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FAQs
 

Following are answers to frequently asked questions about First Line pressure vessel products. In case you need any clarifications or have additional inquiries, please feel free to contact us.

Notes:
The information below is specific to First Line pressure vessels.
Specifications are subject to change without notice.

1 What are the different sizes offered by First Line?

  • 2.5
  • 4.0
  • 8.0
  • 16.0

2 What are different types of feed entry options available for the pressure vessels?

Side Entry (Multi port available)
End Entry

3 What is the minimum operating pressure available for the pressure vessels?

75psi

4 What is the maximum operating pressure available for the pressure vessels?

2000psi

5 What is the Design Qualification Pressure for the pressure vessels?

The design is qualified by building a prototype vessel that is subjected to 100,000 cycles over a pressure range of atmospheric pressure to that of the design pressure. Then the prototype vessel that is cycle tested is subjected to hydrostatic qualification test and the prototype vessel has to withstand a pressure not less than SIX times the design pressure.

6 How many membranes can be assembled into one pressure vessel?

1 membrane of 40" /21"€/14"€ length can be assembled into one 2.5-inch pressure vessel.
(For more than 1 membranes please contact your First Line representative)

6 membranes of 40"€ length can be assembled into one 4-inch pressure vessel.
(For more than 6 membranes please contact your First Line representative)

7 membranes of 40"€ length can be assembled into one 8-inch pressure vessel.
(For more than 7 membranes please contact your First Line representative)

7 What are the different sizes of feed concentrate ports available for 2.5” Membrane Housing?

1/4" Rc

1/4" NPT

1/4" BSP

(For other requirements please contact your First Line representative)

8 What are the different sizes of feed concentrate ports available in 4.0

For 300/450psi pressure vessels
     End Port : 1/2 ″NPT F or 3/4 ″NPT F
     Side Port : 1 ″ Grooved

For 600/1000/1200psi pressure vessels
     End Port : 3/4 ″NPT F
     Side Port : 1 ″ Grooved

9 What are the different sizes of feed concentrate ports available for 8” Membrane Housing?

End Entry

    1.5” Grooved End

Side Entry

    1.5” Grooved End

    2.0” Grooved End

    2.5” Grooved End

    3.0” Grooved End

    4.0” Grooved End

(For other requirements please contact your First Line representative)

10 What is the minimum temperature pressure vessel can withstand?

14℉(-10℃)

11 What is the maximum temperature pressure vessel can withstand?

120℉(49℃)

12 Which are the various Quality Certification First Line has?

  ASME "RP"

  NSF

  CE

  SGS

  ISO9001-2008

  Prodcuts of Heilongiang Involving Hygienic Safety of Drinking Water Health Permit

13 What is the pH tolerance range for First Line pressure vessels?

The pH tolerance range is 3 – 11

14 What is the effect on the pH of water after passing through RO membranes?

The pH of water slightly decreases after RO membranes.

15 Why is pre-treatment of raw water necessary in RO?

It is necessary to increase the life of membranes and decrease the operation and maintenance problems.

16 What is the most popular configuration of pre-treatment of RO?

Chlorination – Filtration – Dechlorination – Antiscalant Dosing – Micron Filtration.

17 What is double pass RO?

In double pass RO the two RO systems are used in series. Normally double pass RO is used when high purity of water is desired.