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Application
The manhole cover is installed on the top of the oil tank truck. It is a functional part for loading, unloading and ventilation. It is equipped with a breather valve and an emergency exhaust valve. In case of emergency, the safety of oil tanker is ensured.
Under normal circumstances, the breather valve is closed, but when refueling, unloading and temperature change, the pressure of the tank truck will also change. At this time, the breather valve will automatically open when the pressure of the oil tank is kept within the specified pressure through air exhaust / suction.
When an emergency is involved, such as a fire accident, the emergency vent valve is opened to automatically release the internal pressure of the oil tank and avoid explosion.
Types 1~4
| Features(Type 1): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes for anti overflow probe rod and oil measuring hole, 5. Cast aluminum alloy. | |
| Parameters(Selecting Order Item): | |
| Item No. | Description |
| WMH03-460 | Outer diameter 460mm, no breathing valve |
| WMH03-460A | Outer diameter 460mm, 1 internal breathing valve |
| WMH03-460B | Outer diameter 460mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN400（16″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 2): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 3 auxiliary holes can be used for oil and gas recovery valve, anti overflow probe rod, oil measuring hole or external breathing valve, 5. 304 stainless steel. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03P-560AF | Outer diameter 560mm, 1 Internal breathing valve, fluororubber seal |
| WMH03P-560AV | Outer diameter 560mm, 1 Internal breathing valve, fluororubber seal |
| WMH03P-580AF | Outer diameter 580mm, 1 Internal breathing valve, fluororubber seal |
| WMH03P-580AV | Outer diameter 580mm, 1 Internal breathing valve, fluororubber seal |
| WMH03P-580EF | Outer diameter 580mm, 1 Internal and external breathing valve, fluororubber seal |
| WMH03P-580EV | Outer diameter 580mm, 1 Internal and external breathing valve, fluororubber seal |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
| Features(Type 3): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes can be used for Oil and gas recovery valve and external breathing valve, 5. 304 stainless steel. | |
| Parameters(Selecting Order Items): | |
| WMH03P-560EFb | Outer diameter 560mm, 1 Internal and external breathing valve, fluororubber seal |
| WMH03P-560EVb | Outer diameter 560mm, 1 Internal and external breathing valve, fluororubber seal |
| WMH03P-580EFb | Outer diameter 580mm, 1 Internal and external breathing valve, fluororubber seal |
| WMH03P-580EVb | Outer diameter 580mm, 1 Internal and external breathing valve, fluororubber seal |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
| Features(Type 4): | |
| 1. Clamped type, 2. 135°Max.opening angle of manhole cover, 3. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod, 4. 304 stainless steel. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03P-530GF100 | Outer diameter 530mm, no breathing valve, fasten with clamp. |
| WMH03P-530AGF100 | Outer diameter 530mm, 1 Internal breathing valve, fasten with clamp. |
| WMH03P-530BGF100 | Outer diameter 530mm, 2 Internal breathing valve, fasten with clamp. |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
Types 5~8
| Features(Type 5): | |
| 1. Quick opening type, 2. single layer 3. 6 fixing points, 4. 180°Max.opening angle of manhole cover, 5. Customized seat ring height, 6. Stainless steel. | |
| Parameters(Selecting Order Items): | |
| WMH03P-510Q6V100 | Fastened with 6 stainless steel threaded handles |
| WMH03P-510Q6V120 | Fastened with 6 stainless steel threaded handles |
| WMH03P-510Q6V150 | Fastened with 6 stainless steel threaded handles |
| WMH03P-510Q6V170 | Fastened with 6 stainless steel threaded handles |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
| Features(Type 6): | |
| 1. Quick opening type, 2. Double layers 3. 9 fixing points, 4. 180°Max.opening angle of manhole cover, 5. Customized seat ring height, 6. Stainless steel. | |
| Parameters(Selecting Order Items): | |
| WMH03P-510K6V100 | Fastened with 9 stainless steel threaded handles |
| WMH03P-510K6V120 | Fastened with 9 stainless steel threaded handles |
| WMH03P-510K6V150 | Fastened with 9 stainless steel threaded handles |
| WMH03P-510K6V170 | Fastened with 9 stainless steel threaded handles |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
| Features(Type 7): | |
| 1. Quick opening type, 2. Singel layer 3. 4 fixing points, 4. 180°Max.opening angle of manhole cover, 5. Customized seat ring height, 6. Stainless steel. | |
| Parameters(Selecting Order Items): | |
| WMH03P-510Q4V100 | Fastened with 4 stainless steel threaded handles |
| WMH03P-510Q4V120 | Fastened with 4 stainless steel threaded handles |
| WMH03P-510Q4V150 | Fastened with 4 stainless steel threaded handles |
| WMH03P-510Q4V170 | Fastened with 4 stainless steel threaded handles |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
| Features(Type 8): | |
| 1. Quick opening type, 2. Single layers 3. 3 fixing points, 4. 180°Max.opening angle of manhole cover, 5. Customized seat ring height, 6. Stainless steel. | |
| Parameters(Selecting Order Items): | |
| WMH03P-360Q3V100 | Fastened with 3 stainless steel threaded handles |
