Three-year regular full-time B.Sc. with Mathematics, Physics and Chemistry or Industrial Chemistry as notified. Must be completed by 30-11-2026 from recognized regular full-time course (recognized lateral-entry diploma accepted for 105/107). Min 50% normally, eligible SC/ST/PwBD reserved category 45%. No other unlisted branch, broad equivalence, distance/part-time course, or specified higher professional qualification. One B.Sc. candidate can choose only code 101 or 103, not both.

Required: No · Description: No mandatory work-experience requirement. Past apprenticeship, if any, has specified waiting-period and second-discipline rules.

Description: SC/ST +5 and OBC-NCL +3 for eligible reserved categories. PwBD +10; further +5 for eligible PwBD-SC/ST and +3 for eligible PwBD-OBC-NCL where applicable. Class X Board document controls DOB. No invented DOB interval.

Code 101 — Trade Apprentice, Attendant Operator (Chemical Plant): 190 seats

At IndianOil Barauni Refinery, Chemical discipline. Duration: 12 months. First application: NAPS, then Barauni additional-data form. Code 101 is the largest pool in this notification: 190 of the 272 provisional openings. That does not make every science graduate eligible; the specific three-year, regular full-time Maths–Physics–Chemistry / Industrial Chemistry B.Sc. route remains the controlling criterion.

Original reservation for this exact code

PwBD identified seats: zero in code 101. The notice restricts notified PwBD-identified apprentice seats to codes 105 and 107, citing safety risks of refining activities. The vertical seats above are the real code-101 counts and must not be inflated by horizontally reserved places from another code.

The qualification difference from the Boiler trade

A three-year full-time B.Sc. covering the specifically named Mathematics, Physics and Chemistry or Industrial Chemistry pathway is required. For code 101 the training title explicitly refers to the Chemical Plant; for code 103 the title is Boiler and training runs 24 months. Both use NAPS, but the same candidate must select one trade. A diploma in Chemical Engineering, however relevant it might appear, does not replace a B.Sc. unless the advertisement expressly lists it—it does not.

The aggregate threshold is 50% in the prescribed qualification or 45% only for an eligible SC/ST/PwBD applicant applying against an applicable reserved place. Regular full-time study is necessary. For this programme, do not confuse the absence of a separate entrance test with absence of eligibility checks: result date, aggregate, study mode and discipline all face document verification.

NAPS application path for Chemical Plant Attendant Operator

Open the IndianOil official apprenticeship listing for Barauni Refinery 2026–27 (II). Under NAPS, confirm IndianOil Barauni establishment E11191000001 and apply to the actual code 101 opportunity. Complete the extra Barauni Microsoft Form through the same IndianOil listing, entering the same email, mobile, enrolment number and academic details. Both submissions must finish by 6 December 2026. A second simultaneous application to code 103 defeats the one-trade rule; the notice requires exactly one discipline.

What controls the merit outcome and verification

For this code, IndianOil ranks candidates by the aggregate of the qualifying three-year B.Sc., not by a fictitious chemical engineering written paper and not by the candidate’s Class X plus degree average. If candidates tie, the older person ranks first; if DOB also matches, the higher Matric percentage breaks the tie. A provisional shortlist is tentatively expected 11 December and document verification 14–18 December 2026, with the exact schedule and shortlist to be confirmed officially. Bring original B.Sc. marks, completion/result date proof and regular-full-time evidence if applicable, DOB certificate, valid category documents, apprenticeship declaration and NAPS registration evidence. The training begins only after eligible documentary and medical clearance.

Conditions during training

Monthly stipend Not specified as a rupee figure; applicable statutory/IndianOil rules govern it. No HRA or company accommodation is promised. Safety shoes and a returnable helmet, where applicable, and the notified leave and accident-insurance protections apply. Twelve months of training does not carry an absorption guarantee or a promise of a regular operator position.

12-month trade/technician apprenticeship training in refinery operations and maintenance environment as specified generally in the notification; the notice does not list separately promised daily task allocations or permanent job duties for code 101.

Official Barauni Refinery code 101: UR 88, EWS 19, SC 30, ST 2, OBC-NCL 51 = 190. PwBD 0 is an identified horizontal inclusion, never an additional vacancy. Only codes 105 and 107 identify PwBD slots.

Three-year regular full-time B.Sc. with Mathematics, Physics and Chemistry or Industrial Chemistry as notified. Must be completed by 30-11-2026 from recognized regular full-time course (recognized lateral-entry diploma accepted for 105/107). Min 50% normally, eligible SC/ST/PwBD reserved category 45%. No other unlisted branch, broad equivalence, distance/part-time course, or specified higher professional qualification. One B.Sc. candidate can choose only code 101 or 103, not both.

