diff --git a/tempest/api/volume/admin/test_multi_backend.py b/tempest/api/volume/admin/test_multi_backend.py
index db2aab5..6f2ee06 100644
--- a/tempest/api/volume/admin/test_multi_backend.py
+++ b/tempest/api/volume/admin/test_multi_backend.py
@@ -60,7 +60,7 @@
             extra_specs = {spec_key_with_prefix: backend_name_key}
         else:
             extra_specs = {spec_key_without_prefix: backend_name_key}
-        _, self.type = self.client.create_volume_type(
+        _, self.type = self.volume_types_client.create_volume_type(
             type_name, extra_specs=extra_specs)
         self.volume_type_id_list.append(self.type['id'])
 
@@ -90,7 +90,7 @@
         # volume types deletion
         volume_type_id_list = getattr(cls, 'volume_type_id_list', [])
         for volume_type_id in volume_type_id_list:
-            cls.client.delete_volume_type(volume_type_id)
+            cls.volume_types_client.delete_volume_type(volume_type_id)
 
         super(VolumeMultiBackendTest, cls).resource_cleanup()
 
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index 070d38f..a0792f1 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -29,12 +29,12 @@
         self.volumes_client.wait_for_resource_deletion(volume_id)
 
     def _delete_volume_type(self, volume_type_id):
-        self.client.delete_volume_type(volume_type_id)
+        self.volume_types_client.delete_volume_type(volume_type_id)
 
     @test.attr(type='smoke')
     def test_volume_type_list(self):
         # List Volume types.
-        _, body = self.client.list_volume_types()
+        _, body = self.volume_types_client.list_volume_types()
         self.assertIsInstance(body, list)
 
     @test.attr(type='smoke')
@@ -48,7 +48,7 @@
         extra_specs = {"storage_protocol": proto,
                        "vendor_name": vendor}
         body = {}
-        _, body = self.client.create_volume_type(
+        _, body = self.volume_types_client.create_volume_type(
             vol_type_name,
             extra_specs=extra_specs)
         self.assertIn('id', body)
@@ -87,7 +87,7 @@
         vendor = CONF.volume.vendor_name
         extra_specs = {"storage_protocol": proto,
                        "vendor_name": vendor}
-        _, body = self.client.create_volume_type(
+        _, body = self.volume_types_client.create_volume_type(
             name,
             extra_specs=extra_specs)
         self.assertIn('id', body)
@@ -98,7 +98,8 @@
                          "to the requested name")
         self.assertTrue(body['id'] is not None,
                         "Field volume_type id is empty or not found.")
-        _, fetched_volume_type = self.client.get_volume_type(body['id'])
+        _, fetched_volume_type = self.volume_types_client.get_volume_type(
+            body['id'])
         self.assertEqual(name, fetched_volume_type['name'],
                          'The fetched Volume_type is different '
                          'from the created Volume_type')
@@ -115,11 +116,11 @@
         provider = "LuksEncryptor"
         control_location = "front-end"
         name = data_utils.rand_name("volume-type-")
-        _, body = self.client.create_volume_type(name)
+        _, body = self.volume_types_client.create_volume_type(name)
         self.addCleanup(self._delete_volume_type, body['id'])
 
         # Create encryption type
-        _, encryption_type = self.client.create_encryption_type(
+        _, encryption_type = self.volume_types_client.create_encryption_type(
             body['id'], provider=provider,
             control_location=control_location)
         self.assertIn('volume_type_id', encryption_type)
@@ -131,8 +132,9 @@
                          "equal to the requested control_location")
 
         # Get encryption type
-        _, fetched_encryption_type = self.client.get_encryption_type(
-            encryption_type['volume_type_id'])
+        _, fetched_encryption_type = (
+            self.volume_types_client.get_encryption_type(
+                encryption_type['volume_type_id']))
         self.assertEqual(provider,
                          fetched_encryption_type['provider'],
                          'The fetched encryption_type provider is different '
@@ -143,11 +145,12 @@
                          'different from the created encryption_type')
 
         # Delete encryption type
-        self.client.delete_encryption_type(
+        self.volume_types_client.delete_encryption_type(
             encryption_type['volume_type_id'])
         resource = {"id": encryption_type['volume_type_id'],
                     "type": "encryption-type"}
-        self.client.wait_for_resource_deletion(resource)
-        _, deleted_encryption_type = self.client.get_encryption_type(
-            encryption_type['volume_type_id'])
+        self.volume_types_client.wait_for_resource_deletion(resource)
+        _, deleted_encryption_type = (
+            self.volume_types_client.get_encryption_type(
+                encryption_type['volume_type_id']))
         self.assertEmpty(deleted_encryption_type)
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs.py b/tempest/api/volume/admin/test_volume_types_extra_specs.py
index 2d72dd2..a154821 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs.py
@@ -25,22 +25,23 @@
     def resource_setup(cls):
         super(VolumeTypesExtraSpecsTest, cls).resource_setup()
         vol_type_name = data_utils.rand_name('Volume-type-')
-        _, cls.volume_type = cls.client.create_volume_type(vol_type_name)
+        _, cls.volume_type = cls.volume_types_client.create_volume_type(
+            vol_type_name)
 
