×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Piston rod

Piston rod

Piston rod

(OP)

We have a problem, one of our compressor the piston rod was crack, it is suspected caused by condenseble material (ie. moisture / water content ). Can someone explain us What is the mechanism of piston rod cracking that caused by condenseble material ?, if true the cracking is caused by condenseble material, what is the condition or parameter that is able to this problem occur ?

RE: Piston rod

There are a lot of things that could cause your problem, but a little more information is needed. The failure could be from mechanical or corrosion, or other.

What are you compressing?
The rod material of construction?
Where on the rod did it crack/break?
How long was the service life of the rod?
Is the rod plated?

RE: Piston rod

(OP)
Hi Uncleasyd,

Thank for you comment, following are the answer for your questions :
1. The gas that  compressed is mix H2 70 % and CO 30 %.
2. The rod material construction is stainles steel 13 chrom.
3. The rod crack position on the top near piston.
4. The service life still one year.
5. The rod no plated.

RE: Piston rod

Did the rod crack completely or only partially through?
If the rod is only partially crack see if you can break it open and examine the fracture surface.
     You may have to cut into the bad side.  Do not disturb the fracture surface, keep fingers and tools off of it.
Can you take a hardness reading on the piston rod and compare with your specifications?
If there was condensate or liquid present you probably have torn up a lot more
Have you checked the threads on the crosshead end?
Where did the crack originate?
What are the operating conditions, temp, pressure?
Was this an OEM piston rod or a replace part from a different source?

RE: Piston rod

The connection between a piston rod cracking and compressing condensible material is that you will get liquid condensing in the cylinder during the compression stroke. When the piston gets to the top of its stroke it will be pushing liquid out instead of gas. This can cause the piston to deadhead with damage to the piston or shaft. Gas compessors are not designed to pump liquids. Although the designs are similar they operate at different speeds.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources