SPED Pipe Fabrication & Welding Standards 2

Question 1

According to ASME B31.3, what is the minimum preheat temperature required for P-No. 1 carbon steel pipe with a wall thickness exceeding 1 inch?

Accepted Answer

175°F (79°C)

Answer

ASME B31.3 Table 331.1.1 requires a minimum preheat of 175°F for P-No. 1 steels when the nominal wall thickness exceeds 1 inch.

Question 2

Which NDE method is most effective for detecting subsurface volumetric defects such as porosity and inclusions in a weld?

Accepted Answer

Radiographic testing (RT)

Answer

Radiographic testing uses X-ray or gamma-ray radiation to reveal volumetric internal defects like porosity and slag inclusions throughout the weld cross-section.

Question 3

In pipe fabrication, what does the term 'fit-up' refer to?

Accepted Answer

The alignment and gap preparation of pipe ends before welding

Answer

Fit-up is the preparation step where pipe ends are aligned, gapped, and tacked in position to ensure proper joint geometry before the root pass is deposited.

Question 4

What is the primary purpose of a Procedure Qualification Record (PQR) in welding?

Accepted Answer

To record the actual test variables used to qualify a Welding Procedure Specification

Answer

A PQR is a record of the welding data and test results from the coupon tests used to qualify a WPS, as required by ASME Section IX.

Question 5

Under ASME B16.25, which end preparation is considered a standard butt-welding end for pipe nominal sizes 2½ inches and larger with wall thicknesses up to 0.88 inches?

Accepted Answer

Single-V groove at 37.5°

Answer

ASME B16.25 specifies a single-V bevel at 37.5° (±2.5°) from the pipe axis as the standard butt-welding end prep for the specified size and thickness range.

(SPED) Society of Piping Engineers and Designers Certification Practice Test

(SPED) Society of Piping Engineers and Designers Certification Practice Test

SPED Pipe Fabrication & Welding Standards 2