Pre-Purchase Inspections
May/June 2009 - Steering Valves

"That's the way we've always done it (also known as TTWWADI) and it's never been a problem". Whenever I hear that refrain from a boat builder, boat yard or contractor after I've pointed out that a piece of equipment has been improperly selected or installed it immediately captures my attention. It tells me that their approach toward vessel systems and design as well as equipment installation probably isn't what it should be. Failing to do things the right way, the way the manufacturer of the equipment or appliance specifies, guarantees one to be on the losing side of a technical as well as a moral argument. Defending this as a TTWWADI approach simply ensures that the grave they dig is only that much deeper.

All vessel systems, from navigation lights and engine room ventilation to inverters and propulsion engines are important. Some systems do, however, fall into the "critical" category. Systems in which a failure or malfunction would lead to injury to the crew, fire, flooding or loss of power or control clearly must function with the greatest reliability. As I carry out vessel inspections my sense of awareness regarding the proper design and installation of these systems, in accordance with the manufacturer's guidelines, is especially high.

The image shown in this month's ad, taken aboard a vessel undergoing an SDMC Systems Inspection, in all likelihood represents a case of TTWWADI. The valve body shown in the mirror, access to these components is often difficult, is installed as part of the vessel's hydraulic steering system. It's used to isolate the autopilot in this case, however, they may also be used as cross over valves to facilitate the use of a manual tiller or to afford isolation to remote helm stations on the bridge or in a cockpit. The valve is correctly installed and free of leaks, however, with a 600 WOG rating (WOG means the valve is suitable for water, oil or gas use) it's inadequate for the application. Most manual hydraulic steering systems and autopilot pumps call for components that are capable of withstanding a minimum of 1,000 psi. Regrettably, this is an oversight I encounter all too frequently aboard both new and used vessels. Ultimately, the result is often profuse leakage and loss of steering.

If you’re interested in finding out more about pre-purchase inspections, vessel selection assist, the Captains’ Club (simply click on these words to be taken to the relevant sections of this website) or other services offered by Steve D’Antonio Marine Consulting, send an email or call 804-776-0219.