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6

Installation, Operation & Maintenance Instructions  

If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consulted prior to 
their selection and use. In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without 
prior notice. It is dangerous to smoke while handling products made from PTFE. Old and new PTFE products must not be incinerated. ISO 9001 and 
ISO14001 Certified, details available on request.

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                                       IOM-APIPlan74Steam

North America 

United States of America
Tel: 1-847-967-2400 

Europe

 

United Kingdom
Tel:   44-1753-224000 

Latin America 

Brazil
Tel: 55-11-3371-2500 

Middle East & Africa 

United Arab Emirates
Tel: 971-481-27800 

Asia Pacific 

Singapore
Tel: 65-6518-1800 

API PLAN 74 STEAM

SEAL SYSTEMS - STEAM

9. Cold Environments

For environments with low ambient temperatures, winterization features 

may be added to the Plan 74 Steam control panel. These may include:

• 

The panel may be supplied mounted in a heated enclosure. The heating 

element requires electrical connection as part of the installation and 

assembly procedure (see Section 6.2) 

• 

Heat tracing and/or insulation may be required to maintain the 

temperature of the steam in the Plan 74 Steam control panel. This 

heat tracing and/or insulation may be supplied with the Plan 74 Steam 

control panel, or may be applied on site around all pipework and 

components during installation and assembly, leaving room to read 

instruments and operative valves.

• 

Heat tracing is likely to only be required during start-up or standby 

conditions. 

• 

Care must be taken during commissioning and operation, that the  

Plan 74 Steam control panel is brought up to operating temperature 

before the machine is started, and the correct temperature is 

maintained throughout operation.

Содержание API PLAN 74 STEAM

Страница 1: ...trictly adhered to In the event of an operating problem the machinery must be switched off immediately and made safe Problems must be solved promptly Ensure suitable protective clothing is used when maintaining the system Plan 74 Steam control panel systems are commonly used with dual mechanical seal configurations to reduce the hazard potential from flammable explosive toxic or lethal process flu...

Страница 2: ...ould be undertaken to prevent deterioration arising from long term storage Plan 74 Steam control panel system should be replaced in their original packaging and if possible the crate case should be stored away from direct sunlight in a well ventilated building with a hard floor Temperature control is not normally necessary but large temperature fluctuations 40 C 72 F should be avoided If stored ou...

Страница 3: ...y cleaned Remove protection caps from pipes and connections Check all fittings connections for damage replacing if necessary 5 2 Control panel mounting Refer to the appropriate arrangement drawing for mounting details It is recommended that piping between the each panel and the mechanical seal should be kept below 2 meters 72 inches in length wherever possible If this length is exceeded considerat...

Страница 4: ...eplate REQUIRED NOTE High flow alarms are not recommended on Plan 74 Steam control panels with steam barrier gas as the flow includes both the consumption of the mechanical seal condensation of the steam and the steam condensate released by the steam traps therefore flow monitoring is an unreliable method to monitor performance of the mechanical seal c Slowly open the drain valve and allow steam t...

Страница 5: ...nd monitor to ensure values do not breach safe limits B Shut down machine to prevent damage or loss of containment Causes C Excessive leakage across the inboard seal or outboard seal D Pipe work joint failure E Drop in the barrier gas supply pressure flow The signal from the pressure transmitter can be used either LOCALLY with a Klaxon and or beacon REMOTELY in the control room Consult the specifi...

Страница 6: ...API PLAN 74 STEAM SEAL SYSTEMS STEAM 9 Cold Environments For environments with low ambient temperatures winterization features may be added to the Plan 74 Steam control panel These may include The panel may be supplied mounted in a heated enclosure The heating element requires electrical connection as part of the installation and assembly procedure see Section 6 2 Heat tracing and or insulation ma...

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