Introduction: Fluid controls Double Ferrule compression Tube Fittings provide leak proof torque free seals at all tubing connections. They eliminate hazardous leaks in instrumentation, process, pneumatic, hydraulic, gas and other applicable tubing system which could other wise turn out to be costly to the installation.

The two ferrules grasp tightly around the tube with no damage to the tube wall. Exhaustive test shave proven that the tubing will yield before a Fluid control Double Ferrule joint starts leaking.

The secret behind the success of the Fluid Control Double Ferrule Fittings lies in the two ferrule design which is a combination of geometry and metallurgy. All the action in the fitting is by an axial movements along the tube instead of a rotary to create the joint. This axial movements prevents any torque to be transmitted from a fitting to the tubing since there is no initial strain in the tubing, the making of the joint does not weaken the tubing.

Another advantage of the Fluid Control Double Ferrule Fittings is that the sequential action of the twin ferrule overcomes variations in the wall thickness, hardness and dimensional tolerance of the tubes.This way proper ferrule interaction compensates for most of the variables which lead to failure in the other fittings.

Fluid Control Double Ferrule Fittings are easy to install and require no special tools in process.They are reusable several times and can withstand  heavy impulse and vibration both in vacuum and pressure systems. Absence of damage to the tube surface prevents fatigue failure

Double Ferrule Fittings : Design Advantages

• Self-aligning
• Works on thick and thin wall tubing
• Vibration resistant
• Compatible with a variety of tube ends
• All components made of the same material resulting in thermal compatibility and corrosion resistance
• Resistant to temperature cycling
• Compensates for variables encountered in tube material
• Does not significantly reduce the flow area

Double Ferrule Fittings : Performance Advantages

• Works for vacuum as well as high / low pressures
• Seals at low cryogenic temperatures as well as high temperatures rated for the tube
• Seals consistently over a wide range of temperature cycling
• Seals repeatedly under make-and-break conditions
• Resistant to pressure up to the burst point within the tubing without leakage

Double Ferrule Fittings : Performance Specifications

There are no standards for performance of Double Ferrule Fittings. The working pressure of the fitting is restricted to the maximum working pressure of the tubes. Consequently, the working pressure of the tubing prevails as the working pressure for these fittings.The maximum working pressure of the fitting is also restricted by the pressure rating for the pipe end connections. The lower of the two will be the maximum working pressure for the fittings.Although there are no standard specifications available for type test requirements for Double

Ferrule Fittings, some of the tests to which can be used are :

• Proof Pressure Test
• Dismantling and Reassembly Test
• Minimum Hydraulic Burst Pressure Test
• Minimum Static Vacuum Test
• Hydraulic Impulse Vibration Test

Fluid Controls offers a wide range of Valves for low, medium and high pressure usage. These Valves are used for instrumentation in the chemical, petrochemical and oil/gas industries. They are also used for high pressure hydraulics, pneumatics and lubrication.

Manufacture: Manufactured at our facility in Lonavla in Western India, our Valves designs are first tested and tried before they go in for general manufacture. The products are also machined for tolerance and compliance with International Standards.

Quality Control: Fluid Controls has a fully-fledged Quality Control department which is equipped with all required gauges and test equipment. We are also backed by the support of nationally accredited laboratories for any special tests which may need to be conducted. For each of our valves, we have developed a separate Quality Assurance Program which is submitted to clients who place large orders.

Certification: All Valves supplied by Fluid Controls are accompanied with an ISO 3.1 .b certificate for material and for performance to regular and type tests specified by our clients Feature:

 

• Needle valves
• Ball valves
  
• Check valves
  
• OS and Y Bolted Bonnet Valves
• Pressure gauge pin valves
  
• Ultra-High Pressure Pnneumatic Valves
• Oil Hydraulic Pressure Gauge Isolator

Fluid Controls offers a series of compact Manifolds for use with pressure and differential pressure instruments. Manifolds offer users several advantages. Firstly, they eliminate several parts used in conventional piping methods (such as valves and adaptors) and consequently result in cost savings. Secondly, their compact design also reduces space requirements for operation and installation. Thirdly, the internal porting arrangement within the Manifolds also eliminates leakage points.

Manifolds : 2, 3, 5 valve construction

TWO VALVE MANIFOLDS are used in pressure instruments such as pressure gauges, pressure transmitters, pressure switches, etc.

THREE VALVE and FIVE VALVE MANIFOLDS are used in differential pressure instruments such as differential pressure transmitters, differential pressure switches, differential pressure gauges, etc.

THREE VALVE MANIFOLDS are the most commonly used Manifolds. They could be provided with test ports on the process side and drain ports on the instrument side for drawing of the process and instrument lines respectively.

FIVE VALVE MANIFOLDS are normally used with differential pressure instruments where drain valves are required on the instrument side. They are also used for flushing of the system and for the prevention of loss of expensive fluid in the impulses.

