Technical Tip:
Shipboard staffs require frequent engineering tips to brush up and hone their skills. As a professional Superintendent or a Vessel Manager, you can offer a quick tip as you visit the ship so that they can grasp it quickly and remember it forever.
One such tip is all about observing pressure gauges in the hydraulic systems. Whenever there is a continuous jump or spikes in the pressure gauge (especially on the pump’s discharge or downstream of the system), then it is most likely due to air in the hydraulic system.
In such cases, it is essential to release the air from the hydraulic system. Such entrapment of air or gas will be released into the expansion tank over a period as the system operates. However, if there is a continuation of such jump in the pressure gauge, it is most likely that air is being sucked into the system. The air ingress in the system can also be confirmed by an observable change in sound while the pump is running.
What can be done when air is being sucked into the hydraulic system?
- Spray some lubricating oil on the pump’s shaft seal as a test of air ingress past the seal.
- You should hear a momentary change (quieting) in the pump’s sound, indicating less aeration.
- Alternatively you can consider applying a thin coat of grease on the shaft seals.
- Grease can also be used on the filter covers/joints and pipe flanges to check for air ingress. It is to be noted that the hydraulic lines are usually seamless lines with minimal bends and adjoining flanges.
Contaminants of hydraulic oil are broadly defined as any substance that impairs the proper functioning of the fluid. Air fits this definition, and whenever air gets entrained within the oil, corrective action is required to prevent damage to both the oil and the other components in the hydraulic system.
Air can be present in four forms:
- Free air – such as a pocket of air trapped in part of a system.
- Dissolved air – hydraulic oil contains between 6 and 12 percent by volume of dissolved air.
- Entrained air – air bubbles typically less than 1 mm in diameter dispersed in the oil.
- Foam – air bubbles typically greater than 1 mm in diameter that congregate on the surface of the oil.
Of these four forms, entrained air is the most problematic. Pre-filling components and proper bleeding of the hydraulic system during start-up will usually eliminate free air. Small amounts of foam are cosmetic and do not pose a problem. However, if large volumes of foam are present, it’s sufficient enough to cause the reservoir to overflow. For example, this can be a symptom of a more serious air contamination and/or oil degradation problem. This problem is not associated with hydraulic systems alone, but also with any positive displacement pumps used on board the ship.
Did you find this Technical Tip Interesting?
Do share a Technical Tip with MFAME’s Elite Community. We are all ears to your technical expertise and experience.
Write to us: experts@mfame.guru
There is no guarantee that you will win real money, but the best real money online casinos will make sure to increase your winning chances through online casino bonuses and promotions. To that end, we’ve assessed each bonus the casinos offer to understand the terms and ensure they are equally fair to all players. One of the most important considerations for signing up with a new online casino? The bonuses, of course! Every online casino worth your time and money should be offering you benefits as a new user. Simply put, if the casino doesn’t offer you a nice bonus when you sign up, it’s probably not worth your money. Here is a breakdown of some of the most common bonus types on online casinos: Security Without a proper gambling licence, not even the best UK online casinos 2023 would be considered reliable. Keep your distance; without a licence, they offer no security. Most of the best UK online casinos will be fully licensed by the Government of UK or another reputable jurisdiction. When looking for the top UK online casinos, check that they are properly licensed, have a location, and use strong encryption. A search bar with a small padlock icon shows that the site is encrypted and safe.
http://papa-wiki.win/index.php?title=Bonus_all_iscrizione_senza_deposito
Since their history started in 2002, over 750,000 users have signed up to play at CasinoEuro. Corporate management has also launched successful sister sites. More recently, head office has invested in its live casino lounge, allowing customers to interact and play with world-class dealers in real-time. This combined with a finely tuned customer support team and creative sign up packages ensures Casino Euro has a promising future ahead. Since their history started in 2002, over 750,000 users have signed up to play at CasinoEuro. Corporate management has also launched successful sister sites. More recently, head office has invested in its live casino lounge, allowing customers to interact and play with world-class dealers in real-time. This combined with a finely tuned customer support team and creative sign up packages ensures Casino Euro has a promising future ahead.
mefougner at gmail 5 mg cialis generic india Arout CA, Sofuoglu M, Bastian LA, Rosenheck RA
My husband works on a ship which is about to get a new stainless steel pressure gauge. So he was just hoping to learn a little about how to read one so that if he’s ever around their new one, he can help. So thank you for saying that when there is continuous jumping in the pressure gauge, it is probably because of air in the hydraulic system.