Crack of ammonia water circulating pump pump shell shell this how repair?

Ammonia water circulating pump is mainly used in the ammonia from summary pool to upright carbide furnace gas collector, to spray on the gas, in order to achieve the purpose of cooling and separation of oil and gas. Ammonia water circulating pump pump shell is commonly use grey cast iron castings. Grey cast iron has good casting and cutting performance, the price is cheap, but high carbon content, large material brittleness, containing impurities, and tensile strength is low, the lack of plasticity and toughness, in the process of transportation, running and so on, is likely to produce cracks, and even local damage.

1, ammonia water circulating pump pump shell crack of shell this how repair? Repair of ammonia water circulating pump shell crack commonly used the following methods: 1)

Repair welding method

hot repair welding technology is complex, suitable for larger parts more stress or shape change. In before welding, the pump shell is placed within the mold made of water resistant brick, with yellow sand, put charcoal or coke, around the pump shell preheating, time is 2 - 5h。 Preheating shall make temperature is gradually increased, gradually heated to 500. Red c around, make the pump shell, then put the pump shell welding parts show, the rest of the parts with asbestos board cover, with a cast iron welding electrode or stainless steel electrode. After welding, the pump shell in the slow cooling furnace nature, recede internal stress.

       2） Cold repair welding method

cold repair welding technology, need not special preheating before welding, welding without heating, can omni-directional welding, can simplify the process, save the heating equipment, reduce cost and improve the welding conditions, welding pieces of basic deformation and residual stress is small.

cold repair welding repair technology is introduced as follows:

1) Welding groove, the pump shell play ping Smm, the crack front 5 mm deep l5 - 20 mm of check in. With the Angle of grinding wheel crack invisible into V or U groove, deep 10 to 20 mm, 15 - wide 20 mm, the groove shall be smooth and clean. With the Angle of grinding wheel in the repair welding area of the groove around 1 oomm above the width of the grinded surface of metallic luster.

       （ 2) Welding material selection of nickel and iron welding rod, welding wire must be dry, remove skin moisture, prevent the welds produced when porosity.

       （ 3) With a oxygen acetylene flame before welding groove and the groove in heated to around 200 mm l50 ℃ or so, remove the organic matter of groove and moisture, prevent the repair welding defects such as porosity, slag inclusion, pump casing repair area equilibrium temperature, at the same time to prevent the cracks due to temperature stress. DaiGong cooled to 40 - 60 ℃ when welding.

       （ 4) Welds, the using of small current, short arc, make the pump shell heat affected area as small as possible, to prevent shrinkage cracks.

       （ 5) After each welding a, arc just extinguished, bead while still in the red state, with a hammer hammer pass quickly, with the external force to help its plastic elongation and reduce the thermal stress, improve the compactness, at the same time to clean up the residue.

       （ 6) After completion of welding repair, shall be immediately with asbestos cloth for thermal insulation on the pump shell, make its slow cooling to room temperature.

       3） Epoxy glass cloth paste method:

epoxy resin high bonding strength, toughness, good resistance to water. With epoxy glass cloth paste method to fracture of the water pump shell or local damage repair, has low cost, high efficiency, low labor intensity, the advantages of easy construction at the scene. Repair process is as follows.

       （ 1) Surface treatment with fine first cast iron welding electrode in the water pump shell surface roughcast, polishing machine grinding pump shell surface, remove surface dirt and welding slag, and the pump shell surface with dilute sulphuric acid and acetone cleaning twice, remove rust, grease and oil dirties, on the surface of the surface clean, floating dust, oil, and dry.

       （ 2) Plate making if local damaged to repair the pump shell, is on the inner wall of the pump shell lining board, at the same time with a tool. Main role is to prevent the epoxy resin in repairing, at the same time as the epoxy resin paste glass cloth lining board.

       （ 3) Epoxy resin preparation method to repair the impeller, epoxy resin can't be too thin, to prevent the paste epoxy resin.

       （ 4) Paste first brush with wool dipped epoxy resin brush pump shell surface, and then shearing first glass wool cloth, crack width than the pump shell or local damage zone 20 ~ 30 cm wide, on the pump housing. Local damage is larger, if the water pump can be paste in the glass cloth fine metal mesh, increase the intensity. Posted when push-pull gently with the hand or the sharp, squeezed in the middle of the bubble, and gently with scraper compaction leveling, then brush epoxy resin. After the paste 3 layer of glass cloth, wait for 3 ~ 5 h, continue to epoxy resin after curing. Paste thickness depending on the length of cracks or breakage degree.

       （ 5) After the maintenance, repair, the pump shell in 20 ~ 30 ℃ and relative humidity lower environment, slowly curing 48 h.

       （ 6) Quality inspection to quality inspection of the repaired pump shell, key check whether there is epoxy resin surface crack, whether joint shell become warped edge, epoxy glass cloth strength and bonding geometry.

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