Baker Hughes Masoneilan 41005 Series, Инструкция по эксплуатации

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Masoneilan 41005 Series Globe Valves with API-6A Capabilities Instruction Manual
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E. Replace packing follower (23) and packing flange (4).
F. Replace and tighten packing stud nuts (3).
CAUTION
CAUTION
WARNING
DANGER
Do not over tighten.
G. Place valve back in service and only tighten packing as
necessary to stop external leakage.
Note: In an emergency, string packing may be used
as a temporary repair only. It must be replaced with
the correct packing as soon as possible.
5.1.2 Flexible Graphite Rings
Note: Flexible graphite packing rings replacement may
require disconnecting the plug stem from the actuator stem
and removal of the actuator if rings are not skive cut.
A.
Loosen and remove packing flange nuts (3).
B. Remove packing flange (4) and packing follower (23)
from the plug stem.
C.
By means of a hooked instrument, remove packing
(6) ensuring not to damage the sealing surfaces of the
packing box or plug stem.
Note: On valves equipped with an optional lubricator
connection, the lantern ring must also be removed to
gain access to lower packing rings.
D. Replace new packing set (6); first assemble a back-up
ring (Graphite Filament Yarn braided ring), then the
flexible graphite rings (smooth rings), and finally another
braided back-up ring.
Note: Assemble and compress rings one at a time
into packing box.
Note: On valves equipped with an optional lubricator
connection, pay close attention to the number and
order of packing rings an lantern are arranged. This
will help with assembly.
E.
Assemble packing follower (23) and packing flange (4).
F.
Assemble and tighten packing stud nuts (3).
CAUTION
CAUTION
WARNING
DANGER
Do not over-tighten.
G. Proceed to appropriate instructions for actuator and valve
assembly adjustment.
H. Place valve back in service and only tighten packing as
necessary to stop external leakage.
5.1.3 Low-E Packing
The Masoneilan Low-E (Low Emissions) Packing from Baker
Hughes is a high performance packing system capable of
containing fugitive emissions well below the specifications of
the most severe recommendations. It is also available as fire
proof configuration if required.
The packing is provided as a set of rings consisting of middle
rings and bound by end rings also referred to as anti-extrusion
rings. All of our Low-E solutions come with Live Loading
which is imperative to maintain a constant load on the packing
and is necessary for thermal cycling applications.
Applied properly, this packing exhibits below current
regulations. Consequently, it can effectively prevent fugitive
emissions leaks from a control valve. The Low-E packing
system can directly replace conventional packing, requiring no
modification to the control valve or actuator.
The packing material could vary depending on the
specifications and timing when the valve was ordered. It is
important to understand the specific packing material that is
being replaced.
Installation should be performed by a qualified technician.
The following paragraphs will provide guidance while Packing
Manual Ref. 34620 is also available.
5.1.3.1 Preparation
5.1.3.1.1 Stem
Inspect stem for any nicks or scratches on the surface
finish. Reject the stem for any of these reasons as they
may damage packing.
Note: A properly etched part number on the stem in
the packing area will have no adverse effect on the
performance of the packing.
Stem finish should be 3-7 AARH (Ra 0,1/0,2).
5.1.3.1.2 Packing Box
Note: Bonnets that have a lube hole or leak detection
port are unacceptable for use with the packing
arrangement.
CAUTION
CAUTION
WARNING
DANGER
Packing box should be clean and free of burrs, rust,
and any foreign matter. Parts can be cleaned with
denatured alcohol.
Note: Packing box finish should be 125 AARH (Ra 3,2) or
better.
The packing box may be bored or honed oversize by up to
0.015” (0.38 mm) above the nominal diameter to improve
the finish. For instance, a nominal 0.875” (22.22 mm)
packing box may be bored or honed up to 0.890”
(22.60 mm) and the LE Packing will still seal properly.
Packing box must be finished to the bottom of the
bore.
5.1.3.1.3 Packing
Inspect packing rings. DO NOT use packing if any nicks
or scratches on packing are observed. Check packing
instructions to ensure that it is in proper arrangement
(different packing materials contain arrangements specific to
the design).
5.1.3.2 Packing Installation
a. Refer to the packing instructions that were provided
with the packing for proper installation.