MIYAWAKI SD1 User manual

THERMODYNAMIC STEAM TRAP
USER'S MANUAL

SAFETY GUIDE
The model SD1 is a compact stainless steel disc-type steam trap.
In order to get maximum benefit from this product, be sure to read this
manual before installing it.
The following warnings and cautions are shown at appropriate
places in this manual.
WARNING
Failure to observe this type of precaution may
lead to serious injury or death.
CAUTION
Failure to follow this type of precaution can
lead to injury or damage to equipment and
property.
Table of Contents
1 SPECIFICATIONS AND MARKINGS 1
2 CONSTRUCTION DETAILS 2
3 INSTALLATION 3
4 OPERATION 4
5 MAINTENANCE 5
6 TROUBLESHOOTING 8
7 WARRANTY 9
8 SERIAL NUMBER (S. No.) DESIGNATION 10
9 GUIDANCE FOR READING SPECIAL PRODUCT
NAME 11

1
1 SPECIFICATIONS AND MARKINGS
WARNING
Be sure not to use this product at higher pressures than the specified maximum
allowable pressure (PMA) or at temperatures higher than the specified maximum
allowable temperature (TMA).
The following items are displayed on the name plate or the side of the product.
Check each item to avoid misuse of the product.
1) Maximum allowable pressure (PMA): 3.1 MPa (450 psig)
2) Maximum allowable temperature (TMA): 400 °C (752 °F)
3) Maximum Operating pressure (PMO): 3.1 MPa (450 psig)
(Shown as MAX. P. on the name plate)
4) Maximum operating temperature (TMO): 400 °C (752 °F)
(Shown as MAX. T. on the name plate)
5) Size: 8 mm (1/4”), 10 mm (3/8”), 15 mm (1/2”)
6) Year of production: The two leftmost digits in the four-digit or nine-digit “S. No.” on
the name plate are the last two digits of the year of production.
7) Flow direction: Shown by an arrow
8) Body material: Stainless Steel SUS420J2
9) Model symbol: Showing the product model name
 Some pictures and illustrations in this manual are examples of the model SD1. For more details
regarding dimensions and other specifications, please refer to the catalog.
The model SD1 fully complies with the requirements of the European Pressure Equipment
Directive 2014/68/EU. It is classified according to Article 4, Section 3 of the PED, which
does not allow to bear the CE marking.

2
2 CONSTRUCTION DETAILS
1. Body
2. Disc
3. Cap
4. Cover
5. Plug
6. Screen
37. Name Plate
(4) (3)
(5)
(6)
(37)
(1)
(4)
(3)
(2)
(5)

3
3 INSTALLATION
WARNING
Pay very careful attention when working in hazardous environments. There is a risk
of explosion and the possibility of dangerous gases leaking. Always check whether
the pipeline contains flammable, high pressure or high temperature materials
before starting to work.
 Make sure that isolation valves are installed on both the upstream and downstream
lines.
CAUTION
Before installing the product, open both isolation valves and the bypass valve, if
one exists, to blow out any debris or dirt inside the pipeline. After blowing out the
line, before starting to work, close the isolation valves and allow time for the
temperature to drop to a safe working temperature.
When installing the product, be sure to leave clearance for maintaining it.
1) Remove the dustproof seals covering both connections.
※Products shipped in plastic bags may not have dustproof seals.
2) Check the flow direction indicated on the side of the body.
3) The SD1 can be used for both horizontal and vertical lines. However, when
installing a SD1 in a horizontal line, be sure to maintain a slight slope to the line, so
that any condensate will flow smoothly.
4) Open the isolation valve on the upstream line and make sure the product works
normally.
Upstream line Downstream line
Clearance for
maintenance:
More than 30 mm
Clearance for
maintenance:
More than 30 mm
Flow direction is
indicated by an
arrow.

4
4 OPERATION
CAUTION
Before starting operation, open the bypass valve or blow valve completely and blow
off the scale in the piping.
4.1 Operation procedure
1) After blowing off the scale from the piping, close the bypass valve or blow valve.
2) Open the stop valve on the trap outlet side.
3) Open the stop valve on the trap inlet side.
4.2 Stop procedure
1) Close the stop valve on the trap inlet side.
2) Close the stop valve on the trap outlet side.
* When stopping for a long time, completely drain the condensate from the piping and trap
and close the valves before and after the trap.

