Bimed Products Earn UKCA Certification for Continued Service to the UK Market
2026-04-15
The source article states that IEC 60079-31:2022 and NEMA recommend 316L stainless steel for certain explosion-protected equipment, particularly in corrosive chemical and oil-and-gas environments, and predicts wider adoption over the next five years.
Mechanical strength: flameproof enclosures must withstand internal explosion pressure. The article cites an IEC 60079-1 test pressure of at least 1.5 times the reference pressure. The yield strength of a material such as 316L influences resistance to deformation. In the article’s chemical-pipeline example, an elongation of at least 40% is presented as helping avoid brittle failure under methane-explosion conditions.
Corrosion resistance: corrosion can compromise the precision of a flameproof joint. The source gives an Ex d mating-clearance limit of 0.15 mm. The low carbon content of 316L helps resist intergranular corrosion in welded areas exposed to acidic conditions, supporting long-term sealing.
Temperature performance: compared with 316, 316L is described as less susceptible to sensitization at elevated temperatures, such as above 80°C in refining, where chromium-carbide precipitation could impair performance.
ATEX — The article cites an EN 10088-3 intergranular-corrosion test for 316L; a typical application is an offshore platform exposed to seawater and welding.
IECEx — The article cites IEC 60079-0 and at least 500 hours of salt-spray resistance for metal materials; a typical application is a tropical chemical plant.
UL 1203 — The article lists 316/316L and additional coating treatment for corrosive environments, such as North American oil storage tanks.
GB 3836 — The article calls for an intergranular-corrosion report for welded parts under GB/T 4334, using Chinese nuclear facilities as an example.
Additional considerations: the article mentions stress-corrosion-cracking assessment of molybdenum-bearing stainless steel in hydrogen-sulfide environments under ATEX, and a −40°C impact test under GOST certification, where 316L offers good low-temperature toughness.
Raw material: the article’s example prices are USD 2,500 per tonne for 316 and USD 2,800 per tonne for 316L (+12%), reflecting the added complexity of very-low-carbon production.
Welding: the article says 316 requires post-weld solution treatment, while 316L can be welded without subsequent treatment, saving about 20% in labour time.
Service life: the example compares 10–15 years for non-welded 316 with more than 20 years for welded 316L, and claims up to 50% lower maintenance costs.
Certification testing: the example says 316 needs extra corrosion testing, whereas 316L can shorten the certification cycle by around 30%.
Selection error: in the article’s Middle East petrochemical example, a project chose welded 316 glands to save money. After three years, weld corrosion allegedly caused flamepath clearances to exceed limits; remediation cost more than five times the initial purchase price.
Material: the article attributes a 15–20% cost increase to vacuum induction melting used to control carbon content in 316L.
Machining: it cites work hardening, diamond-tool costs about 30% higher and cutting speeds about 40% lower.
Certification: it cites 100,000 thermal cycles and testing costs above USD 5,000 per unit for a SIL 3-certified 316L gland.
Proprietary processes: the article cites a Bimed 316L-plus-nitriding process with a flamepath hardness of HRC 60 and an approximate 25% technology premium.
The article recommends 316L for welded designs such as Ex e cable entries, chloride concentrations above 100 ppm (coastal sites and bleach plants), and frequent temperature cycling from −50°C to +150°C.
It presents 316 as an option for integrally cast Ex d enclosures, non-corrosive inland gas environments and temporary explosion-protected installations.
The broader trend described is increasing use of 316L in corrosive chemical and oil-and-gas applications. Confirm the actual certification, material specification and service conditions for each product before selection.
