EMERSON Spence VCIMD-14952 Type P125 Trip Stop Pilot Instruction Manual

Spence VCIMD-14952 Type P125 Trip Stop Pilot
Instruction Manual

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.
Emerson pilot must be installed, operated, and maintained in accordance with federal, state, and local codes, rules, and regulations and Emerson Process Management Regulator Technologies, Inc. (Emerson) instructions.
If the pilot vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition.
Installation, operation, and maintenance procedures performed by unqualified personnel may result in improper adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Only a qualified person shall install or service the Type P125.

Introduction

Scope of the Manual
This manual provides instructions for installation, operation, maintenance, and parts information for the Type P125 trip-stop pilot.

Figure 1. Type P125 Trip Stop Pilot

Product Description
The Type P125 trip-stop pilot is used in conjunction with a Spence main valve. This combination is known as a trip-stop valve.
Type P125 is a manually resettable trip pilot that, once “tripped”, results in the closing of a Spence main valve; therefore preventing further overpressure of the downstream system. The trip pilot is set at a pressure slightly greater than the desired delivery pressure. This setting procedure is completed at the factory before the pilot is shipped.

Specifications

The Specifications section gives some general specifications for the Type P125 trip-stop pilot. The nameplates give detailed information for a specific pilot as built in the factory.

Maximum Inlet Temperature(1)
Cast Iron: 450°F / 232°C
Cast Steel: 750°F / 400°C
Maximum Inlet Pressure(1)
Cast Iron: 250 psig / 17.2 bar
Cast Steel: 600 psig / 41.4 bar
Pressure Ranges(1)
5 to 25 psig / 0.35 to 1.72 bar
10 to 50 psig / 0.69 to 3.45 bar
40 to 150 psig / 2.76 to 10.3 bar
150 to 175 psig / 10.3 to 12.1 bar| Construction Materials
Body: Cast Iron, Steel
Stem, Disc, and Seat: Stainless steel
Gasket: Stainless steel
Approximate Weights
Cast Iron: 26 lbs / 12 kg
Cast Steel: 28 lbs / 13 kg
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1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.

Principle of Operation

During normal operation, the Type P125 trip stop pilot is mechanically held open (latched). Steam supply pressure is piped to the diaphragm of the trip stop main valve (Spence Types E, E2, or E5 ), holding it in the open position. Reduced pressure is then controlled by the pressure-reducing valve. If the reduced pressure increases to the set pressure of the Type P125 trip-stop pilot, two things happen. The weighted lever is unlatched, shutting off the steam supply to the trip-stop main valve diaphragm chamber and the actuating steam in the diaphragm chamber of the trip-stop main valve is vented downstream. Venting of the actuating steam allows the spring in the trip stop the main valve to shut the valve. The Type P125 Pilot must be manually reset after being tripped. The reduced steam pressure must be less than the Type P125 set pressure for the Type P125 to remain reset.

Installation

(Figures 2 and 3)

WARNING
Personal injury or system damage may result if this pilot is installed, without appropriate overpressure protection, where service conditions could exceed the limits given in the Specifications section and/or pilot nameplate.
Additionally, physical damage to the pilot may result in personal injury or property damage due to escaping of accumulated gas. To avoid such injury and damage, install the pilot in a safe location.
All pressure equipment should be installed in a non-seismic area; should not be exposed to fire, and should be protected from thunderbolt (lightning) strikes.
CAUTION
The piping system must be adequately designed and supported to prevent extraordinary loads on the pressure equipment.
Planning

1. Locate the trip stop valve in a straight run of the horizontal pipe, downstream of the reducing valve. Allow headroom above the trip stops the main valve for access through the blind flange.
2. Provide clearance for stem withdrawal below. Allow headroom above the trip stop pilot for installation of 1/4 in. / 6.35 mm control pipe.

Gauges and Trapping

WARNING
Steam is a potentially dangerous fluid and should be treated with caution.
CAUTION
Any steam line being filled and pressurized will form a condensate.
This condensate can be carried by high-velocity steam, causing water hammer and possible failure of system components. The steam system must be adequately trapped to remove the condensate as it forms.
Install initial and reduced pressure gauges to indicate performance.
Trip Stop Main Valve

1. Flush the piping system thoroughly to clear it of dirt and debris.
2. Mount the trip stop the main valve with the diaphragm chamber down and the arrow on the body pointing in the direction of flow.
3. Screwed end valves should be mounted between unions.

