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Smutsfilter/Strainers

Y-Strainers
Are devices for mechanically removing unwanted solids from liquid, gas or
steam lines by means of a perforated or wire mesh straining element.
They are used in pipelines to protect pumps, control valves, steam traps,
regulators and other process equipment.
Y-Strainers are very cost effective straining solutions in many applications.
Where the amount of material to be removed from the flow is relatively small,
resulting in long intervals between screen cleanings, the strainer screen is
manually cleaned by shutting down the line and removing the strainer cap.
For applications with heavier dirt loading, Y-Strainers can be fitted with a
"blow-off" connection that permits the screen to be cleaned without removing
it from the strainer body. hex.-nipple inserted in cover with ball valve.
Y-Strainers are used in a wide variety of liquid straining applications to protect
downstream process system components in many industries, including:
chemical processing, petroleum, power generation and marine.
Water handling applications, where Y-Strainers are used to protect equipment
that could be damaged or clogged by unwanted sand, gravel or other debris,
are very common.

Cast Steel
Available in sizes: 2” to 24” in ANSI Classes 150LB to 1500LB
End Connections: RF, RTJ or BW

Forged Steel
Available in sizes ¼” to 2” in ANSI Classes 150LB to 2500LB.
Ends Connections NPTF, SW, BW, RF and RTJ

Application
• Refineries, power stations, process and general industry
• For water, steam, gas, oil, and other media
• Other applications on request

Operating data
Pressure-temperature ratings STD to ASME B16.34
Pressure test STD to API 598 standard

Materials
Materials: WCB, LCC, CF3(M), CF8(M), CF8C, CN7M.
Screens: Stainless Steel almost all grades,, RPTFE, Nylon

Special materials also available:
Duplex, Super Duplex, Monel,
Hastelloy, Titanium, Inconel, Incoloy, 6MO

While often used in many different types of liquid applications, a Y-Strainer is
considered the standard for steam applications and is almost universally used
for these applications.
Its compact, cylindrical shape is very strong and can handle high pressures.
It is, literally, a pressure vessel.
Y-Strainers which handle pressures up to 6000 psi are not uncommon.
Of course, in these cases, the design of the strainer is critical so that it can
stand up to these high pressures without fear of failure.
When high pressure steam is being handled, another complicating
factor arises, temperature.
With steam pressures of 1500 psi or higher, standard carbon steel is
sometimes not suitable because the steam temperature may be 1000° F
or higher.
In these cases, the Y-Strainer body is generally made of chrome-moly steel.
Besides steam, Y-Strainers are often used in air and natural gas applications.
Here again, high pressures are not uncommon. However, unlike steam high
air pressure does not automatically mean high temperature and so,
ordinary carbon steel bodies of sufficient wall thickness will generally suffice.
Unlike other types of strainers, a Y-Strainer has the advantage of being able
to be installed in either a horizontal or vertical position.
Obviously, in both cases, the screening element must be on the "down side"
of the strainer body so that the entrapped material can properly collect in it.
Some manufactures reduce the size of the Y -Strainer body to save material
and cut cost.
Before installing a Y-Strainer, be sure it is large enough to properly handle
the flow. A low-priced strainer may be an indication of an undersized unit.

Carbon steel Y-Strainers are used mainly in the oil and petrochemical industry.
They have excellent resistance to mechanical or thermal shock and these are
important consideration in the event of a fire.
Most oil refineries will not permit iron piping components for this reason.
Carbon steel Y-Strainers are also used for higher pressure applications
because of their great strength.
Stainless steel Y-Strainers are used where high corrosion resistance or
where freedom from contamination is required.
They are popular in the chemical, food and pharmaceutical industries.

It cannot be stressed too highly that Y-Strainers for critical applications must
be adequately designed.
This means sufficiently heavy wall thickness and blow-off connections.
As an example, in improperly trapped steam lines, condensate can collect in
low points and become a slug of water traveling at very high velocity down
the line. Even the slight change in direction caused by a Y-Strainer can
produce a tremendous shock which can damage the strainer.
Manufacturers who thin down walls to save weight and cost are asking for
trouble in these cases.
A Y-Strainer, if fitted with a blow-off connections, can be a self-cleaning
strainer.
A valve is installed on the connection located on the strainer cap.
The screen can thus be cleaned by simply opening and then closing the
valve without shutting off the flow or disassembling the strainer.
When the valve is opened the material trapped inside the screen drains out.
Another critical thing to check for in Y-Strainers is the point where the screen
or straining element seals to the body.
This seat should be carefully machined so no particle can bypass it.
The same thing applies to the cleanout end. The screen should fit tightly.
Beware of strainers with un-machined seats.
The improperly seated screen will permit bypass of the fluid allowing dirt or
debris downstream.

Y-Strainers are available with a wide variety of end connections
including threaded, flanged and welded.
Flanges are designed to ANSI or EN/DIN specifications.
Special flanges such as ring joints are often available as well.
Y-Strainers can be constructed to US Navy flange dimensions, which are
different from commercial standards.
For extremely high pressure applications, Y-Strainers with socket or
butt weld end connections are often specified.

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