Metal Safety Shields
uses 24 gauge steel exclusively for its metal safety shields. This
gauge, approximately 25 thousandth of an inch thick, is ideal for
safety shields. It
is sufficiently heavy to withstand high
pressures and also has flexibility to permit shaping.
has developed specialized equipment for production of its shields,
use of its manufacturing methods results in high volume production
at relatively low cost.
are used for RAMCO® Safety Shields:
steel is installed widely for water, oil and steam applications.
The galvanized material is steel that has been coated with zinc
to reduce rusting. It is vulnerable to corrosive attack and should
not be used on lines carrying hazardous chemicals. When installed
on vessels, it is mandatory that the shield be equipped with a special
inner galvanized mesh lining that breaks up the impact of a jet
spray on the shield surface, eliminating up to 90% of lateral aerosol
uses stainless steel “304” and “316” alloys
specially developed for corrosive applications. Stainless steel
“304” contains 18-20% chromium and 8-10.5% nickel and
is suitable for applications requiring mild corrosion resistance.
In contrast, stainless steel “316” contains 16-18% chromium
10-14% nickel as well as 2-3% molybdenum. The latter component gives
superior resistance to pitting and to most types of corrosion, making
“316” suitable for applications involving severe corrosive
conditions. These safety shields are also available with inner stainless
Since the heat
limit for a thermoplastic shield is approximately 450°F (232°C),
the use of stainless steel safety shields is required whenever conditions
in the line exceed this temperature.
The choice between “304” and “316” depends
on which is likely to suffer the least corrosive attack. Stainless
steel with a thickness of 24 gauge has a tensile strength of 3000
psi (207 bar), and a melting point of approximately 2650°F (1454°C).
Although some pitting may occur due to corrosive fumes, stainless
steel safety shields can be expected to provide many years of effective
service. They have been approved by the United States Department
of Agriculture for installation in food processing plants.
circumstances, it has been observed that chemicals may be present
in the external environment that are incompatible with RAMCO®
thermoplastic safety shields. This unfavorable, aggressive climate
causes shield damage. With these conditions, installation of stainless
steel safety shields is recommended, even though the line temperature
may be less than 450°F (232°C).
RAMCO® Metal Safety Shields are suitable for flanges and every
type of valve in all size systems carrying steam, solvents, chemicals
and corrosive agents. They are appropriate for all high pressure
and temperature applications. The shields slip over existing pipe
installations and are put in place easily and quickly with the use
of a screwdriver.
In the event
of a leak, the fluid collects at the bottom of the shield where
the overlapping slotted edge prevents a lateral blowout and allows
the leaking condition to be highly visible without causing injury
to plant personnel and equipment.