Rivr1059 HRT Flyer Tensioning System Catalog

User Manual: HRT-Tensioning-System-Catalog

Open the PDF directly: View PDF .
Page Count: 2

Download
Open PDF In Browser	View PDF

HRT TENSIONING SYSTEM

PATENT PENDING

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 industry versatility, flexibility and
modular design. The most pronounced
attribute of the Riverhawk HRT system is that it is directly retrofitable to
existing installation requirements. A
trait that is accomplished in a minimum envelope.
No longer of concern are design-limiting considerations such as temperature 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 applications. Further, a method of
tensioning was needed that did not
require special features on the stud
for gripping. Using the outside diameter of the nut as a gripping surface
for tensioning satisfies this need.
High load capacity is achieved by virtue 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 simultaneously provide a smooth uni-

form load on the flange connection.
Fast, easy installation is assured.

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

OPERATIONAL OVERVIEW
In operation, hydraulic pressure is introduced 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. Contained within these ports is a series of
rods which transmit force from the

bottom of the piston through a common washer to the flange face. When
the stud is tensioned to a predetermined 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 including the tensioner piston,
tensioner cylinder and rods is removed
after tensioning is complete. This
eliminates temperature limitations
that seal materials and oil would impose if they were to remain in the assembly during service as is the case in
other hydraulic nut configurations.

FLANGE

NUT
ROD
ROD PLATFORM
PISTON

WASHER

STUD

RETAINING RING
CYLINDER

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 Manufacturers Association (AGMA).

HYDRAULIC
PORT

For more information about Riverhawk’s
HRT Tensioning System or any of our other
products and services call:

215 Clinton Road, New Hartford, NY 13413
Phone: 315-768-4855 Fax: 315-768-4941
sales@riverhawk.com http://www.riverhawk.com
Release date - 02/02 (1059)



---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 2002:02:13 10:12:45-05:00
Modify Date                     : 2002:11:26 08:55:18-08:00
Page Count                      : 2
Creation Date                   : 2002:02:13 15:12:45Z
Mod Date                        : 2002:02:13 15:12:45Z
Producer                        : Acrobat Distiller 5.0.2 for Macintosh
Author                          : E-Boy
Metadata Date                   : 2002:02:13 15:12:45Z
Creator                         : E-Boy
Title                           : rivr1059 HRT Flyer

EXIF Metadata provided by EXIF.tools