Valves for Refinery & Petrochemical Process

EIL (Engineers India Limited) maintains a vendor approval list for valves used in IOCL, BPCL, HPCL, and other PSU refineries. Approved vendors must meet EIL's SLMV (Specification for Low-Medium Voltage) and SPC (Specification for Piping Components) requirements. Valves must comply with EIL piping specifications including SPC-044 (Gate Valve), SPC-045 (Globe Valve), SPC-046 (Check Valve), and SPC-047 (Ball Valve). Vajra works with EIL-approved valve manufacturers and can supply valves with EIL inspection.

IBR (Indian Boiler Regulations) certification is required under the Indian Boilers Act for valves installed on boilers and steam-generating plant, and for all steam pipelines at pressures above 3.5 kg/cm² (0.35 MPa). For refinery steam service, IBR Form III-C (raw material certificate) and Form III-E (test certificate) must be supplied with the valve. Vajra supplies IBR-certified gate, globe, globe-check, and safety relief valves for refinery steam service.

ISO 15848 specifies factory acceptance test procedures for measuring and qualifying the fugitive emission performance of industrial valves (i.e., how much fluid leaks past the stem packing or bonnet joint to atmosphere). Class A (tightest), B, and C are defined. Fugitive emission-compliant valves are required for VOC (volatile organic compound) containing streams in refineries to comply with MARPOL, CPCB, and EPA fugitive emission regulations. Typical service: benzene lines (Class A), H₂S service (Class A or B), general HC lines (Class B).

PWHT (Post-Weld Heat Treatment) is a heat treatment applied to welded joints in pressure vessels and piping to relieve residual stresses introduced during welding. PWHT is required per ASME B31.3 / ASME VIII for carbon steel welds above a certain wall thickness (typically >19mm for P-1 materials) and for alloy steels (Cr-Mo, P91). For amine service valves (DEA, MDEA), PWHT is mandatory on all welds to prevent amine stress corrosion cracking regardless of wall thickness.