaded hatch.
Bolt Pattern
8 in. API
Pressure Setting Range
4, 6, 8, 12 and 16 oz./sq. in.
Vacuum Setting Range
0.4, 0.9 and 3.5 oz./sq. in.
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
PRESSURE SETTING, OZ./SQ. IN.
Product Description
The Model ES-660-HF high flow gauge hatch is designed
to provide much higher flow rates than standard gauge
hatches, while maintaining the industry leading, tight
sealing performance of the ES-660 Series. It also
provides trouble free operation with maintenance. The
primary function of the Model ES-660-HF high flow hatch
is to prevent the loss of vapors in a closed storage system
and provide pressure and vacuum relief.
Model ES-660-HF is a spring-loaded with round base
and cover and can replace any standard API 8 in. thief
hatch. It is intended for steel and fiberglass tanks which
require a tighter seal for reduced vapor loss and a higher
volume of venting than offered by standard thief hatches.
Principle of Operation
Enardo gauge hatches are designed to control
evaporation losses and protect tanks against excessive
pressure or vacuum. When the tank pressure is above
the setpoint of the hatch, the cover opens to relieve
excess pressure. When the overpressure has dissipated,
the cover reseats onto the base to provide tight seal.
Teflon
and Viton
are marks owned by E. I. du Pont de Nemours and Company.
®
®
2
(1)
(1)
Table 1. Pressure Tagging Information
4
6
8
12
16
Construction Material
Casting: Aluminum (non-sparking)
Pressure Gasket: HNBR (standard) and Viton
Vacuum Gasket: Fluorosilicone (standard), Viton
and Teflon
®
Optional Equipment
Base Gasket, Bolt Set, Non-Corrosive Coating
Approximate Shipping Weight
29 lbs / 13.2 kg
FLOW RATE SCFH (AIR) AT 24 OZ./SQ. IN. TANK PRESSURE
225,000
210,000
200,000
150,000
100,000
Tagging Information
The Model ES-660-HF high flow hatch has tagging
information on the spring capsule assembly and on
the lid.
Figure 2 shows the typical locations of the tagging
information found on the Model ES-660-HF high
flow hatch.
Location 1, on the spring capsule assembly, details the
pressure spring setting and the flow rate for that spring
setting when the tank pressure is at 24 oz./sq. in. Table 1
shows the flow rates at 24 oz./sq. in. for each pressure
spring setting.
Location 2, on the lid, details the vacuum setting and the
date of manufacture.
Installation and Disassembly
!
Ensure the tank is at atmospheric
pressure before opening. A pressure
build-up inside the tank can cause a
spray to be emitted from the hatch if
opened under pressure.
WARNING
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