5
5 MAINTENANCE
WARNING
 Before removing the trap from the pipe or disassembling it, be sure to close the
isolation valves. Then, release the residual pressure from the trap body (make
sure that the pressure in the main body is equal to the atmospheric pressure).
After it has fully cooled down (after the temperature of the main body has
reached ambient temperature), confirm for safe conditions and then begin work.
 Even when the isolation valves are closed, there may be residual internal
pressure due to leaks from the isolation valves. Therefore, be very careful.
CAUTION
 When replacing parts, make sure the replacement parts are supplied by
MIYAWAKI.
The performance of steam traps deteriorates gradually over time due to wear, corrosion
or dirt accumulating around the valve and the valve seat. Please conduct periodic
diagnosis of traps in order to keep steam control systems and equipment working well.
5.1 Tools for Diagnosing Steam Traps
 Dr. Trap
Dr. Trap is a sophisticated steam trap management system for diagnosing steam traps
automatically by measuring the vibration and temperature of the steam trap. Survey
results are stored in the testing equipment and transferred to a steam trap analysis
software. The software aggregates and analyses steam trap survey data, identifying
faulty steam traps, providing steam loss and financial loss data, estimating CO2
emissions corresponding to leaking steam traps and providing many other analyze
possibilities to manage the steam trap population easily.
 Dr. Trap Jr.
Dr. Trap Jr. is an inexpensive and easily to handle steam trap diagnostic system
consisting of an ultrasonic checker, temperature probe and a sophisticated analysis
software. The software allows to determine the condition of a steam trap, to estimate
steam and financial losses and the related CO2 emissions.
For more details, please, check our homepage:
https://www.miyawaki.net/en/products/steam-trap-management-system
or ask our local representative.

6
5.2 Repairs
When a trap fails, it is necessary to clean the internal parts and to replace damaged parts.
Take the failed trap apart following the steps below.
5.2.1 Disassembling the trap
1) Remove the cover (4). *Use a flat-blade screwdriver to remove the cover.
2) Remove the cap (3) by turning it counterclockwise.
3) Remove the disc (2).
5.2.2 Disassembling the screen
1) Turn the plug (5) counterclockwise to remove it.
2) Remove the screen (6).
After cleaning the trap and replacing damaged parts, reassemble the parts in
reverse order as follows.
5.2.3 Reassembling the screen
1) Put the screen (6) back on the plug (5).
2) Then fasten the plug (5).
5.2.4 Reassembling the trap
1) Put the disc (2) on the seat surface of the body (1).
*The groove of the disc should point to the seat of the trap.
4) Fasten the cap (3).
5) Put the cover (4) on the cap (3).
Torque table
Parts Tools Across the flats Torque
Cap (3) Torque wrench 29 mm (1.14”) 65 N∙m
Plug (5) Torque wrench 23 mm (0.91”) 65 N∙m

7

8
6 TROUBLESHOOTING
Problem Possible cause Solution
Steam leaks or blows
through.
Dirt is stuck around the disc
(2) or the seat of the body (1).
Clean the disc (2) and the
seat.
Damage, wear or corrosion of
the disc (2) Replace the damaged part. *1
Damage, wear or corrosion of
the seat of the body (1). Replace the damaged part. *2
The back pressure is too high.
(The back pressure must be
less than 50% of the inlet
pressure.)
Replace the trap with an
appropriate trap.
Steam leaks
from the
body.
From the cap
connection The cap (3) is loose. Tighten the cap (3). *3
From the
plug
connection
The plug (5) is loose. Tighten the plug (5). *4
Insufficient condensate
discharged, or no
condensate discharged.
The screen (6) is clogged. Clean the screen (6).
Dirt has built up around the
disc (2) and the seat of the
body (1).
Clean the disc (2) and the
seat.
Dirt has built up in the fluid
path inside the body (1).
Clean the body (1).
Insufficient condensate
capacity.
Replace the trap with a larger
capacity trap.
Wrong installation direction Reinstall the product in the
correct direction.
*1 and *2: The seat surfaces of the disc and body are lapped to fit each other precisely.
Therefore, when replacing either the disc or the body, replace them as a pair.
*3 and *4: Refer to the torque table in Section 5, “Maintenance” to retighten the parts with
the correct torque.