Required: No · Description: No mandatory work-experience requirement. Past apprenticeship, if any, has specified waiting-period and second-discipline rules.

Description: SC/ST +5 and OBC-NCL +3 for eligible reserved categories. PwBD +10; further +5 for eligible PwBD-SC/ST and +3 for eligible PwBD-OBC-NCL where applicable. Class X Board document controls DOB. No invented DOB interval.

Code 103 — Trade Apprentice (Boiler), Mechanical discipline: 38 seats

Notified training duration: 24 months, unlike the other three codes’ 12 months. This is a Trade Apprentice opening, and the first application must be made in NAPS with the separate IndianOil Barauni form completed afterwards. It is not the Technician Apprentice (Mechanical) diploma path, which is code 105.

Official seat register for the Boiler programme

No PwBD-identified seats are notified under this Boiler code. The training location is Barauni Refinery, not an unspecified IndianOil depot or pipelines installation. The official table calls the discipline Mechanical, but the essential educational qualification is a three-year regular B.Sc. with Mathematics, Physics and Chemistry or Industrial Chemistry. That detail is decisive: merely holding a mechanical engineering diploma does not make someone eligible for this code. The mechanical diploma belongs to code 105 and is a separate academic route.

Why the two-year duration matters

A Boiler applicant undertakes a 24-month apprenticeship as the published duration, while code 101’s chemical-plant attendant operator track is 12 months. The notice does not supply a special rupee stipend for the additional twelve months; it refers to the general statutory stipend arrangements and IndianOil guidelines. Nor does a longer period create an employment claim at the end. Candidates choosing between 101 and 103 must weigh the one-trade-only restriction alongside the two different training durations and seat totals.

Why the eligibility deadline and earlier training history matter

A candidate who completed the required B.Sc. must establish that the result was available by 30 November 2026, even though the online form remains available through 6 December. The normal aggregate is 50%, and the 45% concession for eligible SC/ST/PwBD applicants applies only against the reserved-seat conditions that actually exist; code 103 has no notified identified PwBD seats. The original notice also excludes candidates whose prescribed qualification has already completed five years on the reference date and those holding specified higher professional qualifications. These are separate hurdles from age or the relative number of seats.

An applicant who previously trained as an apprentice must disclose the earlier trade and contract status and check the stated minimum gap, if any. First-time trainees receive preference, but an eligible earlier apprentice in a different discipline is not automatically excluded merely because of past participation. Bring the prescribed Annexure-A declaration and supporting records if shortlisted. Document verification and fitness remain prerequisites, so there is no guarantee of entry from academic marks alone.

NAPS plus the second mandatory Barauni form

Use NAPS establishment E11191000001, find the actual Boiler Trade Apprentice code 103 opening, and apply to that opportunity. It is insufficient to create an NAPS profile and stop there. Open the Microsoft Form from the Barauni Refinery 2026–27 (II) entry on IndianOil’s own Apprenticeships page and submit one matching response by 6 December 2026. Retain the enrolment number, email and phone used in both places. Do not submit code 101 as a backup application: the original note says one trade only.

Selection and documentary evidence

The qualifying three-year B.Sc.’s aggregate percentage ranks candidates; no boiler technical CBT or interview is announced. If percentages tie, age and then Matric marks determine the order. A provisional DV list is planned for 11 December, with tentative checks from 14–18 December. Be ready to demonstrate B.Sc. subjects, exact aggregate, declaration of result by the 30 November reckoning date, grade-to-percentage conversion, regular full-time instruction and age/category eligibility through originals. The medical standard is significant because refinery operations and maintenance have hazardous conditions.

Stipend and non-employment warning

The notice does not state a rupee stipend for code 103: Not specified, governed by prevailing rules. No company accommodation or HRA is offered. Holiday/leave and safety measures are subject to the notified apprenticeship terms, and training may be extended only under applicable rules. Completing the two-year Boiler apprenticeship does not guarantee IndianOil appointment.

24-month trade/technician apprenticeship training in refinery operations and maintenance environment as specified generally in the notification; the notice does not list separately promised daily task allocations or permanent job duties for code 103.

Official Barauni Refinery code 103: UR 17, EWS 4, SC 6, ST 1, OBC-NCL 10 = 38. PwBD 0 is an identified horizontal inclusion, never an additional vacancy. Only codes 105 and 107 identify PwBD slots.

Three-year regular full-time Diploma in Mechanical Engineering; eligible recognized lateral-entry diploma permitted. Must be completed by 30-11-2026 from recognized regular full-time course (recognized lateral-entry diploma accepted for 105/107). Min 50% normally, eligible SC/ST/PwBD reserved category 45%. No other unlisted branch, broad equivalence, distance/part-time course, or specified higher professional qualification. For diploma holders, one year or more of job experience after qualification is an express exclusion. Five years elapsed since qualification also excludes.

