Seal suits intermediate and batch processes
A
Flowserve product story
Edited by the Engineeringtalk editorial team
Mar 1, 2006
Single mechanical cartridge seal for Ansi and Din pump services, where the pumps and seals are required to operate in multiple chemical environments without chemical compatibility change-outs.
Flowserve has launched the GCX single mechanical cartridge seal for Ansi and Din pump services, where the pumps and seals are required to operate in multiple chemical environments without chemical compatibility change-outs.
The seal is suitable for intermediate and batch chemical processes in short-run chemical plants and in multiple campaign specialty chemical and pharmaceutical plants using solvents and steam for decontamination.
Built with durable metals to withstand corrosion and harsh chemical conditions, the GCX has an alloy C-276 bellows, 316 stainless steel components and flexible graphite foil secondary seals.
Elastomer components are not suitable for variable, harsh chemical conditions, and are susceptible to corrosion and degradation, especially in multiple chemical applications.
The metallurgical components in the GCX also let it operate in a wider temperature range than elastomer-based seals.
Batch processing and intermediate chemical pumps often handle multiple pH level products as the processing moves from start to completion.
Because secondary seal conversion during these changing processes is not possible, a seal needs to withstand these differing conditions.
This ability to work in various chemical environments means the seal can reduce lifecycle costs, including teardown costs.
The GCX provides sealing for tough multiple exposure applications dynamically, statically and during process changeover in chemical pumps from various manufacturers.
"The GCX is perfect for pumps in aggressive and multiple exposure chemical applications," said Mark Fallek, VP of Marketing at Flowserve.
"Chemical streams often have unknown compatibility".
"These streams can include different chemical and batch processes, as well as proprietary chemical mixtures".
"Seals using a predominance of elastomer components are inadequate for this type of service".
"The GCX gives plant managers in these chemical facilities a high-reliability seal that does not have to be changed out every time the process changes".
"Because it works across applications, it allows plant managers to standardise inventory and reduce inventory costs".
With no dynamic O ring, the stationary bellows design of the GCX, based on the Flowserve ISC bellows seal, avoids seal hang-up in coking applications.
Its canned sleeve design prevents installation damage to its silicon carbide rotor, which is held in compression with a graphite foil secondary seal for maximum chemical compatibility.
The alloy C-276 drive mechanism and minor parts are isolated from the process fluid to reduce chemical stress.
An inboard shaft O ring resists particulate build-up underneath the seal sleeve, facilitating easy removal of the seal.
A standard throttle bushing with vent and drain ports allows the use of nitrogen or steam quench to mitigate coking.
Designed as an OEM or aftermarket seal, the compact design fits most stuffing boxes in non-group one Ansi or Din sized pumps.
Its cartridge design enables easy installation and removal for service, and is compatible with enlarged and standard bore seal chambers.
Field-tested in various chemical processes, the GCX has a high mean time between repair.
Standard operating limits include pressures between 0 and 13.8bar, temperatures between -40 and +204C and speeds up to 15.2m/s.
The GCX is available in eight standard imperial sizes (1.125 to 2.625inch) and six standard metric sizes (33 to 65mm).
The seal will be on display at Acehma 2006 hall eight, stand H2-J9.
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