Análisis

PACKING AND SHIPMENT

If not specified differently in the order the BURGMANN standard packaging is used, suited for dry transport by truck, train or plane. The signs and notes for handling on the packaging have to be observed.

In addition seaworthy packing may become necessary.

STORAGE AND PRESERVATION

• Range of validity

The following recommendations apply to all BURGMANN Mechanical Seals which have been supplied and stored in their undamaged original packing as well as to seals which have been installed in a component of a plant (e.g pump, compressor, agitator, etc.) but have not yet been put into operation.

• General

BURGMANN mechanical seals for components of power plants are super finished and tested machine elements whose handling during the erecting and start-up period of a power plant as well as during the storage period (in particular of spare parts) entails certain measures to keep the full efficiency of the seals.

Sliding materials and elastomers are subject to material-specific and time-based alterations (distortion, aging) which might reduce the full efficiency of the seals.

Yet, such processes must not occur automatically .

The mechanical seal may be stored welded onto vapour-safe plastics sheets by adding a drying agent e.g. “SILICAGEL”.

Damages caused by improper storage may not be claimed on the BURGMANN company with reference to their warranty.

INSTALLED BURGMANN – M.S.

Components of power plants which are equipped with BURGMANN mechanical seals are usually delivered in a completely mounted state. Often the parts were tested at works beforehand.

• Start-up at the power plant

For the start up of BURGMANN mechanical seals as well as of possible accessories extra instructions have to be observed which consider the respective conditions.

New product plants often have erection times of up to 10 years. In such cases the period between the production of the M.S. and its installation and start-up may exceed the usual period of approximately 2-3 years.

BURGMANN recommend to disassemble such seals in time before the planned start-up of the components of power plant and to sent the seals to the manufacturer or the nearest BURGMANN service centre where they can be checked and reconditioned, if necessary.

If this is not possible for primary reasons (distance, dispatch conditions, etc.) other companies (never other seal manufacturers!) may be charged if they are suitably equipped and have the know-how required. Yet, BURGMANN’S confirmation for recognition as safe is absolutely necessary in particular with regard to claims under warranty.

• Preservation in case of installation

Check in case of a preservation of complete plants with mechanical seals installed

• the compatibility of the chosen preservation agent with the seal materials and with elastomers.

• No impairment of the seal’s axial movability by conglutination or by gumming.

We recommend to dry the seal parts after the preceding functional test and to keep them dry when being installed. Values of < 50 % relative humidity are considered as dry condition. If there are uncertainties as to the correct proceeding please contact BURGMANN.

STORAGE OF BURGMANN-M.S.

Premises

The mechanical seals have to be stored in dry, dust free, moderately ventilated and tempered rooms. We recommend relative air humidity below 65 % temperature between 15°C and 25°C.

Direct exposure of the mechanical seal to heat (sun, heating) as well as to oxone, present or produced by ultraviolet light (halogen of fluorescent lamps), must be avoided because of the risk of embrittlement of elastomer materials.

Handling

• Store the seals in their original packing lying on a flat surface.

Thus a protection from shocks and from damage of edges is provided.

For storage the mechanical seal is welded into vapour-safe plastic sheets by adding the drying agent “ SILICAGEL ”. Thus the humidity inside the packaging is stabilized.

The packaging should be periodically checked for damage.

An easy control of the package contents is provide due to the transparent polyethylene sheet as well as by the attached package list or the package label.

Check the mechanical seal :

• after a storage period of approximately 2-3 years.

• after a damage of the packing

• after a shock on the mechanical seal (e.g. by dropping the packed seal) at the manufacturer’s or at the nearest service centre.

If necessary, a different, evident component authority may be contacted. Yet, BURGMANN must be informed about this fact, as BURGAMANN’s confirmation for recognition as a safe is absolutely necessary.

NOTE : An installation of the M.S. is possible if the prescribed checks cannot be carried out for special reasons, yet, only if the seal parts have no visible damages.

BURMANN must be informed about this kind of installation. Otherwise a warranty as to leakage and/or operational reliability will be refused by BURGMANN.

A possibly increased leakage during start-up will decrease to a normal quantity after the running in period of the sliding faces.

If this is not the case or if there are other malfunctions the mechanical seal has to be shut down, removed and checked for reasons of safety.

If there is a malfunction which you cannot correct on your own, or if the cause of malfunction is not clearly recognizable please immediately contact the nearest BURGMANN agency, a BURGMANN service centre or the BURGMANN headquarters.

• Control of humidity inside the packaging

All water vapour-proof sheets inside the package are supplied with humidity indicators which show the relative air humidity inside the packaging. On a scale the colour changes from blue (=dry) to pink (=humid).

For check of the stored mechanical seals which should be carried out periodically and should be recorded in-plant the following points have to be observed :

• Humidity is indicated with values > 50% rel. humidity :

⇒ Contact BURGMANN as a control of the seal and new packaging is necessary.

