Appendices: ( PWC1: Part 1 - Cladding of Gas Pipe & Equipment )

Question 1

an assembly comprising porous insulation material with a metal outer jacket

Answer 1

Cladding

Question 2

Cladding:
Nameplates and stampings on equipment shall be left permanently visible and, If impractical ,,,,,, plate shall be fixed on the outside of the cladding

Answer 2

a second

Question 3

Cladding:
All pipe and equipment which require acoustic cladding shall have been adequately protected against ,,,,,, before cladding starts.

Answer 3

Corrosion

Question 4

Cladding:

During installation, the materials shall be protected with ,,,,, after each day’s application

Answer 4

weatherproof sheeting

Question 5

Insulation materials:

Material to be in contact with the surface being clad shall not cause it to ,,,, under normal site conditions.

Answer 5

corrode

Question 6

Insulation materials:
On stainless surfaces operating above 70 C, the chloride content of the insulation shall not exceed
,,,,,, and should be used in conjunction with a suitable barrier paint which does not contain ,,,, in a metallic form

Answer 6

50ppm

zinc

Question 7

Insulation materials:
On aluminium surfaces other than jacket material, the chloride content of the insulation shall not exceed ,,,,, and the alkalinity shall be in the pH range of ,,,,

Answer 7

25ppm

7 to 8.5

Question 8

Metal jacket material:

Aluminium coated mild steel shall have an aluminium coating which does not contain more than ,,,, % magnesium

Answer 8

6%

Question 9

Insulation banding strip:
banding strip shall be the same material as the ,,,, and
have a minimum width of ,,,,mm. and If self-adhesive tape is used for insulation banding, the tape to shall be with a minimum width of ,,,,,

Answer 9

jacket
12
50mm

Question 10

Mastic sealants:
Mastic sealants shall be suitable for use at temperatures in the range ,,,, oC to ,,,,,, oC with occasional increases up to ,,,,, oC.

Answer 10

–20 oC to 50 oC

80 oC

Question 11

Cladding of pipe:
Pipe shall be covered, as far as possible, with preformed sections of insulation cut and profiled to fit
and secured at ,,,,, intervals with banding strip

Answer 11

450mm

Question 12

Cladding of pipe:

The insulation shall be covered by a ,,,,,

Answer 12

metal jacket

Question 13

Cladding of pipe:

Jacket sheets shall be ,,,,, around the insulation

Answer 13

a snug fit

Question 14

Cladding of pipe:
Jacket sheets shall have minimum ,,, longitudinal and ,,,, circumferential lapped joints which shall be arranged to shed water

Answer 14

25mm

25mm

Question 15

Cladding of pipe:
A clearance of approximately ,,,,,,shall be provided between the jacket and the branch and this annulus shall be filled with ,,,,,

Answer 15

6mm

mastic.

Question 16

Cladding of pipe:

At all flanged joints, the pipe cladding shall be terminated with ,,,,

Answer 16

an end cap

Question 17

Cladding of pipe:

Any part of the outer metal jacket shall not be allowed to come into contact with the ,,,,

Answer 17

pipe wall