Options for Mounting

• Seperately Mounted Manifold
• Direct Mounting "T" Type Manifold
• Direct Mounting "H" Type Manifold
• Co-Planar Manifold

Uniqueness of Fluid Controls Manifolds : Pressure Sealing System

At the heart of the Fluid Controls Manifold is the design of the pressure sealing system for ' each of the valves. Specifically :

 

• The stem threads are rolled to reduce friction
• The stem threads are coated with a silver Teflon mixture to allow for smooth operation
• The stem plug has a swiveling design and is uniquely hardened to provide for wear and a long life
• The stem assembly is designed to prevent blowouts under excessive pressure
• The stem threads are not wetted therefore preventing any possibility of condensation or jamming

Manifolds : Design Features

The standard Fluid Controls manifold design has a case hardened swiveling stem plug. This is suitable for mot applications in low, medium and high pressures. Where gas at high pressure is encountered, Fluid Controls offers a swiveling plug with a soft seat design. The seat materials are reinforced PTFE, Delrin and PEEK.

The design of the manifold has a case hardened ball plug in SS316. Manifolds made of Hastealloy C, monel, inconel and titanium have tungsten carbide ball plugs

Fluid Controls manifolds are designed with the "thread above the seal" so that the stem threads are not wetted by the fluid flowing in the system

The gland sealing arrangements vary based on temperature requirements. For temperatures upto 180dC, the material used is RPTFE. For temperatures in the 180dC to 270dC range, graphitized asbestos is used. Beyond 270dC and upto 540dC, graphoil seals are used

Manifolds : Material

Fluid Controls Manifolds are available in a variety of materials, depending upon the usage. The choice of materials is based on the working fluid and the installation location, where atmospheric conditions may vary and require specific materials to prevent corrosion and withstand vibration.

Fluid Controls offers a range of pipe clamps manufactured by it's sister concern Hyd-Air Engineering Works, Goa. Clamping of pipes in installations is required to dampen vibrations, provide support to the installation and prevent loosening of the joints/welds.

Hyd-Air Pipe Clamps, with their unique 4-rib construction design, prevent the transmission of vibrations from the pipe to the frame and vice-versa. They also provide rigid support to the pipe, both in lateral and longitudinal directions, relieving stresses caused by unequal movements in the pipeline. The material of the pipe clamps differs to suit working conditions - from relatively cold conditions to temperatures upto 550⁰C. Hyd-Air Pipe Clamps conform to DIN 3015: 2000

Heavy Duty Pipe Clamps:

Heavy Duty Pipe Clamps are used in installations where heavy pipes and high vibrations are encountered. They are invariably used for trench layout of pipes and in open-weather conditions.

Heavy Duty Pipe Clamps are available with weld plate mounting for all sizes and for channel mounting with special "T" nuts for pipe sizes upto 1" or 38mm OD. Channels are available in lengths of 1/2" meter and are economical for multiple mounting on a single channel. Both the weld plate and the channel mounting designs are available only with a top plate in view of the heavy vibration and loading encountered.

Heavy Duty Pipe Clamps with polypropylene bodies are available for pipe sizes upto 8" or 222 mm OD. They are available in a vertical mounting arrangement or a horizontal multi-clamp arrangement wither back to back or run.

Standard Duty Pipe Clamps:

Standard Duty Pipe Clamps are used in installations having average loading with relatively light vibration in the system. These clamps are ideal for machine tool applications and in instrumentation piping. The clamps may be used without the top plate for reasons of economy where there is low/no vibration.

Standard Duty Pipe Clamps are also available for channel mounting with special "T" nuts. Channels are available in lengths of V% meter and are useful for multiple clamping on a single base. They also allow flexibility of clamping where the pitch between the pipes is uneven. Standard Duty Pipe Clamps are available for pipe sizes upto 2" or 50mm OD.

Fluid Controls offers a range of flanges manufactured by it's sister concern Hyd-Air Engineering Works, Goa.

The use of weld nipple and ferrule type of fittings is widespread for tube sizes upto 38mm OD. For bigger sizes, ferrule and weld nipple type of fittings are impracticable because of their heavy hexagonal sections which increase the pitch between pipes and because of the high torques required for tightening them.

Flanges with Butt Weld or Socket Weld ends offer a practical solution to these shortcomings, leading to compact piping installations.

CETOP FLANGES:

CETOP PR 63H, AFNOR 48-0-54 and ISO 6164 specify flanges with Butt Weld ends and square clamping flanges for 250 bar and 400 bar static working pressures. These correspond to 160 bar and 315 bar dynamic working pressures respectively. The flange system consists of one or two sleeves to be butt or socket welded to the pipe and clamped together between two square flanges by a set of four hex bolts, nuts and spring washers. One of the sleeves carries an "O" ring groove fitted with an "O" ring for sealing the interface.

SAE FLANGES:

The use of these ISO 6164 flanges has one disadvantage. The size of the square flange requires a higher pitch between pipes due to the flange size. In order to reduce the distance between pipes, SAE introduced their own standards, which are now incorporated into ISO 6162 for 3000 psi and 6000 psi static pressure ranges. The SAE system depends on the same set of butt welding sleeves, held together by a set consisting of a split flange and a solid flange, secured by hex bolts and nuts.

The design for SAE flanges calls for forged flanges to ASTM A105 with sleeves made from weldable material. In order to reduce costs, various manufacturers have introduced a two piece system where the sleeve and the flange are combined into one piece. Such a system is easily adaptable to both the Butt Weld and Socket Weld systems.

Material

With the introduction of more corrosive fluids in piping systems, the total joint is not required to be of non-corrosive material (such as SS). Only the sleeves, which are wetted by the fluid, are required to be of SS. This makes for an economical joint.

Further, the orientation of these flange joints can be done in such a way so as minimize the distance between the pipes and provide for a compact installation.