Rivr1059 HRT Flyer Tensioning System Catalog
User Manual: HRT-Tensioning-System-Catalog
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HRT TENSIONING SYSTEM
Recognizing the specific need for a
tensioning system designed for high
ambient temperature and minimum
envelope, Riverhawk offers the HRT
Tensioning System.
The Riverhawk HRT Tensioning System
is an enhancement of Riverhawk’s line
of standard hydraulic nuts and
tensioners which already offer the in-
dustry versatility, flexibility and
modular design. The most pronounced
attribute of the Riverhawk HRT sys-
tem is that it is directly retrofitable to
existing installation requirements. A
trait that is accomplished in a mini-
mum envelope.
No longer of concern are design-limit-
ing considerations such as tempera-
ture limiting seals and lubricants,
coatings, and coefficient of friction
due to torquing.
The concept of the HRT Tensioning
System was born of the need for a
tensioning solution that could be
readily retrofitted to existing studs
and suitable for high temperature ap-
plications. Further, a method of
tensioning was needed that did not
require special features on the stud
for gripping. Using the outside diam-
eter of the nut as a gripping surface
for tensioning satisfies this need.
High load capacity is achieved by vir-
tue of placing the hydraulic cylinder
above the stud and nut maximizing
the hydraulic working area for a given
cylinder outside diameter.
With the Riverhawk HRT Tensioning
System, studs can be accurately
tensioned to the required load. Any
number can be linked together to si-
multaneously provide a smooth uni-
Key advantages of the HRT:
• High Load Capacity
• Easily Retrofitable
• Stud Extension Not Required
• High Temperature Capability
• Hydraulics Separate From Nut
• Fully Simultaneous Tensioning
Capability
• Minimum Footprint Required
form load on the flange connection.
Fast, easy installation is assured.
PATENT PENDING
OPERATIONAL OVERVIEW
215 Clinton Road, New Hartford, NY 13413
Phone: 315-768-4855 Fax: 315-768-4941
sales@riverhawk.com http://www.riverhawk.com
Riverhawk Company, an engineering driven manufacturer, specializes in
hydraulic mechanical technologies. We meet the daily challenges of the
rotating equipment industry by offering auxiliary equipment such as air
driven and manual hydraulic pressure kits and pusher piston cylinders for
the installation of coupling hubs, thrust discs, and compressor wheels.
Riverhawk also designs and manufactures hydraulically tensioned studs
and nuts, tensioning tools, hydraulic nuts, and plug and ring gages. We
also provide source inspections and training seminars. Our equipment is
proudly supplied to the top OEMs and end users of the turbomachinery
industry. Riverhawk is a member of the American Petroleum Institute
(API) and sits on the coupling committee of the American Gear Manufac-
turers Association (AGMA).
For more information about Riverhawk’s
HRT Tensioning System or any of our other
products and services call:
Release date - 02/02 (1059)
In operation, hydraulic pressure is in-
troduced via a port in the cylinder.
The reactive force thus generated is
transmitted through the cylinder and,
in turn, through the nut to pull on
the stud. In this system, a circle of
axial ports pass through the nut. Con-
tained within these ports is a series of
rods which transmit force from the
bottom of the piston through a com-
mon washer to the flange face. When
the stud is tensioned to a predeter-
mined shank stress, a retaining ring
threaded on the outside diameter of
the nut, is spun down into contact
with the flange. The retaining ring
serves to maintain the separating
force between the nut and the flange.
The load cell portion of the system in-
cluding the tensioner piston,
tensioner cylinder and rods is removed
after tensioning is complete. This
eliminates temperature limitations
that seal materials and oil would im-
pose if they were to remain in the as-
sembly during service as is the case in
other hydraulic nut configurations.
NUT
CYLINDER
RETAINING RING
WASHER STUD
FLANGE
ROD
ROD PLATFORM
PISTON
HYDRAULIC
PORT