     @classmethod
     def resource_cleanup(cls):
-        cls.client.delete_volume_type(cls.volume_type['id'])
+        cls.volume_types_client.delete_volume_type(cls.volume_type['id'])
         super(VolumeTypesExtraSpecsTest, cls).resource_cleanup()
 
     @test.attr(type='smoke')
     def test_volume_type_extra_specs_list(self):
         # List Volume types extra specs.
         extra_specs = {"spec1": "val1"}
-        _, body = self.client.create_volume_type_extra_specs(
+        _, body = self.volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'], extra_specs)
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly created")
-        _, body = self.client.list_volume_types_extra_specs(
+        _, body = self.volume_types_client.list_volume_types_extra_specs(
             self.volume_type['id'])
         self.assertIsInstance(body, dict)
         self.assertIn('spec1', body)
@@ -49,13 +50,13 @@
     def test_volume_type_extra_specs_update(self):
         # Update volume type extra specs
         extra_specs = {"spec2": "val1"}
-        _, body = self.client.create_volume_type_extra_specs(
+        _, body = self.volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'], extra_specs)
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly created")
 
         extra_spec = {"spec2": "val2"}
-        _, body = self.client.update_volume_type_extra_specs(
+        _, body = self.volume_types_client.update_volume_type_extra_specs(
             self.volume_type['id'],
             extra_spec.keys()[0],
             extra_spec)
@@ -67,18 +68,18 @@
     def test_volume_type_extra_spec_create_get_delete(self):
         # Create/Get/Delete volume type extra spec.
         extra_specs = {"spec3": "val1"}
-        _, body = self.client.create_volume_type_extra_specs(
+        _, body = self.volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'],
             extra_specs)
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly created")
 
-        self.client.get_volume_type_extra_specs(
+        self.volume_types_client.get_volume_type_extra_specs(
             self.volume_type['id'],
             extra_specs.keys()[0])
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly fetched")
 
-        self.client.delete_volume_type_extra_specs(
+        self.volume_types_client.delete_volume_type_extra_specs(
             self.volume_type['id'],
             extra_specs.keys()[0])
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
index f3eee00..8734b16 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
@@ -29,104 +29,115 @@
         super(ExtraSpecsNegativeTest, cls).resource_setup()
         vol_type_name = data_utils.rand_name('Volume-type-')
         cls.extra_specs = {"spec1": "val1"}
-        _, cls.volume_type = cls.client.create_volume_type(
+        _, cls.volume_type = cls.volume_types_client.create_volume_type(
             vol_type_name,
             extra_specs=cls.extra_specs)
 
     @classmethod
     def resource_cleanup(cls):
-        cls.client.delete_volume_type(cls.volume_type['id'])
+        cls.volume_types_client.delete_volume_type(cls.volume_type['id'])
         super(ExtraSpecsNegativeTest, cls).resource_cleanup()
 
     @test.attr(type='gate')
     def test_update_no_body(self):
         # Should not update volume type extra specs with no body
         extra_spec = {"spec1": "val2"}
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.update_volume_type_extra_specs,
-                          self.volume_type['id'], extra_spec.keys()[0], None)
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.update_volume_type_extra_specs,
+            self.volume_type['id'], extra_spec.keys()[0], None)
 
     @test.attr(type='gate')
     def test_update_nonexistent_extra_spec_id(self):
         # Should not update volume type extra specs with nonexistent id.
         extra_spec = {"spec1": "val2"}
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.update_volume_type_extra_specs,
-                          self.volume_type['id'], str(uuid.uuid4()),
-                          extra_spec)
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.update_volume_type_extra_specs,
+            self.volume_type['id'], str(uuid.uuid4()),
+            extra_spec)
 
     @test.attr(type='gate')
     def test_update_none_extra_spec_id(self):
         # Should not update volume type extra specs with none id.
         extra_spec = {"spec1": "val2"}
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.update_volume_type_extra_specs,
-                          self.volume_type['id'], None, extra_spec)
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.update_volume_type_extra_specs,
+            self.volume_type['id'], None, extra_spec)
 
     @test.attr(type='gate')
     def test_update_multiple_extra_spec(self):
         # Should not update volume type extra specs with multiple specs as
             # body.
         extra_spec = {"spec1": "val2", 'spec2': 'val1'}
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.update_volume_type_extra_specs,
-                          self.volume_type['id'], extra_spec.keys()[0],
-                          extra_spec)
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.update_volume_type_extra_specs,
+            self.volume_type['id'], extra_spec.keys()[0],
+            extra_spec)
 
