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  2. Safety integrity level - Wikipedia

    en.wikipedia.org/wiki/Safety_integrity_level

    The assignment may be tested using both pragmatic and controllability approaches, applying industry guidance such as the one published by the UK HSE. [3] SIL assignment processes that use the HSE guidance to ratify assignments developed from Risk Matrices have been certified to meet IEC 61508 .

  3. Safety instrumented system - Wikipedia

    en.wikipedia.org/wiki/Safety_instrumented_system

    An SIS performs a safety instrumented function (SIF). The SIS is credited with a certain measure of reliability depending on its safety integrity level (SIL). The required SIL is determined from a quantitative process hazard analysis (PHA), such as a Layers of Protection Analysis (LOPA). The SIL requirements are verified during the design ...

  4. Structural insulated panel - Wikipedia

    en.wikipedia.org/wiki/Structural_insulated_panel

    EPS is the most common of the foams used and has an R-value (thermal resistance) of about 4 °F·ft 2 ·h/Btu (equivalent to about 0.7 K·m 2 /W) per 25 mm thickness, which would give the 3.5 inches (89 mm) of foam in a 4.5-inch-thick (110 mm) panel an R value of 13.8 (caution: extrapolating R-values over thickness may be imprecise due to non ...

  5. Stress intensity factor - Wikipedia

    en.wikipedia.org/wiki/Stress_intensity_factor

    Polar coordinates at the crack tip. In fracture mechanics, the stress intensity factor (K) is used to predict the stress state ("stress intensity") near the tip of a crack or notch caused by a remote load or residual stresses. [1]

  6. Silicon tetrafluoride - Wikipedia

    en.wikipedia.org/wiki/Silicon_tetrafluoride

    Silicon tetrafluoride or tetrafluorosilane is a chemical compound with the formula Si F 4.This colorless gas is notable for having a narrow liquid range: its boiling point is only 4 °C above its melting point.

  7. Cost-plus contract - Wikipedia

    en.wikipedia.org/wiki/Cost-plus_contract

    A cost-plus contract, also termed a cost plus contract, is a contract such that a contractor is paid for all of its allowed expenses, plus additional payment to allow for risk and incentive sharing. [1] Cost-reimbursement contracts contrast with fixed-price contract, in which the contractor is paid a negotiated amount regardless of incurred ...

  8. Cost-plus pricing - Wikipedia

    en.wikipedia.org/wiki/Cost-plus_pricing

    Markup price = (unit cost * markup percentage) Markup price = $450 * 0.12 Markup price = $54 Sales Price = unit cost + markup price. Sales Price= $450 + $54 Sales Price = $504 Ultimately, the $54 markup price is the shop's margin of profit. Cost-plus pricing is common and there are many examples where the margin is transparent to buyers. [4]

  9. Shields parameter - Wikipedia

    en.wikipedia.org/wiki/Shields_parameter

    The Shields parameter, also called the Shields criterion or Shields number, is a nondimensional number used to calculate the initiation of motion of sediment in a fluid flow. It is a dimensionalization of a shear stress , and is typically denoted ψ {\displaystyle \psi } or θ {\displaystyle \theta } .

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