Danfoss Pumps and ERDs 3-In-1 Energy Recovery Device User Guide
- June 5, 2024
- Danfoss
Table of Contents
Danfoss Pumps and ERDs 3-In-1 Energy Recovery Device
General information
This guideline provides information on how to provide quality photos of individual parts and part groups during inspections of pumps and/or ERDs. This recommendation is for guidance only.
Introduction
In order to provide guidance during pump and ERD inspections, good photographs of individual parts and part groups are required. The goal is for end users and/or customers to provide Danfoss High-Pressure Pump service personnel with high-quality photos, so that critical determination can be made. These include identification of the failure modes present, suggested root causes for the failure modes, and recommendations to limit future failures.
Photos
Photo guides are available for most APP pumps and iSaves, and can be sourced from your Danfoss High-Pressure Pumps service person.
Good/clear photos of parts and part groups are a must for proper guidance. It
is most advantageous to take photos of parts ‘as is’ when the pump is
disassembled, and also take photos of the same parts after cleaning. The
guides show examples of the required photos of individual parts, as well as
the specific surfaces of the parts that are needed to make determinations.
Example of a guide is shown below: 
Photos should be taken of ALL parts in the pump as outlined in the guides, regardless of whether they are damaged or not. It is very common for there to be primary and secondary failure modes present and these are not always apparent to customers and end users.
Tips
Lighting
Good lighting is extremely important when taking photos of component parts. It
is recommended that photos be taken in natural/indirect light or under good
indoor lighting. In general, it is normally better to take photos WITHOUT the
camera flash, since using a flash can wash out important surface details. This
can make many determinations difficult, if not impossible. Sometimes the use
of a camera flash is needed, either due to extremely poor lighting or if there
is a surface detail that cannot be captured by the photographer using natural
light. There are also times when it is better to provide two photos, one with
the camera flash and one without.
Part angling
A best practice used by Danfoss HPP technicians in the field is to examine the
part at different angles relative to the camera and light source, in order to
reveal more surface details. All part surfaces are reflective, especially
black PEEK surfaces after wearing, so this method uses reflected light off the
surface to reveal imperfections not normally be seen by a ‘straight-on’ photo.
The example below highlights this technique.
Water/moisture
Parts should be completely dried with a rag or towel and free from lint. There
should not be any standing water or moisture on the surface. Water will hide
details and can make damaged parts appear good. This is especially true with
the black PEEK part surfaces, such as piston shoes, barrel sleeves, retainer
bearings, port plates, etc.
Files and file sharing
Minimum photo file size should be 1Mb to allow technicians adequate zoom
capability. Smaller file sizes are not adequate and should not be sent. E-mail
is the preferred method for sending photos to Danfoss HPP technicians. File
sharing sites, such as Dropbox, are also an acceptable means of sharing
photos. Since mobile phones are most often used for taking photos, it can be
convenient to text or use applications such as WhatsApp to send photos. This
method is not recommended and should be used as a last resort. In addition to
some file compression, these methods do not allow for proper Danfoss case
creation or proper follow-up methods.
Examples
The photos below were all taken of the same PEEK piston shoe face under
different conditions related to the use of a camera flash and with different
levels of moisture. Which one gives us the best detail? 
Perfect photo
The above photo was taken under natural light with a completely dry surface. The part angling technique was also used to bring out the highest level of surface details.
Danfoss A/S
High PresSure Pumps danfoss.com +45 7488 2222
highpressurepumps@danfoss.com
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