Commissioning And Shut-Down; Commissioning; Safety Precautions - Andritz HP 45 Série Instructions De Service

Series HP 45
3.4.5 Pressure tests
• Observe the relevant directives.
• Adhere to permitted nominal pressure levels for individual
components.
• Consider the overlapping of pump pressures at pumps in-
stalled in series.
3.4.6 Auxiliary pipe connections
Sealing and flushing media:
• Connect the pipes.
• Install a regulating valve and a magnet valve (closed without
current).
• Blocking and flushing pressure must be at least 0.5 bar above
the maximum pressure of the pump.
• Set the amounts of blocking and flushing media with the reg-
ulating valve.
Quench media:
• Discharge media without pressure into the quench chamber.
• When using pumps which are fitted with a dual-action me-
chanical seal in tandem arrangement then fit the quench con-
tainer approx. 1.5 m above the mechanical seal.

4. Commissioning and shut-down

4.1

Commissioning

Before switching on the pump ensure that the following points
have been checked and carried out:
• Check the alignment between pump and motor when operat-
ing horizontal pumps with flexible coupling (see para. 3.3.2).
• Check that the fastening bolts of pump and motor are secure.
• Check that the installation of the pump ensures easy access
to the functional controls.
• Check the non-return valve of pump on its tightness.
4.1.1 Bearings
See para. 5.2.1.
4.1.2 Shaft sealing
Observe any specific instructions, cross-sections, dimension
sheets or appendices.
4.1.2.1 Gland packing
• Use the loose gland packing which has been delivered along
with the set.
• Tighten the gland gently and evenly by hand.
• Gland packing must not be allowed to stick to the shaft. The
shaft must remain freely moveable.
4.1.2.2 Mechanical seal
For pumps with a single mechanical seal with quench arrange-
ment and quench reservoir: Depending on the liquid to be
pumped the quench reservoir should be filled to half its capacity
with water or other liquid.
4.1.3 Filling and venting
• Close the discharge isolation valve and, if fitted, open the inlet
isolating valve.
• Fill the pump with the liquid to be pumped, and totally vent. If
arranged for operation on a suction lift then use a filling funnel
or pipe.
20
• If vent screws are present on the suction or pressure side of
the casing, open them to let air escape.
• In case of filled discharge pipe, the pump can be filled through
the delivery non-return valve by-pass or lifting lever (if fitted).
• Turn the pump shaft several times by hand. The pump is
vented when air bubbles no longer escape from the vent
holes.
• Fill the auxiliary valves for sealing and flushing media with
water and purge the system of any air. Close the screw plugs
and the vent plugs.
• Pumps fitted with mechanical seal: Open the vent plugs of
the seal cavity (where fitted). Fill the seal cavity with water
and purge the system of air.
• Pumps fitted with mechanical seal and quick aerator:
Loosen sealing cap of air intake catch before commissioning
(approx. 2 turns). Do not remove cap completely to avoid dirt
penetration.
• Before starting check the seal cavity for trapped air. The seal
may be seriously damaged by dry running! After checking, re-
place the plugs.
• Function of a mechanical seal: Two slide faces rub against
each other and are lubricated by a liquid film at the same time.
In the case of single-action mechanical seals, the film is
formed by a pumping medium. A leakage of between 0.2 and
5 ml/h is possible depending on running smoothness, pres-
sure, rotational speed and shaft diameter (mechanical seals
are wearing parts for which no guarantee can be given).
4.1.4 Electrical connections
Electrical installations may only be carried out by
qualified personnel in compliance with IEEE Regula-
tions and Statutory Requirements.
• The motor must be provided with motor protection switch.
• The electricity supply and frequency provided must match the
motor nameplate details.
• The motor terminal links must be positioned to suit the supply
and the proposed starting arrangement.
4.1.5 Checking the direction of rotation
The rotational direction must comply with the marking on the
pump. Use a rotating field gauge. If a gauge is not available
then, providing that the pump contains water or is separated
from the drive, the motor can be briefly activated and then im-
mediately shut off to carry out the test. If the rotation has to be
reversed, then arrange for this to be carried out by an electri-
cian.
Do not run pump counter to its given operation direction (direc-
tion arrow on casing).
4.2

Safety precautions

Do not operate the pump set before fixing guards for
moving parts such as the coupling etc. If guards are
not delivered with pump then they must be provided
by the installer before operation. Do not reach under
guards with hands!