Spirax Sarco MSC-P Series User manual

IM-P117-36 ST Issue 1 1
MSC-P and MSC-N Manifolds
for Steam Distribution and Condensate Collection
Installation and Maintenance Instructions
1. Safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
Printed in the UK © Copyright 2007
IM-P117-36
ST Issue 1
1170850/1
MSC04-P shown

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2

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Safe operation of this product can only be guaranteed if it is properly installed,
commissioned, used and maintained by qualified personnel (see Section 1.11) in
compliance with the operating instructions. General installation and safety
instructions for pipeline and plant construction, as well as the proper use of tools
and safety equipment must also be complied with.
Warning
The graphite stem sealing rings contain thin stainless steel support rings which
may cause physical injury if not handled and disposed of carefully.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended use / application.
The products listed below comply with the requirements of the European Pressure
Equipment Directive 97 / 23 / EC and carry the mark when so required. The products
fall within the following pressure Equipment Directive categories:
Products Group 2 Group 2
Gases Liquids
Manifolds MSC04-P, MSC08-P, MSC12-P 1 SEP
Note: MSC04-N, MSC08-N and MSC12-N do NOT comply with the requirements of the
European Pressure Equipment Directive 97 / 23 / EC.
i) The product has been specifically designed for use on steam, air or water /
condensate. The products’ use on other fluids may be possible but, if this is
contemplated, Spirax Sarco should be contacted to confirm the suitability of
the product for the application being considered.
ii) Check material suitability, pressure and temperature and their maximum and
minimum values. If the maximum operating limits of the product are lower than
those of the system in which it is being fitted, or if malfunction of the product
could result in a dangerous overpressure or overtemperature occurrence, ensure
a safety device is included in the system to prevent such over-limit situations.
iii) Determine the correct installation situation and direction of fluid flow.
iv) Spirax Sarco products are not intended to withstand external stresses that may
be induced by any system to which they are fitted. It is the responsibility of the
installer to consider these stresses and take adequate precautions to minimize
them.
v) Remove protection covers from all connections and protective film from all
name-plates, where appropriate, before installation on steam or other high
temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded)
before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1. Safety information

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1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some
previous time. Consider: flammable materials, substances hazardous to health,
extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,
extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive
noise, moving machinery.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any
proposed action (e.g. closing isolation valves, electrical isolation) put any other part
of the system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering
ineffective of controls or alarms. Ensure isolation valves are turned on and off in
a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling of
closed valves. Do not assume that the system has depressurised even when the
pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and /or consumables
available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and /or others in the vicinity require any protective clothing
to protect against the hazards of, for example, chemicals, high /low temperature,
radiation, noise, falling objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the
product according to the Installation and Maintenance Instructions.
Where a formal ‘permit to work’ system is in force it must be complied with. Where
there is no such system, it is recommended that a responsible person should know
what work is going on and, where necessary, arrange to have an assistant whose
primary responsibility is safety.
Post ‘warning notices’ if necessary.

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1.12 Handling
Manual handling of large and /or heavy products may present a risk of injury. Lifting,
pushing, pulling, carrying or supporting a load by bodily force can cause injury
particularly to the back. You are advised to assess the risks taking into account the
task, the individual, the load and the working environment and use the appropriate
handling method depending on the circumstances of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the
maximum permitted operating conditions the surface temperature may reach
temperatures in excess of 425°C (797°F).
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation (refer to ‘Maintenance instructions’).
1.14 Freezing
Provision must be made to protect products which are not self-draining against
frost damage in environments where they may be exposed to temperatures below
freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this
product is recyclable and no ecological hazard is anticipated with its disposal
providing due care is taken.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safet y and
Environment Law, when returning products to Spirax Sarco they must provide
information on any hazards and the precautions to be taken due to contamination
residues or mechanical damage which may present a health, safety or environmental
risk. This information must be provided in writing including Health and Safety
data sheets relating to any substances identified as hazardous or potentially
hazardous.

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2.1 Description
A range of forged carbon steel compact manifolds with integral piston type stop valves
for steam distribution and condensate collection duty.
MSC-P and MSC-N manifolds can be used for either steam distribution duty or condensate
collection duty depending on the way they are installed.
Available types, sizes and connections
MSC-P or N manifolds are available with 4, 8 or 12 connections designated: MSC04-P or N,
MSC08-P or N and MSC12-P or N respectively. As standard they are available with the
following connections:
Socket weld to ANSI B 16.11 Class 3000.
Screwed BSP or NPT.
The steam main / condensate return connection is 1½" SW.
The tracer line and drain connections are available as ½", ¾" flanged, screwed BSP, NPT
and SW to ANSI B 16.11.
Please note: Other connections are available upon request.
Optional extras
The following are available at extra cost:
- Mounting kit comprising of studs, spacers and nuts.
- Insulating jacket for body and flanges.
Standards
The MSC-P fully complies with the requirements of the European Pressure Equipment
Directive 97 / 23 / EC.
Certification
This product is available with certification to EN 10204 3.1. Note: All certification / inspection
requirements must be stated at the time of order placement.
Note: For further product data see the following Technical Information sheet TI-P117-35.
2. General product information
Alternatives
Flow direction when used for Flow direction when used for
steam distribution duty condensate collection duty
Fig. 1 Type MSC04-P socket weld version shown

