Various technical solutions and components are used for explosion protection of pumps and high-pressure cleaning solutions on the electrical as well as on the mechanical side.
Electrically, for example, capsule solutions such as flameproof housings "Exd" or the pressurized enclosure "p" are often implemented in the systems. Drive systems consist of frequency inverter-controlled Exd, Exde and ExnA three-phase motors (LV and MV). Exde control boxes are provided for operation and monitoring in harsh environments.
Explosion-proof Exi-, Exe-field distributors are made of glass fiber reinforced plastic or stainless steel. Further components for explosion protection of high-pressure technology are Ex installation system technologies such as intrinsically safe circuits, conduit installations according to NEC 505, fieldbus technology, pressure, differential pressure, flow and level transmitters and switches as well as safety barriers and MMC monitoring systems.
On the mechanical side, the emphasis is on avoiding effective ignition sources. By means of an ignition hazard assessment, each potential ignition source contained in the device is checked in accordance with DIN EN 1127-1: 2011 and, if necessary, appropriate measures are taken depending on the required equipment category and explosion group. These measures include, for example:
• special selection of materials
• arithmetic and experimental component design including lead of life certificates
• Measures to prevent electrostatic charge
• Measuring and possibly limiting the max. surface temperature
Added to this - also on the mechanical side - special protective measures, such as flameproof enclosures or liquid encapsulations.