Multitec
7.4.1Tightening torques - Tie bolts, part No. 905 Material codes 10, 11, 12, 13 (casing: cast iron)
Pump size | Tightening torque Nm | ||
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Multitec 32 | 85 |
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Multitec 50 | 140 |
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Multitec 65 | 250 |
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Multitec 100 | 395 |
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Multitec 125 | 600 |
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Multitec 150 | 700 |
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Material code 20 to 30 |
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(Casing: steel or stainless steel) |
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Pump size | Operating pressure |
| Tightening torque |
| (bar) |
| Nm |
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Multitec 32 |
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| 150 |
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Multitec 50 |
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| 240 |
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Multitec 65 | All |
| 430 |
Multitec 100 |
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| 680 |
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Multitec 125 |
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| 1370 |
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Multitec 150 | ≤ 40 |
| 1500 |
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> 40 |
| 2000 | |
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7.4.2Reassembly of hydraulic system
Reassembly of the hydraulic system starts at the suction end and proceeds towards the discharge end. It is advisable to place the pump in vertical position for reassembly. The sequence of reassembly does not pose any special problems and shall be realized in accordance with the detailed sectional drawing and list of components. The components shall be
A clearance of 0.7 to 1.2 mm shall be set between the last impeller 230.1 or 230.3 and the balance drum
When tightening the tie bolts, proceed as follows:
-Tighten the nuts of tie bolts 905 gently, with the pump in vertical position.
-Set the pump horizontally onto its feet on the assembly table.
-Tighten the nuts of tie bolts 905 in two steps (first step: 50% of nominal torque, second step: nominal torque) in the sequence 1.4.2.3.
12
3 4
Fig. 37
7.4.3Seals
Gland packing
Before
Caution Packing rings must be inserted so that the cut edge of each ring is displaced by approx. 90 to
120 in relation to the previous one.
Slip the
On gland packings with lantern ring (for vacuum operation), the lantern ring is mounted instead of the next to last packing ring (the last packing ring is located in the seal chamber on the pump side).
Tighten the gland cover by hand at first. Use a feeler gauge to check the level position of the gland cover. It must be easy to turn the rotor by hand.
Leakage is normal during pump commissioning. After approx. 5 minutes’ operating period, the amount of leakage can be reduced by steadily tightening the nuts of the gland cover by 1/6 of a turn. Keep an eye on the amount of leakage and the water temperature. It takes several hours of pump operation for the gland to be adjusted completely. There must be a high leakage rate during the
Repeat this procedure every 5 minutes until a minimum value is reached.
Dimensions in |
| Pump size |
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mm | 32 - 50 - 65 | 100 | 125 |
| 150 |
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Packing | 10 j | 12,5 j |
| 16 j | |
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Length of | ≈181 | ≈223 | ≈254 |
| ≈306 |
packing cord |
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Number of | 5 |
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| 6 | |
packing rings |
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Stuffing box housing |
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| da |
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| di |
| l |
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Pump size | di | da | l |
32 - 50 - 65 | 45 | 65 | 50 |
100 | 56 | 80 | 60 |
125 | 66 | 90 | 72 |
150 | 78 | 110 | 96 |
Fig. 38 Gland chamber dimensions
21
