Company Introduction

Founded in 1947, Resitoflex has been a pioneer of several world class technologies and introduced the same in India in the following Chronologicalmanner:
  • 1947 - Vibration, Shock and Noise Control comprising of Isolators and Flexible Joints.
  • 1992 - Spring Mounts and Viscous Dampers in collaboration with Christie & Grey, U.K. along with advanced computer programs for optimized selection.
  • 1997 - Air Suspension Systems in collaboration with Contitech, Germany.
  • 2012 - Seismic Base Isolation of Buildings developed in technical co-operation with Department of Earthquake Engineering, IIT Roorkee.
  • 2014 - Seismic Restraint Systems. Special computer programs developed by Department of Earthquake Engineering, Roorkee are used in-house for response analysis and optimization of restraining devices.

Seismic Restraint Systems

When it comes to earthquake preparedness, the devil is in the details. Seismic experts say most of the damage from earthquakes is caused not by crumbling walls or collapsing roofs but failures in the less visible, often overlooked, parts of a building—especially pressure piping and other components which if not properly detailed, they risk potentially devastating financial effects from property loss or system shut-downs.”

RESISTOFLEX offers three types of Restraint Systems
  • Sway Braces - for Suspended Equipment, Electrical Conduits, Piping, and Duct Work.
  • Pipe Risers - using Anchors, Guides, and Isolators.
  • Snubbers - for Floor Mounted Equipments.
  • 2014 - Seismic Restraint Systems. Special computer programs developed by the Department of Earthquake Engineering, Roorkee are used in-house for response analysis and optimization of restraining devices.

Seismic Sway Braces

Sway braces are the most important efficient means of keeping suspended equipment, electrical conduits, piping, and duct work in place and to keep them from swaying during earthquakes or bomb blasts. Seismic braces can be flexible using aircraft quality cables, or rigid (solid) using steel sections such as pipe, angles, or strut channels. Braces are typically installed 10-13 m apart, at system turns and at the end of runs. Braces are attached to the pipe/duct at horizontal supports such as clevis's or trapezes. The other end is attached to structure such as overhead concrete slabs or structural steel. Suspended equipment requires a minimum of four braces, one at each corner.

Pressure Piping Systems

Pressure piping systems carry a wide range of fluids and gases around buildings, generally at pressures greater than 1 bar. Systems are usually configured in some combination of horizontal and vertical runs of pipe suspended overhead or mounted on (and penetrating through) walls, floors or roofs.

Seismic Risks

Flexible connections are often required at fixed equipment or where piping crosses an expansion joint or seismic separation.Virtually all of these traits comewith their own seismic risks.

Improperly supported or unbraced piping can fall or sway into adjacent equipment or structures. Joints, connections to equipment, bends, and penetrations are often the source of breaks and leakage, damaging both the piping system and adjacent equipments.

Another common cause of damage, especially in large industrial complexes, is differential movement between points of attachment. Often, pipelines will span two or more connected buildings that may react differently in a quake. Seismic restraints at the interface of the two buildings should take into account the structural aspects of each building.

Longitudinal Bracing

Longitudinal pipe bracing requires the use of a pipe clamp, riser clamp, welded lug, or other hardware that positively attaches to the pipe to prevent slippage. Friction connections such as U-bolts are no-no's for longitudinal restraint because they are highly prone to slips

APPLICATIONS

Mechanical Systems
  • Piping
  • Ductwork
  • Suspended Equipment
Electrical Systems
  • Cable Trays
  • Bus Ducts
  • Conduit
Plumbing Systems
  • Piping
Fire Protection Systems
  • Piping

Pipe, Cable Trays, Bus Ducts & Conduit Bracing Details

Cable Bracing

Rigid Or Solid Bracing

Duct Bracing Details

Cable Bracing

Rigid or Solid Bracing

Suspended Equipment Bracing

Pipe Risers

Anchors (PRA) / Guides PRG

Pipe riser for pressure piping are vertical runs of pressurized piping such as those used in multistory building. Risers are typically supported by a combination of wallmounted supports and additional floor-mounted or roof-mounted supports at the locations of penetrations. Seismic restraints have to designed to accommodate the anticipated inter story drift and the thermalmovement.

Resistoflex Pipe risers are designed to accommodate inter-story drift between adjacent floors, that is, different floors of the building. During an earthquake the supports to fail or the pipe joints to fail and leak , pipe to be dislodged and fall and unbraced riser ti sway and impact adjacent items.

