Features

• Unique pivot body design
• Stainless steel construction
• Sealed pipe connections
• Shorter length syphon pipe

Benefits

• Longer operating life
• Corrosion resistant materials
• Eliminates leakage, reduced dryer flooding
• Reduced load on rotary joint supports

The Kadant Johnson Pivot Body syphon elbow design consists of three major parts: horizontal body, pivot body, and standard EPR O-ring. Both body components are made of stainless steel. There are three sizes available:

Note that the horizontal pipe and vertical pipe are not the same size. The vertical pipe is one pipe size smaller. The smaller vertical leg limits blow-through steam and reduces the cantilevered weight of the syphon assembly. In turn, this reduces the stress on the pipe threads securing the horizontal pipe into the head of the rotary joint.

The Kadant Johnson locking elbow is the first 45° syphon elbow designed exclusively for high speed, small roll diameter applications. The stainless steel horizontal leg is secured to the vertical leg using a proprietary locking mechanism. This robust syphon elbow provides maximum reliability and performance.

As an integral component of the steam joint, the locking elbow is the most maintenance-free and reliable syphon elbow available.

Features of the 45° Locking Elbow

• Patented pinless design
• Increased robustness of syphon system
• Materials are made of stainless steel for corrosion resistance.
• Straight thread on vertical leg allows for syphon clearance adjustment.

For easy installation, Kadant Johnson has engineered an installation tool that locks the elbow in position once inside the roll. To permit easy removal of the elbow, special alloys have been used to minimize galling and corrosion.

To use the locking elbow with Kadant Johnson rotary joints Type SX, ELS and LJ-PT, a -1 head with a pressure plate and split ring and a 1″ schedule 80 horizontal pipe is recommended. As an alternative, Kadant Johnson offers its CorrPro steam joint and syphon as a complete package for the ultimate rotary joint and syphon for small roll, high speed applications.

Spring-Lock Syphon Elbow

Increase the life of an existing Kadant Johnson syphon elbow by upgrading to the spring-lock syphon elbow. This simple, inexpensive upgrade installs quickly and easily using your existing joint and syphon pipes. The corrosion-resistant materials and increased robustness of the syphon elbow assembly improves syphon performance and reduces maintenance downtime.

The spring-lock elbows are available off-the-shelf for immediate delivery.

Spring-Lock Design

Kadant Johnson spring-locking elbows consist of the standard gravity-lock elbow and a spring-lock assembly. The spring-lock assembly consists of five parts:
(2) Pipe collars, stainless steel (identical parts)
(2) Collar straps (identical parts)
(1) Locking spring, stainless steel

Features of the Kadant Johnson spring-lock system:

• The collars and spring are stainless steel to avoid corrosion.
• The spring-lock assembly can be assembled without any tools.
• The pivot pins in the collars cannot loosen and fall out.
• The straps are contoured to guide the elbow into the open position for easier removal.
• The spring is located on the radial syphon pipe to minimize the extension into the dryer.

Features

• Stainless steel clamp pad with Teflon shoe
• Optimized profile with low drag
• Large syphon tip opening
• Double-cut, double-bolt clamp secures syphon shoe in place.

Benefits

• Smooth condensate flow into syphon pipe
• Optimal heat transfer with adjustable syphon clearance
• Precise placement of syphon pick-up shoe
• Long performance life with corrosion-resistance materials

Overcoming traditional high-speed syphon limitations

Rotary syphons require high differential steam pressures to evacuate condensate from high-speed paper machine dryers. Stationary syphons are preferred for these applications, because the differential pressure requirement remains low independent of machine speed. This reduces blow through steam and improves dryer operating efficiency.

High speeds, however, can create mechanical problems for stationary syphons. All cantilever stationary syphons are mounted and supported from outside the dryer cylinder. Because the stationary syphon remains fixed in place, it must be able to withstand the impact of the condensate that is rotating with the dryer. Stationary syphons with low stiffness will deflect, vibrate, and eventually fail.

The Kadant Johnson cantilever stationary syphon is designed to provide both improved operating efficiency and mechanical reliability.

The cantilever stationary syphon features axial adjustment of the vertical support to allow for fine-tuning the location of the syphon shoe to ensure the correct location inside the dryer. The horizontal support tube can easily slide into the journal bore and be locked into position. A robust hollow bolt secures the support tube in place, eliminating the potential for small fastener failures.

Designed for difficult applications

The Kadant Johnson PTX rotary joint is designed specifically for the cantilever stationary syphon. This steam joint rigidly supports the horizontal tube (A) that passes through the dryer journal. The tube is held in the rotary joint with a taper lock and a specially designed hollow bolt. The syphon is positioned in the dryer and locked to the horizontal support tube with a single-piece vertical support bracket (B).

The horizontal support tube (A) provides the rigidity needed to resist the impact of condensate on the syphon shoe and the vibrations that can result. This rigidity is further enhanced by the vertical support (B). This one-piece support strengthens and stiffens the vertical syphon pipe, to minimize its deflection and vibration. Decreased vibration allows the syphon shoe clearance to be reliably maintained, resulting in increased drying capacity and consistency of operation.

The syphon shoe (C) has a stainless steel clamp and a Teflon tip to reduce the potential for dryer damage. It has a narrow profile to reduce flow resistance, loading stresses, and vibrations. The double-cut, double-bolt clamp and corrosion resistant material ensure long term performance.

Wide range of applications

With its rigid, stable stationary syphon design, the cantilever syphon consistently operates at low differential pressures with no speed limitations. That makes it particularly suited to applications ranging from low speeds to the highest machine speeds in the paper industry.

Optimum syphon sizing: Kadant Johnson’s exclusive approach

For peak operating effectiveness, the dryer drainage system must be properly sized and matched with the syphon size and type. Selecting and sizing the syphon and system components require critical review of operating conditions (e.g. differential pressure, operating pressure, speed, and condensing rates) for the entire range of grades produced. Changes in paper grades, basis weight, or other machine conditions can alter the dryer performance and efficiency.

Using Kadant Johnson’s proprietary software programs, coupled with decades of experience, we can evaluate the performance and efficiency of alternative syphon systems, and design a system to meet the requirements of even the most demanding applications.