Printed 2022.8

Proposal for pipe
deterioration diagnosis

Outdoor piping

Chemical process piping

Do you have any problems
about the deteriorationof industrial piping in the factory?
SEKISUI CHEMICAL CO., LTD. conducts deterioration diagnosis
based on the optimum method according to the piping situation.

Deterioration of PVC piping is foundin various ways.
Deteriorations from the outside

Bleaching

Tanning

Bulging

Deteriorations from the inside

Exudation

BleachingBlister

Tanning

CracksCracksBlisterThickness reduction

Outdoor piping (UV degradation)
Regular PVC

HHHHHHCCCCCCUV

Double-Bonded PVC
H

HCC

Cl H Cl H Cl H

H

H

H

HCCCCUVPolyene PVC

H

H

H

H

H

H

CCCCCCCl H Cl H

Loss ofHCl hydrochloric
acidElectron micrograph (10,000x)

H

H

CC

Molecular chain
disconnected(Lower molecular weight)

Cl H

HClHClVoid・concave shape

Polyene generation

Irregular light reﬂections

Light absorption

Bleaching

Tanning

Increased brittleness

Break

Chemical piping（Chemical degradation ）VP管（JISVP Pipe
(JISK6741）
K 6741)(PVC pipe)

HI管（JIS K6742）
HI Pipe(JISK 6742)(High impact resistance PVC pipe)

HT管（JIS K6776）
HTPipe(JISK 6776)(Heat-resistantCPVC pipe)
NaOH25%×40℃×約6年

Hydrochloric acid 35%
× At normal temperature × About 6 years

Sulfuric acid 90%
× At normal temperature× About 3 years

Sodium hydroxide 25%
×40ºC×About 6 years

Penetration
内面からfromthe innersurface to the
外面への浸透outer surface

Innersurface
内面の酸化HCl塩 酸

H2硫SO酸4

表 面Decline
エ ネ ルofギ ーsurface
energy低下

oxidation

Stress応 力［2.6mm］[2.6mm]［3.3mm］[3.3mm]Exudation

BlisterStress
応 力NaOH
NaO H
CracksAged piping can cause business loss and employee safety due to various troubles.
Furthermore, in recent years, due to the growing social responsibility of companies, measuresagainst aging pipes have been highlighted.
Please use our deterioration diagnosis, which is a top manufacturer of PVC piping in Japan, toquickly detect deterioration of piping, predict risks, and preventive maintenance.

UV deterioration diagnosis for outdoor piping

No need extubation because of scraping the surface layer.
Diagnosis method①Scrape off the surface layer. ②Send sample back to labo.
Required sample amount
Length：30 mm or more
Width：3 mm or more
Number：3 or more

* About 5mg

Diagnosable pipe type : PVC pipe

Deterioration diagnosis method
Surface deterioration degree measurement

Estimating strength reduction

Measuring the rate of change in thechemical structure of the surface layer
due to ultraviolet rays

Estimate the decrease in strength fromour database of the surface deterioration
degreeDiagnosis*Level

Degraded conditions

ABC

No chemical deterioration requiring
renewal consideration.
It is estimated that the strength has decreased.
We recommend that you consider renewal within ● years.
It is estimated that the strength has significantly decreased.
We recommend early renewal consideration.

* Diagnosis is the result of the judgment based on our indicators based on theperformance of the piping that has been removed and evaluated, and it is
not intended to evaluate or guarantee the deterioration status and quality ofthe existing piping as a whole.

Deterioration diagnosis method

1

2

3

4

Meeting,
Cost estimation

Send sample
back to our lab.

Analysing,Diagnosing

Reporting*Diagnosis fee is charged

Chemical deterioration diagnosis for chemical piping

Extubation is needed , because of testing up to 7 tests.
Diagnosis method
Please pull out the pipe of the specified length and send it to our labo.

Diagnosable pipe type
Polyvinyl chloride pipes, High impact resistance Polyvinyl chloride pipes,
Heat-resistant C-PVC pipes, PVC pipes reinforced with FRP* 〜300A（Please contact us for the pipe types and size ）Required sample length

Deterioration diagnosis method
Sample preparation
Cut out to the specified
dimensions according to thetest item

13〜40A ：700mm or more
50〜300A ： 500 mm or more

Testing based on Official standards
Test items
1Tensile yield strength

2Elongation at break3

Flattingpipe

4

Impact test

Cut out from pipe

5Wall thicknesses measurement

6

Observation of inner surface

7

Observation of cross-section

Diagnosis*

Comprehensive judgment by our database

Level

Degraded conditions

ALittle deterioration or deterioration ofperformance.

