4:
Materials of
construction (MOC):
A.
Body
and
wetted
parts:
|
MOC
|
Applications |
Cost |
|
1.
Cast Iron-C.I.
(Galvanized- Rust free) |
1. Water 2. Diesel and oils 3. Effluents 4. Mud 5. Non-corrosive
liquids
|
Low |
|
2.
Polypropylene- P.P
(Moulded)
|
1. Acids and alkalis 2. Corrosive liquids 3. Acidic effluents
|
Medium |
|
3.
Stainless Steel 316
SS316
(Investment cast)
|
1. Food and milk products 2. Pharmaceutical grade use 3. Many
strong chemicals and solvents
|
High |
|
4.
Alloy 20 – A-20
(Investment cast)
|
1. Conc. Sulphuric Acid 98%
|
Higher |
B.
Rubber
parts (Diaphragm and
Flap-Valves):
|
Rubber
(®brand name)
|
Applications |
Cost |
|
1.
Nitrile
(Buna-N) |
Petroleum products, Mild solvents, General use
|
Lower |
|
2.
Chloroprene
(Neoroprene ®)
|
Water, Acids, Abrasive liquids, Mud, Trash |
Low |
|
3.
EPDM
(Nordel ®) |
Alkalis, Hypochlorite, Ketone, Oxidizing chemicals, Aldehydes
|
Low |
|
4.
Hypalon® |
Sulphuric Acid and other acids
|
Medium |
|
5.
Silicone |
Food products, Hot liquids, Milk products,
Vegetable
oils
|
High |
|
6.
Viton®
|
Strong solvents and chemicals, Aromatics
|
Higher |
C.
Note:
For any duty, body and rubber part materials, both must be
suitable
for the liquid.
|
