Most 3,000PSI User manual

Operation and Maintenance
Manual for MOST 3,000PSI and
5,000PSI Dual Pack Stuffing Box
(DPSB)
Revision 1 –May 2020

Table of Contents
Figures Index......................................................................................................................... 3
About This Manual ................................................................................................................ 4
Notes, Cautions, and Warnings.......................................................................................................4
Illustrations and Photographs................................................................................................ 4
Safety Guidelines................................................................................................................... 5
Description............................................................................................................................ 6
Dual Pack Stuffing Box (DPSB) –Threaded Base ..............................................................................7
Dual Pack Stuffing Box (DPSB) –Flanged Base.................................................................................8
Dual Pack Stuffing Box (DPSB) with Pivoting Base ...........................................................................9
Installation.......................................................................................................................... 10
Pre-Installation Inspection: ..........................................................................................................10
Installation –Flanged Bottom:......................................................................................................10
Installation –Threaded Bottom:...................................................................................................11
Operation............................................................................................................................ 11
Compressing the Packing:.............................................................................................................11
Preventative Maintenance .................................................................................................. 12
Inspection of an operating stuffing box:........................................................................................12
Internal Threads: .........................................................................................................................12
External Threads:.........................................................................................................................12
Bolts and Flanges:........................................................................................................................12
Ring Gaskets:...............................................................................................................................13
Spares and Replacement Parts: ....................................................................................................13
Five Year Maintenance ........................................................................................................ 13
Servicing ............................................................................................................................. 14
Field Service: ...............................................................................................................................14
Servicing the Top Section:..................................................................................................................14
Servicing the Bottom Section:............................................................................................................14
Complete Overhaul:.....................................................................................................................15
Top Section:........................................................................................................................................15
Bottom Section:..................................................................................................................................15
Pivoting Section (if equipped):...........................................................................................................15

Figures Index
Figure 1:Dual Pack Stuffing Box (DPSB) –Threaded Base .............................................................. 7
Figure 2:Dual Pack Stuffing Box (DPSB) –Flanged Base ................................................................. 8
Figure 3: Dual Pack Stuffing Box (DPSB) with Pivoting Base........................................................... 9

About This Manual
Notes, Cautions, and Warnings
Notes, cautions and warnings are used throughout this manual to provide readers with
additional information and to advise the reader to take specific action to protect personnel
from potential injury or lethal conditions. They are also used to inform the reader of actions
necessary to prevent equipment damage. Please pay close attention to these messages.
Notes provide useful information and tips that can make the operator’s job easier. Those are
identified with
Cautions are identified with the caution symbol (symbol), this indicates that the potential
damage to equipment or injury to personnel exists. Extreme care should be taken when
performing operations or procedures preceded by this caution symbol.
Warnings are identified with the warning symbol (symbol), this indicates a definite risk of
equipment damage or danger to personnel. Failure to observe and follow proper procedures
could result in serious or fatal injury to personnel, significant property loss, or significant
equipment damage.
Illustrations and Photographs
The illustrations and photographs in this manual provide graphical examples of equipment.
These examples are not intended to represent every possible situation and will vary in
appearance to the actual equipment.

Safety Guidelines
Observe the minimum safety precautions listed below and all safety precautions provided
throughout this manual. Following these precautions will protect you and others from injury or
death and prevent equipment damage and environmental impact.
•Follow all customer safety guidelines.
•Stand upwind when installing or dismantling equipment.
Hydrogen sulfide gas (H2S) may be present in high concentrations. You
must have proper H2S detection equipment with you and practice all
recommended safety precautions when working around wellheads.
•Live or discharging equipment possess certain hazards that require the awareness and vigilance
of operators.
You MUST avoid conducting any repair or maintenance work while the
equipment is in operation. Follow proper lockout / tagout procedures
before staring any work on the equipment. Failure to heed this warning
can result in severe injury or death.
Installation, repair, or maintenance of equipment should only be done
while wearing proper PPE. Failure to do so could result in severe injury or
death.
•Equipment should be used for its intended purpose only.
MOST Stuffing Boxes are designed to perform specific functions and
should only be used for those applications.

