Originally posted by orangetom1999V00263 A
V01368 A I am assuming here that steam is used to pre heat the fuel oil
in a tank or heat exchanger type unit before sending it to the
V00276 C yep
V01055 B yep
V01368 A B
You assumed correctly, however, the fuel oil would leak into the steam. Leaving a visible oil film inside the inspection tank.
V01378 D B
That was a tough one. I honestly can't tell you why... I'll try to dig up a reasoning.
V01568 C yep
V01728 D B
V01738 B yes sir
V01748 C B
A marine steam generator onboard the S.S. Wilfred Sykes.
A general report on the S.S. Wilfred Sykes I wrote while receiving training. I have some more in depth ones if you would like as well.
Ron Paul (subliminal messaging :lol
Vessel: S.S. Wilfred Sykes
Company: Central Marine Logistics
Length: 661.1 ft.
Breadth: 70.2 ft.
Draft: 32.3 ft.
Gross Tonnage: 12729
Boilers: Two oil fired C-E type V2M boilers. Each boiler is constructed of a steam drum and a water (mud) drum connected by banks of inclined
generating tubes, waterwall tubes, refractory, superheater tubes, air heaters, and casing. The boiler exhaust (gas) makes a single pass out the
• Designed by Combustion Engineering – Superheater Inc.
• Design pressure – 525 psi
• Operating Pressure (Superheater outlet) – 450 psi
• Hydrostatic Test (Maximum) – 788 psi
• Safety valve settings
o Steam Drum – 520-525 psi
o Superheater – 466 psi
• Here are the actual 2005 fit-out safety valve settings done by the U.S.C.G. and recorded in the ships engine room log.
o Port Boiler (lifted/seated psig)
ß Superheater – 495/475
ß Fwd drum – 505/495
ß Aft drum – 510/485
o Starboard Boiler (lifted/seated psig)
ß Superheater – 480/470
ß Fwd drum – 520/500
ß Aft drum – 510/490
o Steam @ normal rating (S.H. outlet) - 750° F
o Feedwater to drum - 315° F
o Air to oil burners - 350° F
• Evaporation (lb./hr.)
o Normal Rating – 32,000
o Maximum – 48,000
• Furnace Volume
o 550 cubic feet
• Heating Surface (sq. ft.)
o Boiler – 3,900
o Water Wall – 270
o Superheater – 780
o Air Heater – 2,600
• Weights (lbs.)
o Cold water to fill boiler (completely full) – 18,000
o Cold water to fill superheater – 1,100
o Total cold water to fill unit completely – 19,100
o Total cold water to fill boiler to normal level – 13,500
o Boiler, dry, complete with fittings – 124,000
o Water, steaming condition – 11,000
o Total “one” boiler, steaming condition – 135,000
Tube Data (type - # of tubes/O.D. inches/min. wall thickness in inches)
• Boiler Tubes - 60/2/.120
• Finned Boiler Tubes – 20/2/.135
• Boiler Tubes – 909/1.25/.095
• Side Wall Tubes – 38/2/.120
• Roof Tubes – 7/2/.120
• Rear Waterwall Tubes – 18/2/.120
• Floor Tubes – 14/2/.120
• S.H. Elements – 37/1.25/.120
• Air Heater Tubes – 945/1.5/.083
o 2048 total tubes per boiler.
Boiler Tubes: Your basic generating tubes running vertical in the boiler from the water drum to the steam drum. Larger Diameter tubes located closer
to the burners with smaller ones behind the superheater elements.
Finned Boiler Tubes: Tubes with fins placed directly in front of the superheater elements. The fins force exhaust gas to pass through the
Water Walls: The floor, side wall, rear wall, and roof of the furnace are water walls. The flow through the water wall circuit is parallel to the
boiler circuit; the flow is from the water drum to the distributing header then up to the steam drum through the water wall tubes.
Superheater: Vertical, interbank, convention type with four-pass steam flow. The superheater tubes are made of U-bends and run parallel to the
Desuperheater: A submerged type desuperheater is located below the water level in the steam drum to provide reduced temperature auxiliary steam.