Required: No · Description: No work experience required; in fact engineering-diploma holders with at least one year of post-qualification employment are ineligible under the notice. Check previous apprenticeship contract and qualification-age exclusions.

Description: SC/ST +5 and OBC-NCL +3 for eligible reserved categories. PwBD +10; further +5 for eligible PwBD-SC/ST and +3 for eligible PwBD-OBC-NCL where applicable. Class X Board document controls DOB. No invented DOB interval.

Code 105 — Technician Apprentice, Mechanical Engineering: 21 seats

A mechanical engineering diploma-specific training opportunity; 12 months at IndianOil Barauni Refinery. The required first application is on NATS, not the trade-apprenticeship NAPS route used by codes 101 and 103. After NATS registration and applying against the actual refinery opportunity, the separate Barauni Microsoft Form is mandatory.

Mechanical Technician reservation — 21 positions in total

Of these 21, five are identified PwBD horizontal positions. This means the figure is 21, not 26. A PwBD claim must match one of the disability categories identified in the notification, supported by a competent-authority certificate, and the candidate must satisfy the pre-engagement refinery medical standard.

Accepted diploma route, and what is not enough

The essential course is a three-year regular full-time Diploma in Mechanical Engineering. A diploma admitted through a properly recognized lateral-entry second-year route after relevant Class XII (Science) or ITI is accepted subject to the course and aggregate-marks rules. The candidate should bring the consolidated qualifying record for all semesters actually undertaken. A B.Sc. in Physics or a B.E./B.Tech is not a free substitute for this prescribed technician-apprentice diploma; the notice also excludes specified higher professional qualifications.

The regular academic aggregate is 50%, relaxed to 45% only for eligible SC/ST/PwBD candidates against their relevant reserved seats. The qualification must have been obtained by 30 November 2026, and the rules barring candidates whose required qualification is five years old are particularly important. The advertisement also expressly excludes a diploma holder with a year or more of job experience after acquiring the qualification. Applicants should evaluate both restrictions separately rather than assuming strong experience improves merit.

Before applying: three Mechanical-specific checks

First: verify your certificate actually says Mechanical Engineering, with qualifying full-time/lateral-entry diploma status and a valid percentage/CGPA conversion. Second: the qualifying diploma must have been completed by 30 November 2026, must not have become five years old under the notice’s rule, and—specifically for diploma holders—post-qualification employment of at least one year is an exclusion. Third: if seeking one of the five identified PwBD horizontal places, confirm that the disability category and competent certificate are suitable under IndianOil’s published refinery requirements. A PwBD candidate applying on an unreserved standard should understand the distinct rules about age and academic-mark concession.

NATS registration and final IndianOil submission

Log in to NATS, choose the actual Barauni Refinery technician opportunity under EBRBEC000003, and apply for code 105. Once successfully applied, submit the additional Barauni Refinery Microsoft Form from the official IndianOil page using the same enrolment ID, registered email and mobile number. Both steps are necessary by 6 December. Do not change the branch or study-mode information merely to match an attractive vacancy.

Merit, documents and offer

IndianOil uses the actual Mechanical diploma aggregate in descending order. There is no recruitment written examination or interview. If percentages tie, older age and then higher Matric percentage resolve the rank. For verification, bring Class X age proof, all diploma term marks, course completion/result publication evidence, regular full-time certificate if sought, conversion certificate, NATS registration and the correct category/PwBD documents, plus Annexure-A where applicable. A provisional list and DV schedule are tentative until officially issued. Refinery medical fitness is a prerequisite for any offer.

The prescribed 12-month apprenticeship has a monthly stipend fixed by the applicable rules, but the exact amount is Not specified in the notification. There is no HRA, accommodation or right to a permanent Mechanical Technician job after completion.

12-month trade/technician apprenticeship training in refinery operations and maintenance environment as specified generally in the notification; the notice does not list separately promised daily task allocations or permanent job duties for code 105.

Official Barauni Refinery code 105: UR 10, EWS 2, SC 3, ST 0, OBC-NCL 6 = 21. PwBD 5 is an identified horizontal inclusion, never an additional vacancy. Only codes 105 and 107 identify PwBD slots.

Three-year regular full-time Diploma in Instrumentation Engineering, Instrumentation & Electronics, Instrumentation & Control Engineering, or Applied Electronics & Instrumentation Engineering; eligible recognized lateral-entry diploma permitted. Must be completed by 30-11-2026 from recognized regular full-time course (recognized lateral-entry diploma accepted for 105/107). Min 50% normally, eligible SC/ST/PwBD reserved category 45%. No other unlisted branch, broad equivalence, distance/part-time course, or specified higher professional qualification. For diploma holders, one year or more of job experience after qualification is an express exclusion. Five years elapsed since qualification also excludes.

