LS 137-02 T1

Issue 03.2007
Inspection check list
Linde AG
Linde Engineering
Orig.: TAW/Zenner
Pressure vessels
Checked: TAW/Körner
Appr.: TAW-N/Thomas
LS 137-02
Part 1
Page 1 of 2
Replaces Issue 04.97
Insp. Report No.:
Item No.:
Table 1: General Activities
No. Inspection Activity
1 Ensure approved drawings, WPS and PQR/WPQR and Welding and Testing Plan are
available in the workshop.
2 Review material test reports / inspection certificates. Verify chemical composition, state of
delivery, mechanical test results etc.
3 Check of traceability to vessel parts.
4 Verify welding edge preparation.
5 General workmanship quality.
6 Ensure welders are qualified.
7 Check handling of welding consumables: Storage, re-baking of flux/electrodes,
8 Witness welding performance. Verify application of WPS and control of pre-heating and
used filler metals.
9 Inspect weld joints: Location of welds, weld profile (e.g. misalignement, peaking /
banding), welder's stamp.
10 Dimensional check of Pressure Vessel: lengths, diameter / out of roundness, distance
between associated nozzles.
11 Check of wall thickness of main components (shell courses, heads, special forgings,
piping, skirt).
12 Check of nozzles: location, pipe dimensions, reinforcement, stiffeners, welding bevels.
13 Check flanges: flange type, DN or NPS, PN or class, facing, bolting.
14 Check internals: location, dimensions, attachment welds.
15 Check externals, i.e.clips, brackets, lifting lugs, location, dimensions, attachment welds.
16 Check vessel north and measurement markings (i.e. by notches).
17 Evaluate radiographic films including traceability to welds; check weld repairs.
18 Ensure NDE extent is fulfilled. Review NDE reports: VT, RT, UT, PT, MT.
19 UT zero point check.
20 Review hardness test reports.
21 Review production test plate reports.
22 Review of other tests, e.g. ferrite number, "Positive Material Identification" (PMI / AV).
23 Review post-weld heat treatment and stress relieving records, time-temperature charts.
24 Check vessel nameplate: location, data, code compliance.
25 Witness leak testing i.e. on reinforcement pads.
26 Witness pressure testing.
27 Check applied torque values on bolted connections.
28 Check cleanliness and surface treatment, i.e. pickling and passivation, sand-blasting.
29 Check painting/coating: type of coat, film thickness, bonding strength.
30 Check refractory (castable or bricks): soundness, shape, thickness.
31 Review final "Manufacturer's Data Report" (vessel data book).
32 Review and / or signing of "Fabrication and Inspection Plan" / "Quality Control Plan".
33 Verify completeness of loose delivered items, i.e. gaskets, bolts, foundation ring, internals
34 Check closure of openings and tell-tale holes, N2 filling, shipment supports, marking.
35 Check transport saddles: dimensions, distance to external attachments.
Note: Reports shall be properly prepared by manufacturer.
Linde AG - Linde Engineering Division
Issue 03.2007
LS 137-02 Part 1
Page 2 of 2
Table 2: Supplementary Activities for Dryers, Filters, Separators, Spray Coolers
No. Inspection Activity
50 Check support grid construction: gap between support ring and support grid, dimensions,
flatness, welds.
51 Check sealing between support ring and support grid.
52 Check weir: overflow height, stiffeners, tightness.
53 Check diameter and height of riser pipes.
54 Check internal bolting, i.e. for gratings, manway covers, screen baskets: material and lock
fastening (spring washer, double nut, tack welding).
55 Check wire meshing: mesh type and compactness, tightness to boundary shell.
56 Check that internal parts i.e. gratings / covers can be easily dismantled and handled.
57 Check for leaks on bolted connections where "fluid tight" condition is specified.
58 Check internal piping: NPS, flange connections, gaskets, supports (to allow free
59 Check perforated plates: material, thickness, hole pitch.
60 Check vortex breaker: material and dimensions.
61 Check impingement plates: material and dimensions.
62 Check correct installation of filter elements: support, bolting, support for transport.
63 Check spare parts: filter elements, spray nozzles, etc.
Note: Reports shall be properly prepared by manufacturer.
Revision: Totally revised
Previous Issues: LS 137-02 (04.97)
Replaces: LS 137-01 (10.90); LS 137-6 (08.81); LS 137-7 (08.81); LS 137-24 (08.81)
Responsible department for the technical content: TAW
LS-Class 1: Unrestricted publication
Refer to protection notice ISO 16016