10 Feed Water, Condensate & Steam in E/R

Course 2004

Slide 2

� Purpose of the rules and regulations;

Feed Water, Condensate and Steam System - E/R

� To ensure that steam is generated and distributed to consumers in a safe and reliable way.

Slide 3

Feed Water, Condensate and Steam System - E/R

− Steam boilers with working pressure above 7 bar

Arrangements for preheating and deaeration of feed water before entering the boiler is to be provided.

Preheating arrangement to be capable of maintaining T > 80ºC when the boilers are operated at maximum load during normal seagoing condition/service.

Arrangements are to be provided enabling repair of the heater without interrupting the feed water supply.

Slide 4

Feed Water, Condensate and Steam System - E/R

− Feed water intakes on boilers should have a stop valve and a check valve.

− At least one valve for testing boiler water is to be fitted directly to each boiler.

It is not to be fitted on the water gauge mounting or standpipes.

− Reserve feed water tanks (e.g., FW tanks) to have capacity at least twice the hourly evaporation rate of the main boilers.

− Where fuel oil or lube oil tanks, heaters or purifiers are heat by steam in pipe coils.

The condensate is to be led into an observation tank.

Slide 5

Feed Water, Condensate and Steam System - E/R

− If two or more boilers are connected to a common header or steam manifold.

Steam connection to each boiler is to be provided with two shut-off valves with a free blowing drain in between.

This requirement does not apply to exhaust gas economisers with forced circulation.

Slide 6

Feed Water, Condensate and Steam System - E/R

− Where blow - downs from two or more boilers are connected to a common discharge.

Two valves are to be fitted to each discharge.

− A blow-down valve on the ship’s side is to be fitted in a readily accessible position.

The valve is to be located above the level of the floor in such a way that it is easy to verify whether it is open or shut.

− Boilers with a heating surface ≥ 10m² are to have at least 2 safety valves.

Heating surface < 10m² : at least 1 safety valve.

Slide 7

Feed Water and Steam generating System

Slide 8

C.O.P.T Steam service & condensate System

Slide 9

Condensate System

INCIN. WASTE

OIL TK.

G/E L.O

SETT. TK

M/E L.O

SETT.TK

H.F.O

STOR.

TK(S)

F.W

GENERATOR

M/E JACKET F.W

HEATER

PURIFIERS

SLUDGE

TK

H.F.O

SERV.TK

H.F.O

SETT TK

SEPARATED

BILGE OIL TK

F.O

OVERFLOW /

DRAIN TANKH.F.O

STOR.

TK(P)

ACCOMMODATION TO

AIR COND. PLANT

TO ATMOS. DRN/

DUMP CONDENSER

FM DECK STEAM

SERV.LINE

FM DRAIN SEPARATOR

& TURBINE STEAM

MANIFOLD DRAIN

FM LINE

TRACING

FM LINE

TRACING

AUX. BLR F.O

HEATERS

M/E F.O

HEATERS

G/E F.O

HEATERS

MAIN L.O PURI.

HEATERS

H.F.O PURI.

HEATERS

AUX. BOILER ATOM.

STEAM DRAIN

FM LINE

TRACING

Slide 10

Aux. Boiler

Slide 11

Aux. Boiler (Drum Type)

Slide 12

Safety valve

Slide 13

Cascade Tank

Slide 14

Feed Water Temp – O2 Content

Slide 15

REGULATING VALVE

Temperature Control Valve (Direct acting Type)

Slide 16

REGULATING VALVE

Pressure Regulating Valve (Pneumatic Type)

Slide 17

REGULATING VALVE

Pressure Regulating Valve (Electro-pneumatic Type)

Slide 18

REGULATING VALVE

Pressure Regulating Valve (Electronic Type)

Slide 19

REGULATING VALVE

Temperature Control Valve (Pneumatic Type)

Slide 20

REGULATING VALVE

Temperature Control Valve (Electro-pneumatic Type)

Slide 21

REGULATING VALVE

Temperature Control Valve (Electric Type)

Slide 22

REGULATING VALVE

Temperature Regulating Valve (Direct acting type)

Slide 23

STEAM TRAP

� Steam traps are automatic valves that release condensed steam (condensate) from a steam space while preventing the loss of live steam.

� Steam traps are designed to maintain steam energy efficiency for performing specific tasks such as heating a building or maintaining heat for process use.

� reference: www1.eere.energy.gov/femp/operations_maintenance/om_sttypes.html

Slide 24

STEAM TRAP

� Once steam has transferred heat through a process and becomes hot water, it is removed by the trap from the steam side as condensate and either returned to the boiler via condensate return lines or discharged to the atmosphere, which is a wasteful practice.

� Type

1 Mechanical Steam Trap

2 Thermostatic Steam Trap

3Thermodynamic Steam Trap

Slide 25

STEAM TRAP

1. Mechanical Steam Trap

- The operation of a mechanical steam trap is driven by the difference in density between condensate and steam.

- Types

Ball float

Inverted bucket

Slide 26

STEAM TRAP

Ball Float Trap

- The denser condensate rests on the bottom of any vessel containing the two fluids. As additional condensate is generated, its level in the vessel will rise. This action is transmitted to a valve via either a "free float" or a float and connecting levers in a mechanical steam trap.

Slide 27

STEAM TRAP

Inverted bucket type

Slide 28

STEAM TRAP

2. Thermostatic Steam Trap

- the operation of a thermostatic steam trap is driven by the difference in temperature between steam and sub-cooled condensate.

- Type

1 Bellows Trap

2 Thermo Wax Trap

3 Bimetallic Trap

Slide 29

STEAM TRAP

1 Bellows Trap 2 Thermo Wax Trap

3 Bimetalic Trap

Slide 30

STEAM TRAP

3. Thermodynamic Steam Trap (Disc Trap)

- Thermodynamic trap valves are driven by differences in the pressure applied by steam and condensate, with the presence of steam or condensate within the trap being affected by the design of the trap and its impact on local flow velocity and pressure.

Slide 31

� References;

Feed Water, Condensate and Steam System - E/R

- SOLAS 1974 as amended Ch.II-1 Reg.32 and 33

- DNV Rules for Ships Pt.4 Ch.6 Sec.5F/G

- DNV Rules for Ships Pt.4 Ch.7 Sec.6