Yoshitake ST-1 User manual

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EPDT-253b
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MODEL ST-1
STRAINER
PRODUCT MANUAL
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Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the product,
please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Caution
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
1. Overview································································· 1
2. Features·································································· 1
3. Specifications ··························································· 1
4. Dimensions······························································ 1
5. Nominal Size Selection··············································· 2
5.1 Selection of nominal size ······································· 2
5.2 Selection of nominal pipe size ································· 2
6. Precautions for Operation············································ 3
7. Precautions for Removal from Piping after Brushing ·········· 3
8. Piping Example························································· 3
Warranty Information

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EPDT-253b
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1. Overview
The ST-1 corn-type temporary strainer is widely used for dust removal in various types of pipelines and for
flushing at start-up of operation.
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Features
The product is a simple strainer to be placed between the flanges of short pipes.
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. Specifications
Model ST-1-10 ST-1-20 ST-1-30 ST-1-40
Application Steam, air, cold and hot water and other non-dangerous fluids
Max. pressure 1.0 MPa 2.0 MPa 3.0 MPa 4.0 MPa
Max. temperature 220°C
Material Stainless steel
Screen Perforations φ8-11
P
Mesh Standard 80 mesh
Available with 20 to 250 mesh filter upon request.
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. Dimensions
Nominal size: 25A-65A Nominal size: 80A-300A
For the product with high pressure
resistance or with mesh size of 150 or more,
its structure differs from the above.
[mm]
Nominal
size d
1
d
2
H l
D
ST-1-10 ST-1-20 ST-1-30 ST-1-40
25A
24
46 65
71 71 76 76
32A
30
55 65
81 81 85 85
40A
38
73 65
86 86 97 97
50A
48
93 65
101 101 111 111
65A
60
118
65
121 121 137 137
80A
72
36
110
70
131 137 147 147
100A
95
48
135
70
156 162 170 180
125A 118
60
165
70
187 200 205 223
150A
142
72
195
85
217
235
248
262
200A
188
95
250
85
267
280
293
312
250A
235
119
330
85
330
353
357
377
300A
280
141
395
85
375
403
417
431

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EPDT-253b
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5. Nominal Size Selection
To make the best use of the product and to satisfy the operating requirements to the maximum, take
notice of the following.
4.1 Selection of nominal size
Select a nominal size of the product equivalent to that of the pipe (nominal pipe size = nominal size
of strainer). Note that use of a smaller nominal size increases the pressure loss through the strainer,
and may possibly reduce the equipment inlet pressure below the specified limit.
4.2 Selection of nominal pipe size
When selecting an appropriate nominal pipe size, it is necessary to consider fluid type, maximum flow rate,
permissible pressure loss, costs of piping and equipment, etc. If the nominal pipe size is smaller, the costs
of piping and equipment decreases while the pressure loss through the pipe increases to generate
disturbances, possibly resulting in pipe wear, noise and/or vibration. If the nominal pipe size is too large,
not only the costs of piping and equipment but also the thermal loss increase. As a reference, the
standard flow velocity is specified in the Japanese Industrial Standards (JIS) as a guide to select an
appropriate nominal pipe size. See the following table.
<<Standard flow velocity>>
Fluid Remarks Standard flow
velocity
Saturated steam
Auxiliary piping for vacuum or
small-
diameter piping
15 m/s [10-20]
Large-diameter piping 30 m/s [20-40]
Superheated steam Piping diameter: approx. φ75 – φ250 40 m/s [30-50]
Piping of high-grade material 70 m/s [65-80]
Inlet of steam coil 0.3-0.7 MPa 30 m/s [25-30]
Air
Higher pressure: 1.0 MPa or more 20 m/s [20-25]
Lower pressure 15 m/s [5-15]
Extremely low pressure: 0.1 MPa or less 10 m/s [3-10]
Water, Oil 2 m/s [2- 4]
* This table is based on the requirements provided in JIS F 7101 [Shipbuilding – Pipes
of machinery – Standard velocity of flow].

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EPDT-253b
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6
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Precautions for Operation
Caution
1. When installing, check the direction of the product.
* Setting the product in wrong directions hampers the product from performing as intended.
2. When installing, reserve a space required for maintenance and inspection (cleaning of the screen) so
that an operator can pick up the screen from the product.
(1) Clogging inside the product can be known from the differential pressure measured when
pressure gauges are installed in upstream and downstream of the product.
Warning
When the product is used for hot fluid, do not touch the product with bare hands.
* The product having hot fluid may scald your skin.
Caution
Use the product with a maximum pressure loss of 0.1 MPa or below.
Clean the screen periodically.
* Failure to follow this notice may damage the screen.
7. Precaution for Removal from Piping after Brushing
Warning
Before disassembling or inspecting, make sure that the internal pressure is
completely released from the product and the piping.
When the product is used for hot fluid, cool down the product to the condition that it
can be touched with bare hands.
*Residual pressure or hot fluid may result in scalds or injury.
8. Piping Example
Gasket
Temporary strainer Short pipe

PDD-046f
Warranty Information
1. Limited warranty
This product has been manufactured usin hi hly-advanced techniques and subjected to
strict quality control. Please be sure to use the product in accordance with instructions on
the manual and the label attached to it.
Yoshitake warrants the product to be free from any defects in material and workmanship
under normal usa e for a period of one year from the date of receipt by the ori inal user, but
no lon er than 24 months from the date of shipment from Yoshitake s factory.
2. Parts supply after product discontinuation
This product may be subject to discontinuation or chan e for improvement without any prior
notice. After the discontinuation of the product, Yoshitake supplies the repair parts for 5
years otherwise individually a reed.
3. This warranty does not cover the dama e due to any of below:
(1) Valve seat leaka e or malfunction caused by forei n substances inside pipin .
(2) Improper handlin or misuse.
(3) Improper supply conditions such as abnormal water pressure/quality.
(4) Water scale or freezin .
(5) Trouble with power/air supply.
(6) Any alteration made by other than Yoshitake.
(7) Use under severe conditions deviatin from the desi n specifications
e. . in case of corrosion due to outdoor use).
(8) Fire, flood, earthquake, thunder and other natural disasters.
(9) Consumable parts such as O-rin , asket, diaphra m and etc.
Yoshitake is not liable for any dama e or loss caused by malfunction or defect of the product.
This manual suits for next models
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Table of contents