S-Oil's Onsan refinery, in the Ulsan area on South Korea's south-east coast, is an Aramco-owned plant in the middle of a large expansion. For anyone specifying an explosion proof mobile phone for South Korea, that makes the site two things at once: a mature refinery and an active construction project. This page is for the HSE, instrumentation and telecoms teams who decide what is allowed into its classified areas. The IS-04Z1 is designed around intrinsic safety rather than a flameproof enclosure.
Launching Q4 2026 · IECEx and Aramco-affiliate documentation in progress
S-Oil is majority-owned by Saudi Aramco and operates its refinery and petrochemical complex at Onsan, within the greater Ulsan area. Trade press describes the Shaheen project there as a multi-billion-dollar addition, with a residue upgrading complex, an olefin downstream complex, a large mixed-feed cracker and polyethylene, polypropylene and propylene oxide units, scheduled to complete in 2026; check its current status with the site. So the classified areas now span an operating refinery, with crude distillation, conversion, desulphurisation and tank farms, and new petrochemical units as they are commissioned. Gas, vapour and hydrogen are the main concerns, with polymer powder adding dust questions where polyethylene and polypropylene are handled. The site's classification drawings decide the zone for each area.
Five points that shape what S-Oil engineers are likely to ask.
Operators and construction staff share roads and gates. A single enrolled device type with controlled applications is simpler to manage than a mixture of phones and radios. The Zone 1 target, II 2 G Ex ib IIC T4, is the same for either group.
During start-up, engineers walk punch lists and loop checks. Photographs with a GNSS position and a call to the control room from one device cut the paperwork a commissioning team would otherwise carry.
The new polymer units introduce combustible dust to a site that was mainly gas. The IS-04Z1 carries a Zone 21 design target as well as Zone 1, so the same handset can be considered for both, subject to the certificate.
S-Oil operates as a Korean company under KOSHA, while its shareholder brings its own engineering culture. The IECEx file is being prepared so a reviewer from either side can follow the evidence.
Onsan is on the coast, with humid summers and cold winters. IP68 and rugged build are specified for that range, and the 4,000 mAh battery covers a shift outdoors.
Existing units follow a normal pattern of continuous shifts, round sheets and periodic shutdowns, while a project of this size adds a large construction and commissioning workforce moving through the same gates. Operators and construction contractors are not under the same supervision, which is why device ownership, enrolment and wipe matter. Handsets issued to a construction package should be retired as the package hands over to operations, with nothing left on a device that should not stay on site. Confirm with S-Oil how handover, permits and personal devices are managed during commissioning.
An operator walks the existing refinery logging readings, photographing defects and calling the board, on one device.
Commissioning engineers tag defects with a photo and position on a new unit and close them from the device.
A construction contractor returns enrolled devices at handover to operations, and they are wiped and reissued to maintenance.
S-Oil's internal vendor process is not public and Aramco's own approval process applies inside the Kingdom, not here by default, so we make no claim about either. ask the operator's procurement and HSE teams for its requirements before any evaluation. The usual items for a Korean refinery are below.
No. The device is pre-launch and certification is in progress ahead of the Q4 2026 launch. No approval, evaluation or order exists at S-Oil.
Not directly. S-Oil operates as a Korean company under Korean regulation, and Aramco's ownership informs investment-level oversight rather than replacing local approval.
They add combustible dust alongside gas. The IS-04Z1 has both Zone 1 and Zone 21 design targets, but the area drawing and the final certificate decide where it may go.
No. All three are refineries in Korea, two of them in the Ulsan area, but they have different owners and separate procurement.
Tell us the site, the zone and gas group, and roughly how many handsets. The SAMS team replies by email with the datasheet and the certification schedule for South Korea. The IS-04Z1 is pre-launch and certification is in progress, so there is no list price yet; indicative pricing is issued in writing against a stated quantity and site.
Tell us the zone, gas group and operator. We will send the datasheet and the certification schedule for your market.
