UHDE-STANDARD UN

5222-02 Part 3 (M)

Complementary material

HOLD DOWN GRID Page 1 of 2

[Modified On: 29/08/2008]

© 2008 UHDE INDIA Technical Discipline: MQ

1 Standard requirements for design/ construction In the case of upwards stream flow, the force by weight of the grid in corroded condition must exceed by at least 50 % of the pressure loss of the packing less force by weight of the packing. If the weight force of the hold-down grid is too low, increase thickness of the flat steel members or provide fixing arrangement for the hold-down grid.

1.1 Materials Wire mesh packing: Corrosion-resistant steel (e.g. SS 304) Support grid and connecting elements: see technical specification of vessel

Figure 1.

UHDE-STANDARD September 2004

UN 5222-02

Part 3

Complementary material

HOLD DOWN GRID Page 2 of 2

Free cross section of wire mesh packing (acc. to DIN ISO 4783-1):

• for 0.5 mm wire diameter = 69 %

• for 0.63 mm wire diameter = 64 %

Reference Standards

DIN ISO 4783-1 : 1996-10 Industrial wire screens and woven cloth; Guide to the choice of aperture

size and wire diameter combinations; Generalities

UF V360-21 Part 1 E 01-12

A B C D E F G H I K L UAN : Z-Nr.:

TON :

Designation

Seam-No. Number °C min.

Date Manufacturer

°C max.

Order-No.

Year of construction Work-No.

°C

Vessel sketch with seam-No.

°C

mm mm mm

°C

°C

mm mm mm

°C

°C

mm mm mm

°C

°C

mm mm mm

°C

°C

mm mm mm

°C

°C

mm mm mm

°C

°C Drawing-No. Sheet 1 Rev.

mm mm mm from 2

preheat-inter-

pass temp.

Welding process

Sketch of joint,

seam and preparation

with dimensions

Part-No.

to

part-No.

Material

to

material

Joint

efficiency

Filler metals / make and brand

DIN- or ASME designation

Wire diameter

seal run

Wire diameter

filler passes

Procedure

qualification test

Yet to be done

Examin. of welding

Groove faces

Liq

uid

penetr

. exam

.

Magnetic p

art

ic. exam

.

Ultra

sonic

exam

.

Vis

ual exam

.

Back Exam. root pass before

welding reverse sidechipping

WELDING PROCEDURE AND TESTING SCHEDULE

We reserve all rights relating to this technical documents

Yes No

Liq

uid

penetr

. exam

.

Magnetic p

art

ic. exam

.

Radio

gra

phic

exam

.

Vis

ual exam

.

Procedure

Wire diameter

root pass

A

Seam-No.

UF V360-21 Part 1 E 01-12

M N O P Q R S T

Ultrasonic examination

Method of annealing Dates of annealing Temp. control Longitudinal Transverse

Rate of heating °C / h Work piece Fluid Pressure

Holding temperature °C bar

Holding time Min. Furnace Pressure Holding time

Rate of cooling °C / h bar Min.

°C / h AD-Merkblatt

°C ASME Code

Min.

°C / h

°C / h Special remarks :

°C

Min.

°C / h

°C / h

°C

Min. Symbols in the testing schedule

°C / h Inspector

°C / h

°C

Min.

°C / h

°C / h

°C

Min.

°C

°C / h

°C

Min.

°C

°C / h

°C

Min. Drawing-No. Sheet 2 Rev.

°C from 2

Furn

ace

Induction h

eating

Resis

tance h

eating

Insid

e

Insid

e

Ou

tsid

e

Radiographic -

examination

Ou

tsid

e

Ou

tsid

e

Ou

tsid

e

Rad

iog

rap

hic

exam

inati

on

Remarks

special tests

Leakage

test

Pressure

test

Insid

e

Insid

e

Liquid penetrant

examination

Magnetic

particle

examination

Heat treatment (PWHT)

Each test to be confirmed by the inspector by placing his

initials and data next to the test symbol

Inspections standard

Test scope

100%

25%

Ult

raso

nic

exam

inati

on

Insp

ecti

on

co

mp

.

Man

ufa

ctu

rer

UH

DE

Liq

uid

pen

etr

an

t exam

inati

on

Random incl. cross section

After PWHT

After pressure test

Mag

neti

c p

art

icle

exam

inati

on

We reserve all rights relating to this technical documents

WELDING PROCEDURE AND TESTING SCHEDULE