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Mechanical seal system SPA-520

A complete and fully functional Plan 52 system for arrangement 2 (2CW-CW) dual seals in accordance with API 682 or ISO 21049 latest edition – for shaft diameters ≤ 60mm.

These low budget, yet complete and fully functional units are best suited for standard applications. Also for applications with shaft diameters > 60mm, but that requires an exception to the API 682.  

Standard configuration

Design ASME VIII, div. 1/not stamped and/or the European legislation (CE) such as PED 2014/68/EU and the ATEX 2014/34/EU – Zone 2 II/A T1-T3.

Wetted parts AISI 316(L) – Suitable for general oil/water service – Non-hazardous.

Design 40 barg @ -15/+90°C
ANSI 300#-NPS 6” – sch.40s.
Vmin 12 L @ NLL.

Seal supply and return connections ¾” NPT
All further connections ½” NPT
Coolwater connections OD ½”

Engineering units: SI units, Bar/°C.
NDE: Visual-/hydrostatic and leaktesting.
Surface preparation : Flopac std.


Available at request:

Extended NDE packages to include inspections such as X-ray, LPE and P(A)MI.

Refer to the section ‘options’ below.

SPA-520 Configuration


Main components


One piping assembly

An all welded  – stainless steel 316L construction with threaded NPT connections, as appropriate.



The vent, fill and drain connections are provided with a block valve. The fill connection is additionally fitted with provided with a non-return valve, the vent connection with a 3.2mm bore SS 316 restriction orifice. Further appendages as appropriate; 


One pressure indicating transmitter

A 4-20mA Smart/Hart® transmitter of high industrial quality with a 0.2% accuracy, including local display. Wetted parts SS316 with an IP 66 PU coated aluminium housing. Mounted on a SS316 instrument valve.


One level transmitter

A 4-20mA Smart/Hart® Guided Wave Radar (GWR) transmitter of high industrial quality with a 0.5% accuracy, excluding local display. Wetted parts SS316 with an IP 66 PU coated aluminium housing.


One level indicator

A Flopac weld pad level gauge with reflex glass complete with level markings. Wetted parts SS316.


One internal cooling coil

A Flopac high efficiency spiral wound cooling coil fitted inside the reservoir. Nominal capacity 850 Watt.  Wetted parts SS316. Connections OD ½” – tube.



Additional temperature- or flow instruments to enhance monitoring facilities.


Addition of a buffer liquid circulation unit; to ensure circulation and to enhance cooling capacity.


Addition of an all stainless steel 5 ltr refill unit with 75cc/str handpump. (Other refill options available. Note: filling funnels should not be used!)

Contact us


Westelijke Havendijk 15

4703 RA Roosendaal

The Netherlands


+31 (0)165 593 170