Air Heater: Horizontal tubular type air heater mounted on gas outlet of boiler. Airflow is two pass; gas flow is single pass. Air heater bypass
damper is installed for low rating operation; the engineer at the control console controls this damper.
Safety Valves: Four 2” type 1415-A valves on the steam drums. Two 2” type 1415-C valves on the superheater outlet.
COPES Pressure Regulating Valve: A special valve that regulates feedwater pressure to the feedwater regulating valve. This valves sole purpose is to
reduce the feedwater pressure from the pumps by 50 psi to limit stress on the feedwater regulating valve.
Feedwater Regulating Valve: Regulates the amount of feedwater entering the steam drum to keep a constant level in the drum.
D.A. Tank Spillage Regulator: A regulating valve located just before the 1st stage heater that controls the amount of condensate that gets sent back
to the feedwater reserve tank instead of up to the D.A. tank.
Hot well Regulating Valve: Controls the amount of water sent to the feedwater pumps from the hot well. There is a small “foot valve” located
near the control console that the engineer on watch can use to send extra water to the hot well from the reserve feed tank if needed.
Safety Valve Popping and Seating Pressure Adjustment:
When adjusting a safety valve, gags are placed on the other valves. A recently calibrated pressure gauge is used for checking and adjusting safety
valves. Connect the pressure gauge to the steam drum for checking the boiler safety valves. Connect the pressure gauge to the superheater outlet to
check the superheater safety valve. Under no circumstances set the safety valves to pop or reseat at any pressure other than those stamped on the
safety valve nameplate, except by permission of the proper authority (USCG).
To adjust the popping pressure, remove the cap, top lever, and drop lever. Loosen the compression screw lock nut. Tighten the compression screw to
increase popping pressure. Loosen the compression screw to lower the popping pressure. Do not turn the compression screw more than one flat without
testing the safety valve. Tighten the lock nut before testing.
Increasing the popping pressure will increase the blowdown (reseating pressure). While lowering the popping pressure will decrease blowdown. The
blowdown is increased by raising the adjusting ring (counterclockwise) and decreased by lowering it (clockwise).
Boiler tubes are inspected at lay-up in a cold boiler. Occasionally a tube is defective and needs to be removed from service. A quick way to do
this is to plug the tube until enough are plugged that replacement tubes need to be installed.
Be sure the tube ends and plugs are perfectly clean to assure a metal-to-metal contact when the plug is driven into the tube end. Then the tube must
be punctured to prevent it from building up in pressure when the boiler is put back in service, or cut out completely except for about 2 inches on
either side of the tube. A plugged waterwall tube or a 2 inch boiler tube, which is easily accessible, should be replaced at the earliest
opportunity. A 1.25 inch boiler tube can be left plugged indefinitely.
Replacement of Boiler Tubes:
Working on the inside of the drum, slot and crimp the faulty tube ends until the tube can be driven from the tube hole. Tubes, which are easily
accessible, can be cut off an inch or two from the drum. The remaining nipples can be removed, working either from the outside or inside of the
Clean the tube holes carefully, removing all scale and rust. Clean the replacement tube ends to bright metal using emery cloth. Clean the inside of
the tube to remove the protective coating. This may be done by pulling a kerosene soaked swab through with a wire, and then blowing out thoroughly
with a steam hose.
Enter the tube in the tube holes and clamp in position. The tube ends must project into the drum 3/8 of an inch (plus or minus an 1/8 of an inch) to
allow for belling with the “tube expander” tool.
Notice the temp and pressure of the S.H. (Super Heated) steam. Will take a leg or arm off and cauterize it at the same time. Just from walking
through a leak. Can't see it either. Can just hear it. I mean HEAR it... You use broom handles and wave them along the S.H. lines to find
I can get some more basic questions if you would like Tom. I just pulled that section out without reading what the questions were about.
[edit on 28-3-2007 by LostSailor]