Emerson 289 Instruction Manual

Instruction Manual Form 1724
October 2014
289 Series Relief Valves
!
Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion
and/or  re causing property damage and
personal injury or death.
Fisher® relief valves must be installed, operated and maintained in accordance with federal, state and local codes, rules and regulations and manufacturer’s instructions.
If a leak develops or if the outlet continually vents gas, service to the unit may be required. Failure to correct trouble could result in a hazardous
condition. Only a quali ed person must
install or service the unit.
Call a gas service person to service the
unit. Only a quali ed person must install
or service the regulator.
289 Series
18702
2 NPT TYPE 289H
Introduction
Scope of the Manual
This manual provides instructions for installation, maintenance and parts ordering information for the 289 Series relief valves. Instructions for other equipment used with these relief valves can be found in separate instruction manuals.
Description
The 289 Series pressure relief valves (see Figure 1) are throttling relief valves used downstream of pressure regulators to protect the downstream system from overpressure. These relief valves can be used for natural gas, air, propane or other noncorrosive, gas-
 ow service.
W18701
1 NPT TYPE 289H
Figure 1. Type 289H Relief Valves
D100280X012
www.fisherregulators.com
289 Series
Specications
Available Congurations
See Table 1
Body Sizes and Inlet Connections
Type 289L: 3/4 or 1 NPT
Types 289A and 289U: 1/4 NPT
Type 289H: 1 or 2 NPT
Type 289HH: 1 NPT
Maximum Allowable Relief (Inlet) Pressure Maximum Relief Set Pressure
See Table 1
Material Temperature Capabilities
Nitrile (NBR) and Neoprene (CR):
-20 to 150°F / -29 to 66°C
Fluorocarbon (FKM)
20 to 300°F / -7 to 149°C Available with Types 289H and 289HH only
1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.
2. Bubble-tight shutoff cannot be attained at settings below 5 psig / 0.34 bar with Fluorocarbon (FKM) O-ring seat.
(2)
:
(1)
(1)
and
Pressure Setting Adjustment
Adjusting screw
Pressure Registration
Internal
Approximate Shipping Weights
Types 289A and 289U: 0.75 lbs / 0.3 kg
Type 289H:
1 NPT Size: 4 lbs / 2.0 kg
2 NPT Size: 15 lbs / 7.0 kg
Type 289HH: 4 lbs / 2.0 kg
Type 289L: 15 lbs / 7.0 kg
Additional Specications
For construction materials, see Parts List
Principle of Operation
Refer to Figures 2 and 4. The 289 Series Relief valves are to be installed (between large service regulators such as S202G or S302G Series) so the outlet is piped downstream to relieve excess pressure to the atmosphere. As inlet pressure increases, the spring is compressed by the diaphragm, moving the disk away from the seat. When the valve is opening, high
gas velocity through the orice creates an area of
relatively low pressure near the end of the pitot tube. This pitot tube effect forms a partial vacuum above the diaphragm (spring case area) which helps to open the valve further.
Installation
!
Installing a 289 Series relief valve where its capabilities can be exceeded or where proper operation might be impaired may cause personal injury, property damage or leakage due to bursting of pressure-containing parts or explosion
of accumulated gas. To avoid such conditions, install a 289 Series relief valve where:
• Service conditions are within the unit capabilities specied in the Specications section and
• The relief valve is protected from
exposure to physical damage and/or corrosive substances.
1. When installing a 289 Series relief valve, make sure that the installation of the system complies with applicable local, state or federal codes or regulations.
2. Use qualied personnel when installing, operating and maintaining a 289 Series relief valve. Before installation, make sure there is no damage to or foreign material in the relief valve and that all piping is clean and unobstructed.
3. For installation of Types 289H, 289HH and 289L relief valves, the vent in the spring case must remain plugged or undrilled in order for the pitot tube to function properly.
4. The 289 Series relief valves may be installed in any orientation. However, when installing the relief valve at an outside location, adequate protection, such as
2
rain caps or elbow piping (see Figure 4), must be attached to the outlet to keep the relief valve from getting plugged or from collecting moisture, corrosive chemicals or other foreign materials. If piping is to be attached to the valve outlet, the following parts (if they are connected to the valve outlet as shown in
Figures 6 through 10) must rst be removed: the
screen (key 9), the snap ring (key 13) and the gasket (key 15). A typical installation of a 289 Series Relief Valve is shown in Figure 4.
!
If using a 289 Series relief valve on
hazardous or ammable gas service,
personal injury and property damage
could occur due to re or explosion of
vented gas that may have accumulated.
To prevent such injury or damage, provide piping or tubing to vent the gas to a safe, well-ventilated area. Also, when venting a hazardous gas, the piping or tubing should be located far enough away from any buildings or windows so to not create a further hazard and the vent opening should be protected against anything that could clog it.
289 Series
M1048
INLET PRESSURE OUTLET PRESSURE
Figure 2. 2 NPT Type 289H Operational Schematic
5. Apply pipe compound to the male pipeline threads only; do not apply pipe compound to the internal body threads. Then install the relief valve so that the ow through it will match the direction arrow or marking cast on the valve body.
When installing the molded diaphragm in the 289 Series Relief Valves, make sure the diaphragm convolutions is installed in the down position as shown in Figure 3.
Startup
Key numbers are shown in Figures 6 through 10. With proper installation completed and system equipment properly adjusted, close any vent valves and slowly open the upstream shutoff valve while using pressure gauges to monitor pressure.
Note
To ensure proper operation of the pitot tube, if present, the spring case (key 2) must be tightly sealed. It is recommended that the gasket (key 15) be replaced whenever the closing cap (key 14) is
Figure 3. Installation of Diaphragm
INSTALL DIAPHRAGM CONVOLUTION DOWN
3
289 Series
SERVICE REGULATOR
PROTECT VENT PIPE WITH RAIN CAP
289 SERIES RELIEF VALVE
AJ4698-C A2404-1
Figure 4. Typical Installation
removed. Antiseizing sealant should be applied to the adjusting screw (key 6) threads on valves without closing caps.
If set pressure adjustment is necessary, monitor the inlet pressure with a gauge during the adjustment procedure. Remove the closing cap (key 14) or loosen the hex nut (key 11) and turn the adjusting screw (key 6) clockwise to increase or counterclockwise to decrease the relief pressure setting.
For 2 NPT Type 289H relief valves, when changing from one spring range to another, it is recommended that a new spring case be used so that the travel stop drive screw will be positioned correctly for the corresponding spring range. Each spring range requires that the travel stop drive screw be positioned appropriately in the spring case to prevent setting the relief valve pressure too high. The location of the travel stop drive screw for each spring and spring range is shown in Figure 5.
Maintenance
Relief valve parts are subject to normal wear and should be inspected periodically for maintenance. The frequency of inspection and replacement of parts depends upon the severity of service conditions.
This section contains information for inspection and maintenance of 289 Series relief valves. Maintenance procedures are presented for relief valve
congurations of similar construction. Refer to the appropriate procedure and gure for the particular relief valve conguration when changing the control
spring to one of a different range or when inspecting, cleaning or replacing any other relief valve parts. The screen (key 9, Figures 6 through 9) and vent piping, if present, should be free of foreign material that might
impair relief ow.
Note
Shutdown
Close the upstream shutoff valve, and release all pressure from the relief valve.
4
The relief valve body (key 1, Figures 6 through 10) may remain in the pipeline during maintenance unless replacement of the valve body is necessary.
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