Required: No · Description: No work experience required; in fact engineering-diploma holders with at least one year of post-qualification employment are ineligible under the notice. Check previous apprenticeship contract and qualification-age exclusions.

Description: SC/ST +5 and OBC-NCL +3 for eligible reserved categories. PwBD +10; further +5 for eligible PwBD-SC/ST and +3 for eligible PwBD-OBC-NCL where applicable. Class X Board document controls DOB. No invented DOB interval.

Code 107 — Technician Apprentice, Instrumentation: 23 seats

This is a 12-month NATS-based apprenticeship at Barauni Refinery for selected engineering diploma branches in Instrumentation. The notification provides 23 places, of which five are specifically identified as PwBD horizontal positions. IndianOil’s requirements for applying, verifying a valid NATS enrolment and submitting the separate Microsoft Form apply in full.

The Instrumentation reservation table

The five PwBD horizontal positions are within those 23, not extra places. PwBD eligibility turns on the indicated suitable disability types and the required certificate and medical checks. There is no general entitlement to import a vacancy reserved in Mechanical Technician code 105 into the Instrumentation code.

Four diploma titles — check the certificate exactly

1. Instrumentation Engineering
2. Instrumentation & Electronics
3. Instrumentation & Control Engineering
4. Applied Electronics and Instrumentation Engineering

The applicant needs a regular full-time three-year diploma in one of these branches, or a recognized qualifying lateral-entry diploma subject to the notified conditions. The general 50% aggregate applies, with a qualified 45% SC/ST/PwBD concession only against eligible reserved places. Candidates should not assume that a diploma titled only Electronics, Electrical, or Electronic Communication is accepted just because instrumentation equipment may use those technologies. The official advertisement expressly rejects a broad, unnotified equivalence claim.

One more decisive filter: the diploma result must exist by 30 November 2026; passing the course afterwards is insufficient for this cycle. A year or more of professional work after diploma attainment and five years elapsed since acquiring the qualification are separate grounds to check under IndianOil’s stated exclusions. With no written entrance exam, the true competitive input is the official aggregate percentage of the qualifying Instrumentation diploma.

Most common qualification confusion for code 107

The label Instrumentation is not an invitation to any electronics-related qualification. IndianOil prints exactly four degree-of-relatedness choices in the Diploma field: Instrumentation Engineering, Instrumentation & Electronics, Instrumentation & Control Engineering, and Applied Electronics and Instrumentation Engineering. The core credential is the three-year regular full-time diploma, with the specifically accepted recognized lateral-entry route. The general aggregate threshold is 50%, relaxed to 45% only where the reserved-seat SC/ST/PwBD provision actually applies. Any different branch described as “equivalent” is expressly not a safe basis for claiming eligibility.

Check exclusion rules separately: relevant diploma finished by 30 November 2026; no five-year-old qualification under the notice; a year or more of job experience after obtaining the diploma is a separate exclusion; higher professional qualifications and relevant previous apprenticeship-contract restrictions may also bar a candidate. Previous apprenticeship in a different trade can be eligible under specifically notified gaps and affidavit terms; a previous breach-related termination cannot be disguised as eligibility.

NATS, document matching and selection

At NATS establishment EBRBEC000003, apply for the actual Instrumentation Technician Apprentice code 107 opportunity. The second submission is the separate Barauni additional-data Microsoft Form linked by IndianOil, with exactly matching name, NATS ID, email, mobile and course/marks details. Applications close 6 December; no official closing time is stated. The qualifying diploma percentage determines merit, older DOB resolves a tie and Matric percentage resolves a further tie. No separate written assessment is published.

What the offer does and does not include

Medical fitness after original-document verification is required, with relevant disability suitability for the five PwBD horizontal positions. Training is 12 months; stipend amount Not specified in rupees. Apprentices receive the applicable leave/insurance and safety items but not company accommodation or HRA under this advertisement. Successful training does not entitle anyone to permanent employment at Barauni Refinery or an Instrumentation Engineer grade.

12-month trade/technician apprenticeship training in refinery operations and maintenance environment as specified generally in the notification; the notice does not list separately promised daily task allocations or permanent job duties for code 107.

Official Barauni Refinery code 107: UR 11, EWS 2, SC 4, ST 0, OBC-NCL 6 = 23. PwBD 5 is an identified horizontal inclusion, never an additional vacancy. Only codes 105 and 107 identify PwBD slots.