| WMH03P-360Q3V120 | Fastened with 3 stainless steel threaded handles |
| WMH03P-360Q3V150 | Fastened with 3 stainless steel threaded handles |
| WMH03P-360Q3V170 | Fastened with 3 stainless steel threaded handles |
| Technique Specifications: | |
| Nominal diameter: | DN500（14″） |
| Medium: | Dangerous chemicals |
| Operating temperature range: | -40℃ ~ 200℃ |
| Operating temperature range under special working conditions: | -60℃ ~ 250℃ |
Types 9~12
| Features(Type 9): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 3 auxiliary holes can be used for oil and gas recovery valve, anti overflow probe rod and oil measuring hole, 5. Cast aluminum alloy. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03-560 | Outer diameter 560mm, no breathing valve |
| WMH03-560A | Outer diameter 560mm, 1 internal breathing valve |
| WMH03-560B | Outer diameter 560mm, 2 internal breathing valve |
| WMH03-580 | Outer diameter 580mm, no breathing valve |
| WMH03-580A | Outer diameter 580mm, 1 internal breathing valve |
| WMH03-580B | Outer diameter 580mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 10): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes can be used for anti overflow rod and threaded oil and gas recovery valve, 5. Cast aluminum alloy. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03-560Ab | Outer diameter 560mm, 1 internal breathing valve |
| WMH03-560Bb | Outer diameter 560mm, 2 internal breathing valve |
| WMH03-580Ab | Outer diameter 580mm, 1 internal breathing valve |
| WMH03-580Bb | Outer diameter 580mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 14″（350mm） |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 10000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 11): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes can be used for oil and gas recovery valve, anti overflow probe rod and external breathing valve, 5. Cast aluminum alloy. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03-560C | Outer diameter 560mm, 1 external breathing valve |
| WMH03-580C | Outer diameter 580mm, 1 external breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 12): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod, 5. 5083 aluminum alloy plate. | |
| Parameters(Selecting Order Items): | |
| Item No. | Description |
| WMH03L-560A | Outer diameter 560mm, 1 internal breathing valve |
| WMH03L-560B | Outer diameter 560mm, 2 internal breathing valve |
| WMH03L-580A | Outer diameter 580mm, 1 internal breathing valve |
| WMH03L-580B | Outer diameter 580mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | |
Types 13~16
| Features(Type 13): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod, 5. Carbon steel. | |
| Parameters(Selecting Order Items): | |
| WMH03T-580Ab | Outer diameter 580mm, 1 internal breathing valve |
| WMH03T-580Bb | Outer diameter 580mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 14): | |
| 1. Flanged, 2. 24 bolts, 3. 135°Max.opening angle of manhole cover, 4. 3 auxiliary holes can be used for oil and gas recovery valve, anti overflow probe rod, oil measuring hole or external breathing valve, 5. Carbon steel. | |
| Parameters(Selecting Order Items): | |
| WMH03T-580A | Outer diameter 580mm, 1 internal breathing valve |
| WMH03T-580B | Outer diameter 580mm, 2 internal breathing valve |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 15): | |
| 1. Clamped type, 2. 135°Max.opening angle of manhole cover, 3. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod, 4. Carbon steel. | |
| Parameters(Selecting Order Items): | |
| WMH03T-530G100 | Outer diameter 530mm, no breathing valve, fasten with clamp. |
| WMH03T-530G200 | Outer diameter 530mm, no breathing valve, fasten with clamp. |
| WMH03T-530G300 | Outer diameter 530mm, no breathing valve, fasten with clamp. |
| WMH03T-530G370 | Outer diameter 530mm, no breathing valve, fasten with clamp. |
| WMH03T-530AG100 | Outer diameter 530mm, 1 internal breathing valve, fasten with clamp. |
| WMH03T-530AG200 | Outer diameter 530mm, 1 internal breathing valve, fasten with clamp. |
| WMH03T-530AG300 | Outer diameter 530mm, 1 internal breathing valve, fasten with clamp. |
| WMH03T-530AG370 | Outer diameter 530mm, 1 internal breathing valve, fasten with clamp. |
| WMH03T-530BG100 | Outer diameter 530mm, 2 internal breathing valve, fasten with clamp. |
| WMH03T-530BG200 | Outer diameter 530mm, 2 internal breathing valve, fasten with clamp. |
| WMH03T-530BG300 | Outer diameter 530mm, 2 internal breathing valve, fasten with clamp. |
| WMH03T-530BG370 | Outer diameter 530mm, 2 internal breathing valve, fasten with clamp. |
| Technique Specifications: | |
| Nominal diameter: | DN500（20″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
| Features(Type 16): | |
| 1. Clamped type, 2. 135°Max.opening angle of manhole cover, 3. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod, 4. Carbon steel. | |
| Parameters(Selecting Order Items): | |
| WMH03T-430AG76 | Outer diameter 430mm, 1 internal breathing valve, fasten with clamp. |
| WMH03T-430BG76 | Outer diameter 430mm, 2 internal breathing valve, fasten with clamp. |
| Technique Specifications: | |
| Nominal diameter: | DN500（16″） |
| Emergency exhaust diameter: | 10″ |
| Emergency opening pressure: | 21~35KPa |
| Maximum emergency exhaust flow: | 7000m³/h |
| Medium: | Diesel and gasoline |
| Operating temperature range: | -20℃ ~ 50℃ |
| Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
