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YOKE TYPE CLOSURE
EFFICIENCY AND ECONOMY
Q.B. Johnson Manufacturing Yoke Type
Closures afford efficiency and economy for applications where frequent
access is required or use of blind flanges is cumbersome and time
consuming.
APPLICATIONS
We build closures that are used in many applications.
| Gas |
Blowdowns |
| Oil and
Products Pipelines |
Meter Provers |
| Pig Launchers
and Receivers |
Storage Tanks |
| Filters |
Vacuum
Service Equipment |
| Filter
Separators |
Railway Tank
Carss |
| Strainers |
Barges and
Ships |
| Mixing and
Cooking Vessels |
Research and
Development Vessels |
| Batch
Sweetening Vessels |
Test Chamber |
Our closures are compact in size
and functional in design. The standard unit consists of a forged hub, a hinged
blanking head, split-yoke clamps, operating bolts and a self-energizing O-ring
gasket. Materials of construction are in accord with ASME specifications and
manufacturing complies with applicable rules of the ANSI Code for Pressure
Piping and with ASME Boiler and Pressure Vessel Code.
FAST EASY OPERATION
Our closures provide fast and easy operation. Application is smooth and
direct. Even the largest unit can be opened in minutes by one man with standard
wrenches. Hammering lug flanges, heavy metals doors or threaded closures is not
necessary with our closures.
AVAILABILITY
Q.B. Johnson Manufacturing has a great variety of closures. Our closures
are available horizontal or vertical in standard design sizes of 6-60”
in carbon steel, in 150, 300 and 600 pound pressure classes. Other
alloys and pressures classes can be produced on special orders.
Our working pressures are
established by ANSI B16.5 ratings. The standard maximum service
temperature for carbon steel 150, 300 and 600 pound closures is 250˚F.
Higher temperatures are available on special order.
Hinged closures can be
made from types 304, 304L, 316, 316L and 347 stainless steel. Closures
can be made available ASME CODE STAMPED with a Partial Data Report at a
nominal extra cost.
We also have a variety of
operating aid devices to simplify the opening and closing our closures
that will enhance the efficient design.
MINIMUM MAINTENANCE
Q.B. Johnson Manufacturing provides an easy installation and minimum
maintenance with our closures.
Our closures are easy to
install. A single circumferential butt weld joining the closure hub to
the vessel or pipe installs the closure.
Our standard gasket is an oil-resistant O-ring that in stationary when
opening and closing the head. There is no rubbing or chafing, as with
threaded closures, that causes wear and shortened seal life.
OPTIONAL MATERIALS
Our closures are suitable for specialty linings or prepared for coating
and plating with epoxies, chromium, nickel and cadmium are available on
special order.
Standard construction material is carbon steel made to ASME
Specifications, SA105 or SA105 and SA516 Gr. 70 for the head, SA105 for
forged yokes, SA193 Gr. B7 for yoke bolts and SA516-70 for structural
components. An O-ring of “Buna-N” is furnished unless other material is
specified.
PRESSURE WARNING DEVICE
The Pressure Warning device with yoke positioning plate provides visual
and mechanical assurance that the yokes are correctly in alignment with
the hub prior to pressurization. Additionally, the pressure warning
device alerts the operator to any residual pressure in the vessel if he
tries to open the closure before the pressure has been relieved.
The device is located at the split yoke opposite of the leveling hinge.
Tightening the holding screw on the
nipple provides a seal and locks the hinged positioning plate on the
positioning lug.
Loosening the screw breaks the seal and provides a mean by which the
operator can determine whether the pressure has been completely relieved
internally. Continuing to loosen the holding screw will allow the
disengagement of the positioning plate from the positioning lug,
permitting the yoke halves to be spread and the closure to be opened. |