Description
Stuffing Boxes are a safety equipment on the wellhead that are used to prevent leakage and
uncontrolled spillage of wellbore fluid. This is achieved by using packing that is compressed
against the polished rod to maintain a seal.
MOST has almost 2 decades of experience in manufacturing wellhead equipment for oilfield
service. MOST is certified with ISO and API under ISO 9001-2015, API Q1, and API6A Wellhead
and Christmas Tree Equipment. This ensures that MOST stuffing boxes are of the highest quality
and are fully compatible with API equipment.
MOST stuffing boxes are available in various pressure ratings, including 1,500 PSI, 3,000 PSI and
5,000 PSI. Based on the application, MOST stuffing boxes can be configured with different kinds
of packing materials depending on the temperature and service conditions.
Verify the pressure rating, configuration, and the temperature rating of your stuffing
box to ensure that it fulfills the requirements of the application.

Dual Pack Stuffing Box (DPSB) –Threaded Base
Figure 1:Dual Pack Stuffing Box (DPSB) –Threaded Base
1. Cap
2. Mid Section
3. Brass Block
4. Lantern Ring Parts may vary depending on stuffing box
5. O-Ring model. Please refer to specific sales
6. Packing drawings and Bill of Materials for part
7. BaseSection numbers and quantities.
8. Brass Insert

Dual Pack Stuffing Box (DPSB) –Flanged Base
Figure 2:Dual Pack Stuffing Box (DPSB) –Flanged Base
1. Cap
2. Mid Section
3. Packing
4. Brass Block Parts may vary depending on stuffing box
5. Lantern Ring model. Please refer to specific sales
6. Socket Head Cap Screw drawings and Bill of Materials for part
7. Brass Insert numbers and quantities.
8. Base Section
9. O-Ring
10. Flapper (if equipped)
11. Flanged Base

Dual Pack Stuffing Box (DPSB) with Pivoting Base
Figure 3: Dual Pack Stuffing Box (DPSB) with Pivoting Base
1. Cap
2. Brass Block
3. Packing
4. Lantern Ring
5. Mid Section Parts may vary depending on stuffing box model
6. Base Section Please refer to specific sales drawings and
7. Socket Head Cap Screw Bill of Materials for part numbers and
8. Brass Insert quantities.
9. O-Ring
10. O-Ring
11. O-Ring
12. O-Ring
13. Pivoting Section

Installation
This manual provides a guideline for installation and use of a MOST stuffing box.
Always follow local and company safety requirements when working around an oil
well.
Pre-Installation Inspection:
MOST stuffing boxes are manufactured according to the requirements of API 6A and are fully
tested before leaving the factory.
1. Prior to installation, it should be confirmed that all required installation materials are on hand.
2. Carefully inspect the stuffing box to ensure that there is no damage or missing parts
3. Visually inspect the ring grooves and threaded connections (as applicable) for damage prior to
installation.
4. Confirm that the flanges and connections on the stuffing box are compatible with the
equipment and hardware that are going to be connected.
5. Confirm that the packing in the stuffing box is of the correct type and free from damage.
Installation –Flanged Bottom:
Follow appropriate safety procedures for lifting, moving, and working around the
stuffing box and related equipment.
1. Ensure that the stuffing box is installed right side up.
2. Confirm that all threaded box and pin connections are clean before threading in the stuffing
box. Do not cross-thread.
The stuffing box can safely be installed over the polished rod thread protector, provided the
thread protector is not larger than the polished rod.
3. Make flanged/studded connections as per standard company API procedure.
Only use new ring gaskets. Ring gaskets deform during installation, and there is no
guarantee that a used ring gasket will function correctly.
4. Perform visual inspection to ensure the installation was successful.