All of the boilers were constructed in accordance with the rules of the Board of Trade for a working pressure of 215 pounds-per-square-inch (psi), and were tested to a pressure of 430 psi. If You set the safeties to blow at the working pressure they will be popping all the time.A fireman John Thompson, who said: They carried 215 pounds of steam all the time. The boilers could not stand any more!
As you say safety valves were on top of each boiler, but the outlet from this valve was piped from the valve all the way up the side of the funnels. This allowed it to discharge high above the decks. Otherwise if a safety lifted and vented straight into the boiler room the results would be very unpleasant for those inside!10% above working pressure mmm that can push it to 236.5 psi! As stated by Cockburn & Co of Liverpool 215 psi and no more!
A fireman John Thompson, who said: They carried 215 pounds of steam all the time. The boilers could not stand any more!
Now here is another question. Looking at Richard P. de Kerbrech excellence book. DOWN AMONGST THE BLACK GANG the sketch drawing of the Scotch boiler. It show the safety valves at the top of the boiler. However when the boilers were been relieved of pressure the noise was almost the point of be deafening and difficult to communicate with officers on launching of lifeboats. So were was these relieve valve set on the boiler?
Actually everything has been tested more then once. The safety valves were tested several times and the time stopped to note when they started to react. The safety valves were set to 25 psi (about 11,60 % over the working pressure).10% above working pressure mmm that can push it to 236.5 psi! As stated by Cockburn & Co of Liverpool 215 psi and no more!
Yes the boilers were hydraulic tested to 430 psi. Which I have to say is a good sound test. But when under full heat not necessary the same results! As I know from own experience testing hydraulic welded joints on pipework and cylinders. Pressure tested twice the working pressure cold could well show no signs of leaks. But when applying working temperatures it can be quite surprising leaks can occur.
Setting the safety relief valves at a set figure. Its important to know what side of the tolerance and the range in %. You have three choices. Plus & Minus of 215 psi. minus of 215 psi or plus on 215 psi. Its also important the test gauge is a current calibrated to.
Oh did he? Strange that he did not quote him what he has to say about Californian. However back to subject. The statements by Tulloch were from the early 1990s. I think they are from 1994 when they were going to inspect the hole on the starboard side of the hull at bow wreck. It was nothing new at it already come up in 1987 when the hole (which Dr. Ballard completely missed) was "discovered" and made public. In truth it has nothing to do with the coal "fire". The hole is far away, no boiler room is located there.Reading Molony book he has drag George Tulloch of RMST Inc into the discussion. Believed that the uncontrolled fire aboard the ship offered reason for attempting to reach New York quickly! Was convinced that iceberg bump triggered a massive explosion that such a blast blew outward hole in the hull! Claim the detonation had been fuelled by gas from the fire had been raging in the bunker!
Do you know the source where he said that?A fireman John Thompson, who said: They carried 215 pounds of steam all the time. The boilers could not stand any more!
If you mean safety valve, on top of each boiler.So were was these relieve valve set on the boiler?
I think people are putting to much in the log books. Log books did not contain details people are looking for.But again we cannot say for 100% what happen in April 1912, as the key evident is missing that of the ship log books from the captain point of view and chief engineer who was the second highest pay crew member on the ship. Plus the fact they both perished to tell their side of the story.
Quite simple, if fire was never put out, the coal bunker had not been empty as stated by Barrett and Hendrickson and those invovlved with working out the coal bunker would be still working on it. Aside from Barrett and Hendickson we also have Dillon who was working clearing out the bunker. Dillon belonged to BR 1 but the boilers were not lit. At the time of the collision he was in the main engine room. If there was still a coal bunker "on fire" he would have been there and not in the main engine room.We hear the story of John Dilley a fireman who claims the fire was never put out and getting worse! As other firemen claim the fire was put out, so who do we believe? But there again were they working for the interest of the company to save their job!
Well... Looking back on this, I tried my best to make the math comprehensive and there are a few gramatic errors most of all the 'a**' word I would like to apologize for. I must have hit ss instead of 'dd' on my keypad & didn't realize. Sorry.According to a period Marine Engineering book, I found this:
In order to set the valve or in other words to find the pressure t which it will blow off, we must know the diameter of the valve; the weight of the valve and valve spindle, the length, weight and center of gravity of the lever and the weight of the ball at the end. The center of gravity of the lever may be found by balancing it on a knife edge.
Then to find the pressure at which the safety valve will blow off:
1. Multiply the weight of the ball in pounds by its distance in inches from the fulcrum.
2: Multiply the weight of the valve and spindle in pounds by their distance in inches from the fulcrum.
3: Multiply the weight of the lever arm in pounds by the distance of its center of gravity from the fulcrum in inches.
Then ass together the three products, (1), (2), and (3).
Divide this sum by the area of the valve in square inches multiplied by its distance from the fulcrum. The result will be the pressure in pounds per square inch.
Example. Suppose a weight of 80 pounds is hung on the end of a lever which weighs 40 pounds. The center of gravity of the lever is 13 inches from the fulcrum and the ball is 38 inches from the fulcrum. The valve and spindle weigh 20 pounds and are 5 inches from the fulcrum. If the valve is 5 inches in diameter at what pressure will the safety valve blow?
(2) 20x5= 100
(3) 40x13= 520
Sum = 3660
The area of the valve is (3.1416 x 5 Squared) / 4 = 19.635 sq. in, and is 5 inches from the fulcrum, hench 3660/ (19.635x5) = 37. + pounds.