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  Products & Services   »  Sanitary   »  Alfa Laval   »  Tank Equipment

Circular Type HLSD

On Top of your pressure Tank
Circular Type HLSDAccess Tank Cover -
HLSD, Manhole Cover.

Application

Outward opening manway cover type HLSD is used on top of pressurized tanks and containers where closeable means of access to the interior of the vessel is required. HLSD is approved by the German TV authority, the European Pressure Directive (PED), the Danish A.T. and the Dutch Stoomwezen for pressures up to 145 PSI (10 bar).

Working principle

HLSD is secured in the closed position by spring-loaded swingbolts, which, together with the seal in the cover, ensure complete tightness. The cover is attached to the frame by a rigid hinge, giving exact location of the cover in the closed position and designed to stop the cover at an angle of 30 beyond the vertical position when opening.

Standard design

HLSD has from 4 up to 18 swingbolts subject to the size, pressure and temperature. The seal between cover and frame is located in the cover.

Materials

Note! Weldings are not treated.

Product wetted steel parts: W. No. 1.4404 (AISI 316L), supplied with inspection certificate 3.1.B according to EN10204
Other steel parts: W. No. 1.4301 (AISI 304)
Seal: EPDM (14 F to 284 F).
Finish: Semi-bright.

Sizes

Internal diameters of frame: 8", 12", 16", 18", 20", 24" and 32"

Technical Data

Working pressure: Up to 145 PSI (10 bar), 7.87"
Negative working pressure: Full vacuum.
Test pressure: Max. 1.3 x working pressure.
Temperature range: 14 F to 428 F

Options

  • - Spring to assist opening.
  • - Arrangement for securing cover in open and closed position.
  • - Bracket for indication unit.
  • - Handle in stainless steel.
  • - Guide for cover for vertical installation.
  • - Sight glass acc. to DIN 28120.
  • - Union sight glass based on DIN 11851.
  • - Safety grid.
  • - Special surface finish.
  • - Different frame heights (up to 800 mm / 31 inch).

Material grades

  • - Seal of Q (silicone), NBR (nitrile).
  • - Seal of FPM or FEP covered Q.

Note!Extra screws required (see table 1.b.).

Ordering

Please state the following when ordering:

  • - Size.
  • - Max. pressure and corresponding temperature.
  • - Max. temperature and corresponding pressure.
  • - Optional extras.

Selection Table

Table 1.a.
Size (in.) A (in.) No. of Screws Working pressure (PSI) SL (in.)
Weight (lb.)
at working temperature ( F )
122 212 302 392 482
7.9 8.11 4 145 145 145 145 145 0.12 33
11.8 12.0 5 116 116 102 102 116 0.12 44
15.7 16.0 5 73 58 58 58 58 0.16 55
15.7 16.0 7 102 87 87 87 87 0.16 60
17.7 17.9 5 58 44 44 44 44 0.16 62
17.7 17.9 7 87 73 73 73 58 0.16 66
17.7 17.9 9 102 87 87 87 87 0.16 71
19.7 19.9 5 44 44 44 29 29 0.16 68
19.7 19.9 7 73 58 58 58 44 0.16 73
19.7 19.9 9 87 73 73 73 73 0.16 77
19.7 19.9 11 102 87 87 87 87 0.16/0.20 82
23.6 23.9 8 58 44 44 44 44 0.16 97
23.6 23.9 10 73 58 58 58 44 0.16 101
23.6 23.9 12 87 73 73 65 65 0.20/0.24 108
31.5 31.8 10 29 29 29 29 29 0.24 117
31.5 31.8 13 44 44 44 44 29 0.24 150
31.5 31.8 16 58 58 55 53 50 0.24 172

Selection table for seals of FPM or FEP covered Q.

Table 1.b
Size (in)
Min. number of screws
8 4
16 6
20 8
32 12

Fig. 2. Dimensions.

Dimensions (in.)

Size 8 12 16 18 20 24 32
A 8.11 12.1 16.0 18.0 19.9 23.9 31.8
1
C 13.8 17.7 21.7 23.6 25.6 29.5 37.4
F 5.31 5.31 5.31 5.31 5.31 5.31 5.31
H 10.2 10.8 11.4 11.8 12.0 12.4 12.6
SL See table 1. a.

 

 

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