Type 99

this recommendation due to the pipe arrangement, it may be better to make the control line tap nearer the regulator outlet rather than downstream of a block valve. Do not make the tap near any elbow, swage, or nipple which might cause turbulence.

In many instances, it will be necessary to enlarge the downstream piping to keep flow velocities within good engineering practices. Expand the piping as close to the regulator outlet as possible.

!Warning

Adjustment of the pilot control spring to produce an outlet pressure higher than the upper limit of the outlet pressure range for that particular spring can cause personal injury or equipment damage due to bursting of pressure-containing parts or the dangerous accumulation

of gases if the maximum actuator emergency casing pressure in the Specifications section is exceeded. If the desired outlet pressure is not within the range of the pilot control spring, install a spring of the proper range according to the Maintenance section.

Each regulator is factory-set for the pressure setting specified on the order. If no setting was specified, outlet pressure was factory-set at the midrange of the pilot control spring. In all cases, check the control spring setting to make sure it is correct for the application.

Startup

Key numbers are referenced in Figure 9 for a low or high pressure pilot and in Figure 12 for an extra high pressure pilot. With proper installation completed and downstream equipment properly adjusted, perform the following procedure while using pressure gauges to monitor pressure.

 1.  Very slowly open the upstream block valve.

 2.  Slowly open the hand valve (if used) in the control line. The unit will control downstream pressure at the pilot control spring setting. See the adjustment paragraph following these numbered steps if changes in the setting are necessary during the startup procedure.

 3.  Slowly open the downstream block valve.

 4.  Slowly close the bypass valve, if any.

 5.  Check all connections for leaks.

The only adjustment on the regulator is the reduced pressure setting affected by the pilot control spring (key 43, Figure 9 or 11). Remove the closing cap assembly (key 46, Figure 9) and turn the adjusting screw (key 45, Figure 9 or 11). Turning the adjusting screw clockwise into the spring case increases the controlled or reduced pressure setting. Turning

the screw counterclockwise decreases the reduced pressure setting. Always replace the closing cap, if used, after making the adjustment.

Shutdown

Isolate the regulator from the system. Vent the downstream pressure first; then vent inlet pressure to release any remaining pressure in the regulator.

Maintenance

Regulator parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection and replacement of parts depends on the severity of service conditions or the requirements of local, state, and federal rules and regulations.

!Warning

Avoid personal injury or damage to property from sudden release of pressure or uncontrolled gas or other process fluid. Before starting to disassemble, isolate the pilot or regulator from all pressure and cautiously release trapped pressure from the pilot or regulator. Use gauges to monitor inlet, loading, and outlet pressures while releasing these pressures.

On reassembly of the regulator, it is recommended that a pipe thread sealant be applied to pressure connections and fittings as indicated in Figures 7 and 9 and lubricant be applied to sliding and bearing surfaces as indicated in Figures 7 and 9, and that an anti-seize compound be applied to adjusting screw threads and other areas indicated Figures 9 and 11.

Actuator and Standard P590 Series Filter

This procedure is to be performed if changing the main spring and spring seat for those of a different range, or if inspecting, cleaning, or replacing any other parts. Unless otherwise indicated, part key numbers for a Type 99 regulator with low or high pressure pilot and

8