B

Slight deterioration or deteriorationof performance. Rediagnosis within
3 years is recommended.

CDDeterioration or deterioration ofperformance. It is recommended thatthe renewal be within two years.
Marked deterioration or deterioration ofperformance. We recommend early
updates for safety.

* The result of the deterioration level is the result of the judgment based on
our indicators based on the performance of the piping that has been removed
and evaluated, and it is not intended to evaluate or guarantee thedeterioration status and quality of the existing piping as a whole.

※ The properties are for reference purpose only and are not guaranteed.

For UV resistance

ESLON™ UVS-VP 20-200A(CB-200003-A) ※DV fittings are not covered■ Outer layer coated with UV resistant weatherproofed plastic achieves high weather resistance for outdoor use.
After weatherproof test

● Weatherproof test (Impact strength)
400
350
UVS-VP300
PVC Pipe(VP)
250
Strengthned PVC Pipe(HI)
200
150
100
50
050% Crack height(cm)

VP pipeUVS-VP

Outer Layer:Highly weatherized plastic

Inner Layer:PVC plastic

0510152025
Equivalent years of outdoor exposure (years)■ Approximately 20% cost reduction compared to Normal VP pipes with painting. (estimate at 50A)
■ It is possible to suppress the deterioration of physical properties due to ultraviolet rays and extend the life.

For Chemical resistance

ESLON™ PLANT VP PIPE 16-300A

JIS K 6741

PLANT VP pipe is specialized for chemicals, achieving an optimal composition that is highly resistant against corrosion and impact.
■ Impact strength

Permeation test by hydrochloric acid

[cm]
400

Exudation(After 26 days)

0.50mm/div

0.50mm/div

Normal PVC pipe

PLANT VP pipe

Drop Weight Impact Test
50% Crack height■ Permeation in pipes with hydrochloric
acid is dramatically suppressed.

Impact resistance complies with that of HIVP pipe
(impact resistant PVC pipe).

300200HI Pipestandards

1003kg-Flat
Shape
Plant VP Pipe

Normal PVC Pipe

No exudation of hydrochloric acid (After 360 days)<Test method> Diameter Size: 50A, Weight: 3kg
flat shape, Temperature: 0°C

For Pressure & Heat resistance

ESLON™ VPFW・HTFWESLON™ Sch80 PVC & CPVC
piping systems
15-400(600)A■ The outside of the PVC pipe is reinforced with FRP,
making for a highly pressure andheat resistant pipe.

■ Industrial thick pipe that complies withthe American ASTM
standard.

VPFW(16-600A)

HTFW(16-300A)

SEKISUI CHEMICAL CO.,LTD. Industrial Piping Systems Division
2-10-4 Toranomon Minatoku,Tokyo,105-8566 Japan
TEL +81-3-6748-6489 FAX +81-3-6748-6553
https://eslon-plant.jp/web-en/ E-mail: eslon_plant@sekisui.com
SEKISUI INDUSTRIAL PIPING CO., LTD.
5F., No.156, Sec.1, Zhongshan Rd., Banqiao Dist.,
New Taipei City 22065, Taiwan (R.O.C.)
TEL：+886-2-2964-1478 FAX：+886-2-2964-1959
SEKISUI (SHANGHAI) INTERNATIONAL
TRADING CO., LTD.
Room 706, Metro Tower, No.30, Tianyaoqiao RoadShanghai. 200030, China
TEL +86-21-6482-0638 FAX +86-21-6482-0639
SEKISUI SINGAPORE PTE, LTD.
7500A Beach Road #12-306 The Plaza, Singapore 199591
TEL +65-6296-3788 FAX +65-6296-7723

SEKISUI CHEMICAL GmbH
Rossstrasse 92, 40476 Duesseldorf, Germany
TEL +49-211-36977-0 FAX +49-211-36977-31

Printed Aug. 2022

SEKISUI VIETNAM CO., LTD.
Room1414, CornerStone Building,
16Phan Chu Trinh St,
Hoan Kiem District, Hanoi, Vietnam
TEL +84-4-3939-2677 FAX +84-4-3939-2678

Proposal for pipe deterioration diagnosis
Pamphlet

SEKISUI CHEMICAL CO.,LTD.
Industrial Piping System Division

No. 06217
2022. 8. 0TH TX