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Pressure bar g
Temperature °C






    







      
Pressure psi g
Temperature °F
2.2 Pressure / temperature limits
The product must not be used in this region.
A - B Flanged ANSI Class 300, screwed and socket weld.
A - C Flanged ANSI Class 150.
Body design conditions ANSI Class 300 (PN50)
PMA Maximum allowable pressure 51 bar g @ 38°C (740 psi g @ 100°F)
TMA Maximum allowable temperature 425°C @ 28 bar g (797°F @ 406 psi g)
Minimum allowable temperature -29°C (-20°F)
Maximum operating ANSI 150 14 bar g (203 psi g)
PMO pressure for saturated
ANSI 300, 41.5 bar (602 psi g)
steam service SW, BSP, NPT
Maximum operating ANSI 150 425°C @ 5.5 bar g (797°F @ 80 psi g)
TMO temperature ANSI 300,
SW, BSP, NPT 425°C @ 28 bar g (797°F @ 406 psi g)
Minimum operating temperature 0°C (32°F)
Note: For lower operating temperatures consult Spirax Sarco.
Designed for a maximum cold hydraulic test pressure of: 76 bar g (1102 psi g)
2.3 Kv values
All sizes Kv 1.8
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
The Kv stated is for each valve rather than the complete manifold.
C B
A
Steam
saturation
curve

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3. Installation
Note: Before actioning any installation observe the ‘Safety information’ in Section 1.
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended installation:
3.1 Check materials, pressure and temperature and their maximum values. If the maximum
operating limit of the product is lower than that of the system in which it is being fitted,
ensure a safety device is included in the system to prevent overpressurisation.
3.2 Determine the correct installation situation and the direction of fluid flow.
3.3 Remove protection covers from all connections and protective film from all name-
plates, where appropriate, before installation on steam or other high temperature
applications.
3.4 General information - The manifold has been designed for vertical installation. Ensure
that there is sufficient access to the handwheel to allow proper operation. The back is
provided with M12 threaded connections for attaching to a supporting structure.
For ease of insulation it is recommended that spacers are fitted to give the manifold
a stand-off of at least 50 mm.
For convenience the following sets of
mounting kit are available:
- A single set comprising 2 off each stud,
nut and spacer suitable for installing one
MSC04-P or N and MSC08-P or N.
- A single set comprising 4 off each stud,
nut and spacer suitable for installing
one MSC12-P or N.
- A multiple set comprising 12 off each
stud, nut and spacer suitable for installing
6 x MSC04-P or N, 6 x MSC08-P or N
and 3 x MSC12-P or N.
After installation it is recommended that
the manifold is insulated to minimise
radiated heat losses and to protect
personnel from burn risks. This is most
easily done using the optional insulating
jacket.
Note: If the trap draining the manifold is
to discharge to atmosphere ensure it is
to a safe place, the discharging fluid may
be at a temperature of 100°C (212°F).
3.5 Steam distribution duty - The recommended installation is with the steam inlet
connection at the top of the manifold. A trap set should be fitted to the bottom.
The discharge from this trap set should ideally be returned. If it is to be discharged
to atmosphere we recommend that a diffuser is fitted.
3.6 Condensate collection duty - The recommended installation is with the condensate
outlet at the top. The bottom of the manifold should be fitted with a stop valve for
blowdown purposes. Again, we recommend that a diffuser is fitted.
3.7 Pipeline welding - When installing any welding should be carried out to an approved
procedure of a recognised standard.
Fig. 2 Installation view
Structural
steelwork
M12 stud M12 nut
Spacer
MSC-P or MSC-N manifold
50 mm