• Humidity is indicated with values < 50% rel. humidity, yet the storage period of 2-3 years is exceeded.

⇒ Contact BURGMANN as a control of the seal and new packaging is necessary.

3.2 Preparation for assembly

Check the parts of the machine for :

• Chamfered edges (sliding cones i.e. 30°/2 mm or in accordance with DIN 24960).

• radiused transmissions

• Mating fits and O-ring surfaces: fine finished Rz 10 µm (=N7=CLA 63).

• Shaft surface in the area of the M.S.: fine finished Rmax. 5 µm (=N6=CLA 32) Check at the machine :

• Damage of connecting surfaces to the M.S.

• Mating dimensions, rectangularity and concentricity to the shaft axis.

• Direction of rotation must comply with the seal drawing, otherwise contact BURGMANN immediately.

• Insert a parallel key into the groove provided.

• Lubricate the shaft slightly in the area of the seal.

Elastomers made of EP-rubber must never come into contact with lubricants on the base of material oil (swelling, decomposition)

Lubricant for elastomers (o-rings etc.) recommended by BURGMANN.

TURMOPOLGREASE SH2 << make Lubricant Consult (LUBCON) 3.3 Assembly / installation

The mechanical seal is supplied as a cartridge unit, pre-mounted at works, and does not require any adjustment during installation. This document provides the required information for Installation and removal of the cartridge only.

For installation the assembly drawing 09-H75F2/100-EX2 has to be on hand.

The mechanical seal has to be installed very carefully and under the cleanest conditions.

Do never force during installation.

The order of assembly to install the mechanical seal into the pump depends on the design of the pump and should advisably be determined by the pump manufacturer.

Possible installation order :

• Check of o-rings (5 and 7) have been installed.

• Feed the complete seal cartridge onto the shaft.

The key in the shaft has to be engage into the keyway in the shaft sleeve (6).

Avoid bumping the seal cartridge against the shaft or shaft steps as the brittle ceramic components break easily.

• Bolt the mechanical seal to the assembly flange in such a way that the connections for supply and disposal are positioned in accordance with view

“X” in the drawing.

• Tighten the set screw (12a) uniformly & firmly.

• Remove the assembly fixtures (17) and keep them for a later removal of the seal.

3.4 Supply connections

The supply connection is designated as a female threaded NPT connection.

The connection for supply is marked on the mechanical seal.

• Remove the plastic protection cap from the supply connection after installation.

Supply piping :

• Use pipes of stainless steel with a big cross-section.

• Install the pipes continuously rising, as short and convenient as possible for the flow to ensure self-venting.

• Avoid air inclusions and provide for venting connections, if necessary.

• Clean the piping thoroughly. Fasten all pipe connections pressure-sealed.

4. OPERATION

4.1 Instructions for start up Safety checks before start up

• Seal assembly fixtures disengaged

• Torque transmission and axial fixing between mechanical seal and shaft duly installed.

• Supply connections tightened pressure-sealed.

For a safe operation of the mechanical seal a circulation circuit is required. Design in accordance with the scheme in the assembly drawing. Supply fluid flows from stuffing box through a filter and a cooler back to stuffing box, similar to API 610, Plan 23.

Forced circulation of the fluid when the shaft rotates by means of a unirotational pumping device in the seal.

Jacket cooling of the stuffing box is provided in the pump and should be operated for reasons of longer service life.

• Flood pump and seal cavity (stuffing box) with medium.

• Thoroughly vent seal cavity and circulation system.

• After a short startup period repeat the venting procedures several times with the pump being at standstill.

Now the seal is ready for operation.

4.2 Instructions for safe operation :

Safe operating can be expected when observing the following seal circuit temperatures, measured at seal outlet :

• Warning temperature : 55°C

• Shut-off temperature : 65°C

• Standstill temperature : 75°C

If the operation limit values and the instructions given in this manual are followed a trouble-free operation of the mechanical seal can be expected.

4.3 Instructions for worker’s protection :

Hot medium or even steam may splash out if the seal falls. Personally injury many be prevented by the user providing for splash protection and wearing safety goggles. Care has to be taken by the use for proper disposal of the leakage.

4.4 Directives in case of failure

Try to define the kind of failure and record it.

In case of failure due to high leakage the amount of leakage should be observed.

Changes of the operating conditions have to be recorded. In case of an unacceptable temperature rise the mechanical seal must be shut down for reasons of safety.

A damage of the mechanical seal is indicated by a continuous, flowing leakage.

If there is a malfunction which you cannot correct on your own, or if the cause of malfunction is not clearly recognizable please immediately contact the nearest BURGMANN agency, a BURGMANN service centre of the BURGMANN headquarters.

During the warranty period the mechanical seal must only be disassembled or removed the BURGMANN’s approval or when a BURGMANN representative is present.

5 SERVICING