Type P125 Pilot
CAUTION
Type P125 is a bracket-mounted pilot. Never mount the Type P125 by the pipe nipple. Cracking of the nipple and/or pilot body can occur causing steam to blow out.

1. Mount the bracket on the long stud extending above the trip stop main valve top flange. The bracket should be perpendicular to the pipe run. Tubing is supplied pre-bent when the Type P125 pilot and the trip stop the main valve are ordered together. No further bending is needed.
2. Connect the 1/4 NPT pipe tee installed on top of the trip stop pilot to the reduced pressure control point using 1/4 in. / 6.35 mm pipe. This is the Type P125 sensing line.
3. Pitch sensing line to avoid water pockets. Connect it to a dedicated connection on the top of the steam pipe.
4. Connect the vent line from the tee installed on top of the pilot to the pilot body. 5B open elbow is used at the body and 4B open straight coupling is used at the tee.
5. Connect the steam supply line from the upstream connection on the trip stop valve to the inlet connection on the bottom flange of the Type P125 trip stop pilot. This line must have the needle valve installed with a flow direction arrow away from the main valve. A 4B open straight coupling is used at the trip stop of the main valve and a 5B open elbow is used at the pilot.
6. Connect the pilot outlet to the trip stops main valve hood.

For Type E main valves without condensation chamber only (Figure 4):
a. Screw 5B open elbow into a tapped hole in the bottom of the diaphragm chamber. Connect this fitting with provided tubing to the 5B open elbow stamped “HOOD” in the Type P125 Pilot.
b. Install base bypass by screwing the 5B open elbow into a tapped hole in the upper diaphragm chamber and the 5B open elbow into a tapped hole on the outlet side of the trip stop the main valve.
For Type E2, E5, NPS 10 / DN 250 E or NPS 12/DN 300 E main valves only (Figure 5)
a. Install the condensation chamber using the long bolt provided.
b. Install 5B open elbows in the bottoms of the condensation chamber and diaphragm chamber. Connect these fittings together with the tubing provided.
c. Fill the condensation chamber with water.
d. Install 5B open elbow on top of the condensation chamber and connect to the 5B elbow stamped “HOOD” in the Type P125 trip stop pilot with tubing provided.
e. Install base bypass by screwing the 5B open elbow into a tapped hole in the upper diaphragm chamber and the 5B open elbow into a tapped hole on the outlet side of the trip stop the main valve.

Insulation
Insulation may only be applied to the globe and flanges of the trip stop the main valve.
Adjusting Pilot Trip Point
The Type P125 trip-stop pilot is factory set to trip at the specified pressure. Field adjustment of the trip set pressure should not be necessary and is not recommended. If the Type P125 trip stop pilot fails to trip at the desired pressure, refer to the Troubleshooting section or consult your Local Sales Office.

Start-up

(Figure 3)
WARNING
The pilot may be handling hazardous fluids. Only qualified personnel, who are familiar with the installation, should be permitted to install, readjust, inspect or maintain the pilot.
CAUTION
For a non-pressurized system, there must be no load.
The Trip Stop Station

1. Close all stop valves and the needle valve.
2. Remove any compression on the Type D Pilot spring and latch the Type P125 Pilot in the open position.
3. Crack open the stop valve and blow down the strainer upstream of the pressure-reducing main valve.
4. Open the 1/4 in. / 6.35 mm stop valve on the Type D Pilot sensing line. If the system is pressurized downstream, allow time for the pressure to feedback to the Type D Pilot and normalize between the pressure-reducing main valve and the trip-stop main valve.
5. Open blowdown on the strainer between the pressure-reducing main valve and the trip-stop main valve. If the system is pressurized downstream, note flow through the blowdown.
6. Apply compression to the Type D Pilot spring only until pressure reducing valve opens (audible flow) or an increase in flow is noticed through the strainer blowdown. Allow time to blow down the strainer.
7. Open 1/4 in. / 6.35 mm stop valve on Type P125 Pilot sensing line.
8. Open needle valve on Type P125 Pilot.
9. Crack open the stop valve downstream of the trip and stop the main valve.

For a Non-Pressurized System
With no load on the system, incrementally compress the Type D Pilot spring until desired downstream pressure is obtained. Alternately and incrementally open the upstream and downstream stop valves. The system is now ready for a load.
For a Pressurized System
Alternately and incrementally open the upstream and downstream stop valves. Make final adjustments on the Type D Pilot spring to obtain desired set pressure.
Restarting Type P125 After the Pilot has Tripped
After having determined and corrected the cause of the overpressure, if any setting has been changed, repeat the Startup procedure. Otherwise:

1. Close Type P125 needle valve.
2. Close the shut-off valve downstream of the trip and stop the main valve.
3. Re-latch the Type P125.
4. Open Type P125 needle valve.
5. Incrementally open downstream shutoff valve.

