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Hello Eng-Tips, I'm currently having a huge problem with our vendor for Cast Simplex and Duplex bilge and fuel manifolds. They keep pushing out our delivery date, I'm too the breaking point because they were suppose deliever them in March, they keep pushing them back and today I get an e-mail...

I'm a 2007 grad, I interned for a small company through school and went to work for them for another nine months after school to help them finish a project. Moved on to another company and decided to go for my PE recently. Guess what after four years experience I wasn't able to go for my PE...

In short I need to place fittings on a tank. No big deal if they weld the fittings on, then weld the tank in place followed by sandblasting and painting the inside of the steel tank. If only things could be that easy. The sandblasters and painters are ready to get started now and the welders...

I just got that magainze yesterday, what do you know. I read the article and it defiently furthered my knowledge of the topic, but I'm looking for equations or rules of thumb on how big and how many zincs are needed.

I think the title pretty much says it all. I'm a mechanical engineer working in the marine industry so I have a basic understanding of corrosion and cathodic protection, but that is it. I'm trying to find information or a lead on how to calculate the number/size/amount of zincs I need to...

The cracking area is one of the two failure modes of a key. So I'm trying to calculate the area, asking for the sample isn't so easy when we don't have one. I eventually came across a website that I was confident enough with to proceed. The cracking area is the length of the key times the...

I've been asked to calculate the cracking area of a shaft key. What is the cracking area? I know the shear area is the length of the key times the width. Thanks in advance

So to follow up we never found the problem. We bleed the system over and over to make sure all the air was out of the system and we didn't see a change. We replaced the sequence valve cartridges and the counter balance cartridges, no change. The final solution we came up with is just separate...

Will do, but the Yacht is already gone and it might take a bit of time for us to catch up with it and make changes. I'm trying to get possible solutions now.

Compositepro, You might be on to something there. I was thinking what about the compresibility of the fluid because we have long runs to the dog cylinders, but I couldn't ever convince myself one way or the other, but I didn't think about flexibility of the hose. The long runs are suppose to...

Actually I take that back the required force to open the door is always increaseing until it is fully opened.

Gerhardl, Everything in the system is rated to 3000 psi except the smaller dog cylinders which are only rated to 2000 psi. The dog cylinders have no acting load and only require a small force to retract. The door opens just about at 1000 psi. We have tried adjusting the flow control settings...

I've recently completed a large hydraulically actuated door on a yacht. I used a sequence valve to make it a two step process. The first step unlocks the dogging cylinders followed by the opening of the transom door. We have built similar doors in the past, but on a smaller scale with...

I am using a sequence valve with two cylinders, 1 small cylinder and 1 large cylinder. In order to extend the large cylinder in a reasonable time I have to have a large flow rate. The problem is the flow rate will be too high for the smaller cylinder. So my question is how can I slow down the...

I would say I'm looking more for a career mentor because even though I work at a boat building company I still do mechanical work, piping, hydraulics, engines, automation and so forth. I've been here a couple of months and when I do have a marine oriented question I know who I can go to. I...

Hi I've been reading a lot of posts, have done a little posting myself and have found this forum and its members to be very helpful. I graduated in May '07 with a degree in Mechanical Engineering and recently started a new job building boats in Seattle. I came across an article on Training...

Thanks for the comment, but I'm not 100 percent sure what you mean Ace. The larger cylinder will be doing work the entire extension because it is moving a load. Can you give me an example of an application where a cylinder wouldn't do work the entire extension because it still has to over come...

Thanks Ted, I appreciate being able to bounce thoughts off of you. Andrew

Thanks Ted for your response. I do want a higher flowrate for the larger cylinder. I went through the entire system and calculated the fluid velocity in each hose and pipe section and made sure to keep the velocity within an acceptable amount. A -10 will work for the larger cylinder. The...

Okay maybe I gave the post title the wrong name. For anyone that has questions about Dash Sizes the link I've attached should help clear that up. My question is more based around why would someone make a part with a -12 fitting unless it required a -12 fitting. I don't think they would. So...