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Fig. 2 Installation view
After installation or maintenance ensure that the system is fully functioning. Carry out tests
on any alarms or protective devices.
The integral piston valves should be either fully open or fully closed. They are not intended for
throttling duties. The rising handwheel of the integral piston valves provides an indication of
the amount of valve opening.
During closing operation the piston ensures a permanent seal by means of the handwheel.
Therefore during service never remove the handwheel from the piston. Due to the large sealing
area of the piston valve, it is not necessary to use a valve key to ensure leaktight shut-off.
During opening operation the piston is stopped when the valve is fully open as its top
touches the inside of the bonnet.
Operation of the handwheel should always be by hand, it is not necessary to use
a valve key.
4. Commissioning
5. Operation
Note: Before actioning any maintenance programme observe
the ‘Safety information’ in Section 1.
Warning
The graphite stem sealing rings (items 2 and 3) contain thin stainless steel support rings
which may cause physical injury if not handled and disposed of carefully.
6.1 Maintenance in service
After the manifold has been in service for 24 hours (when it has been first installed or after
maintenance has been carried out) verify the bonnet nuts (10) are tightened to the correct
torque with the valve in the closed position. Ensure the bonnet (8) is driven down straight during
tightening and that care is taken with the handwheel operation. This operation is to be repeated
should any trace of leakage develop. If perfect sealing cannot be acheived in this way, repack
the valve following the procedure below.
A small diameter hole evident in the bonnet is primarily to prevent pressurisation within the
bonnet, but is useful for observing leaks past the upper sealing ring and for lubrication of the
piston (5) when the valve is closed.
6. Maintenance
2351086
Fig. 3 View showing valve internals

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6.2 Preparation of valve dismantling
Before starting work ensure that you have suitable tools and /or consumables available. Before
attempting to carry out any maintenance, ensure that the manifold is fully isolated and safely
depressurised. Do not assume the system is depressurised even when the pressure gauge
indicates zero. If maintenance is being actioned whilst the pipework is hot, wear appropriate
protective clothing. Carefully remove insulation if fitted. When using the optional insulation jacket,
this is easily removed by undoing the fastenings.
6.3 Dismantling the valve:
- Using the handwheel (6), fully open the valve.
- Remove the nuts (10) and washers (11) from the studs (9).
- Carefully turn the handwheel in the closing direction to lift the bonnet (8).
- Rotate the bonnet (8) to ensure that the flange bolt holes are misaligned with the studs (9).
- Turn the handwheel in the opening direction to release the piston (5) from the sealing rings
(2 and 3) and so release the piston / bonnet sub-assembly from the body.
- Examine the piston (5) for signs of scoring, corrosion etc., which could affect perfect
tightness of the valve.
- Check other parts for wear / damage and replace if necessary.
6.4 Repacking the valve:
- With the valve dismantled, insert the valve internals extractor tool (Figure 5) through the
sealing rings (2 and 3) and the lantern bush (4).
- Firmly tap to ensure that the tool bottoms out in the bore and with a quarter turn of the
handle carefully remove the two sealing rings (2 and 3) and the lantern bush (4).
- Thoroughly clean the sealing ring housing and all the internals.
- Fit new lower sealing ring (2), lantern bush (4) and new upper sealing ring (3), ensuring they
fit perfectly. (Note: The lower and upper rings are the same). Use the Inserter tool
(Figure 6) for fitting sealing rings.
- Apply a thin layer of graphite based grease to threads only (not to internals and piston).
6.5 Reassembling the valve:
- Take the piston / bonnet sub-assembly and turn the handwheel (6) in the opening direction
up to the stop.
- Insert piston (5) into the upper sealing ring and push it down until it is possible to fit
washers (11) and screw nuts (10) onto the studs (9) and then hand tighten.
- Shut the valve fully, ensuring that the bonnet (8) is driven down straight, gradually tighten
the nuts (10) to the receommended torque (see Table 1).
- Replace any insulation.
Table 1 Recommended tightening torques
Item
or
N m (lbf ft)
mm
7 10 A /F M6 0.1 (0.07)
10 14 A/F M8 9 - 10 (6.6 - 7.4)
435111086
Fig. 4
29
MSC-P
or
MSC-N

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Fig. 6 View showing valve inserter tool
Fig. 5 View showing valve extractor tool
Extractor
Inserter
Lower sealing ring Lower sealing ring
Upper sealing ring
Lantern bush
Bush to remove
sealing rings from
extractor tool

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7. Spare parts
The spare parts available are detailed below. For ease of replacement an extractor tool and
inserter tool are available for removing and replacing the sealing rings respectively.
Available spares
Sealing ring set (set of 10 rings) 2, 3
Sealing ring set (set of 2 rings) 2, 3
Lantern bush 4
Valve internals set, consisting of: Piston 5
Handwheel nut 7
Washer (2 off) 12
Extractor tool & Inserter tool See Figures 5 and 6, page 11
Mounting kit See Section 3.4, page 8
How to order spares
Always order spares by using the description given in the column headed 'Available spares'
and state the type and size of manifold.
Example: 1 off Sealing ring set for an integral piston valves on a carbon steel manifold
MSC04-P ½" socket weld.
Fig. 7 Type MSC04-P socket weld connections shown
12
7
12
5
3
4
2