Maintenance

WARNING
To avoid personal injury, property damage, or equipment damage caused by the sudden release of pressure or the explosion of accumulated gas, do not attempt any maintenance or disassembly without first isolating the pilot from system pressure and relieving all internal pressure from the pilot.

Pilots that have been disassembled for repair must be tested for proper operation before being returned to service. Only parts manufactured by Emerson should be used for repairing this pilot.
Due to normal wear or damage that may occur from external sources, this pilot should be inspected and maintained periodically. The frequency of inspection and replacement of parts depends upon the severity of service conditions or the requirement of local, state, and federal rules and regulations.
Under normal conditions, the complete dismantling of trip-stop valves is not recommended. If it must be dismantled, contact your Local Sales Office.

• Periodically inspect the Type P125 pilot for trip arc clearance in the lever area.
• Inspect the latch pin, lever pin, and associated guides for accumulated dirt or corrosion.
• Lubricate guide/pin surfaces with light-grade machine oil.

Troubleshooting

WARNING
To avoid personal injury, property damage, or equipment damage caused by the sudden release of pressure or explosion of accumulated gas, do not attempt any troubleshooting or disassembly without first isolating the pilot from system pressure and relieving all internal pressure from the pilot.
Pilots that have been disassembled for repair must be tested for proper operation before being returned to service. Only parts manufactured by Emerson should be used for repairing this pilot.
Failure To Open
Check for positive inlet pressure. Check to see if the Pressure Reducing Valve is opened by opening the blow-down valve upstream of the trip stop the main valve.

• If the Type P125 Pilot is not in the lever latched position, close the needle valve, latch the lever, and repeat the Startup procedure.
• If the Type P125 Needle Valve is closed, check the needle valve and repeat the Startup procedure.
• Loosen 5B open elbow at the outlet of Type P125. If steam comes out, you have assured that steam is going through the pilot.

Failure To Trip

• Check the set pressure to see that it is not higher than desired. If so, consult your Local Sales Office.
• Ensure that the weight is not missing from the lever and replace it if necessary.
• Make sure there are no foreign objects restricting the lever’s movement and remove any obstructions.
• Check the lever pin for corrosion and remove, clean and lubricate if necessary.
• Correct the cause of the corrosion.

Pilot Trips And Main Valve Doesn’t Shut
Check Type P125 Pilot sensing line shut-off valve. Open it if it is closed. Carefully remove the bend and 5B elbow from the lower diaphragm chamber of the trip stop the main valve.

• If the trip stop main valve closes, check to see if the vent line is plugged or incorrectly installed.
• If the trip stop main valve does not close, it is wedged open. In this case, check for foreign objects between the seat and the disc of the trip stop main valve.
• All joints must be inspected periodically for leakage. Keep bolts and fittings tight.
• Never allow a leak to persist.

Testing Procedure
The purpose of the testing procedure is to confirm that:

• The control pipe is obstruction free.
• The pilot deletes.
• The pilot closes and shuts off.
• The trip stop main valve closes and shuts off.

The required installation is shown in Figure 6. The tests are conducted with the system pressurized and in running mode. Observe precautions necessary for safety and personal protection.
To Check Control Pipe for Obstructions:

1. Crack valve 2. Steam should blow through. If there is no steam flow, close valve 2 and clear the obstructed control pipe.
2. Close valve 1. Steam flow through valve 2 should cease.
3. Close valve 2 and open valve 1.

To Check trip stop pilot and main valves:

1. Isolate the main valve from downstream pressure by closing valve 4. Valve 3 is open.
2. Isolate the pilot from downstream pressure by closing valve 1.
3. Vent the pilot by opening valve 2.
4. Pressurize the pilot diaphragm by connecting an air pressure source to valve 2.
5. Trip the pilot valve by gradually increasing the air pressure to the pilot diaphragm. The valve should trip when air pressure reaches the set pressure. Do not overpressurize.
6. Vent the main valve body by cracking valve 5.
7. Observe valve 5 discharge. No steam flow should be seen. Wispy flash steam from the base cavity may be present. Blowing steam indicates the main valve is not closed or downstream pressure, if present, may be leaking through shutoff valve 4.
8. Close valve 5.
9. Close valve 2.
10. Open valve 1.
11. Open the needle valve and relatch the lever on the Type P125 Pilot.
12. Repeat the startup procedure for a pressurized system.

