# Why are there two accesses in a self-discharge bulk carrier? **URL:** \ **Category:** Naval Architecture\ **Created:** [June 20, 2017, 1:39pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169 "2017-06-20T13:39:24Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![hewenhao](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@hewenhao](https://forum.gcaptain.com/u/hewenhao)\ **Post date:** [June 20, 2017, 1:39pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/1 "2017-06-20T13:39:24Z")
Why are there two accesses in a self-discharge bulk carrier? ![](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex016/uploads/gcaptain_maritime_forum/original/1X/7a63f37362a7e896869c12f724eddaacd0382dab.jpg) ---
**Author:** ![Urs](https://avatars.discourse-cdn.com/v4/letter/u/958977/32.png) [@Urs](https://forum.gcaptain.com/u/Urs)\ **Post date:** [June 20, 2017, 3:35pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/2 "2017-06-20T15:35:43Z")
Because 2 is an even number! Or redraw your sketch with the same dumping angle, but with only one discharge opening… …what will be the resulting, necessary draught of the ship? ---
**Author:** ![SwampGas](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/swampgas/32/397_2.png) [@SwampGas](https://forum.gcaptain.com/u/SwampGas)\ **Post date:** [June 20, 2017, 10:18pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/3 "2017-06-20T22:18:57Z")
Redundancy? They can clog and belts break. ---
**Author:** ![hewenhao](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@hewenhao](https://forum.gcaptain.com/u/hewenhao)\ **Post date:** [October 9, 2018, 12:48pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/4 "2018-10-09T12:48:40Z")
I think it can avoid the block effectively. ---
**Author:** ![dry\_fly](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/dry_fly/32/6570_2.png) [@dry\_fly](https://forum.gcaptain.com/u/dry_fly)\ **Post date:** [October 9, 2018, 1:19pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/5 "2018-10-09T13:19:40Z")
Dual belts…most Lake ships are single belt but some are dual or even 3 belt systems. The issue becomes more gates/rollers/therefore PMs. ---
**Author:** ![Steamer](https://avatars.discourse-cdn.com/v4/letter/s/3d9bf3/32.png) [@Steamer](https://forum.gcaptain.com/u/Steamer)\ **Post date:** [October 9, 2018, 1:27pm UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/6 "2018-10-09T13:27:06Z")
> [@hewenhao](#): > > Why are there two accesses in a self-discharge bulk carrier? Angle of repose. Think about it. ---
**Author:** ![hewenhao](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@hewenhao](https://forum.gcaptain.com/u/hewenhao)\ **Post date:** [November 20, 2018, 11:25am UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/7 "2018-11-20T11:25:45Z")
> [@Steamer](#): > > repose Would you explain it？ Thanks！ ---
**Author:** ![Emrobu](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/emrobu/32/6696_2.png) [@Emrobu](https://forum.gcaptain.com/u/Emrobu)\ **Post date:** [November 20, 2018, 11:37am UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/8 "2018-11-20T11:37:38Z")
granular cargoes have different flow properties. Those that flow easily will have a low angle of repose, that is they will make a big, flat pile when you dump them. Those that flow with more difficulty will have a high angle of repose, a narrow, high pile. So if you have only one belt, the angle of the bottom will be less, and cargoes will not shed into the belt. Or you will have the same angle, and waste volume that could be used for cargo. ---
**Author:** ![hewenhao](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@hewenhao](https://forum.gcaptain.com/u/hewenhao)\ **Post date:** [November 22, 2018, 12:33am UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/9 "2018-11-22T00:33:18Z")
You’re really a smart guy. ---
**Author:** ![jimrr](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/jimrr/32/38358_2.png) [@jimrr](https://forum.gcaptain.com/u/jimrr)\ **Post date:** [November 22, 2018, 2:26am UTC](https://forum.gcaptain.com/t/why-are-there-two-accesses-in-a-self-discharge-bulk-carrier/45169/10 "2018-11-22T02:26:36Z")
re: reprose, it’s in a far side comic, that’s where one learns things like this!