Air Entrapment Tee

Air Entrapment Tee & Inspection point

In sewer rising mains (especially sizes >DN350) it is typical to see 'Air Entrapment Tees' installed in locations with high volumes of dissolved air, such as immediately after pump stations.  These comprise of PE spigot tee, with a large flanged PE offtake, typically size on size or one size smaller and include a matching stainless steel flanged blanking plate, with either a threaded outlet or a flanged offtake depending on the connection size.

These tees provide a circular 'catchment area' above the flow path to maximise capture of air bubbles created through pumping operations or changes in pressure where velocities are relatively high and such bubbles may flow past a smaller diameter air valve offtake. The blanking plate includes a smaller diameter threaded or flanged offtake to allow either direct installation of a single air valve onto the blanking plate or to provide a connection point for a PE extension line to allow multiple air valves to be installed at a near location.

This assembly also provides an access and inspection point to launch and retrieve CCTV equipment from. These tees and blanking plates are fully pressure rated.

Air Entrapment Tee / Flanged Offtake / PN10-16 / SDR17-11

Fully pressure rated PE100+ fabricated assembly with long spigot ends for electrofusion on-site. Matched with a 316 Stainless Steel flanged blanking plate and a flanged or threaded reducing outlet for connection to the PE assembly with an O-Ring NBR seal. This fitting can be used for the direct connection of a sewer air valve onto the pipeline or attached to PE flange adaptor and 90º bend, allowing one or more air valves to be located in an alternate location on an air release/intake manifold. 

The matching grade 316 Stainless steel flanged plate resists H2SO4 attack and provides a maintenance-free performance equivalent to the life of the PE pipe. The flange offtake size is configurable in various combinations to suit the application - Refer to the flange blanking plate table below.    

SDR17 PN10 SDR11 PN16 dn1 dn2 L le Z2 Availability in Hong Kong
P5314.C6.250250 P5316.C6.250250 250 250 FL 250 PN16 535 130 273 8-12 weeks
P5314.C6.280250 P5316.C6.280250 280 280 FL 250 PN16 602 139 292 8-12 weeks
P5314.C6.315300 P5316.C6.315300 315 315 FL 300 PN16 650 150 317 8-12 weeks
P5314.C6.355350 P5316.C6.355350 355 355 FL 350 PN16 722 168 376 8-12 weeks
P5314.C6.400400 P5316.C6.400400 400 400 FL 400 PN16 728 145 408 8-12 weeks
P5314.C6.450450 P5316.C6.450450 450 450 FL 450 PN16 890 195 443 8-12 weeks
P5314.C6.500500 Select from the table below 500 500 FL 500 PN16 1036 230 489 8-12 weeks
P5314.C6.560500 Select from the table below 560 560 FL 500 PN16 1085 230 541 8-12 weeks
P5314.C6.630600 Select from the table below 630 630 FL 600 PN16 1175 230 586 8-12 weeks

Note: The above assembly is combined with a 316SS flanged blanking plate selected from the table below. Includes seal and 316 (A4) stainless fastenings.

Air Entrapment Tee / Flanged Offtake / PN10-16 / SDR17-11

As above using fabricated PE tees offering PN16 pressure ratings in larger sizes

SDR17 PN10 SDR11 PN16 dn1 dn2 L le Z1 Z2 Availability in Hong Kong
P5314.44.355350 P5316.44.355350 355 355 FL 350 PN16 1045 300 523 376 8-12 weeks
P5314.44.400400 P5316.44.400400 400 400 FL 400 PN16 1100 300 550 408 8-12 weeks
P5314.44.450450 P5316.44.450450 450 450 FL 450 PN16 1160 300 580 443 8-12 weeks
P5314.44.500500 P5316.44.500500 500 500 FL 500 PN16 1310 350 655 489 8-12 weeks
P5314.44.560500 P5316.44.560500 560 560 FL 500 PN16 1380 350 690 541 8-12 weeks
P5314.44.630600 P5316.44.630600 630 630 FL 600 PN16 1450 350 725 586 8-12 weeks
P5314.44.710700 P5316.44.710700 710 710 FL 700 PN16 1530 350 765 675 8-12 weeks
P5314.44.800800 P5316.44.800800 800 800 FL 800 PN16 1660 350 830 743 8-12 weeks
P5314.44.900900 P5316.44.900900 900 900 FL 900 PN16 1860 400 930 815 8-12 weeks
P5314.44.10001000 P5316.44.10001000 1000 1000 FL 1000 PN16 1960 400 980 886 8-12 weeks
P5314.44.12001200 not available 1200 1200 FL 1200 PN16 2170 400 1085 1044 8-12 weeks

