NZ Pulp & Paper Industry
New Zealand’s largest chlorine production and storage site required additional gas detection. The age of the plant was an important factor in the risk assessment potential for gas leaks of one of the most toxic industrial gases. Replacement of existing detectors had traditionally been on an ad-hoc basis and the hazardous area standard acceptable in the New Zealand market had changed from ATEX to IEC Ex. There was also increased interest from the customer for instruments that met an international Safety Integrity Level (SIL 2 or SIL3).
There are a number of toxic gases on this site, including chlorine, chlorine dioxide, ammonia, hydrogen sulphide as well as flammable gases such as methane which is the main constituent of natural gas used on boilers, furnace and kilns.
We presented a solution that used a common transmitter (or detector) for most of the toxic gas applications mentioned above that “ticked all of the boxes”. The differences were in the sensor inserts that were specific to each gas. In addition, these transmitters met the new IEC Ex hazardous are requirements plus the SIL rating. The versatility of this transmitter reduced the customer’s inventory and has enabled various maintenance staff and contractors to become familiar with one common instrument. This was important to enable staff to cover other departments of the plant where they were previously not involved .
We were also able to offer gas detectors from within our supplier’s multi-brand portfolio for the other specialised and difficult applications which coincided with an expansion of the chemical plant and upgrading of older gas detectors elsewhere in the plant.
Required bellows sealed globe control valve for dry Chlorine service. The valve design must prove zero emissions to the environment due to the danger to humans.
We provided a valve design compliant to Chlorine Institute Pamphlet 6 and Euro Chlor specification (and pressure ratings) per Euro Chlor GEST 89/140. In addition, our valves have an accessible bellows design which allows for total inspection of the bellows, plug and seat for wear, which then can be reassembled easily if no maintenance is required and without consumable parts needed. This is a unique design feature that is not offered by competing brands.