<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:6878d315-8922-4abf-ae9b-036dcf0ed104,g:14ff6aea-2232-4b0c-afa0-e925d74fe7c9-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.paalp.com/role/CoverPage" xlink:type="simple" xlink:href="pagp-20211005.xsd#CoverPage"/>
  <link:presentationLink xlink:role="http://www.paalp.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_9123e827-627d-4be7-b267-df6d84012eca" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_DocumentType_9123e827-627d-4be7-b267-df6d84012eca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_afab8eba-d1d3-4005-8498-2b7701a10869" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_DocumentPeriodEndDate_afab8eba-d1d3-4005-8498-2b7701a10869" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_a51b2d43-4b2a-4403-8691-f8733279cfd9" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityRegistrantName_a51b2d43-4b2a-4403-8691-f8733279cfd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_3c516038-2c1d-4741-b1fa-c2fd5edec522" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityIncorporationStateCountryCode_3c516038-2c1d-4741-b1fa-c2fd5edec522" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_f835d014-e091-4cb6-b1b7-58b3dc0c0d6f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityFileNumber_f835d014-e091-4cb6-b1b7-58b3dc0c0d6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_c7dee00b-97dd-4fcf-8578-e76bf9468627" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityTaxIdentificationNumber_c7dee00b-97dd-4fcf-8578-e76bf9468627" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_798c25ce-1893-4fea-9de9-0f034507d5b8" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityAddressAddressLine1_798c25ce-1893-4fea-9de9-0f034507d5b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_586cd9a3-4117-47d6-b523-4ef8ba310306" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityAddressAddressLine2_586cd9a3-4117-47d6-b523-4ef8ba310306" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_0e376de4-2eab-4b18-bb6e-660b53650408" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityAddressCityOrTown_0e376de4-2eab-4b18-bb6e-660b53650408" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_61d3f43a-2495-4618-b0d9-8a606239bb54" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityAddressStateOrProvince_61d3f43a-2495-4618-b0d9-8a606239bb54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_4ad65229-dd07-4187-89b7-b123113319d2" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityAddressPostalZipCode_4ad65229-dd07-4187-89b7-b123113319d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_c6b11fce-bb2c-43a3-b2d4-46a8310329c8" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_CityAreaCode_c6b11fce-bb2c-43a3-b2d4-46a8310329c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_a962f377-db7a-4842-ad1d-62eba285544c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_LocalPhoneNumber_a962f377-db7a-4842-ad1d-62eba285544c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_263679bf-bb26-48eb-9a73-db60bc5bb9eb" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_WrittenCommunications_263679bf-bb26-48eb-9a73-db60bc5bb9eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_b1550ac8-bbed-42c4-9d2b-c07b23fe8563" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_SolicitingMaterial_b1550ac8-bbed-42c4-9d2b-c07b23fe8563" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_dd93a4ec-7409-489b-8e77-5579470097d6" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_PreCommencementTenderOffer_dd93a4ec-7409-489b-8e77-5579470097d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_bae14f06-6869-4175-bd3c-9af6bde7871e" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_bae14f06-6869-4175-bd3c-9af6bde7871e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_102380b5-9ad2-4bc5-9ce3-49dece55b923" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityEmergingGrowthCompany_102380b5-9ad2-4bc5-9ce3-49dece55b923" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_52bf1ec7-a8e1-407d-b7fc-2acbd6731cc5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_Security12bTitle_52bf1ec7-a8e1-407d-b7fc-2acbd6731cc5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_a5e9860e-52f0-4037-bad8-04a35984f46b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_TradingSymbol_a5e9860e-52f0-4037-bad8-04a35984f46b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_f89d3be7-927a-4f36-b83f-fa5612e74f44" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_SecurityExchangeName_f89d3be7-927a-4f36-b83f-fa5612e74f44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_7e210e0d-4e07-4db6-ad3c-8e7a4a87bdf8" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_EntityCentralIndexKey_7e210e0d-4e07-4db6-ad3c-8e7a4a87bdf8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_41fb1e2d-7f8b-45ba-bd85-a434726e3173" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_AmendmentFlag_41fb1e2d-7f8b-45ba-bd85-a434726e3173" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentDescription_14de3956-6f2f-4f98-9102-c6b627000563" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentDescription"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_803f5e2f-33d2-4fff-8011-0b7a2d5174dd" xlink:to="loc_dei_AmendmentDescription_14de3956-6f2f-4f98-9102-c6b627000563" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
