Pass the API ICP Programs API-936 Questions and answers with CertsForce

Pallet

Batch

Testing Procedure

Sample

When a sample fails to meet the required specifications in accordance with API Std 936, any retesting must maintain strict consistency with the original conditions to ensure validity and comparability of results.

API 936 states:

“If a sample fails to meet any requirement, resampling shall be permitted. However, retesting shall be performed using specimens from the same batch, pallet, and sample as the original test. The same testing procedure must be used.”

— API Std 936, Section 6.2.3​

Explanation of Matching Terms:

Pallet: To ensure material consistency.

Batch: Revalidates results without introducing variability from a new production lot.

Testing Procedure: Methodology must not change to avoid skewed comparison.

Sample: Must be the original sample to confirm initial findings.

Therefore, all of these factors must remain the same. The only item in your provided list that is not required to match is “Inspection methods” — it is not part of the retesting condition clause.

According to API TR 980 – Monolithic Refractories: Installation and Dryout, when multiple heat sources are used during refractory dryout, the final approval must come from the Owner:

“If more than one heat source is used, the contractor shall obtain written approval from the Owner for the dryout procedure.”

— API TR 980, Section 6.2.2​

While the contractor may propose or execute the dryout, the responsibility for ensuring its validity and safety—especially when multiple heat sources are involved—rests with the Owner.

API 936 allows for the use oftest panels with enclosed sidesinstead of mesh basketswhen the dimensions exceed 18 in. x 18 in. x 4 in.This substitution provides adequate confinement and stability for larger samples during casting and curing, helping maintain uniformity and representative test integrity.

Wire mesh baskets are typically preferred for smaller, lighter samples, but for larger mock-ups or when vibration is involved, fully enclosed forms prevent edge erosion and deformation during casting and handling.

According to API TR 980, specific practices are required during the installation of erosion-resistant refractory linings:

“Thin-layer linings shall be installed so that overfill is trimmed flush to the hexmetal...”

“Mixing procedures, including mix times and water ratios, shall be defined during material qualification testing…”

“The refractory shall be fully compacted in and around the anchor supports.”

— API TR 980, Section 4.3.2​

Additionally, slicking (Option A) is not permitted as it interferes with mechanical bond development.

Creepin refractories is the slow, time-dependentdeformation of a material under constant stressand high temperature. It is critical in applications like reformers and furnaces where the refractory is under load for extended periods. The amount of deformation is typically measured over 50–100 hours in standardized tests such as ASTM C832.

Creep is not the same as thermal expansion (which is reversible), or cracking (a sudden failure).