     @test.attr(type='gate')
     def test_create_nonexistent_type_id(self):
         # Should not create volume type extra spec for nonexistent volume
             # type id.
         extra_specs = {"spec2": "val1"}
-        self.assertRaises(exceptions.NotFound,
-                          self.client.create_volume_type_extra_specs,
-                          str(uuid.uuid4()), extra_specs)
+        self.assertRaises(
+            exceptions.NotFound,
+            self.volume_types_client.create_volume_type_extra_specs,
+            str(uuid.uuid4()), extra_specs)
 
     @test.attr(type='gate')
     def test_create_none_body(self):
         # Should not create volume type extra spec for none POST body.
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.create_volume_type_extra_specs,
-                          self.volume_type['id'], None)
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.create_volume_type_extra_specs,
+            self.volume_type['id'], None)
 
     @test.attr(type='gate')
     def test_create_invalid_body(self):
         # Should not create volume type extra spec for invalid POST body.
-        self.assertRaises(exceptions.BadRequest,
-                          self.client.create_volume_type_extra_specs,
-                          self.volume_type['id'], ['invalid'])
+        self.assertRaises(
+            exceptions.BadRequest,
+            self.volume_types_client.create_volume_type_extra_specs,
+            self.volume_type['id'], ['invalid'])
 
     @test.attr(type='gate')
     def test_delete_nonexistent_volume_type_id(self):
         # Should not delete volume type extra spec for nonexistent
             # type id.
         extra_specs = {"spec1": "val1"}
-        self.assertRaises(exceptions.NotFound,
-                          self.client.delete_volume_type_extra_specs,
-                          str(uuid.uuid4()), extra_specs.keys()[0])
+        self.assertRaises(
+            exceptions.NotFound,
+            self.volume_types_client.delete_volume_type_extra_specs,
+            str(uuid.uuid4()), extra_specs.keys()[0])
 
     @test.attr(type='gate')
     def test_list_nonexistent_volume_type_id(self):
         # Should not list volume type extra spec for nonexistent type id.
-        self.assertRaises(exceptions.NotFound,
-                          self.client.list_volume_types_extra_specs,
-                          str(uuid.uuid4()))
+        self.assertRaises(
+            exceptions.NotFound,
+            self.volume_types_client.list_volume_types_extra_specs,
+            str(uuid.uuid4()))
 
     @test.attr(type='gate')
     def test_get_nonexistent_volume_type_id(self):
         # Should not get volume type extra spec for nonexistent type id.
         extra_specs = {"spec1": "val1"}
-        self.assertRaises(exceptions.NotFound,
-                          self.client.get_volume_type_extra_specs,
-                          str(uuid.uuid4()), extra_specs.keys()[0])
+        self.assertRaises(
+            exceptions.NotFound,
+            self.volume_types_client.get_volume_type_extra_specs,
+            str(uuid.uuid4()), extra_specs.keys()[0])
 
     @test.attr(type='gate')
     def test_get_nonexistent_extra_spec_id(self):
         # Should not get volume type extra spec for nonexistent extra spec
             # id.
-        self.assertRaises(exceptions.NotFound,
-                          self.client.get_volume_type_extra_specs,
-                          self.volume_type['id'], str(uuid.uuid4()))
+        self.assertRaises(
+            exceptions.NotFound,
+            self.volume_types_client.get_volume_type_extra_specs,
+            self.volume_type['id'], str(uuid.uuid4()))
 
 
 class ExtraSpecsNegativeTestXML(ExtraSpecsNegativeTest):
diff --git a/tempest/api/volume/admin/test_volume_types_negative.py b/tempest/api/volume/admin/test_volume_types_negative.py
index c18e15d..a4d6431 100644
--- a/tempest/api/volume/admin/test_volume_types_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_negative.py
@@ -35,18 +35,20 @@
     def test_create_with_empty_name(self):
         # Should not be able to create volume type with an empty name.
         self.assertRaises(exceptions.BadRequest,
-                          self.client.create_volume_type, '')
+                          self.volume_types_client.create_volume_type, '')
 
     @test.attr(type='gate')
     def test_get_nonexistent_type_id(self):
         # Should not be able to get volume type with nonexistent type id.
-        self.assertRaises(exceptions.NotFound, self.client.get_volume_type,
+        self.assertRaises(exceptions.NotFound,
+                          self.volume_types_client.get_volume_type,
                           str(uuid.uuid4()))
 
     @test.attr(type='gate')
     def test_delete_nonexistent_type_id(self):
         # Should not be able to delete volume type with nonexistent type id.
-        self.assertRaises(exceptions.NotFound, self.client.delete_volume_type,
+        self.assertRaises(exceptions.NotFound,
+                          self.volume_types_client.delete_volume_type,
                           str(uuid.uuid4()))
 
 
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index 7f5361d..1d5e77b 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -170,7 +170,6 @@
 
         cls.qos_specs = []
 
-        cls.client = cls.os_adm.volume_types_client
         cls.hosts_client = cls.os_adm.volume_hosts_client
         cls.quotas_client = cls.os_adm.volume_quotas_client
         cls.volume_types_client = cls.os_adm.volume_types_client