How to Start preparing for and Finalize a Hydrostatic Test

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How to Start preparing for and Finalize a
Hydrostatic Test
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Hydrostatic (Hydro) testing is a process that
evaluates the strength and leakage of components
such as piping systems, gas cylinders, boilers,
and pressure vessels. Hydrostatic tests are
frequently required following shutdowns and
repairs to ensure that the equipment will operate
under the desired conditions when it is returned
to service.Furthermore, hydrostatic testing
cannot be performed during normal operations and
cannot detect leaks in equipment after the test
has been completed. An effective fixed equipment
mechanical integrity programmed is the best way
to manage on-stream equipment integrity.Although
 Hydrotesting is considered nondestructive,
equipment can rupture and fail if the inspection
exceeds a specified test pressure or a small
crack propagates quickly.
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What Is the Process of Hydrotesting?

• Hydrostatic testing is a type of pressure test
  that involves completely filling the component
  with water, removing the air within the unit, and
  pressurizing the system up to 1.5 times the
  unit's design pressure limit. The pressure is
  then maintained for a set period of time in order
  to visually inspect the system for leaks. Visual
  inspection can be improved by adding tracer or
  fluorescent dyes to the liquid to pinpoint the
  location of cracks and leaks.

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Common Hydrostatic Testing Methods

• To test small pressure vessels and cylinders,
  three common hydrostatic testing techniques are
  used
• The water jacket method,
• The direct expansion method,
• And the proof pressure testing method.

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Water Jacket Technique

• To perform this method, the vessel is filled with
  water and loaded into a sealed chamber (referred
  to as the test jacket) that is also filled with
  water. After that, the vessel is pressurized
  inside the test jacket for a set period of time.
  This causes the vessel within the test jacket to
  expand, causing water to be forced out into a
  glass tube that measures total expansion. After
  recording the total expansion, the vessel is
  depressurized and shrinks to its original size.
  Water flows back into the test jacket as the
  vessel deflates.
• The vessel does not always return to its original
  size. Permanent expansion refers to the second
  size value. The difference between total and
  permanent expansion determines whether or not the
  vessel is serviceable. The higher the percentage
  expansion, the more likely it is that the vessel
  will be decommissioned.

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Method of Direct Expansion

• Filling a vessel or cylinder with a specific
  amount of water, pressurizing the system, and
  measuring the amount of water expelled once the
  pressure is released is the direct expansion
  method. The permanent and total expansion values
  are calculated by keeping track of the amount of
  water forced into the vessel, the test pressure,
  and the amount of water expelled from the vessel.

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Method of Proof Pressure

• The proof pressure test uses an internal pressure
  to determine whether the vessel has any leaks or
  other weaknesses, such as wall thinning, that
  could lead to failure. In the United States, this
  method is only permitted when the US Code of
  Federal Regulations does not require the
  recording of permanent and total expansion
  values.

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Alternative Techniques

• Some equipment may be incapable of handling the
  loads required for a pressure test. Alternative
  methods, such as pneumatic testing, should be
  used in these cases. Another type of pressure
  test is pneumatic testing, which involves
  pressurizing the vessel with a gas other than
  water, such as air or nitrogen. However, when
  performing pneumatic testing, special care should
  be taken because gaseous mediums can be
  compressed and contained in greater quantities
  than hydrostatic testing.

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Read Morehttps//www.articleted.com/article/5906
48/165446/How-to-Start-preparing-for-and-Finalize-
a-Hydrostatic-Test

Cortec also provides mothballing to water
treatment plants.
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Contact Details

Cortec Middle East
Sidra Tower, Office 1307 Sheikh Zayed Road P.O.
Box 115133 Dubai, United Arab Emirates

Tel [phone]
Fax [phone]
Email inquiries_at_cortec-me.com
Website https//cortec-me.com/
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