Installation Guide

Types 66, 66Z, and 66ZZ
D100247XENG
Installation Guide
English – May 2002
www.FISHERregulators.com
1. The pressure/temperature limits in this installation guide and any applicable
standard or code limitation should not be exceeded.
Introduction
This installation guide provides instructions for installation,
startup, and adjustment. To receive a copy of the instruction
manual, contact your local Fisher Sales
Office or Sales Representative or view a copy at
www.FISHERregulators.com. For further information refer to:
Type 66, 66Z, and 66ZZ Instruction Manual (form 1056,
D100247X012).
The Type 66 self-operated regulator maintains a reduced
outlet pressure while satisfying the downstream flow
demands. The Type 66Z and 66ZZ self-operated regulators
also control a reduced outlet pressure; however, both have
springs sensitive to negative pressures and can be used
for vacuum regulation.
P.E.D Category
This product may be used as a safety accessory with
pressure equipment in the following Pressure Equipment
Directive 97/23/EC categories. It may also be used outside
of the Pressure Equipment Directive using sound
engineering practice (SEP) per table below.
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Specifications
Body Sizes and Styles
See table 1
Maximum Allowable Pressures
(1)
Maximum Safe Inlet Pressure to Avoid Internal Part
Damage : 0,69 bar (10 psig) for Type 66, 0,34
bar (5 psig) for Type 66Z, and 0,14 bar (2 psig) for
Type 66ZZ
Maximum Operating Inlet Pressure
(1)
Recommended
for Good Performance : 0,34 bar (5 psig) for Types 66
and 66Z, and 0,14 bar (2 psig) for Type 66ZZ
Emergency Inlet : 1,7 bar (25 psig)
Emergency Outlet : 0,6 bar (8 psig)
Proof Test Pressure
All Pressure Retaining Components have been proof
tested per Directive 97/23/EC - Annex 1, Section 7.4
Outlet Pressure Ranges
(1)
See table 2
Temperature Capabilities
(1)
-29 to 82°C (-20 to 180°F)
Installation
Only qualified personnel should install or service
a regulator. Regulators should be installed,
operated, and maintained in accordance with
international and applicable codes and
regulations, and Fisher instructions.
If the regulator vents fluid or a leak develops in
the system, it indicates that service is required.
Failure to take the regulator out of service
immediately may create a hazardous condition.
Personal injury, equipment damage, or leakage due
to escaping fluid or bursting of pressure-containing
parts may result if this regulator is overpressured
or is installed where service conditions could
exceed the limits given in the Specifications section,
or where conditions exceed any ratings of the
adjacent piping or piping connections.
To avoid such injury or damage, provide pressure-
relieving or pressure-limiting devices (as required
by the appropriate code, regulation, or standard) to
prevent service conditions from exceeding limits.
Additionally, physical damage to the regulator could
result in personal injury and property damage due
to escaping fluid. To avoid such injury and damage,
install the regulator in a safe location.
Clean out all pipelines before installation of the regulator
and check to be sure the regulator has not been damaged
or has collected foreign material during shipping. For NPT
bodies, apply pipe compound to the male pipe threads. For
flanged bodies, use suitable line gaskets and approved
piping and bolting practices. Install the regulator in any
position desired, unless otherwise specified, but be sure
flow through the body is in the direction indicated by the
arrow on the body.
Install Type 66, 66Z, and 66ZZ regulators horizontally with
the spring case vertically above the valve body.
Note
It is important that the regulator be installed so that
the vent hole in the spring case is unobstructed at all
times. For outdoor installations, the regulator should
be located away from vehicular traffic and positioned
so that water, ice, and other foreign materials cannot
enter the spring case through the vent. Avoid placing
the regulator beneath eaves or downspouts, and be
sure it is above the probable snow level.
With steel bodies, an external control line is required.
Connect DN 20 (3/4-inch) NPT control line to the lower
diaphragm casing connection from the point where the
downstream pressure is to be sensed.
Overpressure Protection
The recommended pressure limitations are stamped on
the regulator nameplate. Some type of overpressure
protection is needed if the actual inlet pressure exceeds the
maximum operating outlet pressure rating. Overpressure
protection should also be provided if the regulator inlet
pressure is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure limitations
does not preclude the possibility of damage from external