Multitech 1777.8/7-10 G3 operating instructions Multitec Commissioning, start-up / Shutdown

Multitec

6Commissioning, start-up / Shutdown

Instructions for boiler feed applications

Limit values for boiler feed water and condensate when using cast iron pump parts: pH value ￿ 9.0 (target: ￿ 9.3)

O2 content ≤0.02 ppm.

These values must be ensured under all operating conditions before entry into the pump. Max. percentage of fresh water: 25%.

Water treatment shall be in accordance with VdTÜV guidelines for feed and boiler water in steam plants of up to 64 bar.

The penetration of air into the system must be avoided by all means.

6.1Commissioning

Caution	Before starting up the pump make sure that the
	following requirements have been met:

-The quality of the concrete foundation is in compliance with the applicable regulations.

-The tolerances stipulated for mounting the unit on the foundation, for shims and alignment have been complied with.

-The pipelines have been connected without warping the pump nozzles.

-Electrical connection and relay settings correspond to the motor rating and comply with the applicable regulations.

-All hydraulic, electrical and mechanical protection devices have been set.

-The pump has been fully primed with the fluid to be pumped.

-The unit’s direction of rotation corresponds to the rotation arrows.

-All connections are leak-free.

Caution	For installation without foundation (e.g. on spring
	elements) care must be taken that all movements
of the pump	unit can be compensated, e.g. by fitting expansion
joints in the discharge and suction lines.

6.1.1 Lubricants Grease-lubricated bearings

The grease-lubricated bearings are packed with grease at the factory (see section 7.2.2).

Oil lubricated bearings

Fill oil of ISO VG 46 quality into the bearing cover (see section 7.2.2).

6.1.2Priming the pump and checks to be carried out

Before each start-up, the pump and the suction line must be completely vented and primed with the fluid to be pumped. The pump has several plugged holes for venting; adequate venting devices can be used in the pipelines. The shut-off valve in the suction or feed line must be fully open.

Fully open all auxiliary connections provided and check the throughflow.

Open shut-off valve ”C” in the vacuum balance line (if any), and close the vacuum-tight shut-off valve ”E” (see 5.4.1).

Caution	Dry running will lead to increased wear on the unit
	and may eventually damage the pump !

If the discharge line is equipped with an automatic check valve, open the minimum flow valve and secure against inadvertent closing.

Exceptions:

-If there is not enough back pressure in the line prior to start-up, the shut-off element must be closed before pump start-up.

-On pumps fitted with a mechanical seal, the mechanical seal will leak only slightly, i.e. practically invisibly (vapour) during operation. It is maintenance-free.

-If the pump is equipped with a gland packing, leakage during operation is normal (see 6.1.6).

Special notes regarding cooled mechanical seals (seal code 64)

-If the pump is equipped with a cooled mechanical seal, vent the seal chamber by opening the screwed plug 903.11 by a quarter turn, then re-tighten.

Pump sizes 32 to 100

Fig. 14

Pump sizes 125 and 150

Fig. 15

Caution The seal chamber has to be vented when the pump is in cold condition before start-up. When venting in hot condition, steam will escape at the vent plug

during the venting process (risk of scalding!) Should it not be possible to avoid opening the seal chamber in hot condition, due to the situation in the plant, a pipe with valve (not included in KSB’s scope of supply) must be installed at the vent hole, in order to lead the steam escaping during venting to another place where there is no danger of scalding. Make sure that this valve cannot be opened during operation.

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