Stresses in Piping systems

Hi all,

This is one of my favourite topics, since I had a large number of systems piping failures related to stress, mostly external.

One of the flange connections of the fire main systems on board a ship, couple of bolts used to break at the head frequently; more often if the ship had done some high-speed manoeuvres.  Initially, we used to change the bolt and live with it, but a nagging doubt came into our minds and we did a root cause analysis. What we finally found was that, the last pipe that fitted into the system was a little oversized and had been forced into its slot using a chain pulley, thus leading to a stressed piping section. Whenever high vibrations occurred, the stress used to increase, thus resulting in the flange securing bolts at one end shearing.

I came across a nice article on the topic. Please read and be enlightened on the topic.




Condition Based Maintenance – Monitoring Tools


I keep getting updates on new products used in the maintenance field through various online subscriptions.

Here is a link that shows the us of Ultrasound devices in the condition based maintenance strategy. I am not trying to sell the product, but am just trying to propagate the techniques involved. Please connect to the link given below and learn more.


Case Study on Advantages of Proper alignment of Rotating Machinery Assemblies


Good, within tolerance, mechanical alignment between the driving motor and driven components is one of the basic health requirements.

I came across an excellent case study for which the link is given below.

Proper alignment helps one plant keep on pumping.

Please go through and be enlightened.


Improper bolting has the biggest impact on machine reliability and life cycle cost


One would not come across such down to earth articles every day.

Simple examples on using the right fasteners at the right places and tightening them correctly has been covered in the article linked below:

Machinery | Improper bolting — Improper bolting has the biggest impact on machine reliability and life cycle cost | Plant Services.

Using the right tools to work on fasteners is also important. The tendency to use pipe wrenches as a one tool for all fasteners lead to rounded bolt heads and joints that cannot be opened easily. Same goes for adjustable jaw pump wrenches also.

Please read and be re-trained on fasteners tightening.


CMMS/EAM Software Review: 9 trends spurring CMMS/EAM evolution


Plants Services is one magazine that I subscribe to. It comes up with highly readable material, written by knowledgeable people.

The latest issue had an article on CMMS / EAM evolution. Please click on the link below to access and read the same.

CMMS/EAM Software Review: 9 trends spurring CMMS/EAM evolution.



Good vibrations – Bad vibrations – Back to Balance

Hi all,

Years spent operating and maintaining marine gas turbines on ships have left me very sensitive to the issue of bad vibrations. The salt-laden humid sea air entering the compressor section of the marine gas turbines leave salt deposits on the blades. If not attended to regularly, the deposits will tend to foul the air flow and lead to something known as “Compressor surge”, that leads to air flow becoming disturbed and oscillating from and to the turbine end. This surge can cause catastrophic failure of the turbine as a whole, due to the sporadic and violent directional changes in axial loading on the bearings.

Taking another type of equipment this time; High speed exhaust blowers connected to automobile paintshops tend to collect paint sludge and vapour condensation on the blades over time. This causes imbalance to the rotor and leads to bad vibrations. If not corrected in time, premature bearing failure and catastrophic damage to the equipment can occur.

I came about a well written article in the recent edition of Plant Services e magazine. The link to the article is given below.

Tactics and Practices: Back to balance.

Please read and be enlightened.

Condition Based Maintenance or Predictive Maintenance practices for critical equipment can help the maintenance personnel to lesser job stress and higher labour productivity.