Parts Ordering

When ordering parts, it is essential that the pilot type, service, and serial number be stated.
Select part by item number, but order by part number.
Specify the complete part number when ordering.
Parts List

Key| Description| Part Number| Key| Description| Part Number
---|---|---|---|---|---
1| Cotter Pin, Steel (4 required)| WAL05-03265-00| 21| Cap Screw, Steel (2 required)| WAL05-04772-00
2| Hex Nut, Steel (16 required)| WAL05-02872-00| 22| Bonnet, Cast iron| WAL04-13944-00
3| Mounting Bracket, Steel| – – – – – – – – – – –| 23| Stem Bushing, Cast iron| WAL04-11094-00
4| Cap Screw, Steel (14 required)| WAL05-04771-00| 24| Disk and Seat assembly, 203 Lead| WAL02-08586-02
5| 1/4 NPT Pipe Plug, Steel| WAL04-03769-00| 25|  Gasket| WAL05-11718-00
6| Spring, OTS (2 required)
5 to 25 psi / 0.35 to 1.72 bar
10 to 50 psi / 0.69 to 3.45 bar
40 to 150 psi / 2.76 to 10.3 bar
150 to 175 psi / 10.3 to 12.1 bar| WAL05-05032-00
WAL00-15081-00
WAL05-05028-00
WAL05-05030-00| 26| Bottom Flange, Carbon steel| WAL04-14759-00
7| Spring Button, Ledloy (2 required)| WAL04-01053-00| 27| Diaphragm, 301 Stainless steel| WAL04-01629-01
8| Hex Nut, Steel (2 required)| WAL05-02877-00| 28| Pressure Plate, Cast iron| WAL04-03676-00
9| Standard, Redfin (2 required)| WAL04-05201-00| 29| Spring Yoke, Cast iron| WAL04-06178-00
10| Hex Nut, Steel (2 required)| WAL05-02874-00| 30| Pivot Pin, 416 Stainless steel (2 required)| WAL04-03215-00
11| Hood, Cast iron| WAL04-02640-00| 31| Trip Level, 17-4 PH| WAL04-13945-00
12| Cowl, Cast iron| WAL04-01513-00| 32| Weight, Cast iron| WAL04-06135-00
13| Guide Pin, Ledley| WAL04-03240-00| 33| Thumb Screw, Steel| WAL05-04880-00
14| Hex Nut, Steel (2 required)| WAL05-03014-00| 34| Set Screw, Steel| WAL05-04874-00
15| Trip Latch Stud Assembly, Steel| WAL07-42861-00| 35| Bellows Nut, Brass| WAL04-02911-00
16| Trip Latch Assembly, Steel| WAL07-40549-00| 36| Bellows, Brass| WAL05-17579-00
17| Base Bracket, Cast iron| WAL04-01001-00| 37| Cap Screw, Steel (8 required)| WAL05-04803-00
18| Stem Button, Brass| WAL04-01064-00| 38| Body, Cast iron| WAL04-11095-01
19| Adjusting Stem, Ledley| WAL04-05402-00| 39| 1/4 NPT Pipe Plug, Steel| WAL04-03772-00
20| Stop Nut, Brass| WAL04-02980-00| 40| Seat Ring, 420 FH Stainless steel| WAL04-11099-00

SpenceValve.com
Emerson Automation Solutions

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McKinney, Texas 75070 USA
T +1 800 558 5853
+1 972 548 3574| Asia Pacific
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T +65 6777 8211
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Europe
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T +39 051 419 0611| The Middle East and Africa
Dubai, United Arab Emirates
T +971 4 811 8100

VCIMD-14952 © 2021 Emerson Electric Co. All rights reserved. 11/21
Spence is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use, or maintenance of any product. Responsibility for the proper selection, use, and maintenance of any Emerson Electric Co. product remains solely with the purchaser.

www.SpenceValve.com
VCIMD-14952
November 2021
SD4103

Documents / Resources

| EMERSON Spence VCIMD-14952 Type P125 Trip Stop Pilot [pdf] Instruction Manual
Spence VCIMD-14952 Type P125 Trip Stop Pilot, VCIMD-14952, Type P125 Trip Stop Pilot, Trip Stop Pilot, Stop Pilot, Spence Stop Pilot
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