CAUTION - Pipe are vulnerable at penetrations thus floor and roof penetrations are sufficiently oversized to prevent impact. Unrestrained movement of pipes at penetrations may damage the piping and pipe restraints but may also damage flooring, ceiling, partitions, insulation, fire-proofing or other architectural finishes. For insulated risers, the piping insulationmay also be damaged if the pipe chafes at the restraint. If risers are mounted to lightweight partitions, the partitions may be damaged unless they have been designed and braced to resist the piping loads.

Features

Isolated pipe riser anchor incorporating single/multiple spring or rubber material are strategically placed to support the riser and allow expansion & contraction with small and easily calculable load changes. The Spring support systems can be designed to utilize a central isolated anchor which remains neutral during operation, or a totally free-floating system with spring support only. If a single anchor is used, it is located as close as possible to the middle of the riser to direct the pipe to expand away or contract towards the anchor point. By locating the anchor in the center of the riser the expansion and contraction at each end is cut in half. The anchor is designed to withstand the "worst case" forces generated when the water weight is removed for maintenance of equipment without the need to access and re-adjust the mountings. As the number and location of isolators may vary from one set on every floor for maximum load distribution or they may be spaced at greater intervals. Isolated pipe guides should be used in most systems to maintain alignment of anchored or unanchored spring support systems. Risers can be butt welded when installed to assure integrity. They are easy to install and require no maintenance.

Design Condition:

Anchors and Guides are designed to eliminate or limit pipe movement and must be rigidly attached to the structure for effective isolation. Anchors & guides are remote from the piping itself as it is used under the ends of riser clamp and guide ring. Anchors and Guides are manufactured for all pipe sizes.

Pipe Anchor & Guide

An all directional Anchor for providing high frequency noise and vibration isolation for all locations where movement of pipe is to be restrained.

Acoustical Neoprene Rubber element is sandwiched between concentric inner steel sleeve with heavy square flange (with or without tapped hole) and outer steel sleeve with channel shaped base which can either be welded to an additional base-plate or welded directly to structural supporting member.

Anchors are always used in pairs.

Note: Base Plate is optional

S.No. Item Material
1 Connection Bolt Steel
2 Lower Housing Steel
3 Resilient Element Rubber
4 Upper Housing Steel

Mode Of Installation

Seismic Snubbers

For Floor Supported Equipments

Earthquake is not just a single jolt but an input of random frequencies at different accelerating levels

Mounted equipments can be completely damaged or even fly – off if not fully protected against earthquake

All directional Seismic Snubber will provide safety in vertical, two horizontal modes as well as in the three rocking modes

Snubbers will also take care of errors in alignment and / orminor shifting

Applications:

Air Handling Units, Air Conditioners, Blowers, Bases, Condensers, Chillers, Cooling Towers, Compressors, Fans, Fan Coil Units, Motors, Packaged Units, Piping, D.G. Sets & other essential service equipments installed on Vibration Isolators inAuditoriums, Buildings,Hotels, Hospital, etc.

Ssz All - Directional Seismic Snubber

Style SSZ Snubbers are all directional double acting type with interlocking steel members restrained by Neoprene Shock Absorbing Element having physical and non-ageing properties to match the life of the installations. They are structurally very sound.

All contact surfaces are resilient with non-linear stiffness characteristics & are sufficiently thick to allow adequate time for deceleration down to desirable levels.

A special feature of Style SSZ snubber is removable resilient element for checking, if physically damaged accidentally.

Dimension & Selection Guide By Loads

CODE CAPACITY (Kgf) DIMENSIONS (mm) RECOMMENDED ANCHOR BOLT 'EAB' (BY OTHERS) ≥Gr. 8.8
A B C D E F T
SSZ2-00220 220 190 158 90 13 76 - 6 M10
SSZ2-00550 550 210 172 150 15 110 - 10 M12
SSZ4-02200 2200 320 254 180 19 127 128 12 M16
SSZ4-05500 5500 370 304 200 27 146 140 20 M24
SSZ4-11000 11000 405 324 280 36 203 210 25 M33
India's first Seismic Base Isolated Commercial Building
Quasi Static Through Zero Testing
Injection Rubber Moulding
Dynamic Testing With Servo Pulser & Climatic Chamber