Page 138 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

SOLID-LIQUID SEPARATION AND INTERCEPTORS

3.6 CHAPTER THREE

TABLE 3.2 Relationship Between Mesh and Opening Size

Mesh size Particle diameter, μm
Strainer
4 5,205
8 2,487
10 1,923
14 1,307
18 1,000
20 840
25 710
30 590
35 500
40 420
45 350
50 297
60 250
70 210
80 177
100 149
120 125
140 105
170 88
200 74
230 62
270 53
Filter

325 44
400 37
550 25
800 15
1,250 10

TYPES OF STRAINERS

Types of strainers include Y and basket (or bucket) types. Basket strainers are available in
self-cleaning models. All types are available with a large variety of jointing methods for
insertion into a pipeline, including soldered types available for copper piping. They are
available as off-the-shelf models capable of meeting any reasonable need. Manufacturers
can construct units for special conditions.
The Y-type strainer, illustrated in Fig. 3.1, is compact in design and is considered for use
where space is at a premium. Frequent cleaning is often required. Its construction makes it
a good choice for high pressure applications and for gases such as steam, natural gas, and
compressed air where pressures are higher and amount of dirt present is low. It has a smaller
dirt-holding capacity than similar sizes of basket strainers. It is installed in a pipeline with
its strainer element in the down position, and can be positioned either horizontally or verti-
cally. Very often, a valved pipe will be put in the removable end of the strainer so that the
accumulated debris can be easily blown out while keeping the line in service.
The basket strainer, illustrated in Fig. 3.2, gets its name from the upright, perforated
basket used to trap particles. It is installed upright in the strainer body, and the top of the

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