Machine Parts

Boiler Internal Problem and Solution All boiler internal problem and solution they must follow the manufacturer guideline. There are 50 boiler internal problem and solutions are given bellow: 1. Leakage: Problem: a. The boiler blowdown valve was found to be leaking. b. Leakage was observed in the level transmitter nipple. c. Leakage was observed in the welding of the dummy flange nipple. d. Leakage was found in the feed water suction line. e. Leakage found in boiler outlet valve. f. Leakage found in main steam valve and valve in common header. g. A droplet was observed in the water level gauge glass. h. Gasket leakages were observed: nipple leakage on top of the boiler, in handhole and manhole. i. Gas leakage was observed in two joints of the gas line piping. Solution: a. The blowdown or drain valve must be replaced. b. Level transmitter nipple must be tightened. c. Repair the leakage. d. Repair the leakage of the feed water suction line. e. Leakage mus

Boiler operation Boiler working procedure: The boiler is supplied with water by a feed pump. Water enters the boiler through a feed check valve. When the water reaches normal water level which is approximately the middle of the water gauge glasses, the feed pump is stopped by the dual control. The burner is bolted to the hinged front door. Air required for combustion is provided by a forced draught fan which is integral with the burner unit. The furnace receives heat radiant from the flame and the hot gases from the flame give up heat to tubes in the second pass as they travel to the front chamber. Gases turn into front chamber and give up more heat to the tubes in the third pass as they travel to the rear chamber. The gases leave the boiler by the chimney at the top of the rear chamber. As the steam pressure rises the pressure has been shown in pressure gauge. When the pressure is sufficiently high the main stop valve can be opened to allow steam to pa

Control Panel: All electrical equipment's p rewired to a control panel which is normally mounted on the side of the boiler. One also can made by own modulating or sealing dampers and final electrical connections. Most of the boiler connection fit a 3 phase 4 wire to the isolator within the control panel, however the boiler may have been supplied suitable for other electrical configurations. One boiler control panel contain Sequence Time: Sequence Time is used for regulation and flame supervision of the burner. Starters: Starters is used for forced draught fan/oil pump motor and feed pump motor. Fuses, Relays and Switches used for control Functions Indicator light and Alarms used for normal and fault conditions.

Why Boiler Safety Valve is more important? Boiler safety Valve: Boiler safety valve is one of important parts of boiler mounting and fittings. The boiler safety valve ensures that the boiler can not reach to excessive steam pressure, should the boiler limit control fail. The type of safety valve fitted or prepare as British Standard as a high lift type. The safety valve settings has been adjusted prior to the boiler leaving ones manufacturer factory. A plate on the safety valve specifies the operating conditions for which the valve was supplied. Once set the valve setting must not be tempered with. To prevent this the padlock keys should be kept in a safe place under the supervision of responsible qualified person.

The Cochran is a package unit covering a range of evaporations. The Cochran boiler is a three pass wet back design. The first pass is the furnace and the second and third passes are two nests of small bore smoke tubes. All plain tubes are expanded except for boilers with working pressure of 13.79 bar= 200 lb/inch2 and over when the second pass tubes are expande3d and seal welded into the reversal chamber. All the required number of stay tubes and stay bars are fitted in all boilers. All stay tubes are welded into the tube plates and reversal chamber. Stay bars are welded into the tube plates. The flue gas outlet is normally positioned vertically on the rear casing. The Cochran boiler internal access is through an elliptical manhole with a removable door which is provided on top of the boiler. A muddoor is fitted to each tube plate. Access to the rear chamber is achieved by removing the side doors of the rear casing. Whilst access to the front chamber is provided by ope

                          Boiler Boiler: A steam boiler is usually a closed vessel made of steel. Its function is to transfer the heat produced by the combustion of fuel to water and ultimately to generate steam. Types of boiler:            1. Fire tube or smoke tube boiler            2. Water tube boiler                                                                                                             Figure: Boiler Fire tube boiler: In fire tube steam boilers, the flames and hot gases, produced by the combustion of fuel pass through the tubes which are surrounded by water. Fire tube boilers are generally used for relatively small steam capacities and low to medium steam pressure. As a guideline fire tube boilers are completive for steam rates up to 12000kg/h and pressures up to 18 kg/cm².Fire tube boilers are available for operation with oil, gas or solid fuel.