Removable Tube Sheet Heat Exchanger

Removable Tube Sheet Heat Exchangers Manufacturer INDIA


Tube removal is a process that involves
cutting tubes, pulling out tubes and tube stubs, and even knocking tubes
out of the vessel. You can look to Elliott for all your tube removal
needs ranging from tube cutters to tube tuggers to pneumatic hammers.The
tube removal process includes several process steps that must be
performed with critical sequencing and tolerances. The initial step of
our process is the Tungsten Inert Gas (TIG) shrinking of the tube
to-tube sheet expansion joints where applicable, which is performed with
our standard plug removal TIG system.
Specifications :The TIG process is carefully monitored for power and travel so that only designated areas
in the tube are shrunk. For some tubes with minimal tube sheet contact, shrinking is not required.Applications :Tube Removers-One or a combination of the three below methods is used to remove a tube from a boiler or chiller vessel Tube Cutters- Tube
Cutters are used to internally cut from the inside to the outside of the
tube behind the tube sheet on one end. This lessens the force required
to pull a tube. To eliminate tube cutting chips in the vessel, tubes
should be scored and not totally cut through. The tube cutter needs to
have sufficient reach to cut behind the tube sheet. Proper lubrication
and cutting speed will increase cutting blade life. Tube Pullers- Used to
break the seal and pull expanded tubes from a tube sheet. A spear or
expanding collet is inserted and engaged into the tube inner diameter. A
ram or gun applies force to exert an extracting force on the tube. The
power to pull the tube is generated manually or through an hydraulic
pump. The hydraulic pump can be manually, electrically or pneumatically
driven. The pulling force required will vary with the tube size and
wall, the depth of the tube sheet and tube material. Pneumatic Hammers-Pneumatic
Hammers are an alternative method to remove tube stubs from heat
exchangers and boilers. Maintenance technicians use piloted knockout
tools to avoid damage to the tube sheet. The knockout tool is inserted
into the tube and the impact pneumatic hammer is actuated to punch out
the tube stub.Tube Installation (Tube Expanders)-
Tube Expanding is the art of reducing a tube wall by compressing the
outer diameter of the tube against a fixed container such as rolling
tubes into tube sheets, drums, ferrules or flanges. Construction of heat
exchangers, boilers, and surface condenser tubes is mainly limited to
copper, steel, stainless steel, and cast iron with exceptions such as
the use of titanium in ultra high pressure vessel applications. To
assure a proper tube joint, the tube wall must be reduced by a
predetermined percentage dependent upon the material the tube is
constructedAdvantages :Hard rolled and tubes the shrinking process is necessary to relieve the radial stress between the tube and tube sheet.