Note:

1. Larger sizes in PN10 available to DN1800

2. The above assembly is combined with a 316SS flanged blanking plate selected from the table below. Includes seal and 316 (A4) stainless fastenings.

Air Entrapment Blanking Flange with Off-take / PN16

Fabricated from 316 Stainless steel complying to BS EN 10088-2 Grade 1.4401 or 1.4404. Both flanges are BS EN 1092-1 rated and drilled PN16 unless indicated as a 'BSP' threaded SS socket for DN 50 offtakes. All Flanges supplied with SS lifting hooks blind threaded into the flange.

Product Code DN1 (Blanking Flange)

DN2 (off-take) Flanged

unless stated as BSP

Z3 Availability in Hong Kong
P09S6.557.25088 250 50 BSP 109 8-12 Weeks
P09S6.G6.250080 250 80 114 8-12 Weeks
P09S6.G6.250100 250 100 126 8-12 Weeks
P09S6.557.30088 300 50 BSP 112 8-12 Weeks
P09S6.G6.300080 300 80 117 8-12 Weeks
P09S6.G6.300100 300 100 129 8-12 Weeks
P09S6.557.35088 350 50 BSP 115 8-12 Weeks
P09S6.G6.350080 350 80 120 8-12 Weeks
P09S6.G6.350100 350 100 132 8-12 Weeks
P09S6.557.40088 400 50 BSP 120 8-12 Weeks
P09S6.G6.400080 400 80 125 8-12 Weeks
P09S6.G6.400100 400 100 137 8-12 Weeks
P09S6.557.45088 450 50 BSP 122 8-12 Weeks
P09S6.G6.450080 450 80 127 8-12 Weeks
P09S6.G6.450100 450 100 139 8-12 Weeks
P09S6.557.50088 500 50 BSP 126 8-12 Weeks
P09S6.G6.500080 500 80 131 8-12 Weeks
P09S6.G6.500100 500 100 143 8-12 Weeks
P09S6.G6.600080 600 80 140 8-12 Weeks
P09S6.G6.600100 600 100 152 8-12 Weeks
P09S6.G6.710080 710 80 148 8-12 Weeks
P09S6.G6.710100 710 100 160 8-12 Weeks
P09S6.G6.710150 710 150 187 8-12 Weeks
P09S6.G6.800080 800 80 159 8-12 Weeks
P09S6.G6.800100 800 100 171 8-12 Weeks
P09S6.G6.800150 800 150 198 8-12 Weeks
P09S6.G6.800200 800 200 210 8-12 Weeks
P09S6.G6.900080 900 80 167 8-12 Weeks
P09S6.G6.900100 900 100 179 8-12 Weeks
P09S6.G6.900150 900 150 206 8-12 Weeks
P09S6.G6.900200 900 200 218 8-12 Weeks
P09S6.G6.1000080 1000 80 175 8-12 Weeks
P09S6.G6.1000100 1000 100 187 8-12 Weeks
P09S6.G6.1000150 1000 150 214 8-12 Weeks
P09S6.G6.1000200 1000 200 226 8-12 Weeks
P09S6.G6.1000250 1000 250 239 8-12 Weeks
P09S6.G6.1200080 1200 80 185 8-12 Weeks
P09S6.G6.1200100 1200 100 197 8-12 Weeks
P09S6.G6.1200150 1200 150 224 8-12 Weeks
P09S6.G6.1200200 1200 200 236 8-12 Weeks
P09S6.G6.1200250 1200 250 249 8-12 Weeks
P09S6.G6.1200300 1200 300 262 8-12 Weeks

Note: The Blanking flange is fabricated to order so any combination of flange and off-take is available, typical combinations are shown above.