Goulds-pumps ANSI FAMILY IOM (ATEX Compliant) User Manual download pdf (Page 52)

MAINTENANCE OF SHAFT SEALS

The mechanical seal used in an ATEX

classified environment must be properly

certified.

MECHANICAL SEALS

When mechanical seals are furnished, a

manufacturer’s reference drawing is supplied with the

data package. This drawing should be kept for future

use when performing maintenance and adjusting the

seal. The seal drawing will also specify required flush

liquid and attachment points. The seal and all flush

piping must be checked and installed as needed prior

to starting the pump.

The life of a mechanical seal depends on various

factors such as cleanliness of the liquid handled and

its lubricating properties. Due to the diversity of

operating conditions it is, however, not possible to

give definite indications as to its life.

! WARNING

Never operate the pump without liquid supplied

to mechanical seal. Running a mechanical seal

dry, even for a few seconds, can cause seal

damage and must be avoided. Physical injury

can occur if mechanical seal fails.

PACKED STUFFING BOX

(3196, CV 3196, HT 3196, LF 3196, 3796)

Packed stuffing boxes are not allowed in an

ATEX classified environment.

Packing operation can be inspected without shutting

down or disassembling the pump. During normal

operation the packing should leak approximately one

drop per minute. If the drip rate is higher or lower

than one drop per minute then an adjustment of the

gland may be required. To slow down the leakage

rate, the two gland bolts should be tightened evenly

one-quarter (¼) turn each until the desired leakage

rate is obtained. NEVER over-tighten packing to the

point where less than one drop per minute is

observed. Overtightening can cause excessive wear

and power consumption during operation. If the

packing cannot be tightened to obtain less than two

drops per minute, then the packing may need to be

replaced and the packing installation procedures

under Operation should be followed.

CAUTION

Never attempt to replace packing until the

driver is properly locked out and the coupling

spacer is removed.

DYNAMIC SEAL (3196, CV 3196, LF 3196)

Dynamic seals are not allowed in an ATEX

classified environment.

Dynamic Seal Components

Repeller - The dynamic repeller effectively prevents

leakage of pumpage through the stuffing box when

the pump is operating under published acceptable

conditions. Dynamic seal parts do not wear

substantially to affect operation unless the service is

particularly abrasive or corrosive. Refer to

Disassembly and Reassembly Section for

maintenance, disassembly, and repair.

50 ANSIFAM IOM - 5/08

Fig. 36

Dynamic Seal with Packing

1 2 ... 47 48 49 50 51 52 53 54 55 56

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Goulds-pumps ANSI FAMILY IOM (ATEX Compliant) User Manual Page 52

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