Posted on: December 20th, 2021 by Apex Team

Descaling Heat Exchangers

Keep your equipment in tip-top shape by descaling with RYDLYME!

RYDLYME Descaler Preventative Maintenance 

Scale accumulation in shell and tube heat exchangers can rob the equipment’s efficiency. This scale build up can be made of rust, mineral deposits, calcium, limescale and many other corrosive deposits. It is crucial that a preventative maintenance program be put in place utilizing RYDLYME biodegradable descaler and one of Apex Engineering Product’s RYDLYME Industrial Descaling Systems.

Even 1/32” of scale can cost thousands in extra spending to keep the equipment running! More importantly – leaving this scale build up in tubes of the heat exchanger can greatly reduce the lifespan of the equipment. Scale is corrosive to the tube material, eating away at the tubes! Removing this scale will ultimately increase the equipment’s lifespan and efficiency.

Shell and Tube Heat Exchanger Cleaning Methods

Just like in any industry, there is the hard way and the smart way of getting the job done. Traditional methods of tube cleaning such as rodding and hydroblasting are expensive, time consuming and often lead to equipment downtime. In some cases, it’s difficult to even get to the tubes to hydroblast or rod! This can also lead to production loss as well as revenue loss. For a more in depth discussion, visit this page on shell and tube heat exchanger cleaning.

So, now that we’ve talked about the hard way to clean, let’s talk about the smart way to clean. Using RYDLYME Biodegradable Descaler to remove unwanted scale is easy, safe and efficient! The Leading Biodegradable Descaler, RYDLYME, is non-corrosive, non-hazardous and can be disposed of easily! 

Shell and Tube Heat Exchanger Cleaning Procedure

Apex Engineering Products has been around for more than 80 years manufacturing safe chemical solutions, so we know our way around a heat exchanger.

  1. Isolate and drain the water-side of the exchanger to be cleaned.
  2. Place a 1” ball valve between the isolation valves and the heat exchanger on both the supply and return.
  3. Attach the RYDLYME pump and hoses so the RYDLYME will be pumped in the bottom or supply, and back out the top or return.
  4. Begin pumping all the required RYDLYME into the exchanger. Once that is accomplished, begin to add water to complete the circulation. Please note: The calcium deposit will take up volume within the heat exchanger, so you will not be able to add the same amount of water in the beginning.
  5. Continue circulating the solution for the recommended amount of time. As the circulation progresses and the product dissolves the deposits inside the unit, the volume will increase. To account for the increase in volume, please add water to the circulation vessel, as needed. If you begin adding a lot of water, please be aware, it is possible there is a leak in the system.
  6. It is a good idea to periodically check the effectiveness of the solution while circulation is in progress. This can be accomplished by utilizing a pH meter and as long as the solution retains a low pH, the product is active. Should the circulating solution reach a pH of 5.5 to 7.0 before the recommended time is up, you will need to add more RYDLYME and possibly extend the circulation time..
  7. Upon completion of the recommended circulation time, the solution may be purged to a normal sewer and flushed with water. This process is completed by placing the return hose in the drain and adding water to the circulation container until the discharge line runs clear.
  8. The unit is ready to be returned to service.
  9. The same instructions may be used for plate and frame type heat exchangers. For volumes, please follow the noted formula.

Please note: If your situation dictates that you cannot take your heat exchanger off-line, please contact the manufacturer for on-line cleaning instructions.

For detailed instructions please click here to contact our technical staff for assistance.

RYDLYME Biodegradable Descaler Container Sizes

Industrial Descaling Systems

Apex Engineering Products has been manufacturing RYDLYME since 1942. Any customer who has used RYDLYME knows how safe, effective and easy it is to use with wonderful end results and improved efficiencies on various equipment. Apex Engineering Products’ technical team recommends that RYDLYME be circulated throughout the equipment being cleaned. An easy and convenient way to circulate is with one of our many industrial descaling pumping systems.

These descaling systems, specifically manufactured in house for the use of RYDLYME, make cleaning cooling towers, heat exchangers, condensers, vacuum pumps, boilers, chillers and any other water-based equipment a snap. Each of our systems come with robust circulating buckets, Ipex true union valves, Iwaki pumps and many other features that make circulating RYDLYME easy. View these industrial descaling systems and other biodegradable and safe products on our website 




Clean in Place 10CIP Descaling System. Complete system shown in image.


PumpMaster 115

PumpMaster 115v Industrial Descaling System. Image of the descaling system shown.

Cooling Tower Scale

Boiler Scale

Condenser Scale

Chiller Scale